In-situ multispectral and bathymetric measurements over a supraglacial lake in western Greenland using a remotely controlled watercraft
Supraglacial lakes form from meltwater on the Greenland ice sheet in topographic depressions on the surface, affecting both surface and sub-glacial processes. As the reflectance in the visible and near-infrared regions of a column of water is modulated by its height, retrieval techniques using space...
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/D86M36Q4 2023-05-15T16:27:34+02:00 In-situ multispectral and bathymetric measurements over a supraglacial lake in western Greenland using a remotely controlled watercraft Tedesco, Marco Steiner, N. 2011 https://doi.org/10.7916/D86M36Q4 English eng European Geosciences Union https://doi.org/10.7916/D86M36Q4 Albedo Meltwater Climatic geomorphology Runoff Glacial lakes Ice sheets Geology Geomorphology Hydrology Articles 2011 ftcolumbiauniv https://doi.org/10.7916/D86M36Q4 2019-04-04T08:14:19Z Supraglacial lakes form from meltwater on the Greenland ice sheet in topographic depressions on the surface, affecting both surface and sub-glacial processes. As the reflectance in the visible and near-infrared regions of a column of water is modulated by its height, retrieval techniques using spaceborne remote sensing data (e.g. Landsat, MODIS) have been proposed in the literature for the detection of lakes and estimation of their volume. These techniques require basic assumptions on the spectral properties of the water as well as the bottom of the lake, among other things. In this study, we report results obtained from the analysis of concurrent in-situ multi-spectral and depth measurements collected over a supraglacial lake during early July 2010 in West Greenland (Lake Olivia, 69°36'35" N, 49°29'40" W) and aim to assess some of the underlying hypotheses in remote sensing based bathymetric approaches. In particular, we focus our attention on the analysis of the lake bottom albedo and of the water attenuation coefficient. The analysis of in-situ data (collected by means of a remotely controlled boat equipped with a GPS, a sonar and a spectrometer) highlights the exponential trend of the water-leaving reflectance with lake depth. The values of the attenuation factor obtained from in-situ data are compared with those computed using approaches proposed in the literature. Also, the values of the lake bottom albedo from in-situ measurements are compared with those obtained from the analysis of reflectance of shallow waters. Finally, we quantify the error between in-situ measured and satellite-estimated lake depth values for the lake under study. Article in Journal/Newspaper Greenland Ice Sheet Columbia University: Academic Commons Greenland |
institution |
Open Polar |
collection |
Columbia University: Academic Commons |
op_collection_id |
ftcolumbiauniv |
language |
English |
topic |
Albedo Meltwater Climatic geomorphology Runoff Glacial lakes Ice sheets Geology Geomorphology Hydrology |
spellingShingle |
Albedo Meltwater Climatic geomorphology Runoff Glacial lakes Ice sheets Geology Geomorphology Hydrology Tedesco, Marco Steiner, N. In-situ multispectral and bathymetric measurements over a supraglacial lake in western Greenland using a remotely controlled watercraft |
topic_facet |
Albedo Meltwater Climatic geomorphology Runoff Glacial lakes Ice sheets Geology Geomorphology Hydrology |
description |
Supraglacial lakes form from meltwater on the Greenland ice sheet in topographic depressions on the surface, affecting both surface and sub-glacial processes. As the reflectance in the visible and near-infrared regions of a column of water is modulated by its height, retrieval techniques using spaceborne remote sensing data (e.g. Landsat, MODIS) have been proposed in the literature for the detection of lakes and estimation of their volume. These techniques require basic assumptions on the spectral properties of the water as well as the bottom of the lake, among other things. In this study, we report results obtained from the analysis of concurrent in-situ multi-spectral and depth measurements collected over a supraglacial lake during early July 2010 in West Greenland (Lake Olivia, 69°36'35" N, 49°29'40" W) and aim to assess some of the underlying hypotheses in remote sensing based bathymetric approaches. In particular, we focus our attention on the analysis of the lake bottom albedo and of the water attenuation coefficient. The analysis of in-situ data (collected by means of a remotely controlled boat equipped with a GPS, a sonar and a spectrometer) highlights the exponential trend of the water-leaving reflectance with lake depth. The values of the attenuation factor obtained from in-situ data are compared with those computed using approaches proposed in the literature. Also, the values of the lake bottom albedo from in-situ measurements are compared with those obtained from the analysis of reflectance of shallow waters. Finally, we quantify the error between in-situ measured and satellite-estimated lake depth values for the lake under study. |
format |
Article in Journal/Newspaper |
author |
Tedesco, Marco Steiner, N. |
author_facet |
Tedesco, Marco Steiner, N. |
author_sort |
Tedesco, Marco |
title |
In-situ multispectral and bathymetric measurements over a supraglacial lake in western Greenland using a remotely controlled watercraft |
title_short |
In-situ multispectral and bathymetric measurements over a supraglacial lake in western Greenland using a remotely controlled watercraft |
title_full |
In-situ multispectral and bathymetric measurements over a supraglacial lake in western Greenland using a remotely controlled watercraft |
title_fullStr |
In-situ multispectral and bathymetric measurements over a supraglacial lake in western Greenland using a remotely controlled watercraft |
title_full_unstemmed |
In-situ multispectral and bathymetric measurements over a supraglacial lake in western Greenland using a remotely controlled watercraft |
title_sort |
in-situ multispectral and bathymetric measurements over a supraglacial lake in western greenland using a remotely controlled watercraft |
publisher |
European Geosciences Union |
publishDate |
2011 |
url |
https://doi.org/10.7916/D86M36Q4 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
https://doi.org/10.7916/D86M36Q4 |
op_doi |
https://doi.org/10.7916/D86M36Q4 |
_version_ |
1766016964198662144 |