Estimating Greenland surface melt is hampered by melt induced dampening of temperature variability
The positive degree-day (PDD) model provides a particularly simple approach to estimate surface melt from land ice based solely on air temperature. Here, we use a climate and snow pack simulation of the Greenland ice sheet (Modèle Atmosphérique Régional, MAR) as a reference, to analyze this scheme i...
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Cambridge University Press
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ftdoajarticles:oai:doaj.org/article:32299c56ec6a481c827c0a3b4417cd58 2023-05-15T16:27:10+02:00 Estimating Greenland surface melt is hampered by melt induced dampening of temperature variability UTA KREBS-KANZOW PAUL GIERZ GERRIT LOHMANN 2018-04-01T00:00:00Z https://doi.org/10.1017/jog.2018.10 https://doaj.org/article/32299c56ec6a481c827c0a3b4417cd58 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143018000102/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2018.10 0022-1430 1727-5652 https://doaj.org/article/32299c56ec6a481c827c0a3b4417cd58 Journal of Glaciology, Vol 64, Pp 227-235 (2018) ice and climate mass-balance reconstruction melt – surface paleoclimate surface massbudget Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2018 ftdoajarticles https://doi.org/10.1017/jog.2018.10 2023-03-12T01:30:59Z The positive degree-day (PDD) model provides a particularly simple approach to estimate surface melt from land ice based solely on air temperature. Here, we use a climate and snow pack simulation of the Greenland ice sheet (Modèle Atmosphérique Régional, MAR) as a reference, to analyze this scheme in three realizations that incorporate the sub-monthly temperature variability differently: (i) by local values, (ii) by local values that systematically overestimate the dampened variability associated with intense melting or (iii) by one constant value. Local calibrations reveal that incorporating local temperature variability, particularly resolving the dampened variability of melt areas, renders model parameters more temperature-dependent. This indicates that the negative feedback between surface melt and temperature variability introduces a non-linearity into the temperature – melt relation. To assess the skill of the individual realizations, we hindcast melt rates from MAR temperatures for each realization. For this purpose, we globally calibrate Greenland-wide, constant parameters. Realization (i) exhibits shortcomings in the spatial representation of surface melt unless temperature-dependent instead of constant parameters are calibrated. The other realizations perform comparatively well with constant parametrizations. The skill of the PDD model primarily depends, however, on the consistent calibration rather than on the specific representation of variability. Article in Journal/Newspaper Greenland Ice Sheet Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Greenland Journal of Glaciology 64 244 227 235 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
ice and climate mass-balance reconstruction melt – surface paleoclimate surface massbudget Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
ice and climate mass-balance reconstruction melt – surface paleoclimate surface massbudget Environmental sciences GE1-350 Meteorology. Climatology QC851-999 UTA KREBS-KANZOW PAUL GIERZ GERRIT LOHMANN Estimating Greenland surface melt is hampered by melt induced dampening of temperature variability |
topic_facet |
ice and climate mass-balance reconstruction melt – surface paleoclimate surface massbudget Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
The positive degree-day (PDD) model provides a particularly simple approach to estimate surface melt from land ice based solely on air temperature. Here, we use a climate and snow pack simulation of the Greenland ice sheet (Modèle Atmosphérique Régional, MAR) as a reference, to analyze this scheme in three realizations that incorporate the sub-monthly temperature variability differently: (i) by local values, (ii) by local values that systematically overestimate the dampened variability associated with intense melting or (iii) by one constant value. Local calibrations reveal that incorporating local temperature variability, particularly resolving the dampened variability of melt areas, renders model parameters more temperature-dependent. This indicates that the negative feedback between surface melt and temperature variability introduces a non-linearity into the temperature – melt relation. To assess the skill of the individual realizations, we hindcast melt rates from MAR temperatures for each realization. For this purpose, we globally calibrate Greenland-wide, constant parameters. Realization (i) exhibits shortcomings in the spatial representation of surface melt unless temperature-dependent instead of constant parameters are calibrated. The other realizations perform comparatively well with constant parametrizations. The skill of the PDD model primarily depends, however, on the consistent calibration rather than on the specific representation of variability. |
format |
Article in Journal/Newspaper |
author |
UTA KREBS-KANZOW PAUL GIERZ GERRIT LOHMANN |
author_facet |
UTA KREBS-KANZOW PAUL GIERZ GERRIT LOHMANN |
author_sort |
UTA KREBS-KANZOW |
title |
Estimating Greenland surface melt is hampered by melt induced dampening of temperature variability |
title_short |
Estimating Greenland surface melt is hampered by melt induced dampening of temperature variability |
title_full |
Estimating Greenland surface melt is hampered by melt induced dampening of temperature variability |
title_fullStr |
Estimating Greenland surface melt is hampered by melt induced dampening of temperature variability |
title_full_unstemmed |
Estimating Greenland surface melt is hampered by melt induced dampening of temperature variability |
title_sort |
estimating greenland surface melt is hampered by melt induced dampening of temperature variability |
publisher |
Cambridge University Press |
publishDate |
2018 |
url |
https://doi.org/10.1017/jog.2018.10 https://doaj.org/article/32299c56ec6a481c827c0a3b4417cd58 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet Journal of Glaciology |
genre_facet |
Greenland Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 64, Pp 227-235 (2018) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143018000102/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2018.10 0022-1430 1727-5652 https://doaj.org/article/32299c56ec6a481c827c0a3b4417cd58 |
op_doi |
https://doi.org/10.1017/jog.2018.10 |
container_title |
Journal of Glaciology |
container_volume |
64 |
container_issue |
244 |
container_start_page |
227 |
op_container_end_page |
235 |
_version_ |
1766016257658716160 |