ocean-atmosphere climate coupling acts to enhance the IOD-related climate signal captured by coral ?18O over that expected from SST anomalies alone

The annual range in coral ?18O is larger than expected based on SST alone, using published coral ?18O-SST dependencies of between 0.17??i¿½C?1 and 0.23??i¿½C?1 [Gagan et al., 2012]. Previous studies in the Mentawai Islands chain have shown that ocean-atmosphere climate coupling acts to enhance the IOD-related climate signal captured by coral ?18O over that expected from SST anomalies alone [Abram et al., 2007, 2008]. The sharp 18O enrichments that characterize the winter isotopic maximum in the South Pagai coral similarly support an additional and complementary rainfall modulation of the coral record during the IOD season.

d18O (CO15ABSP01A): interpretation4_scope: '' has been replaced by 'isotope'

Column 'addRAP2Sy7ISSHSNvo6M', with variable name 'yearEnsemble', was added to the dataset
Column 'addRkvQICmZYR7OimNNy', with variable name 'yearEnsemble', was added to the dataset

Nerilie J. Abram, Bronwyn C. Dixon, Madelaine G. Rosevear, Benjamin Plunkett, Michael K. Gagan, Wahyoe S. Hantoro and Steven J. Phipps

Abram, N. J., Dixon, B. C., Rosevear, M. G., Plunkett, B., Gagan, M. K., Hantoro, W. S. and Phipps, S. J.: Optimized coral reconstructions of the Indian Ocean Dipole: An assessment of location and length considerations, Paleoceanography, 30(10), 1391–1405, doi:10.1002/2015pa002810, 2015.

The paper does not assess correlation between d18O and SST due to lack of instrumental SST and upwelling. My assessment of the data shows a 0.36 correlation between coral D18O and coral Sr/Ca suggesting temp rependcany is low. This suggest the coral d18O is primary a salinity signal. note the authors also provide a coral d18Osw data set.

Deng, Wenfeng; Liu, Xi; Chen, Xuefei; Wei, Gangjian; Zeng, Ti; Xie, Luhua; Zhao, Jian-xin

d18O (WEBe86ec079): interpretation2_scope: '' has been replaced by 'isotope'
d18O (WEBe86ec079): interpretation3_scope: '' has been replaced by 'isotope'