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Advantage of Diurnal Amplitude Variation (DAV) of Brightness Temperature in Revealing the Land-Atmosphere Interaction Over the Region of Frozen and Thawed Soil in the Northern Hemisphere During the Cold Wave Movements

文献类型： 外文期刊

作者： Hu, Yin 1 ; Lv, Shaoning 1 ; Guo, Yuanyuan 1 ; Bai, Haihua 6 ; Dorjsuren, Altanchimeg 7 ; Zhang, Yijun 1 ; Wen, Jun 8 ;

作者机构： 1.Fudan Univ, Dept Atmospher & Ocean Sci, Shanghai, Peoples R China

2.Fudan Univ, Inst Atmospher Sci, Shanghai, Peoples R China

3.Zhuhai Fudan Innovat Res Inst, Zhuhai, Peoples R China

4.Shanghai Key Lab Oceanland Atmosphere Boundary Dyn, Shanghai, Peoples R China

5.Fudan Univ, Key Lab Polar Atmosphere OceanIce Syst Weather & C, Minist Educ, Shanghai, Peoples R China

6.Chinese Acad Agr Sci, Inst Grassland Res, Hohhot, Peoples R China

7.Mongolian Acad Sci, Inst Biol, Dept Entomol, Ulaanbaatar, Mongolia

8.Chengdu Univ Informat Technol, Sch Atmospher Sci, Plateau Atmosphere & Environm Key Lab Sichuan Prov, Chengdu, Peoples R China

期刊名称：GEOPHYSICAL RESEARCH LETTERS （ 影响因子：4.6； 五年影响因子：5.1 ）

ISSN： 0094-8276

年卷期： 2025 年 52 卷 13 期

页码：

收录情况： SCI

摘要： During cold wave movements, land-atmosphere interaction functions as a "switch" mechanism, regulating energy and moisture exchange. However, existing methods have limitations in capturing this process. The dielectric contrast between frozen and thawed soil induces diurnal amplitude variation (DAV) in brightness temperature at L-band, providing a basis for tracking land-atmosphere interactions. Our study shows that DAV effectively captures cold air masses' origin and seasonal movement. During a cold wave, its phase relationship with air and soil temperatures falls into four categories: precedes (-1.1 to -0.6 days), lags (0.71-0.98 days), in between (-0.62 to 0.34 days), and synchronized. Moreover, DAV lags air temperature in 63% of cases and precedes soil temperature in 59%, consistently fluctuating within their overlap region. This suggests DAV is a more direct indicator of freeze-thaw, reflecting the conditions at the atmosphere-land interface.

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