The precipitation and temperature observation data (CRU20) from the Climate Research Unit, University of East Anglia, United Kingdom is used to validate the model performance in simulating the current climate. The PRECIS captures important regional information on seasonal rainfall, which is missing in its parent GCM simulation. The basic parameters analysed to study the future climate change occurring during 2071-2100 are the mean surface (1.5 meters) temperature and precipitation. The analysis is comprised of both annual mean and seasonal mean for December-January-February (DJF), March-April-May (MAM), June-July-August (JJA) and September-October-November (SON). To detect the possible atmospheric circulation change during the monsoon periods (DJF and JJA) in the future climate we analyzed the mean 850hPa wind for the lower emission scenario (B2).
Overall, both the lower emission (B2) and the higher emission (A2) scenarios produce an increase in the annual mean temperature over SEA during 2071-2100. However, the A2 scenario shows the larger increase in temperature. The land area show higher annual mean warming compared to maritime regions. The SEA land surface annual mean warming is in the range of 1.5-3.0 °C for B2 and 3.0-4.5 °C for A2. Meanwhile the SEA maritime surface annual mean warming is 0.5-1.5 °C for B2 and 2.0-3.5 °C for A2. Both the B2 and A2 scenarios show the highest increase in mean annual temperature to occur over western Sumatra, southern Borneo and central Thailand. The A2 simulation projects a spatial difference by about 0.5°C between the maritime SEA and western Pacific region. However, this spatial difference in warming is not observed with the B2 simulation. At a more localized scale, over Malaysia, the annual mean surface temperature increase is lowest for northern Peninsular and highest for central Peninsular and Sabah. Seasonally the rate of warming varies with the greatest change occurring during the summer months (JJA) for both B2 and A2, with the most significant warming to occur over western Sumatra and southern Borneo.
The precipitation and temperature observation data (CRU20) from the Climate Research Unit, University of East Anglia, United Kingdom is used to validate the model performance in simulating the current climate. The PRECIS captures important regional information on seasonal rainfall, which is missing in its parent GCM simulation. The basic parameters analysed to study the future climate change occurring during 2071-2100 are the mean surface (1.5 meters) temperature and precipitation. The analysis is comprised of both annual mean and seasonal mean for December-January-February (DJF), March-April-May (MAM), June-July-August (JJA) and September-October-November (SON). To detect the possible atmospheric circulation change during the monsoon periods (DJF and JJA) in the future climate we analyzed the mean 850hPa wind for the lower emission scenario (B2).
Overall, both the lower emission (B2) and the higher emission (A2) scenarios produce an increase in the annual mean temperature over SEA during 2071-2100. However, the A2 scenario shows the larger increase in temperature. The land area show higher annual mean warming compared to maritime regions. The SEA land surface annual mean warming is in the range of 1.5-3.0 °C for B2 and 3.0-4.5 °C for A2. Meanwhile the SEA maritime surface annual mean warming is 0.5-1.5 °C for B2 and 2.0-3.5 °C for A2. Both the B2 and A2 scenarios show the highest increase in mean annual temperature to occur over western Sumatra, southern Borneo and central Thailand. The A2 simulation projects a spatial difference by about 0.5°C between the maritime SEA and western Pacific region. However, this spatial difference in warming is not observed with the B2 simulation. At a more localized scale, over Malaysia, the annual mean surface temperature increase is lowest for northern Peninsular and highest for central Peninsular and Sabah. Seasonally the rate of warming varies with the greatest change occurring during the summer months (JJA) for both B2 and A2, with the most significant warming to occur over western Sumatra and southern Borneo.
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