Interannual modulation of seasonal glacial velocity variations in the Eastern Karakoram detected by ALOS-1/2 data
Unlike in most other regions, Karakoram glaciers are either stable or advancing, a phenomenon known as the Karakoram anomaly. Despite studies of glacier surges and the derivation of surface velocity maps, the spatiotemporal variability of glacier dynamics still remains poorly understood, particularl...
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ftdoajarticles:oai:doaj.org/article:dc6b9115830f440ebe2d19ea8327b0a4 2023-05-15T16:57:32+02:00 Interannual modulation of seasonal glacial velocity variations in the Eastern Karakoram detected by ALOS-1/2 data MUHAMMAD USMAN MASATO FURUYA 2018-06-01T00:00:00Z https://doi.org/10.1017/jog.2018.39 https://doaj.org/article/dc6b9115830f440ebe2d19ea8327b0a4 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143018000394/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2018.39 0022-1430 1727-5652 https://doaj.org/article/dc6b9115830f440ebe2d19ea8327b0a4 Journal of Glaciology, Vol 64, Pp 465-476 (2018) glacier velocity interannual modulation L-band SAR pixel offset summer speed-up Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2018 ftdoajarticles https://doi.org/10.1017/jog.2018.39 2023-03-12T01:30:59Z Unlike in most other regions, Karakoram glaciers are either stable or advancing, a phenomenon known as the Karakoram anomaly. Despite studies of glacier surges and the derivation of surface velocity maps, the spatiotemporal variability of glacier dynamics still remains poorly understood, particularly in the Eastern Karakoram Range. We use Advanced Land Observing Satellite/the Phased Array type L-band Synthetic Aperture Radar (ALOS/PALSAR)-1/2 data from 2007 to 2011 and 2014 to 2015 to examine detailed surface velocity patterns of the Siachen, Baltoro, Kundos, Singkhu and Gasherbrum Glaciers. The first three glaciers show considerable velocity variability (20–350 m a−1), with clear seasonal patterns. Although all glaciers, except for Baltoro, flow slowest in 2015, the velocity structures are individual and vary in space and time. In Gasherbrum Glacier, peak surge-phase velocities are seasonally modulated, with maxima in summers 2006 and 2007, suggesting surface melt plays an important role in maintaining the active phase. Given the relatively close proximity of these glaciers, we assume that surface melt timing and rates are comparable. We therefore argue that the observed spatiotemporal and interannual velocity patterns are determined by local and internal mechanisms, including englacial and subglacial hydrology, thermal processes and tributary configuration of each individual glacier. Article in Journal/Newspaper Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Glacier Peak ENVELOPE(-128.637,-128.637,54.700,54.700) Journal of Glaciology 64 245 465 476 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
glacier velocity interannual modulation L-band SAR pixel offset summer speed-up Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
glacier velocity interannual modulation L-band SAR pixel offset summer speed-up Environmental sciences GE1-350 Meteorology. Climatology QC851-999 MUHAMMAD USMAN MASATO FURUYA Interannual modulation of seasonal glacial velocity variations in the Eastern Karakoram detected by ALOS-1/2 data |
topic_facet |
glacier velocity interannual modulation L-band SAR pixel offset summer speed-up Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Unlike in most other regions, Karakoram glaciers are either stable or advancing, a phenomenon known as the Karakoram anomaly. Despite studies of glacier surges and the derivation of surface velocity maps, the spatiotemporal variability of glacier dynamics still remains poorly understood, particularly in the Eastern Karakoram Range. We use Advanced Land Observing Satellite/the Phased Array type L-band Synthetic Aperture Radar (ALOS/PALSAR)-1/2 data from 2007 to 2011 and 2014 to 2015 to examine detailed surface velocity patterns of the Siachen, Baltoro, Kundos, Singkhu and Gasherbrum Glaciers. The first three glaciers show considerable velocity variability (20–350 m a−1), with clear seasonal patterns. Although all glaciers, except for Baltoro, flow slowest in 2015, the velocity structures are individual and vary in space and time. In Gasherbrum Glacier, peak surge-phase velocities are seasonally modulated, with maxima in summers 2006 and 2007, suggesting surface melt plays an important role in maintaining the active phase. Given the relatively close proximity of these glaciers, we assume that surface melt timing and rates are comparable. We therefore argue that the observed spatiotemporal and interannual velocity patterns are determined by local and internal mechanisms, including englacial and subglacial hydrology, thermal processes and tributary configuration of each individual glacier. |
format |
Article in Journal/Newspaper |
author |
MUHAMMAD USMAN MASATO FURUYA |
author_facet |
MUHAMMAD USMAN MASATO FURUYA |
author_sort |
MUHAMMAD USMAN |
title |
Interannual modulation of seasonal glacial velocity variations in the Eastern Karakoram detected by ALOS-1/2 data |
title_short |
Interannual modulation of seasonal glacial velocity variations in the Eastern Karakoram detected by ALOS-1/2 data |
title_full |
Interannual modulation of seasonal glacial velocity variations in the Eastern Karakoram detected by ALOS-1/2 data |
title_fullStr |
Interannual modulation of seasonal glacial velocity variations in the Eastern Karakoram detected by ALOS-1/2 data |
title_full_unstemmed |
Interannual modulation of seasonal glacial velocity variations in the Eastern Karakoram detected by ALOS-1/2 data |
title_sort |
interannual modulation of seasonal glacial velocity variations in the eastern karakoram detected by alos-1/2 data |
publisher |
Cambridge University Press |
publishDate |
2018 |
url |
https://doi.org/10.1017/jog.2018.39 https://doaj.org/article/dc6b9115830f440ebe2d19ea8327b0a4 |
long_lat |
ENVELOPE(-128.637,-128.637,54.700,54.700) |
geographic |
Glacier Peak |
geographic_facet |
Glacier Peak |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 64, Pp 465-476 (2018) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143018000394/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2018.39 0022-1430 1727-5652 https://doaj.org/article/dc6b9115830f440ebe2d19ea8327b0a4 |
op_doi |
https://doi.org/10.1017/jog.2018.39 |
container_title |
Journal of Glaciology |
container_volume |
64 |
container_issue |
245 |
container_start_page |
465 |
op_container_end_page |
476 |
_version_ |
1766049101796868096 |