Assessing Orographic Variability in Glacial Thickness Changes at the Tibetan Plateau Using ICESat Laser Altimetry

Phan Hien, V.; Lindenbergh, R.C.; Menenti, M.

doi:10.3390/rs9020160

Assessing Orographic Variability in Glacial Thickness Changes at the Tibetan Plateau Using ICESat Laser Altimetry

Title

Assessing Orographic Variability in Glacial Thickness Changes at the Tibetan Plateau Using ICESat Laser Altimetry

Author

Phan Hien, V. (Vietnam National University)
Lindenbergh, R.C. (TU Delft Optical and Laser Remote Sensing)
Menenti, M. (TU Delft Optical and Laser Remote Sensing)

Date

2017

Abstract

Monitoring glacier changes is essential for estimating the water mass balance of the Tibetan Plateau. In this study, we exploit ICESat laser altimetry data in combination with the SRTM DEM and the GLIMS glacier mask to estimate trends in change in glacial thickness between 2003 and 2009 on the whole Tibetan Plateau. Considering acquisition conditions of ICESat measurements and terrain surface characteristics, annual glacier elevation trends were estimated for 15 different settings with respect to terrain slope and roughness. In the end, we only included ICESat elevations acquired over terrain with a slope below 20° and a roughness at the footprint scale below 15 m. With this setting, 90 glaciated areas could be distinguished. The results show that most of observed glaciated areas on the Tibetan Plateau are thinning, except for some glaciers in the northwest. In general, glacier elevations on the whole Tibetan Plateau decreased at an average rate of -0.17± 0.47 m per year (m a-1) between 2003 and 2009, taking together glaciers of any size, distribution, and location of the observed glaciated area. Both rate and rate error estimates are obtained by accumulating results from individual regions using least squares techniques. Our results notably show that trends in glacier thickness change indeed strongly depend on the relative position in a mountain range.

Subject

glacier change
Tibetan Plateau
ICESat
GLIMS
SRTM DEM

To reference this document use:

http://resolver.tudelft.nl/uuid:b17c04da-4299-42a3-af74-5e41d0ae0920

DOI

https://doi.org/10.3390/rs9020160

ISSN

2072-4292

Source

Remote Sensing, 9 (2)

Part of collection

Institutional Repository