期刊
ADVANCES IN ATMOSPHERIC SCIENCES
卷 33, 期 9, 页码 1061-1070出版社
SCIENCE PRESS
DOI: 10.1007/s00376-016-5215-y
关键词
PlioMIP; mid-Piacenzian; African summer monsoon; vegetation change
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB03020602]
- National Natural Science Foundation of China [41175072, 41305073, 41402158, 41472160]
Using model results from the first phase of the Pliocene Model Intercomparison Project (PlioMIP) and four experiments with CAM4, the intensified African summer monsoon (ASM) in the mid-Piacenzian and corresponding mechanisms are analyzed. The results from PlioMIP show that the ASM intensified and summer precipitation increased in North Africa during the mid-Piacenzian, which can be explained by the increased net energy in the atmospheric column above North Africa. Further experiments with CAM4 indicated that the combined changes in the mid-Piacenzian of atmospheric CO2 concentration and SST, as well as the vegetation change, could have substantially increased the net energy in the atmospheric column over North Africa and further intensified the ASM. The experiments also demonstrated that topography change had a weak effect. Overall, the combined changes of atmospheric CO2 concentration and SST were the most important factor that brought about the intensified ASM in the mid-Piacenzian.
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