Caroline Island#Time zone realignment

{{Infobox islands

| name = Caroline Island

| image = CarolinePic-Kepler-South.jpg

| image_alt = Tropical shoreline with coconut palm trees

| image_caption = Lagoon-facing beach on South Islet

| label = Caroline Island

| map = Pacific Ocean#Kiribati

| pushpin_map_width = 220

| coordinates = {{coord|09|57|18|S|150|12|45|W|type:isle|display=inline,title}}

| location = Pacific Ocean

| country = Kiribati

| archipelago = Line Islands

| area_ha = 699

| elevation_m = 6

| total_islands = approximately 39 islets

| population = uninhabited

}}

Caroline Island (also known as Caroline Atoll or Millennium Island) is the easternmost of several uninhabited coral atolls comprising the southern Line Islands in the central Pacific Ocean nation of Kiribati.

The atoll was first sighted by Europeans in 1606 and was claimed by the United Kingdom of Great Britain and Ireland in 1868. It has been part of the Republic of Kiribati since the island nation's independence in 1979. Caroline Island has remained relatively untouched and is one of the world's most pristine tropical islands, despite guano mining, copra (coconut meat) harvesting, and human habitation in the 19th and 20th centuries. It is home to one of the world's largest populations of the coconut crab and is an important breeding site for seabirds, most notably the sooty tern.

The atoll is known as the first place on Earth to see sunrise each day during much of the year, and for its role in the millennium celebrations of 2000. A 1995 realignment of the International Date Line made Caroline Island the first point of land on Earth to reach 1 January 2000 on the calendar.

History

=Prehistory=

The atolls (ring-shaped coral reefs) of the Pacific Ocean are the most marginal environment in the world for human habitation.{{sfn|Dickinson|2009|p=4}} They have generally not been occupied for more than 1,500 years,{{sfn|Dickinson|2009|p=7}} but started to be settled by humans once permanent islets formed around lagoons.{{sfn|Dickinson|2009|p=4}} In comparison with other atolls, Caroline Island has been relatively undisturbed.{{sfn|Barott|Caselle|Dinsdale|Friedlander|2010|p=1}}

There are indications that early Polynesians reached the island before Europeans, as several marae (communal or sacred places) and graves have been discovered, but no evidence has been found of long-term settlement.{{sfn|Barott|Caselle|Dinsdale|Friedlander|2010|p=1}} Evidence of the largest of the marae, located on the west side of Nake Islet, was documented in 1883.{{sfn|Bryan|1942|p=125}}

=Early sightings and accounts=

Ferdinand Magellan may have sighted Caroline Island on 4 February 1521.{{cite news |last1=Raymont |first1=Henry |title=Morison Rates Magellan Above Columbus as a Seaman |url=https://www.nytimes.com/1972/04/24/archives/morison-rates-magellan-above-columbus-as-a-seaman.html?mcubz=1 |work=The New York Times |date=24 April 1972 |page=2 |archivedate=30 July 2017 |archiveurl=https://web.archive.org/web/20170730224818/http://www.nytimes.com/1972/04/24/archives/morison-rates-magellan-above-columbus-as-a-seaman.html?mcubz=1 |url-status=live }} The first recorded sighting of Caroline Island by Europeans was on 21 February 1606, by the Portuguese explorer Pedro Fernández de Quirós, who named the island San Bernardo, and who wrote an account of his voyage.{{sfn|Kepler|Kepler|1994|p=6}} The island was next seen by Europeans on 16 December 1795, when the British naval officer William Robert Broughton of {{HMS|Providence|1791|6}} named it Carolina, after the daughter of Philip Stephens, the First Secretary of the Admiralty.{{sfn|Stackpole|1972|p=353}} The island was sighted in 1821 by the English whaler Supply, and was then named "Thornton Island" for the ship's captain.{{sfn|Stackpole|1972|p=353}}{{sfn|Findlay|1884|p=993}} It was also recorded in the 19th century as Hirst Island{{sfn|Panton|2015|p=119}} and Clark Island.{{sfn|Bryan|1942|p=125}}

Other early visits which left behind accounts of the island include that of the USS Dolphin in 1825, written by the United States Navy officer Hiram Paulding. According to this account, the crew of the Dolphin supplied themselves with fish from the island, although when wading back to their ship they were attacked by sharks.{{sfn|Paulding|1831|pp=72{{ndash}}75}}

The English whaling ship Tuscan reached Caroline island in 1835,{{sfn|Bennett|1840|pp=1, 365}} and the geography and wildlife of the island were recorded by the ship's surgeon, the biologist Frederick Debell Bennett, in his Narrative of a Whaling Voyage Round the Globe From the Year 1833{{ndash}}1836.{{sfn|Bennett|1840|pp=365–78}} Bennett knew that the island was seldom visited, "although it is usually 'sighted' by South-Seamen, when on their way from the Society Islands to the North Pacific". He noted that about seven years before the arrival of the Tuscan, a Captain Stavers had landed on the island and left behind some pigs, of which no trace remained.{{sfn|Bennett|1840|p=369}}

=1883 solar eclipse=

{{multiple image

| total_width = 380

| direction = horizontal

| image1 = The expedition camp at Caroline Island, May 1883.png

| alt1 = drawing of the camp on Caroline Island in 1883

| caption1 = The astronomers' camp on Caroline Island, drawn by a member of the expedition

| image2 = Photograph of totality as seen at Caroline Island (1883).jpg

| alt2 = photograph of 1883 eclipse

| caption2 = A photograph of the eclipse, taken on the island

}}

In 1883 two expeditions arrived on Caroline Island in time to observe and record the solar eclipse of 6 May. On 22 March, American and English astronomers left the Peruvian port of Callao aboard the {{USS|Hartford|1858|6}}, arriving at the island on 20 April.{{sfn|Upton|1883}} Among those in the American expedition were the astronomers Edward S. Holden of the Washburn Observatory, the expedition's leader,{{sfn|Royal Astronomical Society|1884|p=180}} and Winslow Upton, professor of astronomy at Brown University.{{Cite Appletons'|wstitle=Upton, Winslow|year=1900}}{{cite web |last1=Upton |first1=Winslow |author1-link=Winslow Upton |title=The Solar eclipse of May 6, 1883 |url=http://adsabs.harvard.edu/pdf/1883SidM....2..141U |publisher=SAO/NASA Astrophysics Data System (ADS) |accessdate=24 February 2021 |archivedate=2 September 2022 |archiveurl=https://web.archive.org/web/20220902035324/https://adsabs.harvard.edu/pdf/1883SidM....2..141U |url-status=live }} An expedition from France arrived two days later in the L'Eclaireur.{{sfn|Upton|1883}}

As small boats could not come close to the shore, the equipment was carried to the island by men standing in about {{convert|2|ft|m|1}} of water, and then about {{convert|500|yd|m}} further to the observation site. On the morning of 6 May, the sky cleared shortly before the time of first contact, and remained clear for the rest of the day. During the eclipse, the astronomers searched for Vulcan, a hypothetical intra-Mercurial planet, but discovered nothing. The duration of totality (the time the entire disc of the Sun is obscured) was 5 minutes 25 seconds,{{sfn|Upton|1883}} a little less than the maximum duration of 5 minutes 58 seconds.{{cite web |last1=Espenak |first1=Fred |last2=Meeus |first2=Jean |title=Five Millennium Catalog of Solar Eclipses: -1999 to +3000 (2000 BCE to 3000CE) |url=https://eclipse.gsfc.nasa.gov/5MCSE/5MKSEcatalog.txt |publisher=NASA |date=7 October 2008 |archivedate=18 March 2021 |archiveurl=https://web.archive.org/web/20210318005655/https://eclipse.gsfc.nasa.gov/5MCSE/5MKSEcatalog.txt |url-status=live }} The Austrian astronomer Johann Palisa, a member of the French expedition, discovered an asteroid later that year, which he named Carolina after the island.{{sfn|Schmadel|2000|p=34}}

=Commercial enterprises and British claim=

In 1846, the Tahitian firm of Collie and Lucett attempted to establish a small stock-raising and copra-harvesting community on the island; the operation met with limited financial success.{{sfn|Clapp|Sibley|1971|p=2}} In 1868, Caroline was claimed for Britain by the captain of HMS Reindeer, which noted 27 residents in a settlement on South Islet. The island was leased by the British government to Houlder Brothers and Co. in 1872, with John T. Arundel as the manager; two of the islets are named for him. Houlder Brothers and Co. conducted minimal guano mining on the island from 1874. John T. Arundel and Co. took over the lease and the industry in 1881; the company supplied a total of about 10,000 tons of phosphate until supplies became exhausted in 1895.{{sfn|Bryan|1942|p=125}}{{sfn|Kepler|Kepler|1994|p=9}} In 1885 Arundel established a coconut plantation, but the coconut palms suffered from disease and the plantation failed. The settlement on the island lasted until 1904, when the six remaining Polynesians were relocated to Niue.{{sfn|Kepler|Kepler|1994|p=10}}

File:Millennium Island, Kiribati.jpg

The island was leased to S.R. Maxwell and Company and a new settlement was established in 1916, this time built entirely upon copra export. Much of the South islet was deforested to make way for coconut palms, a non-indigenous plant.{{sfn|Kepler|Kepler|1994|pp=10{{ndash}}11}} The business venture, however, went into debt, and the island's settlement slowly decreased in population.{{sfn|Kepler|Kepler|1994|p=11}} By 1926, it was down to only ten residents, and by 1936, the settlement consisted of only two Tahitian families. It was abandoned in the late 1930s.{{sfn|Bryan|1942|p=126}}

During World War II, Caroline Island remained unoccupied, and no military action took place there.{{sfn|Rottman|2002|p=xx}} Under British jurisdiction, it was formally repossessed by the British Western Pacific High Commission in 1943 and then governed as part of the Central and Southern Line Islands.{{sfn|Kepler|Kepler|1994|p=11}} A Tahitian family was found to be living on the atoll when the American sailor John Caldwell visited it in September 1946.{{sfn|Caldwell|1991|p=153}} In January 1972, the Central and Southern Line Islands were joined with the British colony of the Gilbert and Ellice Islands,{{cite web |title=Kiribati Bill |url=https://api.parliament.uk/historic-hansard/lords/1979/feb/19/kiribati-bill-hl |website=Hansard |publisher=UK Parliament |date=19 February 1979 |archivedate=31 December 2019 |archiveurl=https://web.archive.org/web/20191231162449/https://api.parliament.uk/historic-hansard/lords/1979/feb/19/kiribati-bill-hl |url-status=live }} which had become autonomous in 1971.{{sfn|Whincup|1979|p=15}}

=Kiribati=

When the Gilbert Islands became the independent nation of Kiribati in 1979, Caroline Island became Kiribati's easternmost point.{{cite web |title=A Guide to the United States' History of Recognition, Diplomatic, and Consular Relations, by Country, since 1776: Kiribati |url=https://history.state.gov/countries/kiribati |publisher=United States Department of State |accessdate=26 February 2021 |archivedate=21 March 2021 |archiveurl=https://web.archive.org/web/20210321160955/https://history.state.gov/countries/kiribati |url-status=live }}{{sfn|Kepler|Kepler|1994|p=1}} The island is owned by the government of the Republic of Kiribati and overseen by the Ministry of Line and Phoenix Islands Development, which is headquartered on Kiritimati.{{sfn|Kepler|Kepler|1994|p=1}}{{cite web |title=Ministry of the Line and Phoenix Islands |url=https://www.commonwealthofnations.org/organisations/ministry_of_the_line_and_phoenix_islands/ |website=Commonwealth Network |publisher=Nexus Partnerships Limited |accessdate=26 February 2021 |date=2020 |archivedate=15 August 2020 |archiveurl=https://web.archive.org/web/20200815112750/http://www.commonwealthofnations.org/organisations/ministry_of_the_line_and_phoenix_islands/ |url-status=live }} Claims to sovereignty over the island by the United States were relinquished in the 1979 Treaty of Tarawa, ratified by the U.S. Senate in 1983.{{cite web |title=Treaty of Friendship between the United States of America and the Republic of Kiribati |url=https://www.ecolex.org/details/treaty/treaty-of-friendship-between-the-united-states-of-america-and-the-republic-of-kiribati-tre-151041/ |publisher=Ecolex |accessdate=26 February 2021 |archivedate=11 July 2021 |archiveurl=https://web.archive.org/web/20210711022440/https://www.ecolex.org/details/treaty/treaty-of-friendship-between-the-united-states-of-america-and-the-republic-of-kiribati-tre-151041/ |url-status=live }}{{cite web |title=Formerly Disputed Islands |url=http://www.doi.gov/oia/Islandpages/disputedpage.htm |publisher=United States Office of Insular Affairs |accessdate=26 February 2021 |date=2007|archiveurl=https://web.archive.org/web/20070930014736/http://www.doi.gov/oia/Islandpages/disputedpage.htm |archivedate=30 September 2007 }}

The island was inhabited from 1987 to 1991 by Anne and Ron Falconer and their children, who developed a largely self-sufficient settlement.{{sfn|Kepler |Kepler|1994|p=12}} Following a transfer of ownership, the Falconers left the island.{{cite web |title=Deportation fiasco stops environmentalist emigration |url=https://www.rnz.co.nz/national/programmes/voices/audio/2018727720/deportation-fiasco-stops-environmentalist-emigration |publisher=Radio New Zealand |date=27 January 2020 |archivedate=15 April 2021 |archiveurl=https://web.archive.org/web/20210415230739/https://www.rnz.co.nz/national/programmes/voices/audio/2018727720/deportation-fiasco-stops-environmentalist-emigration |url-status=live }} In the 1990s, the island was occasionally visited by Polynesian copra gatherers under agreements with the Kiribati government in Tarawa.{{sfn|Scott|1993|p=22}}

On 23 December 1994, the Republic of Kiribati announced a change of time zone for the Line Islands would take effect on 31 December 1994.{{cite web |title=Answers to all your questions about The Start of The New Millennium |url=https://www.oarval.org/new_mill.htm |publisher=Royal Greenwich Observatory |accessdate=26 February 2021 |archivedate=12 February 2022 |date=2014 |archiveurl=https://web.archive.org/web/20220212075228/http://oarval.org/new_mill.htm |url-status=live }} This adjustment placed all of Kiribati on the Asian or western side of the International Date Line.{{sfn|Harris|1999|p=20}} Although Caroline Island's longitudinal position of 150 degrees west corresponded to a UTC offset of −10 hours, the island's new time zone became UTC+14.{{sfn|Vallado|2001|p=186}} This move made Caroline Island both the easternmost land in the earliest time zone (by some definitions, the easternmost point on Earth),{{sfn|Harris|1999|p=20}} and the first point of land which would see sunrise on 1 January 2000—at 5:43 a.m. local time.{{cite news |title=Fireworks ring in new millennium |url=https://www.tribuneindia.com/2000/20000101/world.htm#5 |work=The Tribune |date=1 January 2000 |archivedate=13 December 2013 |archiveurl=https://web.archive.org/web/20131213091044/http://www.tribuneindia.com/2000/20000101/world.htm#5 |url-status=live }} Other Pacific nations, including Tonga, New Zealand and Fiji, protested the move, objecting that it infringed on their claims to be the first land to see dawn in the year 2000.{{cite news |last1=Kristof |first1=Nicholas D. |title=In Pacific Race to Usher In Millennium, a Date-Line Jog |url=https://www.nytimes.com/1997/03/23/world/in-pacific-race-to-usher-in-millennium-a-date-line-jog.html |date=23 March 1997 |page=8 |work=The New York Times |archivedate=21 April 2021 |archiveurl=https://web.archive.org/web/20210421091133/https://www.nytimes.com/1997/03/23/world/in-pacific-race-to-usher-in-millennium-a-date-line-jog.html |url-status=live }} According to the United States Naval Observatory, the first point of land to see sunrise on 1 January 2000 (local time) was between the Dibble Glacier and Victor Bay in East Antarctica, at 66 degrees south, where the sun rose at 12:08 a.m.{{cite news |title=First Sunrise of the Year 2000 |url=https://antarcticsun.usap.gov/pastIssues/1999-2000/1999_12_26.pdf |work=The Antarctic Sun |date=26 December 1999 |page=3 |archivedate=2 January 2017 |archiveurl=https://web.archive.org/web/20170102185258/https://antarcticsun.usap.gov/pastIssues/1999-2000/1999_12_26.pdf |url-status=live }}

In August 1997, to promote events to mark the arrival of the year 2000, Caroline Island was renamed Millennium Island by the Kiribati government.{{cite news |title=Millennium island claim |url=https://www.irishtimes.com/news/millennium-island-claim-1.96137|newspaper=The Irish Times |agency=Associated Press |date=12 August 1997 |archivedate=2 September 2022 |archiveurl=https://web.archive.org/web/20220902035326/https://www.irishtimes.com/news/millennium-island-claim-1.96137 |url-status=live }} In December 1999, over 70 Kiribati singers and dancers travelled to Caroline from South Tarawa, accompanied by approximately 25 journalists, as part of the celebrations to mark the arrival of the new millennium.{{cite news |title=Kiribati: Millennium Celebrations: Midnight |url=http://www.aparchive.com/metadata/KIRIBATI-MILLENNIUM-CELEBRATIONS-MIDNIGHT-1-/201beb5b320d93dc8bdb2dcbae7fcbcb |publisher=Associated Press |date=31 December 1999 |archivedate=2 September 2022 |archiveurl=https://web.archive.org/web/20220902035316/http://www.aparchive.com/metadata/KIRIBATI-MILLENNIUM-CELEBRATIONS-MIDNIGHT-1-/201beb5b320d93dc8bdb2dcbae7fcbcb |url-status=live }}

In 2017 a Russian businessman proposed a deal to invest $350 million to build a resort in Kiribati in exchange for sovereign rights over three islands. The deal was rejected by the Kiribati government based on a report from the Kiribati Foreign Investment Commission.{{cite web|url=https://www.bbc.com/news/blogs-news-from-elsewhere-39101849|title=Kiribati rejects Russian's 'Romanov revival' plan|publisher=BBC|date=27 February 2017|archivedate=8 August 2019|archiveurl=https://web.archive.org/web/20190808175706/https://www.bbc.com/news/blogs-news-from-elsewhere-39101849|url-status=live}}

Geography and climate

Caroline Island lies near the southeastern end of the Line Islands, a string of atolls and islands extending across the equator, {{convert|2400|-|3300|km|mi|abbr=on}} south of the Hawaiian Islands in the central Pacific Ocean.{{cite web |title=Southern Line Islands |url=https://www.nationalgeographic.org/projects/pristine-seas/expeditions/southern-line-islands/#:~:text=South%20of%20the%20Equator%E2%80%94called,3%2C300%20kilometers%20south%20of%20Hawaii |website=National Geographic |accessdate=18 February 2021 |date=2009 |archivedate=31 December 2020 |archiveurl=https://web.archive.org/web/20201231070254/https://www.nationalgeographic.org/projects/pristine-seas/expeditions/southern-line-islands/#:~:text=South%20of%20the%20Equator%E2%80%94called,3%2C300%20kilometers%20south%20of%20Hawaii |url-status=dead }} The slightly crescent-shaped atoll has a land area of {{convert|699|ha|mi2}}.{{cite web |title=Millennium (Caroline) island |url=http://datazone.birdlife.org/site/factsheet/millenium-(caroline)-island-iba-kiribati/map |website=Data Zone |publisher=Birdlife International |accessdate=18 February 2021 |date=2021 |archivedate=2 September 2022 |archiveurl=https://web.archive.org/web/20220902035317/http://datazone.birdlife.org/site/factsheet/millenium-%28caroline%29-island-iba-kiribati/map |url-status=live }} It consists of approximately 39 separate islets,{{sfn|Barott|Caselle|Dinsdale|Friedlander|2010|p=1}} surrounding a narrow lagoon; the smallest islet, Motu Atibu, may have disappeared.{{sfn||Kepler|Kepler|1994|p=133}} The islets—which rise to a height of {{convert|6|m|ft|abbr=on}} above sea level{{cite web |title=Millennium Island, Kiribati |url=https://earthobservatory.nasa.gov/images/39286/millennium-island-kiribati |publisher=NASA |date=1 July 2009 |archivedate=2 June 2020 |archiveurl=https://web.archive.org/web/20200602202000/https://earthobservatory.nasa.gov/images/39286/millennium-island-kiribati |url-status=live }}—share a common geologic origin, and consist of sand deposits and limestone rock set atop a coral reef.{{cite web |title=Atoll |url=https://education.nationalgeographic.org/resource/atoll/ |website=National Geographic |date=28 August 2012|archivedate=18 February 2021 |archiveurl=https://web.archive.org/web/20210218230555/https://www.nationalgeographic.org/encyclopedia/atoll/#:~:text=An%20atoll%20is%20a%20ring,the%20open%20ocean%20or%20sea |url-status=live }} According to the path of the International Date Line, the atoll is the easternmost point of land on Earth.{{sfn|Duka|2007|p=21}}

File:Map of Millennium Island (Caroline Atoll), Kiribati.svg

Three islets make up the bulk of Caroline's land area: Nake Islet ({{convert|91.7|ha|km2|sigfig=3}}) at the north,{{sfn||Kepler|Kepler|1994|pages=120–21}} Long Islet ({{convert|76.0|ha|km2|sigfig=3}}) at the northeast of the lagoon,{{sfn|Kepler|Kepler|1994|pages=123–24}} and South Islet ({{convert|104.4|ha|km2|sigfig=3}}) at the southern end.{{sfn|Kepler|Kepler|1994|pages=143–44}} The other islets, most of which were named during a 1988 ecological survey conducted by the naturalists Cameron and Angela Kepler,{{sfn|Kepler|Kepler|Ellis|1992|pages=9{{ndash}}10}} fall into four groups: the South Nake Islets, the Central Leeward Islets, the Southern Leeward Islets, and the Windward Islets.{{sfn|Kepler|Kepler|1994|p=119}} The island is vulnerable to erosion by spring tides, storms, and strong winds; storms have caused smaller islets to sometimes appear or disappear, and the shapes of larger ones to become altered.{{sfn|Kepler|Kepler|1994|p=69}}

The lagoon, roughly {{convert|6|by|0.5|km|mi|abbr=on}} in size,{{sfn|Barott|Caselle|Dinsdale|Friedlander|2010|p=1}} is shallow—it is at most {{convert|8.8|–|13.7|m|ft|abbr=on}} in depth{{sfn|Barott|Caselle|Dinsdale|Friedlander|2010|p=3}}—and is crossed repeatedly by narrow coral heads and patch reefs. Reef flats generally extend over {{convert|500|m|ft|abbr=on}} from the shore{{sfn|Kepler|Kepler|1994|p=20}}—although some sources report them to extend more than {{convert|1000|m|ft}} from land—and make boat landings perilous except at high tide. There are no natural landings, anchorages, or deep water openings into the lagoon; water that spills into it over shallow channels at high tide is contained within the surrounding reef and remains stable despite ocean tides. Most landings are made at a small break in the reef at the northeast corner of South Islet.{{sfn|Kepler|Kepler|1994|pp=143, 184}}

There is no standing fresh water on Caroline Island,{{sfn|Kepler|Kepler|1994|p=30}} but Nake Islet and South Islet have underground freshwater aquifers and freshwater lenses. The underground water supply on Nake attracted Polynesian settlers, but the first European explorers to reach the atoll searched in vain for drinking water;{{sfn|Kepler|Kepler|1994|pp=120, 143}} wells were built to tap drinking water for later temporary settlements.{{sfn|Kepler|Kepler|1994|p=30}} Little is known about the island's existing freshwater lenses.{{sfn|Kepler|Kepler|1994|p=30}} Soils are of poor quality, dominated by coral gravel and sand, with organic content present only within stable, forested island centers. Guano deposits make island soil, where it does exist, nitrogen-rich.{{sfn|Kepler|Kepler|1994|p=2}}

Like the rest of Kiribati, Caroline Island enjoys a tropical maritime climate which is consistently hot and humid, with air temperatures that relate closely to sea temperature. Across Kiribati average temperatures vary no more than 1 °C from season to season.{{cite web |title=Current climate |url=http://www.climate.gov.ki/current-climate/ |publisher=Kiribati Government |accessdate=22 February 2021 |archivedate=11 March 2021 |archiveurl=https://web.archive.org/web/20210311133236/http://www.climate.gov.ki/current-climate/ |url-status=live }}

File:CarolinePic-Kepler-Long.JPG

There is no weather station located at Caroline.{{cite web |title=Pacific Climate Change Data Portal |url=http://www.bom.gov.au/climate/pccsp/ |publisher=Australian Government Bureau of Meteorology |accessdate=22 February 2021 |date=2021 |archivedate=21 March 2021 |archiveurl=https://web.archive.org/web/20210321042152/http://www.bom.gov.au/climate/pccsp/ |url-status=live }} During 2014 (as of 2021 the last year for which data is publicly available), monthly mean temperatures at South Tarawa, the capital of Kiribati, ranged between {{convert|28.3|and(-)|29.7|C}}, with maximum monthly temperatures ranging from {{convert|31.0|to(-)|32.5|C}} and minimum temperatures ranging from {{convert|25.0|to(-)|26.5|C}}. Caroline Island lies within a region of highly variable precipitation; between 1950 and 2010 the region received an average of {{convert|1700|to|2500|mm|in|abbr=on}} of rain annually.{{cite web |title=Tarawa |url=http://www.bom.gov.au/cgi-bin/climate/pccsp/site_data.cgi?download=%2Fweb01%2Fncc%2Fwww%2Fpccsp%2FKIR_000002_Rain.csv&ts_period=monthly&data_source=raw&variable=Rain&period=annual&s_yr=1926&e_yr=2015&ave_yr=15&unit=A&nat_id=KIR&station=000002 |publisher=Australian Government Bureau of Meteorology |accessdate=22 February 2021 |archivedate=2 September 2022 |archiveurl=https://web.archive.org/web/20220902035318/http://www.bom.gov.au/cgi-bin/climate/pccsp/site_data.cgi?download=%2Fweb01%2Fncc%2Fwww%2Fpccsp%2FKIR_000002_Rain.csv&ts_period=monthly&data_source=raw&variable=Rain&period=annual&s_yr=1926&e_yr=2015&ave_yr=15&unit=A&nat_id=KIR&station=000002 |url-status=live }} Tides are on the order of {{convert|0.5|m|ft|abbr=on}},{{sfn|Barott|Caselle|Dinsdale|Friedlander|2010|p=6}} and trade winds, generally from the northeast, mean that corner of the island experiences the roughest seas.{{sfn|Kepler|Kepler|1994|p=33}}

Caroline Island is among the most remote islands on Earth.{{cite web |title=More Isolated Islands |url=http://islands.unep.ch/Tisolat.htm |website=UN System-Wide Earthwatch Web Site Island Directory Tables |publisher=United Nations Environment Programme|date=18 February 1998 |archivedate=16 March 2012 |archiveurl=https://web.archive.org/web/20120316010338/http://islands.unep.ch/Tisolat.htm |url-status=live }} It is {{convert|230|km|mi|abbr=on}} from the closest land at Flint Island, and {{convert|5100|km|mi|abbr=on}} from the nearest continental land in North America.

Geology

Caroline Atoll is one of over 175 atolls and coral islands in the Pacific Ocean. The English naturalist and geologist Charles Darwin first suggested the theory, still accepted, that atolls originate from calcium carbonate platforms that grow around the cones of extinct, sinking volcanoes. Caroline Atoll's high volcanic island has subsided below sea level; the surrounding coral reef has developed upwards, built by corals, its typically annular shape caused by underwater weathering.{{sfn|Dickinson|2009|pp=4{{ndash}}5}} The coral reef will continue to develop as long as it is not overtaken by rising sea levels, in which case the corals will perish and the atoll will stop growing.{{sfn|Migoń|2014|pp=350–51}}

File:The seabed around Caroline Island and its nearest neighbours.svg]]

The Line Islands chain is made of seamounts and ridges from the Tuamotu Islands in the south to Johnston Atoll in the north;{{sfn|Schlanger|Garcia|Keating|Naughton1984|pp=11,261–62}} which rise from the ocean floor from a depth of {{convert|5000|m|mi}}.{{sfn|Keating|1992|p=77}} Caroline Island is one of 12 seamounts in the chain to rise above sea level.{{sfn|Keating|1992|p=77}}

The igneous rocks of all the Line Islands consist of alkali basalts and hawaiites, and are similar to those found in the Hawaiian Islands.{{sfn|Schlanger|Garcia|Keating|Naughton1984|pp=11,261–70}} Several models have been proposed to explain the formation of the chain's complex geology. In 1972, the American geophysicist W. Jason Morgan postulated that the chain was formed 70 myr ago in parallel with the creation of the Hawaiian Islands, each by means of a single hotspot. Other experts argued against this model, pointing to geometric and paleomagnetic evidence, and the complex timing of the volcanic episodes that created the Line Island chain. In a 1976 paper, Winterer implied that chains of volcanoes were created by a series of individual hotspots.{{sfn|Schlanger|Garcia|Keating|Naughton1984|pp=11,261–62}}

Over the next decade it was discovered that Late Cretaceous and Eocene volcanism had occurred close to Caroline Island, as well as thousands of kilometres to the north, which disproved the single hotspot model for the formation of the Line Islands, and instead suggested the chain was made by a more complex series of volcanic events than the Hawaiian–Emperor seamount chain.{{sfn|Schlanger|Garcia|Keating|Naughton1984|pp=11,261–62}} During the 1980s, scientists put forward new theories to explain the evolution of the chain, including a transform fracture zone theory (since refuted by paleomagnetic data), and a multiple hotspot model{{sfn|Schlanger|Garcia|Keating|Naughton1984|pp=11,271–73}} which is still being discussed as of 2020. A combination of hotspot-transform fracture zone phenomena is also possible.{{sfn|Fletcher|Wyman|Zahirovic|2020|pp=1140–42}}

Flora and fauna

{{multiple image|perrow = 2|total_width=300

| align = right

| image1 = Starr 061129-1724 Heliotropium anomalum var. argenteum.jpg

| alt1 = Photograph of Heliotropium anomalum

| caption1 = Heliotropium anomalum

| image7 = Suriana maritima creeping.jpg

| alt7 = Photograph of Suriana maritima

| caption7 = Suriana maritima

| image6=CarolinePic-Kepler-NorthArundel.jpg

| alt6=Photo of forest

| caption6= Cordia subcordata

| image3=CarolinePic-Kepler-Pig.jpg

| alt3=Photograph of Pisonia grandis

| caption3=Pisonia grandis

| footer = Some of the dominant plant species on Caroline Island}}

Despite more than three centuries of occasional human impact on Caroline Island, it is one of very few remaining near-pristine tropical islands.{{sfn|Kepler|Kepler|1994|p=171}} The United Nations rated the atoll with a 'Human Impact Index' rating of 1 in 1998, making it one of the most unspoiled islands in the world.{{cite web |title=Islands by Human Impact Index |url=http://islands.unep.ch/Tihi.htm |publisher=United Nations Environment Programme |date=18 February 1998 |archivedate=13 July 2006 |archiveurl=https://web.archive.org/web/20060713190953/http://islands.unep.ch/Tihi.htm |url-status=live }} Its undisturbed state has led to a proposal that it be designated a World Heritage Site and a Biosphere Reserve.{{cite web |last1=Watkins |first1=Doug |last2=Batoromaio |first2=Kiritian |title=Directory Of Wetlands Of Kiribati – 2014 |url=https://www.sprep.org/publications/directory-of-wetlands-of-kiribati-2014-0 |website=Report to the Secretariat of the Pacific Regional Environment Program |publisher=Pacific Regional Environment Programme (SPREP) |date=2014 |page=96 |accessdate=22 February 2021 |archivedate=2 September 2022 |archiveurl=https://web.archive.org/web/20220902035324/https://www.sprep.org/publications/directory-of-wetlands-of-kiribati-2014-0 |url-status=live }} Caroline was visited in 1965 by the Pacific Ocean Biological Survey Program, in 1974 by the Line Island Expedition,{{sfn|Kepler|Kepler|1994|p=12}} and in 1988 and 1991 by the United Nations Environment Programme (UNEP) Wildlife Conservation Unit.{{sfn|Scott|1993|p=255}} A 1991 Kiribati Government expedition, comprising personnel of the Wildlife Conservation Unit and officials of the Ministry of Line and Phoenix Islands Development, agreed that with the exception of South Islet, Long Islet, and Nake Islet, the Caroline Atoll islets should become Wildlife Sanctuaries.

In 1988, 90% of Caroline Island had vegetation; two-thirds of the vegetation was woodland, and 89% of the plant species were indigenous. Caroline's islets are made up of seven concentric plant communities, defined by a dominant species. One community—dominated by the coconut palm—was made by humans. The other six are:{{sfn|Kepler|Kepler|1994|p=90}}

an outermost "herb mat", comprising mainly the flowering shrub Heliotropium anomalum and the succulent plant Portulaca lutea;{{sfn|Kepler|Kepler|1994|pp=51, 58 }}
"Beach Shrub" (shrubland), consisting of the evergreen shrub Bay cedar Suriana maritima;{{sfn|Kepler|Kepler|1994|p=93}}
the minor plant community "Pandanus Forest" (consisting primarily of specimens of the Pandanus tectorius tree);{{sfn|Kepler|Kepler|1994|p=49}}
"Tournefortia Scrub and Forest", populated by Heliotropium arboreum, which dominates the wooded islets of the atoll, forming 31% of the atoll's land area;{{sfn|Kepler|Kepler|1994|p=94}}
"Cordia Forest", dominated by the flowering tree Cordia subcordata;{{sfn|Kepler|Kepler|1994|p=56}}
"Pisonia Forest", consisting of the Pisonia grandis tree, located in the interior of the larger islets, and widely distributed throughout the atoll.{{sfn|Kepler|Kepler|1994|p=101}}

File:Cococrb2.jpg, a threatened species that lives on Caroline Island]]

Smaller islets lack the central forest and the smallest islets are vegetated solely by low-lying herbs.{{sfn|Kepler|Kepler|1994|pp=72{{ndash}}73}} Coconut palms were introduced to the atoll after it was first discovered by Europeans,{{sfn|Kepler|Kepler|1994|p=115}} and a large plantation still exists on South Islet, with palms growing to a lesser degree on Long Islet and Nake Islet.{{cite web |last=Teataata |first=Aobure |year=1998 |title=Wetlands |url=http://www.unep-wcmc.org/index.html?http://sea.unep-wcmc.org/sites/wetlands/caroline.htm~main |publisher=United Nations Environment Programme |archiveurl=https://web.archive.org/web/20080210063706/http://sea.unep-wcmc.org/sites/wetlands/caroline.htm |archivedate=10 February 2008 }}

In 2014 the Kiribati government established a fishing exclusion zone extending to 12 nautical miles around each of the southern Line Islands—Caroline, Flint, Vostok, Malden, and Starbuck.{{cite web |last= Warne |first= Kennedy |work= National Geographic |title= A World Apart: The Southern Line Islands |date= September 2014 |url= https://www.nationalgeographic.com/magazine/article/southern-line-islands |accessdate= 15 May 2015 |archivedate= 8 March 2021 |archiveurl= https://web.archive.org/web/20210308163729/http://www.nationalgeographic.com/magazine/article/southern-line-islands |url-status= dead }}

Caroline Island is an important breeding site for several species of seabirds, most notably the sooty tern (Onychoprion fuscata), numbering around 500,000—a colony of sooty terns dominates the eastern islets—and the great frigatebird (Fregata minor), numbering over 10,000, according to estimations made in 1980. Caroline Island and Flint Island host one of the world's largest populations of the coconut crab (Birgus latro). Other native animals include the Tridacna clam, which is abundant in the central lagoon, hermit crabs, and multiple species of lizards.

Giant clam populations reach densities up to four per square foot (43 per m²) in parts of the lagoon. The most common species is the "small giant clam" Tridacna maxima, and the largest clam species, Tridacna gigas, is also found in the lagoon. The lagoon is a nursery habitat for fish species, including important and heavily exploited species such as the blacktip reef shark (Carcharhinus melanopterus) and the endangered Napoleon wrasse (Cheilinus undulatus).{{sfn|Barott|Caselle|Dinsdale|Friedlander|2010|}}

The atoll is designated as a wildlife sanctuary for turtle nesting.{{sfn|Lovell|Kirata|Tekinaiti|2002|p=182}} The endangered green turtle (Chelonia mydas) nests on the beaches of Caroline Island, but there have been reports of poaching by homesteaders.

Human contact has caused the introduction of about twenty non-native species of flora to Caroline Island, including the vine Ipomoea violacea, which has begun to proliferate. Domestic cats and dogs introduced alongside a small homestead have driven the seabird population away from the islet of Motu Ana-Ana.

Environmental issues

Caroline Island is low-lying, with no land greater than {{convert|6|m|ft}} above sea level. Regional sea surface temperatures have risen by around 0.1 °C per decade since the 1950s,{{cite web |last1=Kiribati Government |title=Republic Of Kiribati: Intended Nationally Determined Contribution (INDC) |url=https://www4.unfccc.int/sites/ndcstaging/PublishedDocuments/Kiribati%20First/INDC_KIRIBATI.pdf |publisher=United Nations |accessdate=4 March 2021 |pages=4, 12 |archivedate=21 April 2021 |archiveurl=https://web.archive.org/web/20210421092200/https://www4.unfccc.int/sites/ndcstaging/PublishedDocuments/Kiribati%20First/INDC_KIRIBATI.pdf |url-status=live }} and in 2006, the United Nations rated the island as among those most vulnerable to rising sea levels.{{cite web |title=Islands of Kiribati |url=http://islands.unep.ch/IKQ.htm#Caroline |publisher=United Nations Environment Programme |accessdate=18 February 2021 |date=1998 |archivedate=11 February 2012 |archiveurl=https://web.archive.org/web/20120211113215/http://islands.unep.ch/IKQ.htm#Caroline |url-status=live }} The UNEP reported in 2006 that Caroline could disappear "within the next 30{{ndash}}50 years".{{sfn|Singh|Pathirana|Shi|2006|p=32}}

Caroline Island has recovered from destruction caused by settlers and business opportunists. The island's indigenous plant and animal species are thriving,{{sfn|Barott|Caselle|Dinsdale|Friedlander|2010|pp=1{{ndash}}2}} and it was reported in 2010 that its coral reefs are among the most pristine in the world.{{sfn|Barott|Caselle|Dinsdale|Friedlander|2010|p=1}} The introduced coconut palm is a highly competitive plant which blocks the light and so prevents other species from growing, but is only prevalent on South Islet.{{sfn|Watkins|Batoromaio|2014|p=95}} Wildlife can be adversely affected by the presence of tourists or hunters,{{sfn|Watkins|Batoromaio|2014|p=95}}{{sfn|Thomas|Tonganibeia|2007|p=48}} and since 1979 all animals on the island have been protected under Schedule 2 of Kiribati's Wildlife Conservation Ordinance.{{sfn|Watkins|Batoromaio|2014|p=96}} As of 2014, no governmental management plan or monitoring programme for the island has been produced.{{sfn|Watkins|Batoromaio|2014|p=96}}

Footnotes

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External links

[https://web.archive.org/web/20070611184142/http://www.livingarchipelagos.org/sitepage.asp?name=Millenium%20Atoll Living Archipelagos Profile] for Caroline Island
Caroline Island on [http://legacy.lib.utexas.edu/maps/onc/txu-pclmaps-oclc-8322829_n_20.jpg Operational Navigation Chart ONC N-20] (Line Islands; Iles Des Tuamotu (France); South Pacific Ocean), revised 1986, from the Perry-Castañeda Library Map Collection
[https://tidesandcurrents.noaa.gov/noaatidepredictions.html?id=TPT2821 Tide Predictions for Caroline Island] from the National Oceanic and Atmospheric Administration (NOAA)
[https://coastal.climatecentral.org/map/12/-150.2153/-9.9586/?theme=sea_level_rise&map_type=year&basemap=roadmap&contiguous=true&elevation_model=best_available&forecast_year=2050&pathway=rcp45&percentile=p50&refresh=true&return_level=return_level_1&slr_model=kopp_2014 Risk map for Caroline Island] from the Climate Central organization, showing projected flooding levels due to climate change