极地研究2025，Vol.37Issue(4)：668-680,13.DOI:10.13679/j.jdyj.20240054
基于多源遥感数据的东南极达尔克冰架月尺度动态监测
Monthly dynamic monitoring of the Dalk Ice Shelf based on multisource re-mote sensing data
摘要
Abstract
Monthly measurements of ice shelf area and exploration of the spatiotemporal characteristics and fac-tors influencing ice shelf extent improve our understanding of the mechanisms of ice shelf collapse.This study uses visual interpretation,coastline transition algorithms,and optical and synthetic aperture radar re-mote sensing images to extract data on ice shelf extent over the 284 months from January 2000 to August 2023.The periodic and seasonal characteristics of ice shelf area were examined.The influence of the Oce-anic Niño index(ONI),the Southern Annular Mode(SAM),sea ice concentration(SIC),and sea surface temperature(SST)on ice shelf extent was analyzed.The results show that:(1)during the 24 years of the study period,the Dalk Ice Shelf experienced six"forward rapid retreat"cycles,each accompanied by strong El Niño or La Niña events.At the end of each cycle,the front edge of the ice shelf retreated to the area dominated by ice ridges with prominent topographical variations.(2)The retreat of the Dalk Ice Shelf ex-hibited clear seasonality.Retreat area was the largest in summer with maxima in March.In 2016,a strong El Niño year,the ice shelf experienced an abnormally rapid collapse event in winter.(3)Ice shelf area is sig-nificantly negatively correlated with SST(r=-0.35,p<0.01)and the magnitude of the correlation coefficient is modest.Ice shelf area is positively correlated with the SAM(r=0.26,p<0.01)with a small correlation co-efficient.It is positively correlated with SIC(r=0.57,p<0.01)with a large coefficient.It is also positively correlated with the ONI(r=0.68,p<0.01).关键词
达尔克冰架/冰架范围变化/影响因素/响应机制Key words
Dalk Ice Shelf/changes in ice shelf range/influencing factors/response mechanism引用本文复制引用
贾鹏,刘岩,翁志龙,程晓..基于多源遥感数据的东南极达尔克冰架月尺度动态监测[J].极地研究,2025,37(4):668-680,13.基金项目
国家自然科学基金(42276246、41925027)资助 （42276246、41925027）
