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|a Time-variable gravity observations of ice sheet mass balance |h [electronic resource] |b precision and limitations of the GRACE satellite data. |
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|a [S.l.] : |b American Geophysical Union, |c 2013. |
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|a American Geophysical Union. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights.
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|a Tie-variable gravity data from the Gravity Recovery And Climate Experiment (GRACE) mission have been available since 2002 to estimate the mass balance of the Greenland and Antarctic
Ice Sheets. We analyze current progress and uncertainties in GRACE estimates of ice sheet mass balance. We discuss the impacts of errors associated with spherical harmonic truncation, spatial averaging, temporal sampling, and leakage from other time-dependent signals (e.g. Glacial Isostatic Adjustment (GIA)). The largest sources of error for Antarctica are the GIA correction, the omission of l=1 terms, non-tidal changes in ocean mass, and measurement errors. For Green-
land, the errors come mostly from the uncertainty in the scaling factor. Using Release 5.0 (RL05) GRACE finds for Jan 2003 through Nov 2012, we find a mass change of -258 ACK 41 Gt/yr for Greenland, with an acceleration of -31 ACK 6 Gt/yr2, and a loss that migrated clockwise around the ice sheet margin to progressively affect the entire periphery. For Antarctica, we report changes of -83 ACK 49 and -147 ACK 80 Gt/yr for two GIA models, with an acceleration of -12 ACK 9 Gt/yr2 and a dominance from the southeast pacific sector of West Antarctica and the Antarctic Peninsula. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15062071/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/20/71/00001/FI15062071thm.jpg |
