NDLI: Modeling El Niño and its tropical teleconnections during the last glacial‐interglacial cycle

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

Content Provider	Semantic Scholar
Author	Otto-Bliesner, Bette L. Brady, Esther Shin, Sang-Ik Liu, Zhengyu Shields, Christine A.
Copyright Year	2003
Abstract	(1) 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 Ninos/La Ninas compared to present for the Holocene and stronger El Ninos/La Ninas 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 Nino/ La Nina but also changes in the atmospheric circulation and hydrologic cycle. INDEX TERMS: 3344 Meteorology and Atmospheric Dynamics: Paleoclimatology; 4267 Oceanography: General: Paleoceanography; 4522 Oceanography: Physical: El Nino; 3337 Meteorology and Atmospheric Dynamics: Numerical modeling and data assimilation; 9604 Information Related to Geologic Time: Cenozoic. Citation: Otto-Bliesner, B. L., E. C. Brady, S.-I. Shin, Z. Liu, and C. Shields, Modeling El Nino and its tropical teleconnections during the last glacial-interglacial cycle, Geophys. Res. Lett., 30(23), 2198, doi:10.1029/2003GL018553, 2003.
File Format	PDF HTM / HTML
DOI	10.1029/2003GL018553
Alternate Webpage(s)	http://www.cgd.ucar.edu/ccr/ottobli/pubs/Otto-Bliesner-GRL-30.pdf
Alternate Webpage(s)	https://doi.org/10.1029/2003GL018553
Volume Number	30
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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