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

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

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3220501t&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 20, CiteID L20501

Physics

27

Cryosphere: Glaciers, Cryosphere: Mass Balance (1218, 1223), Geodesy And Gravity: Time Variable Gravity (7223, 7230), Geodesy And Gravity: Global Change From Geodesy (1222, 1622, 1630, 1641, 1645, 4556), Global Change: Sea Level Change (1222, 1225, 4556)

Scientific paper

Watersheds 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.

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