TY - JOUR
T1 - Modeling El Niño and its tropical teleconnections during the last glacial-interglacial cycle
AU - Otto-Bliesner, Bette L.
AU - Brady, Esther C.
AU - Shin, Sang Ik
AU - Liu, Zhengyu
AU - Shields, Christine
PY - 2003/12/1
Y1 - 2003/12/1
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/1542755952
U2 - 10.1029/2003GL018553
DO - 10.1029/2003GL018553
M3 - Article
AN - SCOPUS:1542755952
SN - 0094-8276
VL - 30
SP - CLM 4-1 - CLM 4-4
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 23
ER -