Abstract
Soil moisture (SM) feedback on climate variables especially temperature is an important aspect in land-atmosphere coupling. Based on the Global Land Data Assimilation System (GLDAS) V2.0 SM data and the gridded observational temperature data, we statistically analyze the thermal feedback of SM over North China (NC). The results show that SM exerts a decreasing trend under the background of evident warming over NC, inducing a decadal enhancement of SM feedbacks on the local temperature and extreme hot events. The SM feedback contributes 6% of the total air temperature variation during 1961–2012, while it reaches 36% after the regional warming during 1994–2012. Such SM affecting temperature is mainly reflected in its feedback on daily maximum temperature, which is also intensified during the warm period. The decadal intensification is also found in the feedback of SM on hot extremes. Further analyses show that the abnormal changes of the latent and sensible heat fluxes caused by the SM anomaly are the main reasons that affect the thermal conditions. Besides, the rising Bowen ratio indicates that upward thermal transfer on the land surface is enhanced in recent years, which suggests that the atmosphere is more sensible to the abnormal heating on the ground. This consequently translates into the decadal intensification of the local thermal feedback of SM in summer over NC.
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Funding
This work was jointly supported by the National Key R&D Program (2016YFA0600702), the National Science Fund for Distinguished Young Scholars (41625019), the National Natural Science Foundation of China (41230422), the China Postdoctoral Science Foundation (2019M651665), the Open Research Fund of the State Key Laboratory of Loess and Quaternary Geology of China (SKLLQG1806), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Xu, B., Chen, H., Gao, C. et al. Decadal intensification of local thermal feedback of summer soil moisture over North China. Theor Appl Climatol 138, 1563–1571 (2019). https://doi.org/10.1007/s00704-019-02918-5
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DOI: https://doi.org/10.1007/s00704-019-02918-5