2242 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 38 Large-Scale Oceanographic Constraints on the Distribution of Melting and Freezing under Ice Shelves
Previous studies suggest that ice shelves experience asymmetric melting and freezing. Topography may constrain oceanic circulation (and thus basal melt–freeze patterns) through its influence on the potential vorticity (PV) field. However, melting and freezing induce a local circulation that may modi...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.143.4988 2023-05-15T16:41:53+02:00 2242 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 38 Large-Scale Oceanographic Constraints on the Distribution of Melting and Freezing under Ice Shelves Christopher M. Little The Pennsylvania State University CiteSeerX Archives 2007 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.143.4988 http://www.gfdl.noaa.gov/reference/bibliography/2008/cml0801.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.143.4988 http://www.gfdl.noaa.gov/reference/bibliography/2008/cml0801.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.gfdl.noaa.gov/reference/bibliography/2008/cml0801.pdf text 2007 ftciteseerx 2016-01-07T15:02:41Z Previous studies suggest that ice shelves experience asymmetric melting and freezing. Topography may constrain oceanic circulation (and thus basal melt–freeze patterns) through its influence on the potential vorticity (PV) field. However, melting and freezing induce a local circulation that may modify locations of heat transport to the ice shelf. This paper investigates the influence of buoyancy fluxes on locations of melting and freezing under different bathymetric conditions. An idealized set of numerical simulations (the “decoupled ” simulations) employs spatially and temporally fixed diapycnal fluxes. These experiments, in combination with scaling considerations, indicate that while flow in the interior is governed by large-scale topographic gradients, recirculation plumes dominate near buoyancy fluxes. Thermodynamically decoupled models are then compared to those in which ice–ocean heat and freshwater fluxes are driven by the interior flow (the “coupled ” simulations). Near the southern boundary, strong cyclonic flow forced by melt-induced upwelling drives inflow and melting to the east. Recirculation is less evident in the upper water column, as shoaling of meltwater-freshened layers dissipates the dynamic influence of buoyancy forcing, yet freezing remains intensified in the west. In coupled simulations, the flow throughout the cavity is relatively insensitive to bathymetry; stratification, the slope of the ice shelf, and strong, meridionally distributed buoyancy fluxes weaken its influence. 1. Text Ice Shelf Ice Shelves Unknown |
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English |
description |
Previous studies suggest that ice shelves experience asymmetric melting and freezing. Topography may constrain oceanic circulation (and thus basal melt–freeze patterns) through its influence on the potential vorticity (PV) field. However, melting and freezing induce a local circulation that may modify locations of heat transport to the ice shelf. This paper investigates the influence of buoyancy fluxes on locations of melting and freezing under different bathymetric conditions. An idealized set of numerical simulations (the “decoupled ” simulations) employs spatially and temporally fixed diapycnal fluxes. These experiments, in combination with scaling considerations, indicate that while flow in the interior is governed by large-scale topographic gradients, recirculation plumes dominate near buoyancy fluxes. Thermodynamically decoupled models are then compared to those in which ice–ocean heat and freshwater fluxes are driven by the interior flow (the “coupled ” simulations). Near the southern boundary, strong cyclonic flow forced by melt-induced upwelling drives inflow and melting to the east. Recirculation is less evident in the upper water column, as shoaling of meltwater-freshened layers dissipates the dynamic influence of buoyancy forcing, yet freezing remains intensified in the west. In coupled simulations, the flow throughout the cavity is relatively insensitive to bathymetry; stratification, the slope of the ice shelf, and strong, meridionally distributed buoyancy fluxes weaken its influence. 1. |
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The Pennsylvania State University CiteSeerX Archives |
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Text |
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Christopher M. Little |
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Christopher M. Little 2242 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 38 Large-Scale Oceanographic Constraints on the Distribution of Melting and Freezing under Ice Shelves |
author_facet |
Christopher M. Little |
author_sort |
Christopher M. Little |
title |
2242 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 38 Large-Scale Oceanographic Constraints on the Distribution of Melting and Freezing under Ice Shelves |
title_short |
2242 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 38 Large-Scale Oceanographic Constraints on the Distribution of Melting and Freezing under Ice Shelves |
title_full |
2242 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 38 Large-Scale Oceanographic Constraints on the Distribution of Melting and Freezing under Ice Shelves |
title_fullStr |
2242 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 38 Large-Scale Oceanographic Constraints on the Distribution of Melting and Freezing under Ice Shelves |
title_full_unstemmed |
2242 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME 38 Large-Scale Oceanographic Constraints on the Distribution of Melting and Freezing under Ice Shelves |
title_sort |
2242 journal of physical oceanography volume 38 large-scale oceanographic constraints on the distribution of melting and freezing under ice shelves |
publishDate |
2007 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.143.4988 http://www.gfdl.noaa.gov/reference/bibliography/2008/cml0801.pdf |
genre |
Ice Shelf Ice Shelves |
genre_facet |
Ice Shelf Ice Shelves |
op_source |
http://www.gfdl.noaa.gov/reference/bibliography/2008/cml0801.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.143.4988 http://www.gfdl.noaa.gov/reference/bibliography/2008/cml0801.pdf |
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_version_ |
1766032351469502464 |