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Land-ice elevation changes from photon-counting swath altimetry: first applications over the Antarctic ice sheet


Young, DA and Lindzey, LE and Blankenship, DD and Greenbaum, JS and Garcia de Gorordo, A and Kempf, SD and Roberts, JL and Warner, RC and van Ommen, T and Siegert, MJ and Le Meur, E, Land-ice elevation changes from photon-counting swath altimetry: first applications over the Antarctic ice sheet, Journal of Glaciology, 61, (225) pp. 17-28. ISSN 0022-1430 (2015) [Refereed Article]

DOI: doi:10.3189/2015JoG14J048


Satellite altimetric time series allow high-precision monitoring of ice-sheet mass balance. Understanding elevation changes in these regions is important because outlet glaciers along ice-sheet margins are critical in controlling flow of inland ice. Here we discuss a new airborne altimetry dataset collected as part of the ICECAP (International Collaborative Exploration of the Cryosphere by Airborne Profiling) project over East Antarctica. Using the ALAMO (Airborne Laser Altimeter with Mapping Optics) system of a scanning photon-counting lidar combined with a laser altimeter, we extend the 200309 surface elevation record of NASA's ICESat satellite, by determining cross-track slope and thus independently correcting for ICESat's cross-track pointing errors. In areas of high slope, cross-track errors result in measured elevation change that combines surface slope and the actual Δzt signal. Slope corrections are particularly important in coastal ice streams, which often exhibit both rapidly changing elevations and high surface slopes. As a test case (assuming that surface slopes do not change significantly) we observe a lack of ice dynamic change at Cook Ice Shelf, while significant thinning occurred at Totten and Denman Glaciers during 200309.

Item Details

Item Type:Refereed Article
Keywords:aerogeophysical measurements, Antarctic glaciology, glacier mapping, glaciological instruments and methods, ice-sheet mass balance
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Antarctic and Southern Ocean oceanic processes
UTAS Author:Roberts, JL (Dr Jason Roberts)
UTAS Author:Warner, RC (Dr Roland Warner)
UTAS Author:van Ommen, T (Dr Tas van Ommen)
ID Code:100450
Year Published:2015
Web of Science® Times Cited:18
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2015-05-18
Last Modified:2017-10-30

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