The role of radiation penetration in the energy budget of the snowpack at Summit, Greenland
Measurements of the summer surface energy balance at Summit, Greenland, are presented (8 June–20 July 2007). These measurements serve as input to an energy balance model that searches for a surface temperature for which closure of all energy terms is achieved. A good agreement between observed and m...
Main Authors: | , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2009
|
Subjects: | |
Online Access: | http://www.the-cryosphere.net/3/155/2009/tc-3-155-2009.pdf https://doaj.org/article/e3d6bcb6ff684b32bbb621efa1bf96e5 |
id |
fttriple:oai:gotriple.eu:oai:doaj.org/article:e3d6bcb6ff684b32bbb621efa1bf96e5 |
---|---|
record_format |
openpolar |
spelling |
fttriple:oai:gotriple.eu:oai:doaj.org/article:e3d6bcb6ff684b32bbb621efa1bf96e5 2023-05-15T16:28:06+02:00 The role of radiation penetration in the energy budget of the snowpack at Summit, Greenland P. Kuipers Munneke M. R. van den Broeke C. H. Reijmer M. M. Helsen W. Boot M. Schneebeli K. Steffen 2009-07-01 http://www.the-cryosphere.net/3/155/2009/tc-3-155-2009.pdf https://doaj.org/article/e3d6bcb6ff684b32bbb621efa1bf96e5 en eng Copernicus Publications 1994-0416 1994-0424 http://www.the-cryosphere.net/3/155/2009/tc-3-155-2009.pdf https://doaj.org/article/e3d6bcb6ff684b32bbb621efa1bf96e5 undefined The Cryosphere, Vol 3, Iss 2, Pp 155-165 (2009) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2009 fttriple 2023-01-22T18:10:49Z Measurements of the summer surface energy balance at Summit, Greenland, are presented (8 June–20 July 2007). These measurements serve as input to an energy balance model that searches for a surface temperature for which closure of all energy terms is achieved. A good agreement between observed and modelled surface temperatures was found, with an average difference of 0.45°C and an RMSE of 0.85°C. It turns out that penetration of shortwave radiation into the snowpack plays a small but important role in correctly simulating snow temperatures. After 42 days, snow temperatures in the first meter are 3.6–4.0°C higher compared to a model simulation without radiation penetration. Sensitivity experiments show that these results cannot be reproduced by tuning the heat conduction process alone, by varying snow density or snow diffusivity. We compared the two-stream radiation penetration calculations with a sophisticated radiative transfer model and discuss the differences. The average diurnal cycle shows that net shortwave radiation is the largest energy source (diurnal average of +61 W m−2), net longwave radiation the largest energy sink (−42 W m−2). On average, subsurface heat flux, sensible and latent heat fluxes are the remaining, small heat sinks (−5, −5 and −7 W m−2, respectively), although these are more important on a subdaily timescale. Article in Journal/Newspaper Greenland The Cryosphere Unknown Greenland |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir P. Kuipers Munneke M. R. van den Broeke C. H. Reijmer M. M. Helsen W. Boot M. Schneebeli K. Steffen The role of radiation penetration in the energy budget of the snowpack at Summit, Greenland |
topic_facet |
geo envir |
description |
Measurements of the summer surface energy balance at Summit, Greenland, are presented (8 June–20 July 2007). These measurements serve as input to an energy balance model that searches for a surface temperature for which closure of all energy terms is achieved. A good agreement between observed and modelled surface temperatures was found, with an average difference of 0.45°C and an RMSE of 0.85°C. It turns out that penetration of shortwave radiation into the snowpack plays a small but important role in correctly simulating snow temperatures. After 42 days, snow temperatures in the first meter are 3.6–4.0°C higher compared to a model simulation without radiation penetration. Sensitivity experiments show that these results cannot be reproduced by tuning the heat conduction process alone, by varying snow density or snow diffusivity. We compared the two-stream radiation penetration calculations with a sophisticated radiative transfer model and discuss the differences. The average diurnal cycle shows that net shortwave radiation is the largest energy source (diurnal average of +61 W m−2), net longwave radiation the largest energy sink (−42 W m−2). On average, subsurface heat flux, sensible and latent heat fluxes are the remaining, small heat sinks (−5, −5 and −7 W m−2, respectively), although these are more important on a subdaily timescale. |
format |
Article in Journal/Newspaper |
author |
P. Kuipers Munneke M. R. van den Broeke C. H. Reijmer M. M. Helsen W. Boot M. Schneebeli K. Steffen |
author_facet |
P. Kuipers Munneke M. R. van den Broeke C. H. Reijmer M. M. Helsen W. Boot M. Schneebeli K. Steffen |
author_sort |
P. Kuipers Munneke |
title |
The role of radiation penetration in the energy budget of the snowpack at Summit, Greenland |
title_short |
The role of radiation penetration in the energy budget of the snowpack at Summit, Greenland |
title_full |
The role of radiation penetration in the energy budget of the snowpack at Summit, Greenland |
title_fullStr |
The role of radiation penetration in the energy budget of the snowpack at Summit, Greenland |
title_full_unstemmed |
The role of radiation penetration in the energy budget of the snowpack at Summit, Greenland |
title_sort |
role of radiation penetration in the energy budget of the snowpack at summit, greenland |
publisher |
Copernicus Publications |
publishDate |
2009 |
url |
http://www.the-cryosphere.net/3/155/2009/tc-3-155-2009.pdf https://doaj.org/article/e3d6bcb6ff684b32bbb621efa1bf96e5 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland The Cryosphere |
genre_facet |
Greenland The Cryosphere |
op_source |
The Cryosphere, Vol 3, Iss 2, Pp 155-165 (2009) |
op_relation |
1994-0416 1994-0424 http://www.the-cryosphere.net/3/155/2009/tc-3-155-2009.pdf https://doaj.org/article/e3d6bcb6ff684b32bbb621efa1bf96e5 |
op_rights |
undefined |
_version_ |
1766017734733201408 |