本字幕由TME AI技术生成
嗯
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