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Open AccessArticle

Coupling of Soil Moisture and Air Temperature from Multiyear Data During 1980–2013 over China

Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, School of Geographical Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, China
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Atmosphere 2020, 11(1), 25; https://doi.org/10.3390/atmos11010025
Received: 28 November 2019 / Revised: 20 December 2019 / Accepted: 24 December 2019 / Published: 26 December 2019
(This article belongs to the Special Issue Climate Change, Climatic Extremes, and Human Societies in the Past)
Soil moisture is an important parameter in land surface processes, which can control the surface energy and water budgets and thus affect the air temperature. Studying the coupling between soil moisture and air temperature is of vital importance for forecasting climate change. This study evaluates this coupling over China from 1980–2013 by using an energy-based diagnostic method, which represents the momentum, heat, and water conservation equations in the atmosphere, while the contributions of soil moisture are treated as external forcing. The results showed that the soil moisture–temperature coupling is strongest in the transitional climate zones between wet and dry climates, which here includes Northeast China and part of the Tibetan Plateau from a viewpoint of annual average. Furthermore, the soil moisture–temperature coupling was found to be stronger in spring than in the other seasons over China, and over different typical climatic zones, it also varied greatly in different seasons. We conducted two case studies (the heatwaves of 2013 in Southeast China and 2009 in North China) to understand the impact of soil moisture–temperature coupling during heatwaves. The results indicated that over areas with soil moisture deficit and temperature anomalies, the coupling strength intensified. This suggests that soil moisture deficits could lead to enhanced heat anomalies, and thus, result in enhanced soil moisture coupling with temperature. This demonstrates the importance of soil moisture and the need to thoroughly study it and its role within the land–atmosphere interaction and the climate on the whole. View Full-Text
Keywords: soil moisture–temperature coupling; heatwaves; multiple time scales soil moisture–temperature coupling; heatwaves; multiple time scales
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Yuan, Q.; Wang, G.; Zhu, C.; Lou, D.; Hagan, D.F.T.; Ma, X.; Zhan, M. Coupling of Soil Moisture and Air Temperature from Multiyear Data During 1980–2013 over China. Atmosphere 2020, 11, 25.

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