scholarly journals Final Report for Research Conducted at The Scripps Institution of Oceanography, University of California San Diego from 2/2002 to 8/2003 for ''Aerosol and Cloud-Field Radiative Effects in the Tropical Western Pacific: Analyses and General Circulation Model Parameterizations''

2004 ◽  
Author(s):  
A. M. Vogelmann
Keyword(s):  
General Circulation Model ◽  
General Circulation ◽  
San Diego ◽  
Circulation Model ◽  
Western Pacific ◽  
University Of California ◽  
Final Report ◽  
Radiative Effects ◽  
Scripps Institution ◽  
Tropical Western Pacific

Simulation of the Southern Oscillation in an atmospheric general circulation model

1989 ◽  
Vol 329 (1604) ◽  
pp. 179-188 ◽  
Keyword(s):  
General Circulation Model ◽  
Wind Stress ◽  
General Circulation ◽  
Atmospheric General Circulation Model ◽  
Southern Oscillation ◽  
Low Frequency ◽  
Circulation Model ◽  
Western Pacific ◽  
Atmospheric General Circulation ◽  
The Western Pacific

An atmospheric general circulation model (GCM) was forced with the observed near-global sea surface temperature (SST) pattern for the period January 1970-December 1985. Its response over the Pacific Ocean is compared with Tahiti and Darwin station sea-level pressure and wind stress analyses obtained from Florida State University. The time-dependent SST clearly induces in the model run a Southern Oscillation that is apparent in the time series of all considered variables. The phase of the GCM Southern Oscillation is as observed but its low-frequency variance is too low and the spatial pattern is confined mainly to the western Pacific. The model is successful in reproducing the warm events of 1972—73 and 1982—83 and the cold event 1970—71, but fails with the cold events 1973-74 and 1975-76 and with the warm event 1976-77. Because the GCM is used as the atmospheric component in a coupled model, the response of an equatorial oceanic primitive equation model to both the modelled and observed wind stress is examined. The ocean model responds in essentially the same way to forcing with the observed wind stress and to forcing that corresponds to the first two low-frequency empirical orthogonal functions (EOFS) of the wind variations. These first two EOFS describe a regular eastward propagation of the so signal from the western Pacific to the central Pacific within about one year. The ocean model’s response to the modelled wind stress is too weak. It is similar to the response to the first observed wind stress EOF only. That is, the observed Southern Oscillation appears as a sequence of propagating patterns but the simulated Southern Oscillation appears as one standing pattern. The nature of the deviation of simulated wind stress from observations is further analysed by means of model output statistics.

Local Air–Sea Relationship in Observations and Model Simulations

2006 ◽  
Vol 19 (19) ◽  
pp. 4914-4932 ◽  
Author(s):  
Renguang Wu ◽  
Ben P. Kirtman ◽  
Kathy Pegion
Keyword(s):  
Pacific Ocean ◽  
General Circulation Model ◽  
General Circulation ◽  
Circulation Model ◽  
North Indian Ocean ◽  
Western Pacific ◽  
Western Pacific Ocean ◽  
Tropical Eastern Pacific ◽  
Central Pacific ◽  
Model Simulations

Abstract The present study compares the local simultaneous correlation between rainfall–evaporation and sea surface temperature (SST)–SST tendency among observations, coupled general circulation model (CGCM) simulations, and stand-alone atmospheric general circulation model (AGCM) simulations. The purpose is to demonstrate to what extent the model simulations can reproduce the observed air–sea relationship. While the model-simulated correlation agrees with the observations in the tropical eastern Pacific, large discrepancies are found in the subtropics, midlatitudes, and tropical Indo-western Pacific Ocean regions. In tropical Indo-western Pacific Ocean regions and the midlatitudes where the atmosphere contributes to the observed SST changes, the specified SST simulations produce excessive SST forcing, whereas the CGCM captures the atmospheric feedback on the SST, but with somewhat of an overestimation. In the subtropics, both the AGCM and CGCM produce unrealistic positive rainfall–SST correlations. In the tropical western-central Pacific and the North Indian Ocean, the CGCM-simulated evaporation–SST correlation is opposite to that observed because of an excessive dependence of the sea–air humidity difference on the SST.

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