noaa-coral-1877
Amedee Lighthouse - Elemental Ratios, Isotope, and SST Calibration Data
Quinn, T.M.; Sampson, D.S.
Amedee Lighthouse - Elemental Ratios, Isotope, and SST Calibration Data
2002-01-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/1877
Investigator
T.M.
Quinn
Investigator
D.S.
Sampson
earth science
paleoclimate
corals and sclerosponges
strontium/calcium,Porites lutea,null,millimole per mole,null,corals and sclerosponges,interpolated,inductively-coupled plasma mass spectrometry,N,null
earth science
paleoclimate
corals and sclerosponges
uranium/calcium,Porites lutea,null,micromole per mole,null,corals and sclerosponges,interpolated,inductively-coupled plasma mass spectrometry,N,null
earth science
paleoclimate
corals and sclerosponges
barium/calcium,Porites lutea,null,micromole per mole,null,corals and sclerosponges,interpolated,inductively-coupled plasma mass spectrometry,N,null
earth science
paleoclimate
corals and sclerosponges
magnesium/calcium,Porites lutea,null,millimole per mole,null,corals and sclerosponges,interpolated,inductively-coupled plasma mass spectrometry,N,null
earth science
paleoclimate
instrumental
sea surface temperature,null,null,degree Celsius,null,instrumental,null,null,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
notes,null,null,null,null,corals and sclerosponges,null,null,C,null
earth science
paleoclimate
instrumental
sea surface temperature,null,null,degree Celsius,null,instrumental,null,null,N,in situ data logger
earth science
paleoclimate
instrumental
salinity,sea surface,null,parts per thousand,null,instrumental,null,null,N,in situ data logger
earth science
paleoclimate
corals and sclerosponges
oxygen isotopes
earth science
paleoclimate
corals and sclerosponges
trace metals
earth science
paleoclimate
corals and sclerosponges
carbon isotopes
geoscientificInformation
1968 AD
1992 AD
-18 cal yr BP
-42 cal yr BP
Complete
-22.48
-22.48
166.47
166.47
Ocean
Pacific Ocean
South Pacific Ocean
Melanesia
New Caledonia
Amedee Lighthouse>LATITUDE -22.48>LONGITUDE 166.47
None
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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
325 Broadway, E/NE31
Boulder
CO
80305-3328
USA
online
ASCII
Quinn, T.M., and D.S. Sampson. 2002. A multi-proxy approach to reconstructing sea-surface conditions using coral skeleton geochemistry. Paleoceanography 17(4):1062.
We use elemental ratio (Mg/Ca, Sr/Ca, U/Ca and Ba/Ca) and oxygen isotope data from a Porites lutea coral head collected from offshore Amédée Island, New Caledonia (22°29S, 166°28E) to assess the degree to which changes in these geochemical variables reflect variations in sea surface conditions. We have assessed the robustness of each geochemical proxy by comparing 25 years (1992ŋ1968) of monthly geochemical variations with a local record of sea surface temperature (SST) and with the appropriate 1° by 1° grid box from a global gridded SST data set. We conclude from our comparison that the most consistent proxies of monthly SST variations at this site are d18O (r2 = -0.84; p = <.0001) and Sr/Ca (r2 = -0.84; p = <.0001). The fidelity of the coral-based Sr/Ca-SST proxy was assessed via calibration-verification exercises at New Caledonia and Rarotonga. The ŋpaleoclimateŋ accuracy of the coral Sr/Ca-SST technique is judged to be robust, and the precision of the technique is estimated to be ~0.3° ą 0.5 (2) based on the calibration-verification exercise. In contrast, monthly variations in Mg/Ca and U/Ca ratios are only moderately correlated with monthly SST variations (r2 = 0.55; p = <.0001 for Mg/Ca and r2 = 0.47; p = <.0001). The strength of the correlation between SST and Mg/Ca and U/Ca varies as a function of time, suggesting that variations in these ratios are not a simple function of SST variations. This variability in goodness of fit between U/Ca-SST and Mg/Ca-SST may ultimately limit the use of these ratios as coral paleothermometers. Averaging or stacking individual proxy SST records (Sr/Ca, Mg/Ca and U/Ca) to generate a composite proxy SST record does not necessarily improve the proxy record if the signal-to-noise ratio in each proxy is highly variable. For example, stacking of Sr/Ca-Mg/Ca-U/Ca records at New Caledonia produces a proxy SST time series that has greater standard error than the individual Sr/Ca-SST time series (cf. ordinary least squares standard error of 1.16°C versus 0.86°C). Ba/Ca variations have little correlation with SST, Sr/Ca, Mg/Ca, or U/Ca variations at New Caledonia. In conclusion, variations in oxygen isotopic composition of seawater, calculated by removing the Sr/Ca-based temperature component of the d18O signal, agree reasonably well with observed variations in sea surface salinity, especially at the interannual timescale.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/quinn2002_noaa.txt
Formatted Text File;
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/quinn2002-inst_noaa.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11