[口头报告]The Mid-Holocene East Asian Summer Monsoon Simulated by PMIP4-CMIP6 and PMIP3-CMIP5: Model Uncertainty and Its Possible Sources

The Mid-Holocene East Asian Summer Monsoon Simulated by PMIP4-CMIP6 and PMIP3-CMIP5: Model Uncertainty and Its Possible Sources
编号:1179 稿件编号:590 访问权限:私有 更新:2023-04-09 21:30:17 浏览:363次 口头报告

报告开始:2023年05月08日 08:46 (Asia/Shanghai)

报告时间:13min

所在会议:[1B] 1B、第四纪地质与全球变化 » [1B-4] 1B-4 第四纪地质与全球变化

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摘要
The simulated changes of East Asian monsoonal precipitation between mid-Holocene (MH) and pre-industrial (PI) can be either positive or negative depending on the climate model used. This model disagreement becomes even more severe in the Paleoclimate Model Intercomparison Project Phase 4 with Coupled Model Intercomparison Project Phase 6 (PMIP4-CMIP6) than in PMIP3-CMIP5. Here we investigate the possible sources of this model disagreement in North China (NC) and South China (SC). Among the numerous factors analyzed, we find that the PI-to-MH precipitation change over NC and SC are most affected by the uncertainties in the simulated PI East Asian summer monsoon (EASM) intensity (represented by the strength of southerly wind) and the relative PI-to-MH temperature changes between extratropical Eurasian continent and the western tropical Pacific, respectively. If a model overestimates the EASM intensity in PI, it then tends to underestimate its strengthening from PI to MH and the NC summer precipitation, and may even produce a drying there. This relation is stronger in PMIP3-CMIP5 than in PMIP4-CMIP6. If a model overestimates the PI-to-MH summer warming over the extratropical Eurasian continent and the cooling over the western tropical Pacific, it then tends to overestimate the westward extension of the western North Pacific subtropical high over SC, and to produce a negative precipitation change there. The first factor represents the uncertainty in the simulated PI climatology of models while the second is related to the uncertainty in the climate sensitivity of models, they are independent of each other in PMIP4-CMIP6 but positively correlated in PMIP3-CMIP5.
关键字
Mid-Holocene; East Asian summer monsoon; PMIP4-CMIP6; PMIP3-CMIP5; North China; South China
报告人
毋宇斌
中国科学院地球环境研究所

稿件作者
毋宇斌 中国科学院地球环境研究所
刘永岗 北京大学物理学院大气与海洋科学系
周卫健 中国科学院地球环境研究所
张健 北京大学物理学院大气与海洋科学系
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