The impact of recent model improvements on GISS GCM predictions of climate change. Final technical report, September 15, 1992--September 14, 1994

Technical Report · Sat Dec 31 04:00:00 EST 1994

DOI:https://doi.org/10.2172/378846· OSTI ID:378846

Druyan, L M

The response of the 8 x 10{degree} horizontal resolution version of Model 2 to the forcing of globally observed SST (1980--1986) was evaluated. The simulations showed a realistic interannual variability of interhemispheric gradients of layer mean temperatures in response to observed SST gradients, but modeled near-surface winds over the Atlantic Ocean were much weaker than observed, a symptom of the Model 2 planetary boundary layer (PBL). In addition, the interannual variability of peak-season rainfall rates over Northeast Brazil (Nordeste) from the experiment was considerably smaller than the observed, although the observed negative association between seasonal Nordeste rainfall and interhemispheric Atlantic SST differences was weakly present. Preliminary experiments at 4 x 5{degree} resolution incorporating two of the new model parameterizations show more variability of the simulated Nordeste rainfall in response to the SST forcing, but only slight improvement in the correlation with observations.

• Research Organization: Columbia Univ., New York, NY (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-92ER61477
• OSTI ID: 378846
• Report Number(s): DOE/ER/61477--T1; ON: DE96015297
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
CLIMATE MODELS
CLIMATIC CHANGE
FORECASTING
GENERAL CIRCULATION MODELS
PROGRESS REPORT
THREE-DIMENSIONAL CALCULATIONS