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Dynamical and observational constraints on tropical Pacific sea surface temperatures at the last glacial maximum

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons62398

Harrison,  Sandy P.
Research Group Paleo-Climatology, Dr. S. P. Harrison, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Liu, Z., Shin, S., Behling, P., Prell, W., Trend-Staid, M., Harrison, S. P., et al. (2000). Dynamical and observational constraints on tropical Pacific sea surface temperatures at the last glacial maximum. Geophysical Research Letters, 27(1), 105-108. doi:10.1029/1999GL002321.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-CCB9-8
Abstract
Asynchronously coupled atmosphere and ocean general circulation model simulations are used to examine the consequences of changes in the west/east sea-surface temperature (SST) gradient across the equatorial Pacific at the last glacial maximum (LGM). Simulations forced by the CLIMAP SST for the LGM, where the west/east SST gradient across the Pacific is reduced compared to present, produce a reduction in the strength of the trade: winds and a decrease in the west/east slope of the equatorial thermocline that is incompatible with thermocline depths newly inferred from foraminiferal assemblages. Stronger- than-present trade winds, and a more realistic simulation of the thermocline slope, are produced when eastern Pacific SSTs are 2 degrees C cooler than western Pacific SSTs. Our study highlights the importance of spatial heterogeneity in tropical SSTs in determining key features of the glacial climate. [References: 20]