Quantitative Assessment of the Influences of Snow Drought on Forest and Grass Growth in Mid-High Latitude Regions by Using Remote Sensing  
[PERSON]  
1 Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing 100875, China; [EMAIL_ADDRESS] (H.L. ); [EMAIL_ADDRESS] (X.W. ); [EMAIL_ADDRESS] (S.Y. ); [EMAIL_ADDRESS] (P.W).1 Beijing Weather Modification Office, Beijing 100089, China; [EMAIL_ADDRESS] 1  
[PERSON]  
1 Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing 100875, China; [EMAIL_ADDRESS] (H.L. ); [EMAIL_ADDRESS] (X.W. ); [EMAIL_ADDRESS] (S.Y. ); [EMAIL_ADDRESS] (P.W).1 Beijing Weather Modification Office, Beijing 100089, China; [EMAIL_ADDRESS] 1  
[PERSON]  
2 Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing 100875, China; [EMAIL_ADDRESS] 2  
[PERSON]  
1 Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing 100875, China; [EMAIL_ADDRESS] (H.L. ); [EMAIL_ADDRESS] (X.W. ); [EMAIL_ADDRESS] (S.Y. ); [EMAIL_ADDRESS] (P.W).1 Beijing Weather Modification Office, Beijing 100089, China; [EMAIL_ADDRESS] 1  
[PERSON]  
4 Ministry of Ecology and Environment Center for Satellite Application on Ecology and Environment, Beijing 100094, China 4  
[PERSON]  
1 Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing 100875, China; [EMAIL_ADDRESS] (H.L. ); [EMAIL_ADDRESS] (X.W. ); [EMAIL_ADDRESS] (S.Y. ); [EMAIL_ADDRESS] (P.W).1 Beijing Weather Modification Office, Beijing 100089, China; [EMAIL_ADDRESS] 1  
[PERSON]  
5 Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities, State Key Laboratory of Remote Sensing Science, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China; guanyabing@mail.bnu. to cold air to cut down the availability of deeper and shallow soil water in the following growing season and thereby affect the plant input water [7]. In mid-high or high latitude regions, drought winter with less precipitation also means less snowfall. Increasing research has provided evidence that snow accumulation in mid-high latitude areas has decreased as a result of increasing temperatures in the context of global climate change [2; 8; 9]. In addition, the climate is typically the first-order control in the snow flow region [10]. This situation will cause snow drought, i.e., a lack of snow accumulation in winter [11], which brings severe socioeconomic consequences to humans and negative influences on the ecosystem. According to different climatic causes, snow drought is divided into dry snow drought and warm snow drought. Dry snow drought is caused by winter precipitation deficits, while warm snow drought is induced by above-normal winter temperatures [1]. Warm snow drought reduces the annual flood peak [12] and increases flood risks due to rain sticking together with snowfall [13; 14]. Annual runoff also decreases because of the snow drought and its negative impact on water quantity and quality [15; 16]. Even worse, insufficient snow accumulation brings earlier snow disappearance, which is tied to increased wildfire activity [17] and tree mortality [18], as well as greater stress for mountain ecosystems [19]. Previous studies have paid more attention to distinguishing warm snow drought and the variation of winter, spring and annual hydrological processes caused by insufficient snow accumulation. [PERSON] et al. [20] showed that exceptionally warm winter conditions induced snow drought in California, Oregon, and Washington during the record-low snow season in 2015. [PERSON] et al. [14] labeled the 2015 year in the Pacific Northwest as a warm snow drought.