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Understanding the soil Temperature Variability at Different Depths:Effects of Surface Air Temperature,Snow Cover,and the soil memory

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Advances in Atmospheric Sciences 2021年第3期38卷 493-503页

作者： Haoxin ZHANG Naiming YUAN Zhuguo MA Yu HUANG Key Laboratory of Regional−Climate Environment Research for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China Laboratory for Climate and Ocean−Atmosphere Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking UniversityBeijing 100871China School of Atmospheric Sciences Sun Yat-sen UniversityZhuhai 519082China

The soil temperature(ST)is closely related to the surface air temperature(AT),but their coupling may be affected by other factors.In this study,significant effects of the AT on the underlying ST were found,and the time taken to propagate downward to 320 cm can be up to 10 months.Besides the AT,the ST is also affected by memory effects-namely,its prior thermal conditions.At deeper depth(i.e.,320 cm),the effects of the AT from a particular season may be exceeded by the soil memory effects from the last season.At shallower layers(i.e.,<80 cm),the effects of the AT may be blocked by the snow cover,resulting in a poorly synchronous correlation between the AT and the ST.In northeastern China,this snow cover blockage mainly occurs in winter and then vanishes in the subsequent spring.Due to the thermal insulation effect of the snow cover,the winter ST at layers above 80 cm in northeastern China were found to continue to increase even during the recent global warming hiatus period.These findings may be instructive for better understanding ST variations,as well as land−atmosphere interactions.

关键词： soil temperature surface air temperature soil memory snow cover nonlinear causality analysis

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