基于CMIP6模式的东南亚极端降水未来预估及其热动力效应影响研究
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成都信息工程大学 大气科学学院/四川省高原大气环境重点实验室/气候与环境变化联合实验室

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国家自然科学基金资助项目(U20A2097);成都信息工程大学青年科技创新计划项目(KYQN202201)


Projected changes of extreme precipitation and its thermodynamic and dynamic effects over Southeast Asia based on CMIP6 models
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Affiliation:

Plateau Atmosphere and Environment Key Laboratory of Sichuan Province / Joint Laboratory of Climate and Environment Change,Chengdu University of Information Technology School of Atmospheric Science

Fund Project:

The National Natural Science Foundation of China (U20A2097);The Technological Innovation Capacity Enhancement Program of Chengdu University of Information Technology (KYQN202201)

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    摘要:

    东南亚地形复杂且人口众多,极端降水事件对全球变暖的响应较为敏感,其未来演变特征被广泛重视。本文利用26个CMIP6全球气候模式研究了本世纪末东南亚极端降水事件的变化,通过分解水汽收支方程分析降水变化的动力和热力效应。结果表明,本世纪末(2070—2099年)相对历史参考期(1985—2014年),东南亚大部分地区的气候态降水、极端降水事件的发生频率和强度均显著增加。除大雨日数(R10mm)外,其他极端降水指数在SSP5-8.5情景下的变化幅度比SSP2-4.5情景更大。其中强降水量贡献率(R95pTOT)的增长幅度最大,在SSP2-4.5(SSP5-8.5)情景下增加22%(41%)。极端降水变化对气候变暖的响应存在明显的区域性差异。加里曼丹岛将出现更短时集中的极端降水。苏门答腊岛南部的极端降水频率略有减小,且可能发生较强的持续性干旱事件。进一步分析水汽收支方程可知,SSP2-4.5(SSP5-8.5)情景下,热力作用项对P-E(降水减蒸发)的变化贡献为65%(64%),并且模式间一致性更高。而动力作用项对P-E的变化呈抵消趋势,贡献为35%(36%)。这说明相比大尺度环流变化,大气比湿变化引起的水汽辐合是未来东南亚降水量增多的主要因子。

    Abstract:

    Southeast Asia has a complex topography and a large population. The response of extreme precipitation events to global warming is sensitive and its future evolutionary characteristics are widely valued. In this study, 26 global climate models (GCMs) are used to present projected change in precipitation extremes over Southeast Asia at the end of 21st century based on the Coupled Model Intercomparison Project phase 6 (CMIP6) simulations. The thermodynamic and dynamic contributions to future changes in precipitation are analyzed by decomposition of moisture budget equation. The multi-model ensemble medians show that, compared with the historical reference period (1985—2014), the frequency and intensity of climatological precipitation and precipitation extremes in most of Southeast Asia are obviously increased at the end of 21st century (2070—2099) under SSP2-4.5 and SSP5-8.5 scenarios. The variation of precipitation extremes shows significant spatial differences under the global warming. Precipitation extremes with short duration and high intensity will occur in the Kalimantan. In southern Sumatra, the total precipitation of wet days (PRCPTOT) tends to decrease significantly and the occurrence of consecutive dry days (CDD) become more frequent. Except for heavy precipitation days (R10mm), the change of extreme precipitation indices with more pronounced magnitudes under SSP5-8.5 scenario than SSP2-4.5 scenario. The contribution rate of heavy precipitation (R95pTOT) increased by 22% (41%) under SSP2-4.5 (SSP5-8.5) scenario. Quantitative analysis of moisture budget equation shows that, thermodynamic and dynamic effects mainly result in the precipitation climatological changes at the end of 21st century. Compared with the large-scale circulation changes, the thermodynamic component with higher inter-model consistency is the main contribution term. Under SSP2-4.5 (SSP5-8.5) scenario, the contribution of thermodynamic effects accounts for 65% (64%) of the P-E (precipitation minus evaporation) changes. However, the dynamic effects show a counteracting trend to the changes of P-E, which contributes 35% (36%). Moisture convergence caused by atmospheric specific humidity changes is considered as the dominating factor of projected precipitation increase.

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  • 收稿日期:2022-08-05
  • 最后修改日期:2023-03-05
  • 录用日期:2023-04-06
  • 在线发布日期: 2023-04-06
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