Validation of the sea ice surface albedo scheme of the regional climate model HIRHAM–NAOSIM using aircraft measurements during the ACLOUD/PASCAL campaigns
For large-scale and long-term Arctic climate simulations appropriate parameterization of the surface albedo is required. Therefore, the sea ice surface (SIS) albedo parameterization of the coupled regional climate model HIRHAM–NAOSIM was examined against broadband surface albedo measurements perform...
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2019
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Online Access: | https://doi.org/10.5194/tc-13-1695-2019 https://doaj.org/article/592669eec3fd4a52941a1e4d995026a1 |
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ftdoajarticles:oai:doaj.org/article:592669eec3fd4a52941a1e4d995026a1 2023-05-15T13:10:31+02:00 Validation of the sea ice surface albedo scheme of the regional climate model HIRHAM–NAOSIM using aircraft measurements during the ACLOUD/PASCAL campaigns E. Jäkel J. Stapf M. Wendisch M. Nicolaus W. Dorn A. Rinke 2019-06-01T00:00:00Z https://doi.org/10.5194/tc-13-1695-2019 https://doaj.org/article/592669eec3fd4a52941a1e4d995026a1 EN eng Copernicus Publications https://www.the-cryosphere.net/13/1695/2019/tc-13-1695-2019.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-13-1695-2019 1994-0416 1994-0424 https://doaj.org/article/592669eec3fd4a52941a1e4d995026a1 The Cryosphere, Vol 13, Pp 1695-1708 (2019) Environmental sciences GE1-350 Geology QE1-996.5 article 2019 ftdoajarticles https://doi.org/10.5194/tc-13-1695-2019 2022-12-31T09:20:14Z For large-scale and long-term Arctic climate simulations appropriate parameterization of the surface albedo is required. Therefore, the sea ice surface (SIS) albedo parameterization of the coupled regional climate model HIRHAM–NAOSIM was examined against broadband surface albedo measurements performed during the joint ACLOUD (Arctic CLoud Observations Using airborne measurements during polar Day) and PASCAL (Physical feedbacks of Arctic boundary layer, Sea ice, Cloud and AerosoL) campaigns, which were performed in May–June 2017 north of Svalbard. The SIS albedo parameterization was tested using measured quantities of the prognostic variables surface temperature and snow depth to calculate the surface albedo and the individual fractions of the ice surface subtypes (snow-covered ice, bare ice, and melt ponds) derived from digital camera images taken on board the Polar 5 and 6 aircraft. The selected low-altitude (less than 100 m) flight sections of overall 12 flights were performed over surfaces dominated by snow-covered ice. It was found that the range of parameterized SIS albedo for individual days is smaller than that of the measurements. This was attributed to the biased functional dependence of the SIS albedo parameterization on temperature. Furthermore, a time-variable bias was observed with higher values compared to the modeled SIS albedo (0.88 compared to 0.84 for 29 May 2017) in the beginning of the campaign, and an opposite trend towards the end of the campaign (0.67 versus 0.83 for 25 June 2017). Furthermore, the surface type fraction parameterization was tested against the camera image product, which revealed an agreement within 1 %. An adjustment of the variables, defining the parameterized SIS albedo, and additionally accounting for the cloud cover could reduce the root-mean-squared error from 0.14 to 0.04 for cloud free/broken cloud situations and from 0.06 to 0.05 for overcast conditions. Article in Journal/Newspaper albedo Arctic Sea ice Svalbard The Cryosphere Directory of Open Access Journals: DOAJ Articles Arctic Svalbard The Cryosphere 13 6 1695 1708 |
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 E. Jäkel J. Stapf M. Wendisch M. Nicolaus W. Dorn A. Rinke Validation of the sea ice surface albedo scheme of the regional climate model HIRHAM–NAOSIM using aircraft measurements during the ACLOUD/PASCAL campaigns |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
For large-scale and long-term Arctic climate simulations appropriate parameterization of the surface albedo is required. Therefore, the sea ice surface (SIS) albedo parameterization of the coupled regional climate model HIRHAM–NAOSIM was examined against broadband surface albedo measurements performed during the joint ACLOUD (Arctic CLoud Observations Using airborne measurements during polar Day) and PASCAL (Physical feedbacks of Arctic boundary layer, Sea ice, Cloud and AerosoL) campaigns, which were performed in May–June 2017 north of Svalbard. The SIS albedo parameterization was tested using measured quantities of the prognostic variables surface temperature and snow depth to calculate the surface albedo and the individual fractions of the ice surface subtypes (snow-covered ice, bare ice, and melt ponds) derived from digital camera images taken on board the Polar 5 and 6 aircraft. The selected low-altitude (less than 100 m) flight sections of overall 12 flights were performed over surfaces dominated by snow-covered ice. It was found that the range of parameterized SIS albedo for individual days is smaller than that of the measurements. This was attributed to the biased functional dependence of the SIS albedo parameterization on temperature. Furthermore, a time-variable bias was observed with higher values compared to the modeled SIS albedo (0.88 compared to 0.84 for 29 May 2017) in the beginning of the campaign, and an opposite trend towards the end of the campaign (0.67 versus 0.83 for 25 June 2017). Furthermore, the surface type fraction parameterization was tested against the camera image product, which revealed an agreement within 1 %. An adjustment of the variables, defining the parameterized SIS albedo, and additionally accounting for the cloud cover could reduce the root-mean-squared error from 0.14 to 0.04 for cloud free/broken cloud situations and from 0.06 to 0.05 for overcast conditions. |
format |
Article in Journal/Newspaper |
author |
E. Jäkel J. Stapf M. Wendisch M. Nicolaus W. Dorn A. Rinke |
author_facet |
E. Jäkel J. Stapf M. Wendisch M. Nicolaus W. Dorn A. Rinke |
author_sort |
E. Jäkel |
title |
Validation of the sea ice surface albedo scheme of the regional climate model HIRHAM–NAOSIM using aircraft measurements during the ACLOUD/PASCAL campaigns |
title_short |
Validation of the sea ice surface albedo scheme of the regional climate model HIRHAM–NAOSIM using aircraft measurements during the ACLOUD/PASCAL campaigns |
title_full |
Validation of the sea ice surface albedo scheme of the regional climate model HIRHAM–NAOSIM using aircraft measurements during the ACLOUD/PASCAL campaigns |
title_fullStr |
Validation of the sea ice surface albedo scheme of the regional climate model HIRHAM–NAOSIM using aircraft measurements during the ACLOUD/PASCAL campaigns |
title_full_unstemmed |
Validation of the sea ice surface albedo scheme of the regional climate model HIRHAM–NAOSIM using aircraft measurements during the ACLOUD/PASCAL campaigns |
title_sort |
validation of the sea ice surface albedo scheme of the regional climate model hirham–naosim using aircraft measurements during the acloud/pascal campaigns |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-13-1695-2019 https://doaj.org/article/592669eec3fd4a52941a1e4d995026a1 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
albedo Arctic Sea ice Svalbard The Cryosphere |
genre_facet |
albedo Arctic Sea ice Svalbard The Cryosphere |
op_source |
The Cryosphere, Vol 13, Pp 1695-1708 (2019) |
op_relation |
https://www.the-cryosphere.net/13/1695/2019/tc-13-1695-2019.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-13-1695-2019 1994-0416 1994-0424 https://doaj.org/article/592669eec3fd4a52941a1e4d995026a1 |
op_doi |
https://doi.org/10.5194/tc-13-1695-2019 |
container_title |
The Cryosphere |
container_volume |
13 |
container_issue |
6 |
container_start_page |
1695 |
op_container_end_page |
1708 |
_version_ |
1766232218967998464 |