Foehn jets over the Larsen C Ice Shelf, Antarctica
Previously unknown foehn jets have been identified to the east of the Antarctic Peninsula (AP) above the Larsen C Ice Shelf. These jets have major implications for the east coast of the AP, a region of rapid climatic warming and where two large sections of ice shelf have collapsed in recent years. D...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/508861/ https://nora.nerc.ac.uk/id/eprint/508861/1/qj2382.pdf |
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ftnerc:oai:nora.nerc.ac.uk:508861 2023-05-15T13:48:08+02:00 Foehn jets over the Larsen C Ice Shelf, Antarctica Elvidge, Andrew D. Renfrew, Ian A. King, John C. Orr, Andrew Lachlan-Cope, Tom A. Weeks, Mark Gray, Sue L. 2015-04 text http://nora.nerc.ac.uk/id/eprint/508861/ https://nora.nerc.ac.uk/id/eprint/508861/1/qj2382.pdf en eng Wiley https://nora.nerc.ac.uk/id/eprint/508861/1/qj2382.pdf Elvidge, Andrew D.; Renfrew, Ian A.; King, John C. orcid:0000-0003-3315-7568 Orr, Andrew orcid:0000-0001-5111-8402 Lachlan-Cope, Tom A. orcid:0000-0002-0657-3235 Weeks, Mark; Gray, Sue L. 2015 Foehn jets over the Larsen C Ice Shelf, Antarctica. Quarterly Journal of the Royal Meteorological Society, 141 (688). 698-713. https://doi.org/10.1002/qj.2382 <https://doi.org/10.1002/qj.2382> cc_by_4 CC-BY Publication - Article PeerReviewed 2015 ftnerc https://doi.org/10.1002/qj.2382 2023-02-04T19:40:31Z Previously unknown foehn jets have been identified to the east of the Antarctic Peninsula (AP) above the Larsen C Ice Shelf. These jets have major implications for the east coast of the AP, a region of rapid climatic warming and where two large sections of ice shelf have collapsed in recent years. During three foehn events across the AP, leeside warming and drying is seen in new aircraft observations and simulated well by the Met Office Unified Model (MetUM) at ∼1.5 km grid spacing. In case A, weak southwesterly flow and an elevated upwind inversion characterise a highly nonlinear flow regime with upwind flow blocking. In case C strong northwesterly winds characterise a relatively linear case with little upwind flow blocking. Case B resides somewhere between the two in flow regime linearity. The foehn jets – apparent in aircraft observations where available and MetUM simulations of all three cases – are mesoscale features (up to 60 km in width) originating from the mouths of leeside inlets. Through back trajectory analysis they are identified as a type of gap flow. In cases A and B the jets are distinct, being strongly accelerated relative to the background flow, and confined to low levels above the Larsen C Ice Shelf. They resemble the ‘shallow foehn’ of the Alps. Case C resembles a case of ‘deep foehn’, with the jets less distinct. The foehn jets are considerably cooler and moister relative to adjacent regions of calmer foehn air. This is due to a dampened foehn effect in the jet regions: in case A the jets have lower upwind source regions, and in the more linear case C there is less diabatic warming and precipitation along jet trajectories due to the reduced orographic uplift across the mountain passes. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Quarterly Journal of the Royal Meteorological Society 141 688 698 713 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Previously unknown foehn jets have been identified to the east of the Antarctic Peninsula (AP) above the Larsen C Ice Shelf. These jets have major implications for the east coast of the AP, a region of rapid climatic warming and where two large sections of ice shelf have collapsed in recent years. During three foehn events across the AP, leeside warming and drying is seen in new aircraft observations and simulated well by the Met Office Unified Model (MetUM) at ∼1.5 km grid spacing. In case A, weak southwesterly flow and an elevated upwind inversion characterise a highly nonlinear flow regime with upwind flow blocking. In case C strong northwesterly winds characterise a relatively linear case with little upwind flow blocking. Case B resides somewhere between the two in flow regime linearity. The foehn jets – apparent in aircraft observations where available and MetUM simulations of all three cases – are mesoscale features (up to 60 km in width) originating from the mouths of leeside inlets. Through back trajectory analysis they are identified as a type of gap flow. In cases A and B the jets are distinct, being strongly accelerated relative to the background flow, and confined to low levels above the Larsen C Ice Shelf. They resemble the ‘shallow foehn’ of the Alps. Case C resembles a case of ‘deep foehn’, with the jets less distinct. The foehn jets are considerably cooler and moister relative to adjacent regions of calmer foehn air. This is due to a dampened foehn effect in the jet regions: in case A the jets have lower upwind source regions, and in the more linear case C there is less diabatic warming and precipitation along jet trajectories due to the reduced orographic uplift across the mountain passes. |
format |
Article in Journal/Newspaper |
author |
Elvidge, Andrew D. Renfrew, Ian A. King, John C. Orr, Andrew Lachlan-Cope, Tom A. Weeks, Mark Gray, Sue L. |
spellingShingle |
Elvidge, Andrew D. Renfrew, Ian A. King, John C. Orr, Andrew Lachlan-Cope, Tom A. Weeks, Mark Gray, Sue L. Foehn jets over the Larsen C Ice Shelf, Antarctica |
author_facet |
Elvidge, Andrew D. Renfrew, Ian A. King, John C. Orr, Andrew Lachlan-Cope, Tom A. Weeks, Mark Gray, Sue L. |
author_sort |
Elvidge, Andrew D. |
title |
Foehn jets over the Larsen C Ice Shelf, Antarctica |
title_short |
Foehn jets over the Larsen C Ice Shelf, Antarctica |
title_full |
Foehn jets over the Larsen C Ice Shelf, Antarctica |
title_fullStr |
Foehn jets over the Larsen C Ice Shelf, Antarctica |
title_full_unstemmed |
Foehn jets over the Larsen C Ice Shelf, Antarctica |
title_sort |
foehn jets over the larsen c ice shelf, antarctica |
publisher |
Wiley |
publishDate |
2015 |
url |
http://nora.nerc.ac.uk/id/eprint/508861/ https://nora.nerc.ac.uk/id/eprint/508861/1/qj2382.pdf |
geographic |
Antarctic The Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf |
op_relation |
https://nora.nerc.ac.uk/id/eprint/508861/1/qj2382.pdf Elvidge, Andrew D.; Renfrew, Ian A.; King, John C. orcid:0000-0003-3315-7568 Orr, Andrew orcid:0000-0001-5111-8402 Lachlan-Cope, Tom A. orcid:0000-0002-0657-3235 Weeks, Mark; Gray, Sue L. 2015 Foehn jets over the Larsen C Ice Shelf, Antarctica. Quarterly Journal of the Royal Meteorological Society, 141 (688). 698-713. https://doi.org/10.1002/qj.2382 <https://doi.org/10.1002/qj.2382> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1002/qj.2382 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
141 |
container_issue |
688 |
container_start_page |
698 |
op_container_end_page |
713 |
_version_ |
1766248784392617984 |