Modelling radiative transfer through ponded first-year Arctic sea ice with a plane-parallel model
Under-ice irradiance measurements were done on ponded first-year pack ice along three transects during the ICE12 expedition north of Svalbard. Bulk transmittances (400–900 nm) were found to be on average 0.15–0.20 under bare ice, and 0.39–0.46 under ponded ice. Radiative transfer modelling was done...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , |
Format: | Other/Unknown Material |
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-11-2137-2017 https://tc.copernicus.org/articles/11/2137/2017/ |
id |
ftcopernicus:oai:publications.copernicus.org:tc57836 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:tc57836 2023-05-15T13:11:39+02:00 Modelling radiative transfer through ponded first-year Arctic sea ice with a plane-parallel model Taskjelle, Torbjørn Hudson, Stephen R. Granskog, Mats A. Hamre, Børge 2018-09-27 info:eu-repo/semantics/application/pdf https://doi.org/10.5194/tc-11-2137-2017 https://tc.copernicus.org/articles/11/2137/2017/ eng eng info:eu-repo/grantAgreement/EC/FP7/265863 doi:10.5194/tc-11-2137-2017 https://tc.copernicus.org/articles/11/2137/2017/ info:eu-repo/semantics/openAccess eISSN: 1994-0424 info:eu-repo/semantics/Text 2018 ftcopernicus https://doi.org/10.5194/tc-11-2137-2017 2020-07-20T16:23:37Z Under-ice irradiance measurements were done on ponded first-year pack ice along three transects during the ICE12 expedition north of Svalbard. Bulk transmittances (400–900 nm) were found to be on average 0.15–0.20 under bare ice, and 0.39–0.46 under ponded ice. Radiative transfer modelling was done with a plane-parallel model. While simulated transmittances deviate significantly from measured transmittances close to the edge of ponds, spatially averaged bulk transmittances agree well. That is, transect-average bulk transmittances, calculated using typical simulated transmittances for ponded and bare ice weighted by the fractional coverage of the two surface types, are in good agreement with the measured values. Radiative heating rates calculated from model output indicates that about 20 % of the incident solar energy is absorbed in bare ice, and 50 % in ponded ice (35 % in pond itself, 15 % in the underlying ice). This large difference is due to the highly scattering surface scattering layer (SSL) increasing the albedo of the bare ice. Other/Unknown Material albedo Arctic Sea ice Svalbard Copernicus Publications: E-Journals Arctic Svalbard The Cryosphere 11 5 2137 2148 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Under-ice irradiance measurements were done on ponded first-year pack ice along three transects during the ICE12 expedition north of Svalbard. Bulk transmittances (400–900 nm) were found to be on average 0.15–0.20 under bare ice, and 0.39–0.46 under ponded ice. Radiative transfer modelling was done with a plane-parallel model. While simulated transmittances deviate significantly from measured transmittances close to the edge of ponds, spatially averaged bulk transmittances agree well. That is, transect-average bulk transmittances, calculated using typical simulated transmittances for ponded and bare ice weighted by the fractional coverage of the two surface types, are in good agreement with the measured values. Radiative heating rates calculated from model output indicates that about 20 % of the incident solar energy is absorbed in bare ice, and 50 % in ponded ice (35 % in pond itself, 15 % in the underlying ice). This large difference is due to the highly scattering surface scattering layer (SSL) increasing the albedo of the bare ice. |
format |
Other/Unknown Material |
author |
Taskjelle, Torbjørn Hudson, Stephen R. Granskog, Mats A. Hamre, Børge |
spellingShingle |
Taskjelle, Torbjørn Hudson, Stephen R. Granskog, Mats A. Hamre, Børge Modelling radiative transfer through ponded first-year Arctic sea ice with a plane-parallel model |
author_facet |
Taskjelle, Torbjørn Hudson, Stephen R. Granskog, Mats A. Hamre, Børge |
author_sort |
Taskjelle, Torbjørn |
title |
Modelling radiative transfer through ponded first-year Arctic sea ice with a plane-parallel model |
title_short |
Modelling radiative transfer through ponded first-year Arctic sea ice with a plane-parallel model |
title_full |
Modelling radiative transfer through ponded first-year Arctic sea ice with a plane-parallel model |
title_fullStr |
Modelling radiative transfer through ponded first-year Arctic sea ice with a plane-parallel model |
title_full_unstemmed |
Modelling radiative transfer through ponded first-year Arctic sea ice with a plane-parallel model |
title_sort |
modelling radiative transfer through ponded first-year arctic sea ice with a plane-parallel model |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-11-2137-2017 https://tc.copernicus.org/articles/11/2137/2017/ |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
albedo Arctic Sea ice Svalbard |
genre_facet |
albedo Arctic Sea ice Svalbard |
op_source |
eISSN: 1994-0424 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/265863 doi:10.5194/tc-11-2137-2017 https://tc.copernicus.org/articles/11/2137/2017/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-11-2137-2017 |
container_title |
The Cryosphere |
container_volume |
11 |
container_issue |
5 |
container_start_page |
2137 |
op_container_end_page |
2148 |
_version_ |
1766248329714335744 |