Modeling El Niño and its tropical teleconnections during the last glacial-interglacial cycle

Modeling El Niño and its tropical teleconnections during the last glacial-interglacial cycle

Simulations with the NCAR Climate System Model (CSM), a global, coupled ocean‐atmosphere‐sea ice model, for the last glacial‐interglacial cycle reproduce recent estimates, based on alkenones and Mg/Ca ratios, of sea surface temperature (SST) changes and gradients in the tropical Pacific and predict...

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Veröffentlicht in:Geophysical research letters 2003-12, Vol.30 (23), p.CLM4.1-n/a
Hauptverfasser: Otto-Bliesner, Bette L., Brady, Esther C., Shin, Sang-Ik, Liu, Zhengyu, Shields, Christine
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container_issue 23
container_start_page CLM4.1
container_title Geophysical research letters
container_volume 30
creator Otto-Bliesner, Bette L.
Brady, Esther C.
Shin, Sang-Ik
Liu, Zhengyu
Shields, Christine
description Simulations with the NCAR Climate System Model (CSM), a global, coupled ocean‐atmosphere‐sea ice model, for the last glacial‐interglacial cycle reproduce recent estimates, based on alkenones and Mg/Ca ratios, of sea surface temperature (SST) changes and gradients in the tropical Pacific and predict weaker El Niños/La Niñas compared to present for the Holocene and stronger El Niños/La Niñas for the Last Glacial Maximum (LGM). Changes for the LGM (Holocene) are traced to a weakening (strengthening) of the tropical Pacific zonal SST gradient, wind stresses, and upwelling and a sharpening (weakening) of the tropical thermocline. Results suggest that proxy evidence of weaker precipitation variability in New Guinea and Ecuador are explained not only by changes in El Niño/La Niña but also changes in the atmospheric circulation and hydrologic cycle.
doi_str_mv 10.1029/2003GL018553
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source Wiley-Blackwell AGU Digital Library; Wiley Online Library; Wiley Online Library Free Content; EZB Electronic Journals Library
subjects Brackish
Earth, ocean, space
Exact sciences and technology
Freshwater
Marine
title Modeling El Niño and its tropical teleconnections during the last glacial-interglacial cycle
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