Climatic Change Scenarios for Monsoon Asia Based on 2 × CO2-GCM Experiments

Abstract

This investigation is made of the possible climatic change scenarios due to a doubling of carbon dioxide concentration in the atmosphere. The three global climate or general circulation models(GCM) have been used to produce the climatic change scenarios for Monsoon Asia. Using these scenarios, the information was obtained on the possible distribution of annual air temperature, annual precipitation, annual global solar radiation, annual net radiation, and annual average of radiative dryness index on the Monsoon Asia. Regional averages of relative changes in climatic elements under 2xCO2 induced warm climates were calculated for the four sub-areas corresponding to the ice and desert climate area(I), cool and/or warm temperate climate area (II), subtropical and/or tropical climate area(III), and humid tropical area (IV). The relative changes in annual temperature were fairly large on the sub-area I than on the other sub-areas. The grid mesh maps showing the regional distribution of climatic elements under 2xCO2 conditions can be used approximately as climatic change scenarios for Monsoon Asia.