Greenland Surface Melt Dominated by Solar and Sensible Heating
Journal Article
·
· Geophysical Research Letters
- University of California, Irvine, CA (United States); Univ. of California, Irvine, CA (United States)
- University of California, Irvine, CA (United States)
- Geological Survey of Denmark and Greenland (GEUS), Copenhagen (Denmark)
The Greenland Ice Sheet is the primary source of global Barystatic sea-level rise, and at least half of its recent mass-loss acceleration is caused by surface meltwater runoff. Previous studies on surface melt have examined various thermodynamic and dynamic drivers, yet their contributions are not compared using unified observations. We use decade-long in-situ measurements from automatic weather stations throughout the ablation zone to assess energy components and identify the leading physical processes in this area. Large melt events exceeding 3σ contribute only ~2% to total surface melt since 2007. The day-to-day variability of all melt is dominated by sensible heat exchange (31 ± 7%) and shortwave radiation (28 ± 5%). Sensible and solar heating correlate with the occurrence of dry and fast gravity-driven winds. These katabatic winds increase sensible heating of the surface mainly by enhancing vertical mixing that reduces the temperature inversion. The concomitant low humidity and clear skies yield increased solar heating.
- Research Organization:
- University of California, Irvine, CA (United States); University of Michigan, Ann Arbor, MI (United States)
- Sponsoring Organization:
- National And Aeronautics Space Administration (NASA); National Science Foundation (NSF); USDOE; USDOE Office of Science (SC)
- Grant/Contract Number:
- SC0019278
- OSTI ID:
- 1853005
- Alternate ID(s):
- OSTI ID: 1775557
- Journal Information:
- Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 7 Vol. 48; ISSN 0094-8276
- Publisher:
- American Geophysical Union (AGU)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Clouds enhance Greenland ice sheet meltwater runoff
Wind‐Associated Melt Trends and Contrasts Between the Greenland and Antarctic Ice Sheets
Journal Article
·
Mon Jan 11 19:00:00 EST 2016
· Nature Communications
·
OSTI ID:1623821
Wind‐Associated Melt Trends and Contrasts Between the Greenland and Antarctic Ice Sheets
Journal Article
·
Mon Aug 28 20:00:00 EDT 2023
· Geophysical Research Letters
·
OSTI ID:2421094