Impacts of oceanic and atmospheric heat transports on sea-ice extent
Climate-model biases in Ocean Heat Transport (OHT) have been proposed as a major contributor to uncertainties in projections of sea-ice extent. To better understand the impact of OHT on sea-ice extent and compare it to that of Atmospheric Heat Transport (AHT), an idealised, zonally-averaged Energy-B...
Published in: | Journal of Climate |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Meteorological Society
2020
|
Subjects: | |
Online Access: | https://centaur.reading.ac.uk/91173/ https://centaur.reading.ac.uk/91173/9/jclid190761.pdf https://centaur.reading.ac.uk/91173/1/Aylmer_etal_20_accepted.pdf |
id |
ftunivreading:oai:centaur.reading.ac.uk:91173 |
---|---|
record_format |
openpolar |
spelling |
ftunivreading:oai:centaur.reading.ac.uk:91173 2024-06-23T07:56:41+00:00 Impacts of oceanic and atmospheric heat transports on sea-ice extent Aylmer, Jake Ferreira, David Feltham, Danny 2020-08-15 text https://centaur.reading.ac.uk/91173/ https://centaur.reading.ac.uk/91173/9/jclid190761.pdf https://centaur.reading.ac.uk/91173/1/Aylmer_etal_20_accepted.pdf en eng American Meteorological Society https://centaur.reading.ac.uk/91173/9/jclid190761.pdf https://centaur.reading.ac.uk/91173/1/Aylmer_etal_20_accepted.pdf Aylmer, J. <https://centaur.reading.ac.uk/view/creators/90011220.html> orcid:0000-0002-5159-0608 , Ferreira, D. <https://centaur.reading.ac.uk/view/creators/90005370.html> orcid:0000-0003-3243-9774 and Feltham, D. <https://centaur.reading.ac.uk/view/creators/90004991.html> orcid:0000-0003-2289-014X (2020) Impacts of oceanic and atmospheric heat transports on sea-ice extent. Journal of Climate, 33 (16). pp. 7197-7215. ISSN 1520-0442 doi: https://doi.org/10.1175/JCLI-D-19-0761.1 <https://doi.org/10.1175/JCLI-D-19-0761.1> cc_by_4 Article PeerReviewed 2020 ftunivreading https://doi.org/10.1175/JCLI-D-19-0761.1 2024-06-11T15:10:14Z Climate-model biases in Ocean Heat Transport (OHT) have been proposed as a major contributor to uncertainties in projections of sea-ice extent. To better understand the impact of OHT on sea-ice extent and compare it to that of Atmospheric Heat Transport (AHT), an idealised, zonally-averaged Energy-Balance Model (EBM) is developed. This is distinguished from previous EBM work by coupling a diffusive mixed-layer OHT and a prescribed OHT contribution, with an atmospheric EBM and a reduced-complexity sea-ice model. The ice-edge latitude is roughly linearly related to the convergence of each heat transport component, with different sensitivities depending on whether the ice cover is perennial or seasonal. In both regimes, Bjerknes Compensation (BC) occurs such that the response of AHT partially offsets the impact of changing OHT. As a result, the effective sensitivity of ice-edge retreat to increasing OHT is only ∼2/3 of the actual sensitivity (i.e. eliminating the BC effect). In the perennial regime, the sensitivity of the ice edge to OHT is about twice that to AHT, while in the seasonal regime they are similar. The ratio of sensitivities is, to leading order, determined by atmospheric longwave feedback parameters in the perennial regime. Here, there is no parameter range in which the ice edge is more sensitive to AHT than OHT. Article in Journal/Newspaper Sea ice CentAUR: Central Archive at the University of Reading Journal of Climate 33 16 7197 7215 |
institution |
Open Polar |
collection |
CentAUR: Central Archive at the University of Reading |
op_collection_id |
ftunivreading |
language |
English |
description |
Climate-model biases in Ocean Heat Transport (OHT) have been proposed as a major contributor to uncertainties in projections of sea-ice extent. To better understand the impact of OHT on sea-ice extent and compare it to that of Atmospheric Heat Transport (AHT), an idealised, zonally-averaged Energy-Balance Model (EBM) is developed. This is distinguished from previous EBM work by coupling a diffusive mixed-layer OHT and a prescribed OHT contribution, with an atmospheric EBM and a reduced-complexity sea-ice model. The ice-edge latitude is roughly linearly related to the convergence of each heat transport component, with different sensitivities depending on whether the ice cover is perennial or seasonal. In both regimes, Bjerknes Compensation (BC) occurs such that the response of AHT partially offsets the impact of changing OHT. As a result, the effective sensitivity of ice-edge retreat to increasing OHT is only ∼2/3 of the actual sensitivity (i.e. eliminating the BC effect). In the perennial regime, the sensitivity of the ice edge to OHT is about twice that to AHT, while in the seasonal regime they are similar. The ratio of sensitivities is, to leading order, determined by atmospheric longwave feedback parameters in the perennial regime. Here, there is no parameter range in which the ice edge is more sensitive to AHT than OHT. |
format |
Article in Journal/Newspaper |
author |
Aylmer, Jake Ferreira, David Feltham, Danny |
spellingShingle |
Aylmer, Jake Ferreira, David Feltham, Danny Impacts of oceanic and atmospheric heat transports on sea-ice extent |
author_facet |
Aylmer, Jake Ferreira, David Feltham, Danny |
author_sort |
Aylmer, Jake |
title |
Impacts of oceanic and atmospheric heat transports on sea-ice extent |
title_short |
Impacts of oceanic and atmospheric heat transports on sea-ice extent |
title_full |
Impacts of oceanic and atmospheric heat transports on sea-ice extent |
title_fullStr |
Impacts of oceanic and atmospheric heat transports on sea-ice extent |
title_full_unstemmed |
Impacts of oceanic and atmospheric heat transports on sea-ice extent |
title_sort |
impacts of oceanic and atmospheric heat transports on sea-ice extent |
publisher |
American Meteorological Society |
publishDate |
2020 |
url |
https://centaur.reading.ac.uk/91173/ https://centaur.reading.ac.uk/91173/9/jclid190761.pdf https://centaur.reading.ac.uk/91173/1/Aylmer_etal_20_accepted.pdf |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
https://centaur.reading.ac.uk/91173/9/jclid190761.pdf https://centaur.reading.ac.uk/91173/1/Aylmer_etal_20_accepted.pdf Aylmer, J. <https://centaur.reading.ac.uk/view/creators/90011220.html> orcid:0000-0002-5159-0608 , Ferreira, D. <https://centaur.reading.ac.uk/view/creators/90005370.html> orcid:0000-0003-3243-9774 and Feltham, D. <https://centaur.reading.ac.uk/view/creators/90004991.html> orcid:0000-0003-2289-014X (2020) Impacts of oceanic and atmospheric heat transports on sea-ice extent. Journal of Climate, 33 (16). pp. 7197-7215. ISSN 1520-0442 doi: https://doi.org/10.1175/JCLI-D-19-0761.1 <https://doi.org/10.1175/JCLI-D-19-0761.1> |
op_rights |
cc_by_4 |
op_doi |
https://doi.org/10.1175/JCLI-D-19-0761.1 |
container_title |
Journal of Climate |
container_volume |
33 |
container_issue |
16 |
container_start_page |
7197 |
op_container_end_page |
7215 |
_version_ |
1802649975285350400 |