Constraining hydrological and cryospheric mass flux in southeastern Alaska using space-based gravity measurements

Edited: 2011-02-21
TitleConstraining hydrological and cryospheric mass flux in southeastern Alaska using space-based gravity measurements
Publication TypeJournal Article
Year of Publication2005
AuthorsTamisiea, M., E. W. Leuliette, J. Davis, and J. Mitrovica
JournalGeophysical Research Letters
Volume32
Pagination20501
Date Published10/2005
Keywordsclimate, grace, ice, sea_level
AbstractWatersheds draining into the Gulf of Alaska (GoA) experience large seasonal and inter-annual variations of water in the form of rain, snow, and ice, but accurate constraints on these variations have been difficult to obtain. Over larger geographic regions, water variations can be inferred directly from the Gravity Recovery and Climate Experiment (GRACE) data. However, because GoA variations occur over such a small region, the inferred average value of water flux increases as the applied smoothing of the GRACE data decreases. We use this observed scaling together with scaling results obtained from forward models to infer a seasonal amplitude of 115 +/- 20 km3 of water and an average contribution to sea level rise over the two years of data of 0.31 +/- 0.09 mm/yr. These results suggest that accelerated melting that began in the late 1990s, as inferred from altimetry, continues unabated.
URLhttp://adsabs.harvard.edu/abs/2005GeoRL..3220501T
DOI10.1029/2005GL023961