The relationship between spring soil moisture and summer hot extremes over North China
The relationship between spring soil moisture and summer hot extremes over North China
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DOI：
10.1007/s00376-015-5003-0
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发表时间：
2015-10
影响因子：
5.8
通讯作者：
Lingyun Wu;Jingyong Zhang
中科院分区：
文献类型：
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作者：
Lingyun Wu;Jingyong Zhang
据了解，极端高温事件的增加对人类社会和生态系统造成了严重后果。然而，我们季节性预测极端高温的能力仍然很差，这主要是由于我们对缓慢演变的地球系统成分（如土壤湿度）及其与气候的相互作用的了解有限。本文以华北地区为研究对象，利用1981-2008年全球陆地数据同化系统（GLS）的土壤湿度资料和观测温度资料，研究了春季土壤湿度状况与夏季极端高温的关系。结果表明，华北地区春季局地土壤水分状况与夏季高温日数和夏季热浪关系密切，占总方差的19%~ 34%。春季土壤水分异常可以持续到夏季，并随后改变潜热和感热通量，从而对夏季极端高温有显着影响。研究结果表明，春季土壤水分状况可以作为华北地区夏季高温日数和热浪的预测因子。
The increase in the occurrence of hot extremes is known to have resulted in serious consequences for human society and ecosystems. However, our ability to seasonally predict hot extremes remains poor, largely due to our limited understanding of slowly evolving earth system components such as soil moisture, and their interactions with climate. In this study, we focus on North China, and investigate the relationship of the spring soil moisture condition to summer hot extremes using soil moisture data from the Global Land Data Assimilation System and observational temperature for the period 1981–2008. It is found that local soil moisture condition in spring is closely linked to summer hot days and heat waves over North China, accounting for 19%–34% of the total variances. Spring soil moisture anomalies can persist to the summer season, and subsequently alter latent and sensible heat fluxes, thus having significant effects on summer hot extremes. Our findings indicate that the spring soil moisture condition can be a useful predictor for summer hot days and heat waves over North China.