Improved ice loss estimate of the northwestern Greenland Ice Sheet
Research output: Contribution to journal › Journal article › Research › peer-review
Standard
Improved ice loss estimate of the northwestern Greenland Ice Sheet. / Kjeldsen, Kristian Kjellerup; Khan, Shfaqat Abbas; Wahr, John; Korsgaard, Niels Jákup; Kjær, Kurt H.; Bjørk, Anders Anker; Hurkmans, Ruud; van den Broeke, Michiel R.; Bamber, Jonathan L; van Angelen, Jan H.
In: Journal of Geophysical Research: Solid Earth, Vol. 118, No. 2, 11.02.2013, p. 698–708.Research output: Contribution to journal › Journal article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Improved ice loss estimate of the northwestern Greenland Ice Sheet
AU - Kjeldsen, Kristian Kjellerup
AU - Khan, Shfaqat Abbas
AU - Wahr, John
AU - Korsgaard, Niels Jákup
AU - Kjær, Kurt H.
AU - Bjørk, Anders Anker
AU - Hurkmans, Ruud
AU - van den Broeke, Michiel R.
AU - Bamber, Jonathan L
AU - van Angelen, Jan H.
PY - 2013/2/11
Y1 - 2013/2/11
N2 - 2003-2009 using Ice, Cloud and land Elevation Satellite (ICESat) laser altimeter data [Zwally et al., 2011]. Elevation changes are often reported to be largest near the frontal portion of outlet glaciers. To improve the volume change estimate, we supplement the ICESat data with altimeter surveys from NASA’s Airborne Topographic Mapper (ATM) from 2002-2010 [Krabill et al., 2011] and NASAs Land, Vegetation and Ice Sensor (LVIS) from 2010 [Blair and Hofton, 2010]. The airborne data are mainly concentrated along the ice margin and thus have a significant impact on the estimate of the volume change. Our results show that adding ATM and LVIS data to the ICESat data increases the catchment-wide estimate of ice volume loss by 11 percent, mainly due to an improved volume loss estimate along the ice sheet margin. Furthermore, our results show a significant acceleration in mass loss at elevations above 1200 m. Both the improved mass loss estimate along the ice sheet margin and the acceleration at higher elevations have implications for predictions of the elastic adjustment of the lithosphere caused by present-day ice mass changes. Our study shows that the use of ICESat data alone to predict elastic uplift rates biases the predicted rates by several millimeters per year at GPS locations along the north-western coast.
AB - 2003-2009 using Ice, Cloud and land Elevation Satellite (ICESat) laser altimeter data [Zwally et al., 2011]. Elevation changes are often reported to be largest near the frontal portion of outlet glaciers. To improve the volume change estimate, we supplement the ICESat data with altimeter surveys from NASA’s Airborne Topographic Mapper (ATM) from 2002-2010 [Krabill et al., 2011] and NASAs Land, Vegetation and Ice Sensor (LVIS) from 2010 [Blair and Hofton, 2010]. The airborne data are mainly concentrated along the ice margin and thus have a significant impact on the estimate of the volume change. Our results show that adding ATM and LVIS data to the ICESat data increases the catchment-wide estimate of ice volume loss by 11 percent, mainly due to an improved volume loss estimate along the ice sheet margin. Furthermore, our results show a significant acceleration in mass loss at elevations above 1200 m. Both the improved mass loss estimate along the ice sheet margin and the acceleration at higher elevations have implications for predictions of the elastic adjustment of the lithosphere caused by present-day ice mass changes. Our study shows that the use of ICESat data alone to predict elastic uplift rates biases the predicted rates by several millimeters per year at GPS locations along the north-western coast.
U2 - 10.1029/2012JB009684
DO - 10.1029/2012JB009684
M3 - Journal article
VL - 118
SP - 698
EP - 708
JO - Journal of Geophysical Research: Solid Earth
JF - Journal of Geophysical Research: Solid Earth
SN - 0148-0227
IS - 2
ER -
ID: 42036827