Vital role of daily temperature variability in surface mass balance parameterizations of the Greenland Ice Sheet
This study aims to demonstrate that the spatial and seasonal effects of daily temperature variability in positive degree-day (PDD) models play a decisive role in shaping the modeled surface mass balance (SMB) of continental-scale ice masses. Here we derive monthly fields of daily temperature standar...
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ftdoajarticles:oai:doaj.org/article:fb2370de451b4f538a29581100b8a8fa 2023-05-15T16:26:38+02:00 Vital role of daily temperature variability in surface mass balance parameterizations of the Greenland Ice Sheet I. Rogozhina D. Rau 2014-04-01T00:00:00Z https://doi.org/10.5194/tc-8-575-2014 https://doaj.org/article/fb2370de451b4f538a29581100b8a8fa EN eng Copernicus Publications http://www.the-cryosphere.net/8/575/2014/tc-8-575-2014.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-8-575-2014 https://doaj.org/article/fb2370de451b4f538a29581100b8a8fa The Cryosphere, Vol 8, Iss 2, Pp 575-585 (2014) Environmental sciences GE1-350 Geology QE1-996.5 article 2014 ftdoajarticles https://doi.org/10.5194/tc-8-575-2014 2022-12-31T13:29:45Z This study aims to demonstrate that the spatial and seasonal effects of daily temperature variability in positive degree-day (PDD) models play a decisive role in shaping the modeled surface mass balance (SMB) of continental-scale ice masses. Here we derive monthly fields of daily temperature standard deviation (SD) across Greenland from the ERA-40 (European Centre for Medium-Range Weather Forecasts 40 yr Reanalysis) reanalysis spanning from 1958 to 2001 and apply these fields to model recent surface responses of the Greenland Ice Sheet (GIS). Neither the climate data set analyzed nor in situ measurements taken in Greenland support the range of commonly used spatially and temporally uniform SD values (~ 5 °C). In this region, the SD distribution is highly inhomogeneous and characterized by low values during summer months (~ 1 to 2.5 °C) in areas where most surface melting occurs. As a result, existing SMB parameterizations using uniform, high SD values fail to capture both the spatial pattern and amplitude of the observed surface responses of the GIS. Using realistic SD values enables significant improvements in the modeled regional and total SMB with respect to existing estimates from recent satellite observations and the results of a high-resolution regional model. In addition, this resolves large uncertainties associated with other major parameters of a PDD model, namely degree-day factors. The model appears to be nearly insensitive to the choice of degree-day factors after adopting the realistic SD distribution. Article in Journal/Newspaper Greenland Ice Sheet The Cryosphere Directory of Open Access Journals: DOAJ Articles Greenland The Cryosphere 8 2 575 585 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 I. Rogozhina D. Rau Vital role of daily temperature variability in surface mass balance parameterizations of the Greenland Ice Sheet |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
This study aims to demonstrate that the spatial and seasonal effects of daily temperature variability in positive degree-day (PDD) models play a decisive role in shaping the modeled surface mass balance (SMB) of continental-scale ice masses. Here we derive monthly fields of daily temperature standard deviation (SD) across Greenland from the ERA-40 (European Centre for Medium-Range Weather Forecasts 40 yr Reanalysis) reanalysis spanning from 1958 to 2001 and apply these fields to model recent surface responses of the Greenland Ice Sheet (GIS). Neither the climate data set analyzed nor in situ measurements taken in Greenland support the range of commonly used spatially and temporally uniform SD values (~ 5 °C). In this region, the SD distribution is highly inhomogeneous and characterized by low values during summer months (~ 1 to 2.5 °C) in areas where most surface melting occurs. As a result, existing SMB parameterizations using uniform, high SD values fail to capture both the spatial pattern and amplitude of the observed surface responses of the GIS. Using realistic SD values enables significant improvements in the modeled regional and total SMB with respect to existing estimates from recent satellite observations and the results of a high-resolution regional model. In addition, this resolves large uncertainties associated with other major parameters of a PDD model, namely degree-day factors. The model appears to be nearly insensitive to the choice of degree-day factors after adopting the realistic SD distribution. |
format |
Article in Journal/Newspaper |
author |
I. Rogozhina D. Rau |
author_facet |
I. Rogozhina D. Rau |
author_sort |
I. Rogozhina |
title |
Vital role of daily temperature variability in surface mass balance parameterizations of the Greenland Ice Sheet |
title_short |
Vital role of daily temperature variability in surface mass balance parameterizations of the Greenland Ice Sheet |
title_full |
Vital role of daily temperature variability in surface mass balance parameterizations of the Greenland Ice Sheet |
title_fullStr |
Vital role of daily temperature variability in surface mass balance parameterizations of the Greenland Ice Sheet |
title_full_unstemmed |
Vital role of daily temperature variability in surface mass balance parameterizations of the Greenland Ice Sheet |
title_sort |
vital role of daily temperature variability in surface mass balance parameterizations of the greenland ice sheet |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/tc-8-575-2014 https://doaj.org/article/fb2370de451b4f538a29581100b8a8fa |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet The Cryosphere |
genre_facet |
Greenland Ice Sheet The Cryosphere |
op_source |
The Cryosphere, Vol 8, Iss 2, Pp 575-585 (2014) |
op_relation |
http://www.the-cryosphere.net/8/575/2014/tc-8-575-2014.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-8-575-2014 https://doaj.org/article/fb2370de451b4f538a29581100b8a8fa |
op_doi |
https://doi.org/10.5194/tc-8-575-2014 |
container_title |
The Cryosphere |
container_volume |
8 |
container_issue |
2 |
container_start_page |
575 |
op_container_end_page |
585 |
_version_ |
1766015576051810304 |