Strengthened African summer monsoon in the mid-Piacenzian
Strengthened African summer monsoon in the mid-Piacenzian
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DOI：
10.1007/s00376-016-5215-y
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发表时间：
2016-07
影响因子：
5.8
通讯作者：
Ran Zhang;Zhongshi Zhang;D. Jiang;Q. Yan;Xin Zhou;Zhigang Cheng
中科院分区：
文献类型：
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作者：
Ran Zhang;Zhongshi Zhang;D. Jiang;Q. Yan;Xin Zhou;Zhigang Cheng
利用上新世模式比对项目（PlioMIP）第一期的模式结果和CAM4的4次实验，分析了中皮亚琴期非洲夏季风（ASM）的增强及其机制。PlioMIP结果表明，在中皮亚琴期，北非地区的夏季降水增加，这可能与北非上空大气柱的净能量增加有关。CAM4的进一步实验表明，大气co2浓度和海表温度在中皮亚琴期的联合变化以及植被的变化可能使北非上空大气柱的净能量大幅增加，并进一步加剧了热带风暴。实验还表明，地形变化的影响较弱。总体而言，大气co2浓度和海温的联合变化是导致中皮亚琴世暖流加剧的最重要因素。
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 CO2concentration 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 CO2concentration and SST were the most important factor that brought about the intensified ASM in the mid-Piacenzian.