Analysis of fast ice anomalies and their causes in 2023 in Prydz Bay,East Antarctica  

作　　者：Jun-Hao LIU Xin-Qing LI Shao-Yin WANG Zi-Xin WEI Feng-Ming HUI Xiao CHENG 

机构地区：[1]School of Geospatial Engineering and Science,Sun Yat-sen University,Zhuhai 519082,China [2]Key Laboratory of Comprehensive Obseration of Polar Envionment(Sun Yat-sen University),Minitry of Education,Zhuhai 982,China [3]Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China

出　　处：《Advances in Climate Change Research》2024年第5期784-797,共14页气候变化研究进展（英文版）

基　　金：supported by the National Natural Science Foundation of China(41925027,42206248).

摘　　要：In 2023,Antarctica experienced its lowest sea ice extent in the satellite era,with extreme polar events gaining widespread attention.Prydz Bay,where the Chinese Zhongshan Station is located,is the third largest embayment in Antarctica.Changes in sea ice,fast ice and polynyas directly affect local heat and mass exchanges between the ocean and atmosphere,as well as ecosystems and research activities.In 2023,substantial fast ice anomalies were observed in Prydz Bay:the extent of fast ice off Zhongshan Station(ZSFI)was anomalously low,while that within Barrier Bay(BaFI)was anomalously high.This study analysed the seasonal evolution and underlying main causes for the extreme conditions using ice charts,satellites and reanalysis data.From 2014 to 2022,the extent of zSFI typically increased during the cold season,reaching a maximum of(9.41±2.47)×10^(3) km^(2),whilst the Barrier Bay Polynya(BaP)persisted throughout this period.However,in 2023,ZSFI did not increase from June onwards,peaking at a maximum extent of only 5.49×10^(3) km^(2),and the BaP closed in mid-winter,leading to the formation of extensive BaFI.Air temperature and wind speed continuously dropped in July,and these conditions persisted for approximately 1 month,leading to the closure of BaP.However,zSFI did not expand further under these extreme meteorological conditions,indicating its independence from these factors.The limited expansion of ZSFI could be attributed to high ocean temperatures.Overall,this study provides valuable insights into the mechanisms driving extreme fast ice conditions.

关 键 词：Fast ice Prydz Bay Atmospheric circulation Southern ocean warming 

分 类 号：P731[天文地球—海洋科学]