Remotely sensed debris thickness mapping of Bara Shigri Glacier, Indian Himalaya

Schauwecker, Simone, Rohrer, Mario, Huggel, Christian, Kulkarni, Anil, Ramanathan, Al, Salzmann, Nadine, Stoffel, Markus and Brock, Benjamin (2015) Remotely sensed debris thickness mapping of Bara Shigri Glacier, Indian Himalaya. Journal of Glaciology, 61 (228). pp. 675-688. ISSN 0022-1430

[img]
Preview
Text
s6.pdf - Published Version

Download (5MB) | Preview
Official URL: http://dx.doi.org/10.3189/2015JoG14J102

Abstract

Despite the important role of supraglacial debris in ablation, knowledge of debris thickness on Himalayan glaciers is sparse. A recently developed method based on reanalysis data and thermal band satellite imagery has proved to be potentially suitable for debris thickness estimation without the need for detailed field data. In this study, we further develop the method and discuss possibilities and limitations arising from its application to a glacier in the Himalaya with scarce in situ data. Surface temperature patterns are consistent for 13 scenes of Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and Landsat 7 imagery and correlate well with incoming shortwave radiation and air temperature. We use an energy-balance approach to subtract these radiation or air temperature effects, in order to estimate debris thickness patterns as a function of surface temperature. Both incoming shortwave and longwave radiation are estimated with reasonable accuracy when applying parameterizations and reanalysis data. However, the model likely underestimates debris thickness, probably due to incorrect representation of vertical debris temperature profiles, the rate of heat storage and turbulent sensible heat flux. Moreover, the uncertainty of the result was found to increase significantly with thicker debris, a promising result since ablation is enhanced by thin debris of 1–2 cm.

Item Type: Article
Additional Information: Published online first 23rd July 2015.
Uncontrolled Keywords: debris-covered glaciers, energy balance, glacier mapping, remote sensing
Subjects: F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography
Depositing User: Ay Okpokam
Date Deposited: 10 Sep 2015 12:27
Last Modified: 08 May 2017 18:11
URI: http://nrl.northumbria.ac.uk/id/eprint/23728

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics


Policies: NRL Policies | NRL University Deposit Policy | NRL Deposit Licence