HR: 1340h
AN: C23A-0939    [Abstracts]
TI: Empirical Retrieval of Surface Melt Intensity using coupled MODIS Optical and Thermal Measurements over the Greenland Ice Sheet
AU: Peng, R
EM: rxp245@psu.edu
AF: Pennsylvania State University Department of Geography Department of Geoscience, RM 313 Walker Building, University Park, PA 16802, United States
AU: * Lampkin, D J
EM: djl22@psu.edu
AF: Pennsylvania State University Department of Geography Department of Geoscience, RM 313 Walker Building, University Park, PA 16802, United States
AU: Steffen, K
EM: Konrad.Steffen@colorado.edu
AF: Cooperative Institute for Research in environmental Sciences (CIRES), Director University of Colorado at Boulder, 216 UCB, Boulder, CO 80309-0216, United States
AB: An optical-thermal feature space partitioned as a function of melt intensity was derived using a one-dimensional thermal snowmelt model (SNTHERM). Cloud-free dates of June 10, July 5, 7, 9, and 11, 2001 MODIS daily reflectance Band 5 (1.230-1.250um) and surface temperature images rescaled to 1km over western Greenland were used in a retrieval algorithm. SNTHERM was forced by hourly meteorological data from the Greenland Climate Network (GC-Net) at reference sites spanning dry, percolation, and wet snow facies in the Jakobshavn drainage basin. Liquid water fractions (LWF) were derived for satellite composite periods covering May, June, and July displaying low fractions (0-1%) at elevations greater than 2500m and fractions at or greater than 15% at elevations lower than 1000m assessed for only the upper 5 cm of the snow surface. Comparison of LWF to mapped dry and wet zones determined from Quickscat backscatter indicated higher intensities distributed in wet snow zones, while lower intensities were grouped in dry zones.
DE: 0726 Ice sheets
DE: 0758 Remote sensing
DE: 1827 Glaciology (0736, 0776, 1863)
SC: Cryosphere [C]
MN: 2007 Fall Meeting