• CN 62-1175/P
• ISSN 1006-7639

Journal of Arid Meteorology ›› 2021, Vol. 39 ›› Issue (3): 374-385.

### A Study of Spatial and Temporal Distribution of Land Atmosphere Coupling Strength in China

YANG Yang1, YANG Qidong2, WANG Zhilan1, GAO Lu2

1. 1. Institute of Arid Meteorology, CMA, Lanzhou 730020, China; 2. Department of Atmosphere
Science, School of Earth Sciences, Yunnan University, Kunming 650500, China
• Online:2021-06-30 Published:2021-07-16

### 中国区域陆气耦合强度的时空分布特征

1. 1.中国气象局兰州干旱气象研究所，甘肃兰州730020；
2.云南大学大气科学系，云南昆明650500

Abstract: The land-atmosphere coupling (LAC) strength can be used to characterize how the land surface influences precipitation, temperature or other atmospheric physical processes, and can be used to identify the hotspot of land-atmosphere interactions, which can deepen the understanding of landatmosphere interaction and climate system. In order to quantify the LAC strength in China, the spatial-temporal distribution characteristics of the LAC index of soil moisturelatent heat flux and latent heat flux-lifting condensation level, the Pearson and Kendall’s Tau correlation of soil moisturetemperature and soil moistureprecipitation were analyzed by using ERA5 reanalysis data. The results are as follows: (1) The latent heat flux increased with soil moisture increasing, providing water vapor for precipitation. The increase in latent heat flux led to the decrease of sensible heat flux, then temperature decreased, which weakened the drive of boundary layer and was not conducive to the uplift and condensation of air mass over arid and semiarid areas of northern China. This region was a hotspot of landatmosphere interaction in China. (2) There were obvious seasonal differences in LAC strength in China. The LAC strength over arid and semiarid regions was stronger in spring and summer, but weaker in autumn and winter. The soil was relatively dry in dry season over southwest China where LAC was significant. For landatmosphere coupling, we should not only consider the division of traditional climate zones, but also ponder the influence of rain belt dynamic changes.
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