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

Details 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

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30wclm4o&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 23, pp. CLM 4-1, CiteID 2198, DOI 10.1029/2003GL018553

Mathematics

Logic

13

Meteorology And Atmospheric Dynamics: Paleoclimatology, Oceanography: General: Paleoceanography, Oceanography: Physical: El Nino, Meteorology And Atmospheric Dynamics: Numerical Modeling And Data Assimilation, Information Related To Geologic Time: Cenozoic

Scientific paper

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.

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