Double Diffusion As a Driver of Turbulence in the Stratified Boundary Layer Beneath George VI Ice Shelf
<jats:title>Abstract</jats:title><jats:p>Warmer and more persistent intrusions of Circumpolar Deep Water (CDW) onto the West Antarctic Peninsula are a key driver of the recent increase in ice shelf mass loss. The relatively warm and salty CDW is thought to be mixed up to the base o...
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ftunivcam:oai:www.repository.cam.ac.uk:1810/334693 2024-02-04T09:53:27+01:00 Double Diffusion As a Driver of Turbulence in the Stratified Boundary Layer Beneath George VI Ice Shelf Middleton, L Davis, PED Taylor, JR Nicholls, KW 2022-03-05T09:00:14Z text/xml application/pdf https://www.repository.cam.ac.uk/handle/1810/334693 https://doi.org/10.17863/CAM.82111 en eng eng American Geophysical Union (AGU) http://dx.doi.org/10.1029/2021gl096119 Geophysical Research Letters https://www.repository.cam.ac.uk/handle/1810/334693 doi:10.17863/CAM.82111 turbulence ice shelf boundary layer double diffusion Article 2022 ftunivcam https://doi.org/10.17863/CAM.82111 2024-01-11T23:32:53Z <jats:title>Abstract</jats:title><jats:p>Warmer and more persistent intrusions of Circumpolar Deep Water (CDW) onto the West Antarctic Peninsula are a key driver of the recent increase in ice shelf mass loss. The relatively warm and salty CDW is thought to be mixed up to the base of the ice shelves via shear‐driven turbulence where it has a high capacity to melt the ice. We analyze data from a year‐long mooring beneath George VI Ice Shelf at a location where double‐diffusive layering was observed. The turbulent dissipation rates do not vary with mean flow speed, suggesting shear‐driven mixing is not the driver of basal melt at this site. Instead, we predict the observed dissipation using a new method that links along‐isopycnal stirring of temperature anomalies with double‐diffusive convection. Our work suggests that along‐isopycnal temperature variance may be a stronger indicator of melt than flow speed within strongly stratified ice shelf‐ocean boundary layers.</jats:p> Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf Ice Shelves Apollo - University of Cambridge Repository Antarctic Antarctic Peninsula George VI Ice Shelf ENVELOPE(-67.840,-67.840,-71.692,-71.692) |
institution |
Open Polar |
collection |
Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
language |
English |
topic |
turbulence ice shelf boundary layer double diffusion |
spellingShingle |
turbulence ice shelf boundary layer double diffusion Middleton, L Davis, PED Taylor, JR Nicholls, KW Double Diffusion As a Driver of Turbulence in the Stratified Boundary Layer Beneath George VI Ice Shelf |
topic_facet |
turbulence ice shelf boundary layer double diffusion |
description |
<jats:title>Abstract</jats:title><jats:p>Warmer and more persistent intrusions of Circumpolar Deep Water (CDW) onto the West Antarctic Peninsula are a key driver of the recent increase in ice shelf mass loss. The relatively warm and salty CDW is thought to be mixed up to the base of the ice shelves via shear‐driven turbulence where it has a high capacity to melt the ice. We analyze data from a year‐long mooring beneath George VI Ice Shelf at a location where double‐diffusive layering was observed. The turbulent dissipation rates do not vary with mean flow speed, suggesting shear‐driven mixing is not the driver of basal melt at this site. Instead, we predict the observed dissipation using a new method that links along‐isopycnal stirring of temperature anomalies with double‐diffusive convection. Our work suggests that along‐isopycnal temperature variance may be a stronger indicator of melt than flow speed within strongly stratified ice shelf‐ocean boundary layers.</jats:p> |
format |
Article in Journal/Newspaper |
author |
Middleton, L Davis, PED Taylor, JR Nicholls, KW |
author_facet |
Middleton, L Davis, PED Taylor, JR Nicholls, KW |
author_sort |
Middleton, L |
title |
Double Diffusion As a Driver of Turbulence in the Stratified Boundary Layer Beneath George VI Ice Shelf |
title_short |
Double Diffusion As a Driver of Turbulence in the Stratified Boundary Layer Beneath George VI Ice Shelf |
title_full |
Double Diffusion As a Driver of Turbulence in the Stratified Boundary Layer Beneath George VI Ice Shelf |
title_fullStr |
Double Diffusion As a Driver of Turbulence in the Stratified Boundary Layer Beneath George VI Ice Shelf |
title_full_unstemmed |
Double Diffusion As a Driver of Turbulence in the Stratified Boundary Layer Beneath George VI Ice Shelf |
title_sort |
double diffusion as a driver of turbulence in the stratified boundary layer beneath george vi ice shelf |
publisher |
American Geophysical Union (AGU) |
publishDate |
2022 |
url |
https://www.repository.cam.ac.uk/handle/1810/334693 https://doi.org/10.17863/CAM.82111 |
long_lat |
ENVELOPE(-67.840,-67.840,-71.692,-71.692) |
geographic |
Antarctic Antarctic Peninsula George VI Ice Shelf |
geographic_facet |
Antarctic Antarctic Peninsula George VI Ice Shelf |
genre |
Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf Ice Shelves |
genre_facet |
Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf Ice Shelves |
op_relation |
https://www.repository.cam.ac.uk/handle/1810/334693 doi:10.17863/CAM.82111 |
op_doi |
https://doi.org/10.17863/CAM.82111 |
_version_ |
1789965949860839424 |