从局部角度诊断北太平洋西部夏季季风开始时的大气过程

IF 4.8 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Journal of Climate Pub Date : 2024-06-24 DOI:10.1175/jcli-d-23-0533.1
Sining Ling, Riyu Lu
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引用次数: 0

摘要

摘要 气候学上北太平洋西部夏季季风的开始,即所谓的对流跃变,发生在第 41 个五分位点前后,与强对流突然向东北方向延伸相对应。本研究从局部角度研究了对流跃变的过程。根据各年确定的对流跃变发生日期进行了综合分析。结果表明,对流抑制(CIN)在对流发生日前后急剧下降,而对流可用势能(CAPE)早在对流发生前就达到了最大值,这表明在引发对流的过程中起主导作用的是对流抑制,而不是对流可用势能。进一步的分析表明,CIN 的降低是由于低纬相对湿度的增加引起的,而相对湿度的增加则是水汽辐合增强的结果。水汽输送主要是由对流跃迁区南部边界的东风向东南风或偏南风转移,与季风槽的形成相一致。本观测结果可用于评估模拟夏季季风逐步演变的气候模式。
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Diagnosis of atmospheric processes from a local perspective for the western North Pacific summer monsoon onset
Abstract The climatological western North Pacific summer monsoon onset, so called convection jump, occurs around 41th pentad, corresponding to an abrupt northeastward extension of strong convection. This study investigates the process of convection jump from a local perspective. Composite analyses are performed based on the onset dates that are identified in individual years. The results show that the convective inhibition (CIN) decreases dramatically around the onset dates, while the convective available potential energy (CAPE) reaches its maximum long before the onset, suggesting that the CIN, rather than CAPE, plays a dominant role in triggering convection. Further analysis indicates that the reduction of CIN is induced by the increased low-lever relative humidity, which is the result of enhanced water vapor convergence. The moisture transportation is primarily contributed by the wind transfer from easterlies to southeasterlies or southerlies along the southern boundary of convection jump region, in accordance with the monsoon trough establishment. The present observational results may be used to evaluate climate models in simulating stepwise evolution of summer monsoon.
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来源期刊
Journal of Climate
Journal of Climate 地学-气象与大气科学
CiteScore
9.30
自引率
14.30%
发文量
490
审稿时长
7.5 months
期刊介绍: The Journal of Climate (JCLI) (ISSN: 0894-8755; eISSN: 1520-0442) publishes research that advances basic understanding of the dynamics and physics of the climate system on large spatial scales, including variability of the atmosphere, oceans, land surface, and cryosphere; past, present, and projected future changes in the climate system; and climate simulation and prediction.
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