noaa-coral-6089 Rarotonga - Subseasonal Coral d18O and Sr/Ca Data Linsley, B.K.; Kaplan, A.; Gouriou, Y.; Salinger, J.; deMenocal, P.B.; Wellington, G.M.; Howe, S.S. Rarotonga - Subseasonal Coral d18O and Sr/Ca Data 2008-03-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/6089 Investigator B.K. Linsley Investigator A. Kaplan Investigator Y. Gouriou Investigator J. Salinger Investigator P.B. deMenocal Investigator G.M. Wellington Investigator S.S. Howe earth science paleoclimate corals and sclerosponges strontium/calcium,Porites lutea,null,millimole per mole,null,corals and sclerosponges,interpolated,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate corals and sclerosponges age,null,null,year Common Era,null,corals and sclerosponges,null,null,N,null earth science paleoclimate corals and sclerosponges delta 13C,Porites lutea,null,per mil VPDB,null,corals and sclerosponges,interpolated,isotope ratio mass spectrometry,N,null earth science paleoclimate corals and sclerosponges delta 18O,Porites lutea,null,per mil VPDB,null,corals and sclerosponges,interpolated,isotope ratio mass spectrometry,N,null earth science paleoclimate corals and sclerosponges delta 18O,Porites lutea,null,per mil VPDB,annual,corals and sclerosponges,averaged,isotope ratio mass spectrometry,N,null earth science paleoclimate corals and sclerosponges delta 13C,Porites lutea,null,per mil VPDB,annual,corals and sclerosponges,averaged,isotope ratio mass spectrometry,N,null earth science paleoclimate corals and sclerosponges oxygen isotopes earth science paleoclimate corals and sclerosponges trace metals geoscientificInformation PAGES 2k Network PAGES Australasia 2k 1726 AD 2000 AD 224 cal yr BP -50 cal yr BP Complete -21.23 -21.23 -159.82 -159.82 -18 -18 Ocean Pacific Ocean South Pacific Ocean Polynesia Cook Islands Rarotonga>LATITUDE -21.23>LONGITUDE -159.82 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Linsley, B.K., A. Kaplan, Y. Gouriou, J. Salinger, P.B. deMenocal, G.M. Wellington, and S.S. Howe 2006 Geochemistry, Geophysics, Geosystems 7 Q05003 10.1029/2005GC001115 Linsley, B.K., G.M. Wellington, D.P. Schrag, L. Ren, M.J. Salinger, and A.W. Tudhope 2004 Climate Dynamics 22 1-11 10.1007/s00382-003-0364-y Ren, L.; Linsley, B. K.; Wellington, G. M.; Schrag, D. P.; Hoegh-Guldberg, O 2003 Geochimica et Cosmochimica Acta 67

The South Pacific Convergence Zone (SPCZ) is the largest and most persistent spur of the Intertropical Convergence Zone. At the southeastern edge of the SPCZ near 170W and 15 20S a surface ocean salinity frontal zone exists that separates fresher Western Pacific Warm Pool water from saltier and cooler waters in the east. This salinity front is known to shift east and west with the phase of the El NinËœo Southern Oscillation. We have generated subannually resolved and replicated coral oxygen isotopic time series from Fiji (17S, 179E) and Rarotonga (21.5S, 160W) that have recorded interannual displacements of the salinity front over the last 380 years and also indicate that at lower frequencies the decadal mean position of the salinity front, and eastern extent of the SPCZ, has shifted east-west through 10 to 20 of longitude three times during this interval. The most recent and largest shift began in the mid 1800s as the salinity front progressively moved eastward and salinity decreased at both sites. Our results suggest that sea surface salinity at these sites is now at the lowest levels recorded and is evidence for an unprecedented expansion of the SPCZ since the mid 1800s. The expansion of the SPCZ implies a gradual change in the South Pacific to more La Nina-like long-term mean conditions. This observation is consistent with the ocean thermostat mechanism for the Pacific coupled ocean-atmosphere system, whereby exogenous heating of the atmosphere would result in greater warming in the western Pacific and a greater east-west surface temperature gradient.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/east_pacific/linsley2006-99-ann_noaa.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/east_pacific/linsley2006-2r-d18o_noaa.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/east_pacific/linsley2006-3r-ann_noaa.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/east_pacific/linsley2006-99_noaa.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/east_pacific/linsley2006-2r-srca_noaa.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/east_pacific/linsley2006-3r_noaa.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11