Towards More Snow Days in Summer since 2001 at the Great Wall Station,Antarctic Peninsula:The Role of the Amundsen Sea Low  

作　　者：Minghu DING Wei HAN Tong ZHANG Xiaoyuan YUE Jeremy FYKE Ge LIU Cunde XIAO 

机构地区：[1]State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081,China [2]State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [3]Fluid Dynamics and Solid Mechanics Group,Los Alamos National Laboratory,Los Alamos,New Mexico 87545,USA [4]Associated Engineering Group,Ltd,Vernon,British Columbia V1T 9P9,Canada [5]State Key Laboratory of Earth Surface and Resource Ecology,Beijing Normal University,Beijing 100875,China [6]Beijing Meteorological Observation Center,Beijing 100176,China

出　　处：《Advances in Atmospheric Sciences》2020年第5期494-504,共11页大气科学进展（英文版）

基　　金：Strategic Priority Research Program of Chinese Academy of Sciences(XDA20100300);the National Natural Science Foundation of China(Grant No.41771064);the Basic Fund of the Chinese Academy of Meteorological Sciences(Grant Nos.2018Z001 and 2019Z008).

摘　　要：The variation in the precipitation phase in polar regions represents an important indicator of climate change and variability.We studied the precipitation phase at the Great Wall Station and Antarctic Peninsula(AP)region,based on daily precipitation,synoptic records and ERA-Interim data during the austral summers of 1985?2014.Overall,there was no trend in the total precipitation amount or days,but the phase of summer precipitation(rainfall days versus snowfall days)showed opposite trends before and after 2001 at the AP.The total summer rain days/snow days increased/decreased during 1985?2001 and significantly decreased at a rate of?14.13 d(10 yr)?1/increased at a rate of 14.31 d(10 yr)?1 during 2001?2014,agreeing well with corresponding variations in the surface air temperature.Further,we found that the longitudinal location of the Amundsen Sea low(ASL)should account for the change in the precipitation phase since 2001,as it has shown a westward drift after 2001[?41.1°(10 yr)?1],leading to stronger cold southerly winds,colder water vapor flux,and more snow over the AP region during summertime.This study points out a supplementary factor for the climate variation on the AP.

关 键 词：precipitation phase GREAT Wall Station Amundsen Sea LOW 

分 类 号：P941.61[天文地球—自然地理学] P426.6