Meteorological Drivers and Large-Scale Climate Forcing of West Antarctic Surface Melt

Scott, Ryan C.; Nicolas, Julien P.; Bromwich, David H.; Norris, Joel R.; Lubin, Dan

doi:10.1175/jcli-d-18-0233.1

Title: Meteorological Drivers and Large-Scale Climate Forcing of West Antarctic Surface Melt

Journal Article · Fri Jan 04 00:00:00 EST 2019 · Journal of Climate

DOI:https://doi.org/10.1175/jcli-d-18-0233.1· OSTI ID:1612800

Scott, Ryan C. ^[1]; Nicolas, Julien P. ^[2]; Bromwich, David H. ^[2]; Norris, Joel R. ^[1]; Lubin, Dan ^[1]

The Scripps Research Inst., La Jolla, CA (United States)
The Ohio State Univ., Columbus, OH (United States)

Understanding the drivers of surface melting in West Antarctica is crucial for understanding future ice loss and global sea level rise. This study identifies atmospheric drivers of surface melt on West Antarctic ice shelves and ice sheet margins and relationships with tropical Pacific and high-latitude climate forcing using multidecadal reanalysis and satellite datasets. Physical drivers of ice melt are diagnosed by comparing satellite-observed melt patterns to anomalies of reanalysis near-surface air temperature, winds, and satellite-derived cloud cover, radiative fluxes, and sea ice concentration based on an Antarctic summer synoptic climatology spanning 1979–2017. Summer warming in West Antarctica is favored by Amundsen Sea (AS) blocking activity and a negative phase of the southern annular mode (SAM), which both correlate with El Niño conditions in the tropical Pacific Ocean. Extensive melt events on the Ross–Amundsen sector of the West Antarctic Ice Sheet (WAIS) are linked to persistent, intense AS blocking anticyclones, which force intrusions of marine air over the ice sheet. Surface melting is primarily driven by enhanced downwelling longwave radiation from clouds and a warm, moist atmosphere and by turbulent mixing of sensible heat to the surface by föhn winds. Since the late 1990s, concurrent with ocean-driven WAIS mass loss, summer surface melt occurrence has increased from the Amundsen Sea Embayment to the eastern Ross Ice Shelf. We link this change to increasing anticyclonic advection of marine air into West Antarctica, amplified by increasing air–sea fluxes associated with declining sea ice concentration in the coastal Ross–Amundsen Seas.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0017981

OSTI ID:: 1612800

Journal Information:: Journal of Climate, Vol. 32, Issue 3; ISSN 0894-8755

Publisher:: American Meteorological SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 44 works

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