Numerical experiments on the atmospheric response to a sea surface temperature anomaly over the equatorial eastern Pacific Ocean

Details Numerical experiments on the atmospheric response to a sea surface temperature anomaly over the equatorial eastern Pacific Ocean Numerical experiments on the atmospheric response to a sea surface temperature anomaly over the equatorial eastern Pacific Ocean

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986csnm.work...19m&link_type=abstract

In World Climate Program Workshop on Comparison of Simulations by Numerical Models of the Sensitivity of the Atmospheric Circula

Computer Science

1

Air Water Interactions, Anomalous Temperature Zones, Atmospheric Models, Equatorial Atmosphere, Pacific Ocean, Sea Surface Temperature, Atmospheric Circulation, Atmospheric Moisture, Planetary Boundary Layer, Spatial Resolution, Tropical Meteorology

Scientific paper

Differences between selected fields obtained in simulations performed with several versions of the UCLA General Circulation Model (GCM) for normal and anomalous sea surface temperature (SSTA) are presented. The SSTA pattern resembles that observed during the mature phase of El Nino, and is kept constant in time. Simulations used the 9-layer with low and high horizontal resolutions, and the 15-layer with low horizontal resolution versions of the UCLA GCM. The SSTA results in anomalous precipitation in the tropics which is mostly balanced by anomalous moisture flux convergence. The anomalous moisture fluxes in the planetary boundary layer (PBL) and the free atmosphere have comparable magnitude with different geographical distributions. Consistently, the pattern for the moisture flux convergence in the entire atmospheric column, which is very similar to that to anomalous precipitation, is not similar to any of these two components. Findings suggest that a correct simulation of the moisture flux both in the PBL and the free atmosphere may be crucial in determining the distribution of anomalous precipitation.

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