Simulation of subice shelf melt rates in a general circulation model: Velocity-dependent transfer and the role of friction
Two parameterizations of turbulent boundary layer processes at the interface between an ice shelf and the ocean beneath are investigated in terms of their impact on simulated melt rates and feedbacks. The parameterizations differ in the transfer coefficients for heat and freshwater fluxes. In their...
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Wiley
2014
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/35365/ https://epic.awi.de/id/eprint/35365/1/dansereau-etal.pdf http://onlinelibrary.wiley.com/doi/10.1002/2013JC008846/abstract;jsessionid=5C8D28BA010D32FA17A9B896292774EE.f01t02 https://hdl.handle.net/10013/epic.43375 https://hdl.handle.net/10013/epic.43375.d001 |
id |
ftawi:oai:epic.awi.de:35365 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:35365 2023-05-15T13:40:26+02:00 Simulation of subice shelf melt rates in a general circulation model: Velocity-dependent transfer and the role of friction Dansereau, Véronique Heimbach, Patrick Losch, Martin 2014-03 application/pdf https://epic.awi.de/id/eprint/35365/ https://epic.awi.de/id/eprint/35365/1/dansereau-etal.pdf http://onlinelibrary.wiley.com/doi/10.1002/2013JC008846/abstract;jsessionid=5C8D28BA010D32FA17A9B896292774EE.f01t02 https://hdl.handle.net/10013/epic.43375 https://hdl.handle.net/10013/epic.43375.d001 unknown Wiley https://epic.awi.de/id/eprint/35365/1/dansereau-etal.pdf https://hdl.handle.net/10013/epic.43375.d001 Dansereau, V. , Heimbach, P. and Losch, M. orcid:0000-0002-3824-5244 (2014) Simulation of subice shelf melt rates in a general circulation model: Velocity-dependent transfer and the role of friction , Journal of Geophysical Research: Oceans, 119 (3), pp. 1765-1790 . doi:10.1002/2013JC008846 <https://doi.org/10.1002/2013JC008846> , hdl:10013/epic.43375 EPIC3Journal of Geophysical Research: Oceans, Wiley, 119(3), pp. 1765-1790, ISSN: 2169-9291 Article isiRev 2014 ftawi https://doi.org/10.1002/2013JC008846 2021-12-24T15:39:29Z Two parameterizations of turbulent boundary layer processes at the interface between an ice shelf and the ocean beneath are investigated in terms of their impact on simulated melt rates and feedbacks. The parameterizations differ in the transfer coefficients for heat and freshwater fluxes. In their simplest form, they are assumed constant and hence are independent of the velocity of ocean currents at the ice shelf base. An augmented melt rate parameterization accounts for frictional turbulence via transfer coefficients that do depend on boundary layer current velocities via a drag law. In simulations with both parameterizations for idealized as well as realistic cavity geometries under Pine Island Ice Shelf, West Antarctica, significant differences in melt rate patterns between the velocity-independent and velocity-dependent formulations are found. While patterns are strongly correlated to those of thermal forcing for velocity-independent transfer coefficients, melting in the case of velocity-dependent coefficients is collocated with regions of high boundary layer currents, in particular where rapid plume outflow occurs. Both positive and negative feedbacks between melt rates, boundary layer temperature, velocities, and buoyancy fluxes are identified. Melt rates are found to increase with increasing drag coefficient inline image, in agreement with plume model simulations, but optimal values of Cd inferred from plume models are not easily transferable. Uncertainties therefore remain, both regarding simulated melt rate spatial distributions and magnitudes. Article in Journal/Newspaper Antarc* Antarctica Ice Shelf Pine Island West Antarctica Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) West Antarctica Journal of Geophysical Research: Oceans 119 3 1765 1790 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Two parameterizations of turbulent boundary layer processes at the interface between an ice shelf and the ocean beneath are investigated in terms of their impact on simulated melt rates and feedbacks. The parameterizations differ in the transfer coefficients for heat and freshwater fluxes. In their simplest form, they are assumed constant and hence are independent of the velocity of ocean currents at the ice shelf base. An augmented melt rate parameterization accounts for frictional turbulence via transfer coefficients that do depend on boundary layer current velocities via a drag law. In simulations with both parameterizations for idealized as well as realistic cavity geometries under Pine Island Ice Shelf, West Antarctica, significant differences in melt rate patterns between the velocity-independent and velocity-dependent formulations are found. While patterns are strongly correlated to those of thermal forcing for velocity-independent transfer coefficients, melting in the case of velocity-dependent coefficients is collocated with regions of high boundary layer currents, in particular where rapid plume outflow occurs. Both positive and negative feedbacks between melt rates, boundary layer temperature, velocities, and buoyancy fluxes are identified. Melt rates are found to increase with increasing drag coefficient inline image, in agreement with plume model simulations, but optimal values of Cd inferred from plume models are not easily transferable. Uncertainties therefore remain, both regarding simulated melt rate spatial distributions and magnitudes. |
format |
Article in Journal/Newspaper |
author |
Dansereau, Véronique Heimbach, Patrick Losch, Martin |
spellingShingle |
Dansereau, Véronique Heimbach, Patrick Losch, Martin Simulation of subice shelf melt rates in a general circulation model: Velocity-dependent transfer and the role of friction |
author_facet |
Dansereau, Véronique Heimbach, Patrick Losch, Martin |
author_sort |
Dansereau, Véronique |
title |
Simulation of subice shelf melt rates in a general circulation model: Velocity-dependent transfer and the role of friction |
title_short |
Simulation of subice shelf melt rates in a general circulation model: Velocity-dependent transfer and the role of friction |
title_full |
Simulation of subice shelf melt rates in a general circulation model: Velocity-dependent transfer and the role of friction |
title_fullStr |
Simulation of subice shelf melt rates in a general circulation model: Velocity-dependent transfer and the role of friction |
title_full_unstemmed |
Simulation of subice shelf melt rates in a general circulation model: Velocity-dependent transfer and the role of friction |
title_sort |
simulation of subice shelf melt rates in a general circulation model: velocity-dependent transfer and the role of friction |
publisher |
Wiley |
publishDate |
2014 |
url |
https://epic.awi.de/id/eprint/35365/ https://epic.awi.de/id/eprint/35365/1/dansereau-etal.pdf http://onlinelibrary.wiley.com/doi/10.1002/2013JC008846/abstract;jsessionid=5C8D28BA010D32FA17A9B896292774EE.f01t02 https://hdl.handle.net/10013/epic.43375 https://hdl.handle.net/10013/epic.43375.d001 |
geographic |
West Antarctica |
geographic_facet |
West Antarctica |
genre |
Antarc* Antarctica Ice Shelf Pine Island West Antarctica |
genre_facet |
Antarc* Antarctica Ice Shelf Pine Island West Antarctica |
op_source |
EPIC3Journal of Geophysical Research: Oceans, Wiley, 119(3), pp. 1765-1790, ISSN: 2169-9291 |
op_relation |
https://epic.awi.de/id/eprint/35365/1/dansereau-etal.pdf https://hdl.handle.net/10013/epic.43375.d001 Dansereau, V. , Heimbach, P. and Losch, M. orcid:0000-0002-3824-5244 (2014) Simulation of subice shelf melt rates in a general circulation model: Velocity-dependent transfer and the role of friction , Journal of Geophysical Research: Oceans, 119 (3), pp. 1765-1790 . doi:10.1002/2013JC008846 <https://doi.org/10.1002/2013JC008846> , hdl:10013/epic.43375 |
op_doi |
https://doi.org/10.1002/2013JC008846 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
119 |
container_issue |
3 |
container_start_page |
1765 |
op_container_end_page |
1790 |
_version_ |
1766133942586441728 |