noaa-coral-12216 Palau 100 Year Gorgonian and Black Coral Stable Isotope Data Williams, B.; Grottoli, A.G. Palau 100 Year Gorgonian and Black Coral Stable Isotope Data 2011-10-12 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/12216 Investigator B. Williams Investigator A.G. Grottoli 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 15N,Muricella sp.,null,per mil AIR,null,corals and sclerosponges,corrected,elemental analysis|isotope ratio mass spectrometry,N,corrected for depth according to Williams and Grottoli (GCA 2010) earth science paleoclimate corals and sclerosponges delta 13C,Muricella sp.,null,per mil VPDB,null,corals and sclerosponges,corrected,elemental analysis|isotope ratio mass spectrometry,N,corrected for depth according to Williams and Grottoli (GCA 2010) earth science paleoclimate corals and sclerosponges delta 13C,Antipathes sp.,null,per mil VPDB,null,corals and sclerosponges,corrected,elemental analysis|isotope ratio mass spectrometry,N,corrected for depth according to Williams and Grottoli (GCA 2010) earth science paleoclimate corals and sclerosponges delta 15N,Antipathes sp.,null,per mil AIR,null,corals and sclerosponges,corrected,elemental analysis|isotope ratio mass spectrometry,N,corrected for depth according to Williams and Grottoli (GCA 2010) earth science paleoclimate corals and sclerosponges carbon isotopes geoscientificInformation 1900 AD 2007 AD 50 cal yr BP -57 cal yr BP Complete 7.2678 7.2678 134.5178 134.5178 105 105 Ocean Pacific Ocean Western Pacific Ocean Micronesia Palau Short Drop Off Reef>LATITUDE 7.2678>LONGITUDE 134.5178 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 Williams, B. and A.G. Grottoli. 2010. Recent shoaling of the nutricline and thermocline in the western tropical Pacific. Geophysical research Letters, Vol. 37, L22601. doi:10.1029/2010GL044867.

Long records of subsurface ocean observations are key to constrain our understanding of the climate response of the tropical Pacific to increasing greenhouse gases. Due to the lack of continuous ocean observations, proxies become essential to estimate changes in the tropical thermocline related to changes in Walker circulation. Here, we present high resolution stable nitrogen (d15N) and carbon (d13C) isotope records from three proteinaceous corals spanning the top 105 m of the euphotic zone from an offshore Palauan reef in the western tropical Pacific. Dated with radiocarbon-derived growth chronologies, these isotope records indicate a shoaling of the mean nutricline and thus the thermocline as well, and a likely increase in primary productivity in the western tropical Pacific since the mid-to-late 1970s. Thus, these are the first subsurface proxy data extending below 20 m to support a slowdown of the tropical Pacific Walker circulation during the 20th Century. STUDY NOTES: This dataset contains stable isotope (d13C and d15N) values from three proteinaceous corals (Antipathes sp and Muricella sp) collected from Short Drop Off reef, 2 km offshore of Palau in the western tropical Pacific. Corals were collected from 5 m, 85 m, and 105 m depth. Stable isotopes were measured by combusting each organic skeletal sample in a Costech Elemental Analyzer where the resulting N2 and CO2 gases were analyzed with a Finnigan Delta IV Plus isotope ratio mass spectrometer via a Finnigan ConFlow III open split interface. D15N values were reported relative to air. d13C values were reported relative to Vienna Peedee Belemnite Limestone Standard (VPDB). The standard deviation of the mean of repeated measurements of internal standards was ±0.15 per mil for d15N and ±0.06 for d13C. At least 10% of all samples were run in duplicate. The stable isotope records were depth-corrected according to Williams and Grottoli (GCA, 2010). Growth chronologies for the stable isotope records were developed through identification of the 14C bomb-curve. D14C was measured at the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) Facility at the Woods Hole Oceanographic Institution using standard NOSAMS methods [Osborne et al., 1994]. Values were reported as D14C (the per mil deviation of 14C/12C of the sample relative to that of 95% Oxalic Acid-1 standard) and were blank corrected. The reported uncertainty of duplicate analyses of a known standard was typically ±5-8 per mil.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/palau2010.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/palau2010.xls USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11