基于台站观测资料的高原感热对高原季风影响研究 

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  • 成都信息工程大学大气科学学院/高原大气与环境四川省重点实验室/成都平原城市气象与环境四川省野外科学观测研究站/四川省气象灾害预报预警工程实验室,四川 成都 610225

网络出版日期: 2025-04-29

基金资助

国家自然科学基金青年项目(42105034);第二次青藏高原综合科学考察研究项目(2019QZKK0103);四川省自然科学基金项目(2025ZNSFSC0332);四川省气象局重点创新团队项目(SCQXTD202402

The Impact of Plateau Sensible Heat on the Plateau Monsoon Based on Station Observations 

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  • College of Atmospheric SciencesChengdu University of Information Technology / Sichuan Key Laboratory of Plateau
    Atmosphere and Environment / Chengdu Plain Urban Meteorology and Environment Sichuan Province Field Scientific
    Observation Research Station / Sichuan Province Laboratory of Meteorological Disaster Forecast and Warning Engineering
    Chengdu 610225SichuanChina

Online published: 2025-04-29

摘要

为了研究高原感热与高原季风之间的关系,本文使用 1979-2016 年站点感热资料和 ERA5EC‐MWF Reanalysis V5)再分析资料,计算不同高原季风指数,并利用相关分析与合成分析方法对高原感热和高原季风的变化特征和相关关系进行分析,探讨高原感热对高原季风的影响。结果表明:(1IPMtangIPMzhang两种高原季风指数因定义角度不同导致对高原感热的响应存在显著时效性差异,其中对于夏季高原季风与夏季感热的关系,IPMzhang呈显著负相关(r=-0. 30p<0. 1),而IPMtang呈弱的负相关但不显著;对于夏季高原季风与5月感热的关系,IPMtang呈显著正相关(r=0. 32p<0. 1),IPMzhang呈显著负相关(r=-0. 44p<0. 01),反映了 5月感热对于高原季风强弱的影响。(2)对于夏季感热和夏季高原季风的空间相关分布特征,IPMtang为东西反向,而 IPMzhang则呈南北相反。尽管不同指数反映的相关区域存在差异,但均可以与季风和降水的相关性有效对应,反映了季风活动下,因为降水所带来的土壤湿度变化后,对高原感热的抑制作用。(3)对于5月感热而言,5月高原南部感热偏强时,会激发夏季对流层高层高原主体异常低压系统以及中纬度“---”型波列生成,配合低层上升的垂直结构以及对流层中高层的异常高低压系统,为高原东南部降水提供动力-热力协同作用,促进该地区的降水生成。600 hPa上高原东南部的异常低压系统和高原北部的异常西风分量,也分别有利于 IPMtang的偏强与 IPMzhang的偏弱,揭示了5月感热对于夏季季风活动的影响。

本文引用格式

李义鑫, 张少波, 赵 勇, 杨显玉 . 基于台站观测资料的高原感热对高原季风影响研究 [J]. 高原气象, 0 : 1 . DOI: 10.7522/j.issn.1000-0534.2025.00045

Abstract

To investigate the relationship between sensible heatSHover the Tibetan PlateauTPand TP monsoon dynamicsthis study employs station-derived SH data1979-2016alongside ERA5 reanalysis datasets to compute multiple TP monsoon indexes. Using correlation and composite analysesthe spatiotemporal variability and interactions between SH and monsoon systems were explained. The primary findings are summarized as follows:(1The two monsoon indexesIPMtang and IPMzhangexhibit divergent temporal responses to SH variabilityattributable to their distinct definitions. Summer SH and summer monsoon intensity show a significant negative correlation with IPM zhangr= - 0. 30p<0. 1but only a weakstatistically insignificant correlation with IPM tang. ConverselyMay SH correlates positively with summer IPMtangr=0. 32p<0. 1and negatively with summer IPM zhangr=-0. 44p<0. 01),underscoring May SH’s critical role in preconditioning monsoon intensi‐ ty.2For summer SH and monsoon interactionsIPMtang reveals an east-west dipole spatial correlation with SHwhereas IPMzhang displays a north-south contrast. Despite regional disparitiesboth indexes align with monsoon-precipitation linkagesreflecting soil moisture feedback that suppresses SH through monsoon-driven precipitation.3Elevated May SH across the southern TP initiates an upper-tropospheric anomalous low-pressure system over the central TP in summergenerating a midlatitude“- + - + -”wave train. Coupled with a low-level ascending vertical structure and anomalous mid-upper tropospheric pressure systemsthese dynamics establish a synergistic thermodynamic framework conducive to precipitation in the southeastern TP. A 600 hPa anomalous low-pressure system over the southeastern TP and intensified westerlies over the northern TP further strengthen IPM tang while weakening IPMzhangdemonstrating May SH’s pivotal influence on summer monsoon modulation.

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