期刊
GEOPHYSICAL RESEARCH LETTERS
卷 42, 期 14, 页码 5902-5908出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL064349
关键词
Alaska glaciers; tidewater glaciers; mass balance; Operation IceBridge
资金
- NASA [NNX13AD52A, NNX15AG21G, NNX11AF41G]
- U.S. Geological Survey Climate and Land Use Research and Development Program
- Alaska Climate Science Center
- NASA [805121, NNX11AF41G, 146247, NNX13AD52A, NNX15AG21G, 475661] Funding Source: Federal RePORTER
Mountain glaciers comprise a small and widely distributed fraction of the world's terrestrial ice, yet their rapid losses presently drive a large percentage of the cryosphere's contribution to sea level rise. Regional mass balance assessments are challenging over large glacier populations due to remote and rugged geography, variable response of individual glaciers to climate change, and episodic calving losses from tidewater glaciers. In Alaska, we use airborne altimetry from 116 glaciers to estimate a regional mass balance of -75 +/- 11 Gt yr(-1) (1994-2013). Our glacier sample is spatially well distributed, yet pervasive variability in mass balances obscures geospatial and climatic relationships. However, for the first time, these data allow the partitioning of regional mass balance by glacier type. We find that tidewater glaciers are losing mass at substantially slower rates than other glaciers in Alaska and collectively contribute to only 6% of the regional mass loss.
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