The polar regions in a 2°C warmer world.

Abstract:

:Over the past decade, the Arctic has warmed by 0.75°C, far outpacing the global average, while Antarctic temperatures have remained comparatively stable. As Earth approaches 2°C warming, the Arctic and Antarctic may reach 4°C and 2°C mean annual warming, and 7°C and 3°C winter warming, respectively. Expected consequences of increased Arctic warming include ongoing loss of land and sea ice, threats to wildlife and traditional human livelihoods, increased methane emissions, and extreme weather at lower latitudes. With low biodiversity, Antarctic ecosystems may be vulnerable to state shifts and species invasions. Land ice loss in both regions will contribute substantially to global sea level rise, with up to 3 m rise possible if certain thresholds are crossed. Mitigation efforts can slow or reduce warming, but without them northern high latitude warming may accelerate in the next two to four decades. International cooperation will be crucial to foreseeing and adapting to expected changes.

journal_name

Sci Adv

journal_title

Science advances

authors

Post E,Alley RB,Christensen TR,Macias-Fauria M,Forbes BC,Gooseff MN,Iler A,Kerby JT,Laidre KL,Mann ME,Olofsson J,Stroeve JC,Ulmer F,Virginia RA,Wang M

doi

10.1126/sciadv.aaw9883

subject

Has Abstract

pub_date

2019-12-04 00:00:00

pages

eaaw9883

issue

12

issn

2375-2548

pii

aaw9883

journal_volume

5

pub_type

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