A transitioning Arctic surface energy budget: the impacts of solar zenith angle, surface albedo and cloud radiative forcing
Snow surface and sea-ice energy budgets were measured near 87. 5°N during the Arctic Summer Cloud Ocean Study (ASCOS), from August to early September 2008. Surface temperature indicated four distinct temperature regimes, characterized by varying cloud, thermodynamic and solar properties. An initial...
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ftleedsuniv:oai:eprints.whiterose.ac.uk:77217 2024-06-02T07:54:31+00:00 A transitioning Arctic surface energy budget: the impacts of solar zenith angle, surface albedo and cloud radiative forcing Sedlar, J Tjernstrom, M Mauritsen, T Shupe, MD Brooks, IM Persson, POG Birch, CE Leck, C Sirevaag, A Nicolaus, M 2011-10 text https://eprints.whiterose.ac.uk/77217/ https://eprints.whiterose.ac.uk/77217/7/sedlar_etal_v2.1_with_coversheet.pdf https://doi.org/10.1007/s00382-010-0937-5 en eng Springer Verlag https://eprints.whiterose.ac.uk/77217/7/sedlar_etal_v2.1_with_coversheet.pdf Sedlar, J, Tjernstrom, M, Mauritsen, T et al. (7 more authors) (2011) A transitioning Arctic surface energy budget: the impacts of solar zenith angle, surface albedo and cloud radiative forcing. Climate Dynamics, 37 (7-8). 1643 - 1660. ISSN 0930-7575 Article NonPeerReviewed 2011 ftleedsuniv https://doi.org/10.1007/s00382-010-0937-5 2024-05-06T12:40:54Z Snow surface and sea-ice energy budgets were measured near 87. 5°N during the Arctic Summer Cloud Ocean Study (ASCOS), from August to early September 2008. Surface temperature indicated four distinct temperature regimes, characterized by varying cloud, thermodynamic and solar properties. An initial warm, melt-season regime was interrupted by a 3-day cold regime where temperatures dropped from near zero to -7°C. Subsequently mean energy budget residuals remained small and near zero for 1 week until once again temperatures dropped rapidly and the energy budget residuals became negative. Energy budget transitions were dominated by the net radiative fluxes, largely controlled by the cloudiness. Variable heat, moisture and cloud distributions were associated with changing air-masses. Surface cloud radiative forcing, the net radiative effect of clouds on the surface relative to clear skies, is estimated. Shortwave cloud forcing ranged between -50 W m-2 and zero and varied significantly with surface albedo, solar zenith angle and cloud liquid water. Longwave cloud forcing was larger and generally ranged between 65 and 85 W m-2, except when the cloud fraction was tenuous or contained little liquid water; thus the net effect of the clouds was to warm the surface. Both cold periods occurred under tenuous, or altogether absent, low-level clouds containing little liquid water, effectively reducing the cloud greenhouse effect. Freeze-up progression was enhanced by a combination of increasing solar zenith angles and surface albedo, while inhibited by a large, positive surface cloud forcing until a new air-mass with considerably less cloudiness advected over the experiment area. Article in Journal/Newspaper albedo Arctic Arctic Sea ice White Rose Research Online (Universities of Leeds, Sheffield & York) Arctic Climate Dynamics 37 7-8 1643 1660 |
institution |
Open Polar |
collection |
White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
description |
Snow surface and sea-ice energy budgets were measured near 87. 5°N during the Arctic Summer Cloud Ocean Study (ASCOS), from August to early September 2008. Surface temperature indicated four distinct temperature regimes, characterized by varying cloud, thermodynamic and solar properties. An initial warm, melt-season regime was interrupted by a 3-day cold regime where temperatures dropped from near zero to -7°C. Subsequently mean energy budget residuals remained small and near zero for 1 week until once again temperatures dropped rapidly and the energy budget residuals became negative. Energy budget transitions were dominated by the net radiative fluxes, largely controlled by the cloudiness. Variable heat, moisture and cloud distributions were associated with changing air-masses. Surface cloud radiative forcing, the net radiative effect of clouds on the surface relative to clear skies, is estimated. Shortwave cloud forcing ranged between -50 W m-2 and zero and varied significantly with surface albedo, solar zenith angle and cloud liquid water. Longwave cloud forcing was larger and generally ranged between 65 and 85 W m-2, except when the cloud fraction was tenuous or contained little liquid water; thus the net effect of the clouds was to warm the surface. Both cold periods occurred under tenuous, or altogether absent, low-level clouds containing little liquid water, effectively reducing the cloud greenhouse effect. Freeze-up progression was enhanced by a combination of increasing solar zenith angles and surface albedo, while inhibited by a large, positive surface cloud forcing until a new air-mass with considerably less cloudiness advected over the experiment area. |
format |
Article in Journal/Newspaper |
author |
Sedlar, J Tjernstrom, M Mauritsen, T Shupe, MD Brooks, IM Persson, POG Birch, CE Leck, C Sirevaag, A Nicolaus, M |
spellingShingle |
Sedlar, J Tjernstrom, M Mauritsen, T Shupe, MD Brooks, IM Persson, POG Birch, CE Leck, C Sirevaag, A Nicolaus, M A transitioning Arctic surface energy budget: the impacts of solar zenith angle, surface albedo and cloud radiative forcing |
author_facet |
Sedlar, J Tjernstrom, M Mauritsen, T Shupe, MD Brooks, IM Persson, POG Birch, CE Leck, C Sirevaag, A Nicolaus, M |
author_sort |
Sedlar, J |
title |
A transitioning Arctic surface energy budget: the impacts of solar zenith angle, surface albedo and cloud radiative forcing |
title_short |
A transitioning Arctic surface energy budget: the impacts of solar zenith angle, surface albedo and cloud radiative forcing |
title_full |
A transitioning Arctic surface energy budget: the impacts of solar zenith angle, surface albedo and cloud radiative forcing |
title_fullStr |
A transitioning Arctic surface energy budget: the impacts of solar zenith angle, surface albedo and cloud radiative forcing |
title_full_unstemmed |
A transitioning Arctic surface energy budget: the impacts of solar zenith angle, surface albedo and cloud radiative forcing |
title_sort |
transitioning arctic surface energy budget: the impacts of solar zenith angle, surface albedo and cloud radiative forcing |
publisher |
Springer Verlag |
publishDate |
2011 |
url |
https://eprints.whiterose.ac.uk/77217/ https://eprints.whiterose.ac.uk/77217/7/sedlar_etal_v2.1_with_coversheet.pdf https://doi.org/10.1007/s00382-010-0937-5 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
albedo Arctic Arctic Sea ice |
genre_facet |
albedo Arctic Arctic Sea ice |
op_relation |
https://eprints.whiterose.ac.uk/77217/7/sedlar_etal_v2.1_with_coversheet.pdf Sedlar, J, Tjernstrom, M, Mauritsen, T et al. (7 more authors) (2011) A transitioning Arctic surface energy budget: the impacts of solar zenith angle, surface albedo and cloud radiative forcing. Climate Dynamics, 37 (7-8). 1643 - 1660. ISSN 0930-7575 |
op_doi |
https://doi.org/10.1007/s00382-010-0937-5 |
container_title |
Climate Dynamics |
container_volume |
37 |
container_issue |
7-8 |
container_start_page |
1643 |
op_container_end_page |
1660 |
_version_ |
1800740780386549760 |