Rapid ablation zone expansion amplifies north Greenland mass loss

Brice Noël, Willem Jan van de Berg, Stef Lhermitte, Michiel R. van den Broeke

Research output: Contribution to journalArticleScientificpeer-review

18 Citations (Scopus)
43 Downloads (Pure)

Abstract

Since the early 1990s, the Greenland ice sheet (GrIS) has been losing mass at an accelerating rate, primarily due to enhanced meltwater runoff following atmospheric warming. Here, we show that a pronounced latitudinal contrast exists in the GrIS response to recent warming. The ablation area in north Greenland expanded by 46%, almost twice as much as in the south (+25%), significantly increasing the relative contribution of the north to total GrIS mass loss. This latitudinal contrast originates from a different response to the recent change in large-scale Arctic summertime atmospheric circulation, promoting southwesterly advection of warm air toward the GrIS. In the southwest, persistent high atmospheric pressure reduced cloudiness, increasing runoff through enhanced absorption of solar radiation; in contrast, increased early-summer cloudiness in north Greenland enhanced atmospheric warming through decreased longwave heat loss. This triggered a rapid snowline retreat, causing early bare ice exposure, amplifying northern runoff.

Original languageEnglish
Article numbereaaw0123
Number of pages9
JournalScience Advances
Volume5
Issue number9
DOIs
Publication statusPublished - 2019

Fingerprint Dive into the research topics of 'Rapid ablation zone expansion amplifies north Greenland mass loss'. Together they form a unique fingerprint.

Cite this