Late Quaternary paleoceanography of the northwestern Pacific: Results from IMAGES program

Northern and southern hemisphere controls on seasonal sea surface temperatures in the Indian Ocean during the last deglaciation

“…Beside the western Indian Ocean, a synthesis of deglacial SST records highlights such discrepancies at other tropical locations. These sites include the western equatorial Atlantic [Weldeab et al, 2006;Jaeschke et al, 2007], eastern, and western Equatorial Pacific [Lea et al, 2000;Lea et al, 2006;de Garidel-Thoron et al, 2007;Kienast et al, 2001;Linsley et al, 2010;Rosenthal et al, 2006;Steinke et al, 2008;Visser et al, 2003] (Figure 7). Another study also documents the contrasting cooling and warming trends registered in alkenones and Mg/Ca during HE1 from the same marine core derived from South of Sumatra in the eastern Indian Ocean [Mohtadi et al, 2010].…”

“…More recent SST records based on alkenone unsaturation index (U K′ 37 ) have challenged this hypothesis, suggesting that the Eastern equatorial Pacific (EEP) SST were rather responding to changes in the Atlantic Meridional Overturning Circulation (AMOC) [Kiefer and Kienast, 2005;Kienast et al, 2001;Kienast et al, 2006]. Similar warming patterns of foraminifera Mg/Ca lead U K′ 37 SSTs at terminations in the western equatorial Pacific Kienast et al, 2001;Linsley et al, 2010;Rosenthal et al, 2006;Steinke et al, 2008;Visser et al, 2003]. Although the SST differences are systematic and, in some way, related to identifiable oceanic processes [Mix, 2006], it is not yet fully understood what controls such differences between temperature proxies.…”