The impact of föhn winds on surface energy balance during the 2010-11 melt season over Larsen C Ice Shelf, Antarctica
We use model data from the Antarctic Mesoscale Prediction System (AMPS), measurements from automatic weather stations and satellite observations to investigate the association between surface energy balance (SEB), surface melt and the occurrence of föhn winds over Larsen C Ice Shelf (Antarctic Penin...
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American Geophysical Union
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ftnerc:oai:nora.nerc.ac.uk:516577 2023-05-15T13:49:34+02:00 The impact of föhn winds on surface energy balance during the 2010-11 melt season over Larsen C Ice Shelf, Antarctica King, J.C. Kirchgaessner, A. Bevan, S. Elvidge, A.D. Kuipers Munneke, P. Luckman, A. Orr, A. Renfrew, I.A. van den Broeke, M.R. 2017-11 text http://nora.nerc.ac.uk/id/eprint/516577/ https://nora.nerc.ac.uk/id/eprint/516577/1/King_et_al-2017-Journal_of_Geophysical_Research__Atmospheres.pdf http://onlinelibrary.wiley.com/doi/10.1002/2017JD026809/full en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/516577/1/King_et_al-2017-Journal_of_Geophysical_Research__Atmospheres.pdf King, J.C. orcid:0000-0003-3315-7568 Kirchgaessner, A. orcid:0000-0001-7483-3652 Bevan, S.; Elvidge, A.D.; Kuipers Munneke, P.; Luckman, A.; Orr, A. orcid:0000-0001-5111-8402 Renfrew, I.A.; van den Broeke, M.R. 2017 The impact of föhn winds on surface energy balance during the 2010-11 melt season over Larsen C Ice Shelf, Antarctica. Journal of Geophysical Research: Atmospheres, 122 (22). 12062-12076. https://doi.org/10.1002/2017JD026809 <https://doi.org/10.1002/2017JD026809> Publication - Article PeerReviewed 2017 ftnerc https://doi.org/10.1002/2017JD026809 2023-02-04T19:44:39Z We use model data from the Antarctic Mesoscale Prediction System (AMPS), measurements from automatic weather stations and satellite observations to investigate the association between surface energy balance (SEB), surface melt and the occurrence of föhn winds over Larsen C Ice Shelf (Antarctic Peninsula) over the period November 2010 – March 2011. Föhn conditions occurred for over 20% of the time during this period and are associated with increased air temperatures and decreased relative humidity (relative to non-föhn conditions) over the western part of the ice shelf. During föhn conditions, the downward turbulent flux of sensible heat and the downwelling shortwave radiation both increase. However, in AMPS, these warming tendencies are largely balanced by an increase in upward latent heat flux and a decrease in downwelling longwave radiation so the impact of föhn on the modelled net SEB is small. This balance is highly sensitive to the representation of surface energy fluxes in the model and limited validation data suggest that AMPS may underestimate the sensitivity of SEB and melt to föhn. There is broad agreement on the spatial pattern of melt between the model and satellite observations but disagreement in the frequency with which melt occurs. Satellite observations indicate localized regions of persistent melt along the foot of the Antarctic Peninsula mountains which are not simulated by the model. Furthermore, melt is observed to persist in these regions during extended periods when föhn does not occur, suggesting that other factors may be important in controlling melt in these regions. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Antarctica Journal Ice Shelf Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Journal of Geophysical Research: Atmospheres 122 22 12,062 12,076 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
We use model data from the Antarctic Mesoscale Prediction System (AMPS), measurements from automatic weather stations and satellite observations to investigate the association between surface energy balance (SEB), surface melt and the occurrence of föhn winds over Larsen C Ice Shelf (Antarctic Peninsula) over the period November 2010 – March 2011. Föhn conditions occurred for over 20% of the time during this period and are associated with increased air temperatures and decreased relative humidity (relative to non-föhn conditions) over the western part of the ice shelf. During föhn conditions, the downward turbulent flux of sensible heat and the downwelling shortwave radiation both increase. However, in AMPS, these warming tendencies are largely balanced by an increase in upward latent heat flux and a decrease in downwelling longwave radiation so the impact of föhn on the modelled net SEB is small. This balance is highly sensitive to the representation of surface energy fluxes in the model and limited validation data suggest that AMPS may underestimate the sensitivity of SEB and melt to föhn. There is broad agreement on the spatial pattern of melt between the model and satellite observations but disagreement in the frequency with which melt occurs. Satellite observations indicate localized regions of persistent melt along the foot of the Antarctic Peninsula mountains which are not simulated by the model. Furthermore, melt is observed to persist in these regions during extended periods when föhn does not occur, suggesting that other factors may be important in controlling melt in these regions. |
format |
Article in Journal/Newspaper |
author |
King, J.C. Kirchgaessner, A. Bevan, S. Elvidge, A.D. Kuipers Munneke, P. Luckman, A. Orr, A. Renfrew, I.A. van den Broeke, M.R. |
spellingShingle |
King, J.C. Kirchgaessner, A. Bevan, S. Elvidge, A.D. Kuipers Munneke, P. Luckman, A. Orr, A. Renfrew, I.A. van den Broeke, M.R. The impact of föhn winds on surface energy balance during the 2010-11 melt season over Larsen C Ice Shelf, Antarctica |
author_facet |
King, J.C. Kirchgaessner, A. Bevan, S. Elvidge, A.D. Kuipers Munneke, P. Luckman, A. Orr, A. Renfrew, I.A. van den Broeke, M.R. |
author_sort |
King, J.C. |
title |
The impact of föhn winds on surface energy balance during the 2010-11 melt season over Larsen C Ice Shelf, Antarctica |
title_short |
The impact of föhn winds on surface energy balance during the 2010-11 melt season over Larsen C Ice Shelf, Antarctica |
title_full |
The impact of föhn winds on surface energy balance during the 2010-11 melt season over Larsen C Ice Shelf, Antarctica |
title_fullStr |
The impact of föhn winds on surface energy balance during the 2010-11 melt season over Larsen C Ice Shelf, Antarctica |
title_full_unstemmed |
The impact of föhn winds on surface energy balance during the 2010-11 melt season over Larsen C Ice Shelf, Antarctica |
title_sort |
impact of föhn winds on surface energy balance during the 2010-11 melt season over larsen c ice shelf, antarctica |
publisher |
American Geophysical Union |
publishDate |
2017 |
url |
http://nora.nerc.ac.uk/id/eprint/516577/ https://nora.nerc.ac.uk/id/eprint/516577/1/King_et_al-2017-Journal_of_Geophysical_Research__Atmospheres.pdf http://onlinelibrary.wiley.com/doi/10.1002/2017JD026809/full |
geographic |
Antarctic The Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Antarctica Journal Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Antarctica Journal Ice Shelf |
op_relation |
https://nora.nerc.ac.uk/id/eprint/516577/1/King_et_al-2017-Journal_of_Geophysical_Research__Atmospheres.pdf King, J.C. orcid:0000-0003-3315-7568 Kirchgaessner, A. orcid:0000-0001-7483-3652 Bevan, S.; Elvidge, A.D.; Kuipers Munneke, P.; Luckman, A.; Orr, A. orcid:0000-0001-5111-8402 Renfrew, I.A.; van den Broeke, M.R. 2017 The impact of föhn winds on surface energy balance during the 2010-11 melt season over Larsen C Ice Shelf, Antarctica. Journal of Geophysical Research: Atmospheres, 122 (22). 12062-12076. https://doi.org/10.1002/2017JD026809 <https://doi.org/10.1002/2017JD026809> |
op_doi |
https://doi.org/10.1002/2017JD026809 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
122 |
container_issue |
22 |
container_start_page |
12,062 |
op_container_end_page |
12,076 |
_version_ |
1766251653110956032 |