Rainfall on the Greenland Ice Sheet: Present-day climatology from a high-resolution non-hydrostatic Polar regional climate model

M. Niwano, J.E. Box, A. Wehrlé, B. Vandecrux, W.T. Colgan, J. Cappelen

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

6 Citationer (Scopus)

Abstrakt

Greenland ice sheet rainfall is expected to increase under a warming climate. Yet, there have been no active long-term in-situ rainfall records on the ice sheet due to observational difficulties. Here, we utilize the state-of-the-art 5 km polar non-hydrostatic regional climate model NHM-SMAP to evaluate the ice sheet’s rainfall over 40 years (1980–2019). The largest trends include a fourfold increase in annual rainfall for the northwestern ice sheet; 3.1 Gt year−1 or 12 mm m−2 year−1. September ice-sheet-wide rainfall amount and intensity increase by 7.5 Gt month−1 and 20.8 mm h−1 year−1. In the last two decades, the increasing September maximum hourly rainfall rate exceeded 50 mm h−1 six times. The increased surface water delivery has numerous implications, including for snow metamorphism and ice flow dynamics.

OriginalsprogEngelsk
Artikelnummere2021GL092942
Antal sider11
TidsskriftGeophysical Research Letters
Vol/bind48
Udgave nummer15
DOI
StatusUdgivet - aug. 2021

Programområde

  • Programområde 5: Natur og klima

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