Distinct effects of global mean warming and regional sea surface warming pattern on projected uncertainty in the South Asian summer monsoon

作者：Chen, Xiaolong; Zhou, Tianjun^*

来源：Geophysical Research Letters, 2015, 42(21): 9433-9439.

DOI：10.1002/2015GL066384

• CLIMATE-CHANGE
• INTERANNUAL VARIABILITY
• FUTURE PROJECTIONS
• CIRCULATION CHANGE
• CMIP5
• RESPONSES
• PRECIPITATION
• CONTRASTS
• AEROSOL
• MODELS

Significant uncertainties in the projected South Asian summer monsoon (SASM) have been observed in the released Fifth Phase of the Coupled Model Intercomparison Project (CMIP5) data set. Knowing what factors dominate the uncertainties is critical to constraining the local climate changes. Analyzing state-of-the-art climatemodel simulations under the RCP8.5 scenario, we find that uncertainties in the circulation primarily result from the divergent global mean warming across models. In contrast, the compensation between dynamic and thermodynamic effects makes the spread in monsoon rainfall independent of the global temperature change. Via a suite of sensitivity experiments, we identify that the uncertainties in the SASM rainfall are dominated by the Indo-Pacific sea surface temperature (SST) warming pattern, especially around the western central Pacific. The SST warming pattern plays its role by changing the zonal temperature gradient over the SASM region and modulating the interhemispheric moisture transport. We highlight that the SST warming patterns require more attention in constraining the projected regional rainfall changes.

• 出版日期2015-11-16
• 单位中国科学院大气物理研究所; 中国科学院大学