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Recent aircraft and satellite laser altimeter surveys of the Amundsen Sea sector of West Antarctica show that local glaciers are discharging about 250 cubic kilometers of ice per year to the ocean, almost 60% more than is accumulated within their catchment basins. This discharge is sufficient to raise sea level by more than 0.2 millimeters per year. Glacier(More)
[1] Interferometric synthetic-aperture radar data collected by ERS-1/2 and Radarsat-1 satellites show that Antarctic Peninsula glaciers sped up significantly following the collapse of Larsen B ice shelf in 2002. Hektoria, Green and Evans glaciers accelerated eightfold between 2000 and 2003 and decelerated moderately in 2003. Jorum and Crane glaciers(More)
6. Accumulation estimates from recent cores were provided by R. Bales, pending completion of a paper updating the accumulation map for Greenland. 7. C. Davis, personal communication. 8. Values of T north of latitude 70°N shown in Fig. 3 are about 4 cm/year lower than our earlier estimates (2), reflecting improvement in estimates of snow-accumulation rates(More)
Multisensor and multispectral data become increasingly available to the photogrammetric and remote sensing community. These data sets will have a profound impact on the automation of photogrammetric procedures, such as DEM generation and object recognition. In order to study new concepts or to validate algorithms, standard data sets are important. As part(More)
Knowledge of sea ice thickness is critical for the prediction of future climate, and for assessing the significance of changes in thickness. Sea ice thickness can be calculated from radar or laser satellite altimetry measurements of freeboard. However, a lack of knowledge of snow depth introduces significant uncertainties into these calculations. This paper(More)
[1] Satellite radar interferometry data from 1995 to 2004, and airborne ice thickness data from 2002, reveal that the glaciers flowing into former Wordie Ice Shelf, West Antarctic Peninsula, discharge 6.8 ± 0.3 km 3 /yr of ice, which is 84 ± 30 percent larger than a snow accumulation of 3.7 ± 0.8 km 3 /yr over a 6,300 km 2 drainage basin. Airborne and(More)
morphological changes that reflect an earlier automatic response on the part of the plants to the selective pressures of seedbed and harvesting (the adaptive syndrome of domestication) (1, 2, 17). The intact Cucur-bita seeds from the Archaic period occupations of the cave provide evidence, in terms of size increase, that such an adaptive response to seedbed(More)
Recent observations have shown that the periphery of the Greenland ice sheet (GrIS) is thinning rapidly and that this thinning is greatest around marine-terminating outlet glaciers. Several theories have been proposed which provide a link between climate and ice thinning. We present surface elevation change (dh/dt) data from NASA's Program for Arctic(More)
a r t i c l e i n f o Keywords: Satellite altimetry Radar altimeter Laser altimetry Sea ice thickness Snow depth Sea ice thickness is a crucial, but very undersampled cryospheric parameter of fundamental importance for climate modeling. Advances in satellite altimetry have enabled the measurement of sea ice freeboard using satellite microwave altimeters.(More)