Terminus position time series: Helheim and Kangerdlugssuaq glaciers, Greenland
We constructed high-temporal resolution time series of terminus position for Helheim and Kangerdlugssuaq glaciers, two major outlet glaciers of the Greenland Ice Sheet. Both glaciers terminate at tidewater in deep fjords. Calving front positions for each glacier are derived from ~daily resolution sa...
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Arctic Data Center
2013
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dataone:urn:uuid:d904d4d2-9b72-4924-9453-c2916617120d 2024-06-03T18:46:51+00:00 Terminus position time series: Helheim and Kangerdlugssuaq glaciers, Greenland K.M. Schild Gordon S. Hamilton ENVELOPE(-38.5,-32.5,68.7,66.1) BEGINDATE: 2001-04-24T00:00:00Z ENDDATE: 2010-10-26T00:00:00Z 2013-03-13T06:21:01Z https://search.dataone.org/view/urn:uuid:d904d4d2-9b72-4924-9453-c2916617120d unknown Arctic Data Center EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIERS EARTH REMOTE SENSING INSTRUMENTS > PASSIVE REMOTE SENSING > SPECTROMETERS/RADIOMETERS > IMAGING SPECTROMETERS/RADIOMETERS > MODIS > MODERATE-RESOLUTION IMAGING SPECTRORADIOMETER SATELLITE POINT 100 METERS TO 250 METERS DAILY TO WEEKLY Dataset 2013 dataone:urn:node:ARCTIC 2024-06-03T18:05:59Z We constructed high-temporal resolution time series of terminus position for Helheim and Kangerdlugssuaq glaciers, two major outlet glaciers of the Greenland Ice Sheet. Both glaciers terminate at tidewater in deep fjords. Calving front positions for each glacier are derived from ~daily resolution satellite images collected by the MODIS (MODerate resolution Imaging Spectroradiometer) sensors onboard the Terra and Aqua satellites. We use the MOD02QKM product which has a 250 m spatial resolution and is constructed from MODIS bands 12 in the visible part of the spectrum. Usable images are available for cloud-free days during periods of solar illumination, corresponding to near-daily coverage between 1 May and 31 October each year, and ~weekly coverage for the remainder of the year. Each terminus position was manually digitized according to the procedure described by Moon and Joughin (2008; Journal of Geophysical Research-Earth Surface) in which the calving terminus closes a polygon bounded on the sides by parallel lines approximating the lateral margins, and at the upglacier end by an arbitrary line well inland of the minimum observed terminus position. Repeating this procedure for each image yields the change in terminus area with time. We divide the area change by polygon width at each terminus position to obtain a width-averaged linear distance of advance/retreat. Uncertainty is ~250 m. For more details, see Schild and Hamilton (2013, Journal of Glaciology). Dataset glacier Greenland Ice Sheet Tidewater Arctic Data Center (via DataONE) Greenland ENVELOPE(-38.5,-32.5,68.7,66.1) |
institution |
Open Polar |
collection |
Arctic Data Center (via DataONE) |
op_collection_id |
dataone:urn:node:ARCTIC |
language |
unknown |
topic |
EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIERS EARTH REMOTE SENSING INSTRUMENTS > PASSIVE REMOTE SENSING > SPECTROMETERS/RADIOMETERS > IMAGING SPECTROMETERS/RADIOMETERS > MODIS > MODERATE-RESOLUTION IMAGING SPECTRORADIOMETER SATELLITE POINT 100 METERS TO 250 METERS DAILY TO WEEKLY |
spellingShingle |
EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIERS EARTH REMOTE SENSING INSTRUMENTS > PASSIVE REMOTE SENSING > SPECTROMETERS/RADIOMETERS > IMAGING SPECTROMETERS/RADIOMETERS > MODIS > MODERATE-RESOLUTION IMAGING SPECTRORADIOMETER SATELLITE POINT 100 METERS TO 250 METERS DAILY TO WEEKLY K.M. Schild Gordon S. Hamilton Terminus position time series: Helheim and Kangerdlugssuaq glaciers, Greenland |
topic_facet |
EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIERS EARTH REMOTE SENSING INSTRUMENTS > PASSIVE REMOTE SENSING > SPECTROMETERS/RADIOMETERS > IMAGING SPECTROMETERS/RADIOMETERS > MODIS > MODERATE-RESOLUTION IMAGING SPECTRORADIOMETER SATELLITE POINT 100 METERS TO 250 METERS DAILY TO WEEKLY |
description |
We constructed high-temporal resolution time series of terminus position for Helheim and Kangerdlugssuaq glaciers, two major outlet glaciers of the Greenland Ice Sheet. Both glaciers terminate at tidewater in deep fjords. Calving front positions for each glacier are derived from ~daily resolution satellite images collected by the MODIS (MODerate resolution Imaging Spectroradiometer) sensors onboard the Terra and Aqua satellites. We use the MOD02QKM product which has a 250 m spatial resolution and is constructed from MODIS bands 12 in the visible part of the spectrum. Usable images are available for cloud-free days during periods of solar illumination, corresponding to near-daily coverage between 1 May and 31 October each year, and ~weekly coverage for the remainder of the year. Each terminus position was manually digitized according to the procedure described by Moon and Joughin (2008; Journal of Geophysical Research-Earth Surface) in which the calving terminus closes a polygon bounded on the sides by parallel lines approximating the lateral margins, and at the upglacier end by an arbitrary line well inland of the minimum observed terminus position. Repeating this procedure for each image yields the change in terminus area with time. We divide the area change by polygon width at each terminus position to obtain a width-averaged linear distance of advance/retreat. Uncertainty is ~250 m. For more details, see Schild and Hamilton (2013, Journal of Glaciology). |
format |
Dataset |
author |
K.M. Schild Gordon S. Hamilton |
author_facet |
K.M. Schild Gordon S. Hamilton |
author_sort |
K.M. Schild |
title |
Terminus position time series: Helheim and Kangerdlugssuaq glaciers, Greenland |
title_short |
Terminus position time series: Helheim and Kangerdlugssuaq glaciers, Greenland |
title_full |
Terminus position time series: Helheim and Kangerdlugssuaq glaciers, Greenland |
title_fullStr |
Terminus position time series: Helheim and Kangerdlugssuaq glaciers, Greenland |
title_full_unstemmed |
Terminus position time series: Helheim and Kangerdlugssuaq glaciers, Greenland |
title_sort |
terminus position time series: helheim and kangerdlugssuaq glaciers, greenland |
publisher |
Arctic Data Center |
publishDate |
2013 |
url |
https://search.dataone.org/view/urn:uuid:d904d4d2-9b72-4924-9453-c2916617120d |
op_coverage |
ENVELOPE(-38.5,-32.5,68.7,66.1) BEGINDATE: 2001-04-24T00:00:00Z ENDDATE: 2010-10-26T00:00:00Z |
long_lat |
ENVELOPE(-38.5,-32.5,68.7,66.1) |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet Tidewater |
genre_facet |
glacier Greenland Ice Sheet Tidewater |
_version_ |
1800872008967258112 |