Changes in China's Snow Droughts Characteristics From 1993 to 2019

Guan，Yanlong1,2; Liu，Junguo2,3,4; Li，Delong5; Dou，Yuehan6; Chen，Penghan2; Zhang，Chongyang7; Jiang，Yelin8; Chen，He2; Chen，Aifang2; Maeda，Eduardo Eiji9,10

2024-01-28

10.1029/2023JD039297

Journal of Geophysical Research: Atmospheres   影响因子和分区

2169-897X

2169-8996

Snowpacks are natural water reservoirs providing a considerable amount of water for humans and ecosystems. However, current global snow products (e.g., ESA GlobSnow v3.0), lack high spatial resolution and regional calibrations necessary to capture the high heterogeneity of snow water equivalents (SWEs) in complex Asian mountainous terrains. Therefore, our understanding of snow drought characteristics in China remains limited. Herein, we used an improved SWE product calibrated specifically for China to explore the characteristics of snow droughts, delineated by a standardized SWE index (SWEI) between 1993 and 2019. Our analysis was focused over three main snow-covered regions of China: Qinghai–Tibet Plateau (QTP), northern Xinjiang, Northeast China. Especially during the period from 1993 to 2010, we found that the SWEI increased significantly at rates of 0.022/yr (Northeast China), 0.017/yr (northern Xinjiang), and 0.011/yr (QTP) (p < 0.01, Mann-Kendall trend test). Increased SWEI contributed to decreasing snow drought events across China, with an obvious short-term characteristic, whilst area proportion of the identified 1-month snow droughts was above 46.5% across three regions. Furthermore, we found that the occurrence of snow droughts was likely mediated by large-scale atmospheric circulation, since increased water vapor transport caused a significant vapor flux convergence in cold seasons over three regions, especially in northern Xinjiang and Northeast China.

SCI

英语

通讯

GEOSCIENCES

2-s2.0-85182838965

Scopus

1.College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou,China
2.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,China
3.School of Water Conservancy,North China University of Water Resource and Electric Power,Zhengzhou,China
4.Henan Provincial Key Lab of Hydrosphere and Watershed Water Security,North China University of Water Resources and Electric Power,Zhengzhou,China
5.Institute of Geographic Science and Natural Resources Research,Chinese Academy of Science,Beijing,China
6.Department of Health and Environmental Sciences,Xi'an Jiaotong-Liverpool University,Suzhou,China
7.College of Atmospheric Sciences,Lanzhou University,Lanzhou,China
8.Division of Ocean & Climate Physics,Lamont-Doherty Earth Observatory,Columbia University,New York,United States
9.Department of Geosciences and Geography,University of Helsinki,Helsinki,Finland
10.Finnish Meteorological Institute,Helsinki,Finland

Guan，Yanlong,Liu，Junguo,Li，Delong,et al. Changes in China's Snow Droughts Characteristics From 1993 to 2019[J]. Journal of Geophysical Research: Atmospheres,2024,129(2).

Guan，Yanlong.,Liu，Junguo.,Li，Delong.,Dou，Yuehan.,Chen，Penghan.,...&Maeda，Eduardo Eiji.(2024).Changes in China's Snow Droughts Characteristics From 1993 to 2019.Journal of Geophysical Research: Atmospheres,129(2).

Guan，Yanlong,et al."Changes in China's Snow Droughts Characteristics From 1993 to 2019".Journal of Geophysical Research: Atmospheres 129.2(2024).