本字幕由TME AI技术生成

accordingtoscientistsfromthenationalsnowiceedatataandnasasaarcticciceappearstohavereacheditsminimumfortheyearatnearlyonepointsevenmillionsquaremilesachillingfact

consideringthatthisisonlyabouttenpercentmorethanthelowestminimumeverrecordedinseptemberoflastyear

thelevelsofperennialoryearroundcicehavebeendroppingrapidlyaccordingthenasa

thedropinicelevelsofaveragenearlytenpercent

eachdecadesincenasabegansatelliteimaginginonehundredandseventyninebetweenthewintersoftwothousandfiveandtwothousandseven

theamountofperennializedthatwaslost

wasequivalentintoanareaofasizeoftexasandcaliforniacombinedwhileperennialCSusedtocoveruptosixtypercentofthearctic

itnowonlycoversaboutthirtypercent

perennialciceisthethitguys

thatremainssolidthroughouttheyear

andprovidesimporthabitatandhuntinggroundsforpolarbears

whilethesurroundingseasonalizedmeltsandreformeachyear

thisdatafurtherreinforcespreviousevidencethattheminimumlevelofperennialciceinthearcticisdroppingyearlyeveryyearanarcticclimateexpertofthenationalsnowandicedatacenter

tertelfnationalgeographicnews

theiceisinadeathspiral

marxterredsays

arcticsummarizecouldbecompletelylostbytheyear

twentythirty

thedropoffinseascanhaveglobalramificationsbothonlandandinthewater

ciceworksasamirror

reflectingthesunsrays

themorecicethatexiststhemorethesunsraysarereflectedofftheearthssurface

butwhenciceleveldeclinemoreofthesunsrayscanbeabsorbedbytheseasandbyislandiscommmenallytoariseinglobaltemperaturesanddisruptthefragileequilibriumoftheworlds

climateworseyet

thiscanresultinwhatscientistscallicelllbetofeedbackmeaningthemorethecicedeclinesthemorelikelyitllcontinuetodecline