Influence of Soil Moisture on Surface Air Temperature in Monsoons

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2025-10-16 DOI:10.1029/2025GL115760

Yuhei Takaya, Naresh G. Ganeshi, Yu Kosaka, X. San Liang, Tomonori Sato

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Abstract

Land plays a pivotal role in modulating weather and climate in monsoon regions, yet our understanding of land–atmosphere interactions remains incomplete. Here we present the information-theoretic causal analysis, the Liang-Kleeman information flow, for quantifying the strength of soil moisture (SM) influence on surface air temperature (SAT). We revealed that SM exerts significant influence on SAT across monsoon regions, intricately linked to the seasonal monsoon cycle. Notably, prominent influence of SM on SAT was found, even under typical wet conditions in the tropics when intense solar radiation is present. Furthermore, this study highlights a strong connection between land desiccation and the occurrence of hot days in pre-monsoon periods. The proposed measure of SM influence strength enhances our understanding of land–atmosphere interactions and provides new insights into seasonally evolving predictability arising from SM variability across monsoon systems.

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季风期土壤水分对地表气温的影响

陆地在调节季风区的天气和气候方面起着关键作用，但我们对陆地-大气相互作用的理解仍然不完整。在这里，我们提出了信息理论的因果分析，即Liang - Kleeman信息流，用于量化土壤湿度（SM）对地表气温（SAT）的影响强度。我们发现，季风对整个季风区的SAT有显著影响，与季节性季风周期有着复杂的联系。值得注意的是，即使在存在强烈太阳辐射的热带地区典型潮湿条件下，也发现了SM对SAT的显著影响。此外，这项研究强调了季风前期土地干燥与炎热天气之间的密切联系。提出的SM影响强度测量增强了我们对陆地-大气相互作用的理解，并为季风系统中SM变率引起的季节演变可预测性提供了新的见解。

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.