Impacts of Mid-High Latitude Cyclones in the Southern Hemisphere on Antarctic Sea Ice Extent
Chen Lei
Huang Yu
Li Shuanglin
Xu Xiangde
Abstract：The long-term effects of mid-high latitude cyclones on Antarctic sea ice extent(SIE)were investigated using reanalysis data from European Center for Medium-Range Weather Forecasts(ECMWF)for September,spanning from 1979 to 2022.This study examines the correlation between the frequency of mid-high latitude cyclones and SIE,as well as analyzes the spatiotemporal distribution of SIE anomalies caused by cyclones.The results indicate that the mid-high latitude cyclones predominantly influence Antarctic sea ice within the marginal ice zone,where the sea ice concentration(SIC)is less than 80％and exhibits frequent changes across most regions.These findings reveal that SIE is more susceptible to Southern Annular Mode(SAM)than to cyclones in most regions of Antarctica.However,cyclone-induced variations in SIC are significant within the Antarctic marginal ice zone,particularly near the sea ice edges,where cyclones are the primary drivers of SIC fluctuations.The influence of cyclones on SIC variations depends on the initial SIC amount,with variations decreasing as SIC reaches a certain high value.
Keywords：Southern Hemispheremid-high latitude cycloneAntarcticasea icemeteorology
Publication Date：2025-09-30
Online Publishing Date：2025-10-15(First online date of this platform, not the publication date of the document)
Pages：13( 3395-3407 )