Calibration and evaluation of a high-resolution surface mass-balance model for Paakitsoq, West Greenland
Modelling the hydrology of the Greenland ice sheet, including the filling and drainage of supraglacial lakes, requires melt inputs generated at high spatial and temporal resolution. Here we apply a high spatial (100 m) and temporal (1 hour) mass-balance model to a 450 km2 subset of the Paakitsoq reg...
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/D8CF9Q01 2023-05-15T16:26:16+02:00 Calibration and evaluation of a high-resolution surface mass-balance model for Paakitsoq, West Greenland Banwell, Alison F. Willis, Ian C. Arnold, Neil S. Messerli, Alexandra Rye, Cameron J. Tedesco, Marco Ahlstrøm, Andreas P. 2012 https://doi.org/10.7916/D8CF9Q01 English eng International Glaciological Society https://doi.org/10.7916/D8CF9Q01 Glacial lakes Hydrology Meltwater Geomorphology Mineralogy Geology Articles 2012 ftcolumbiauniv https://doi.org/10.7916/D8CF9Q01 2019-04-04T08:14:19Z Modelling the hydrology of the Greenland ice sheet, including the filling and drainage of supraglacial lakes, requires melt inputs generated at high spatial and temporal resolution. Here we apply a high spatial (100 m) and temporal (1 hour) mass-balance model to a 450 km2 subset of the Paakitsoq region, West Greenland. The model is calibrated by adjusting the values for parameters of fresh snow density, threshold temperature for solid/liquid precipitation and elevation-dependent precipitation gradient to minimize the error between modelled output and surface height and albedo measurements from three Greenland Climate Network stations for the mass-balance years 2000/01 and 2004/05. Bestfit parameter values are consistent between the two years at 400 kg m–3, 2° C and +14% (100 m)–1, respectively. Model performance is evaluated, first, by comparing modelled snow and ice distribution with that derived from Landsat-7 ETM+ satellite imagery using normalized-difference snow index classification and supervised image thresholding; and second, by comparing modelled albedo with that retrieved from the MODIS sensor MOD10A1 product. Calculation of mass-balance components indicates that 6% of surface meltwater and rainwater refreezes in the snowpack and does not become runoff, such that refreezing accounts for 31% of the net accumulation. 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 |
Glacial lakes Hydrology Meltwater Geomorphology Mineralogy Geology |
spellingShingle |
Glacial lakes Hydrology Meltwater Geomorphology Mineralogy Geology Banwell, Alison F. Willis, Ian C. Arnold, Neil S. Messerli, Alexandra Rye, Cameron J. Tedesco, Marco Ahlstrøm, Andreas P. Calibration and evaluation of a high-resolution surface mass-balance model for Paakitsoq, West Greenland |
topic_facet |
Glacial lakes Hydrology Meltwater Geomorphology Mineralogy Geology |
description |
Modelling the hydrology of the Greenland ice sheet, including the filling and drainage of supraglacial lakes, requires melt inputs generated at high spatial and temporal resolution. Here we apply a high spatial (100 m) and temporal (1 hour) mass-balance model to a 450 km2 subset of the Paakitsoq region, West Greenland. The model is calibrated by adjusting the values for parameters of fresh snow density, threshold temperature for solid/liquid precipitation and elevation-dependent precipitation gradient to minimize the error between modelled output and surface height and albedo measurements from three Greenland Climate Network stations for the mass-balance years 2000/01 and 2004/05. Bestfit parameter values are consistent between the two years at 400 kg m–3, 2° C and +14% (100 m)–1, respectively. Model performance is evaluated, first, by comparing modelled snow and ice distribution with that derived from Landsat-7 ETM+ satellite imagery using normalized-difference snow index classification and supervised image thresholding; and second, by comparing modelled albedo with that retrieved from the MODIS sensor MOD10A1 product. Calculation of mass-balance components indicates that 6% of surface meltwater and rainwater refreezes in the snowpack and does not become runoff, such that refreezing accounts for 31% of the net accumulation. |
format |
Article in Journal/Newspaper |
author |
Banwell, Alison F. Willis, Ian C. Arnold, Neil S. Messerli, Alexandra Rye, Cameron J. Tedesco, Marco Ahlstrøm, Andreas P. |
author_facet |
Banwell, Alison F. Willis, Ian C. Arnold, Neil S. Messerli, Alexandra Rye, Cameron J. Tedesco, Marco Ahlstrøm, Andreas P. |
author_sort |
Banwell, Alison F. |
title |
Calibration and evaluation of a high-resolution surface mass-balance model for Paakitsoq, West Greenland |
title_short |
Calibration and evaluation of a high-resolution surface mass-balance model for Paakitsoq, West Greenland |
title_full |
Calibration and evaluation of a high-resolution surface mass-balance model for Paakitsoq, West Greenland |
title_fullStr |
Calibration and evaluation of a high-resolution surface mass-balance model for Paakitsoq, West Greenland |
title_full_unstemmed |
Calibration and evaluation of a high-resolution surface mass-balance model for Paakitsoq, West Greenland |
title_sort |
calibration and evaluation of a high-resolution surface mass-balance model for paakitsoq, west greenland |
publisher |
International Glaciological Society |
publishDate |
2012 |
url |
https://doi.org/10.7916/D8CF9Q01 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
https://doi.org/10.7916/D8CF9Q01 |
op_doi |
https://doi.org/10.7916/D8CF9Q01 |
_version_ |
1766015172285038592 |