Gulf of Mexico 600 Year Mg/Ca SST Reconstructions Richey, J.N.; Poore, R.Z.; Flower, B.P.; Quinn, T.M.; Hollander, D.J. Richey, J.N. Poore, R.Z. Flower, B.P. Quinn, T.M. Hollander, D.J. Little Ice Age (LIA) Sea Surface Temperature Reconstruction earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium/calcium,Globigerinoides ruber white,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,G. ruber white) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (PE07-5I>LATITUDE 27.55>LONGITUDE -92.1683) (PE07-2>LATITUDE 26.675>LONGITUDE -93.925) We present 2 new decadal-resolution foraminiferal Mg/Ca-SST records covering the past 6-8 centuries from the northern Gulf of Mexico (GOM). These records provide evidence for a Little Ice Age (LIA) cooling of 2°C, consistent with a published Mg/Ca record from Pigmy Basin. Comparison of these 3 records with existing SST proxy records from the GOM-Caribbean region show that the magnitude of LIA cooling in the Atlantic Warm Pool (AWP) was significantly larger than the mean hemispheric cooling of <1°C. We propose that a reduction in the intensity and spatial extent of the AWP during the LIA, combined with associated changes in atmospheric circulation may account for the regional SST patterns observed in the GOM-Caribbean region during the LIA. STUDY NOTES: Foraminiferal Mg/Ca SST reconstructions from the Fisk and Garrison Basins in the northern Gulf of Mexico covering the last 600 years at decadal resolution. Mg/Ca measurements are on the 250-300 micron size fraction of Globigerinoides ruber (white). Mg/Ca is converted to SST using the equation: Mg/Ca=0.449exp(0.09*SST). NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Richey, J.N. Investigator : Poore, R.Z. Investigator : Flower, B.P. Investigator : Quinn, T.M. Investigator : Hollander, D.J. 2010-06-11 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/10492 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/richey2009/richey2009.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/richey2009/richey2009.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/richey2009/richey2009.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/richey2009/richey2009.txt English https://www.ncdc.noaa.gov/paleo/study/10492 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/richey2009/richey2009.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/richey2009/richey2009.txt Richey, J.N., R.Z. Poore, B.P. Flower, T.M. Quinn, and D.J. Hollander. 2009. Regionally coherent Little Ice Age cooling in the Atlantic Warm Pool. Geophys. Res. Lett., 36, L21703, doi:10.1029/2009GL040445 START YEAR: 752 cal yr BP * END YEAR: 0 cal yr BP -93.925 26.675 -92.1683 27.55