The Control of Polar Haloclines by Along-Isopycnal Diffusion in Climate Models
Increasing the value of along-isopycnal diffusivity in a coupled model is shown to lead to enhanced stability of North Atlantic Deep Water (NADW) formation with respect to freshwater (FW) perturbations. This is because the North Atlantic (NA) surface salinity budget is dominated by upward salt fluxe...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.492.7896 2023-05-15T17:13:54+02:00 The Control of Polar Haloclines by Along-Isopycnal Diffusion in Climate Models Willem P. Sijp Matthew H. England The Pennsylvania State University CiteSeerX Archives 2008 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.492.7896 http://web.maths.unsw.edu.au/~wsijp/papers/sijp_iso2.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.492.7896 http://web.maths.unsw.edu.au/~wsijp/papers/sijp_iso2.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://web.maths.unsw.edu.au/~wsijp/papers/sijp_iso2.pdf text 2008 ftciteseerx 2016-08-14T00:05:26Z Increasing the value of along-isopycnal diffusivity in a coupled model is shown to lead to enhanced stability of North Atlantic Deep Water (NADW) formation with respect to freshwater (FW) perturbations. This is because the North Atlantic (NA) surface salinity budget is dominated by upward salt fluxes resulting from winter convection for low values of along-isopycnal diffusivity, whereas along-isopycnal diffusion exerts a strong control on NA surface salinity at higher diffusivity values. Shutdown of wintertime convection in response to a FW pulse allows the development of a halocline responsible for the suppression of deep sinking. In contrast to convection, isopycnal salt diffusion proves a more robust mechanism for preventing the for-mation of a halocline, as surface freshening leads only to a flattening of isopycnals, leaving at least some diffusive removal of anomalous surface FW in place. As a result, multiple equilibria are altogether absent for sufficiently high values of isopycnal diffusivity. Furthermore, the surface salinity budget of the North Pacific is also dominated by along-isopycnal diffusion when diffusivity values are sufficiently high, leading to a breakdown of the permanent halocline there and the associated onset of deep-water formation. 1. Text NADW North Atlantic Deep Water North Atlantic Unknown Pacific |
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ftciteseerx |
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English |
description |
Increasing the value of along-isopycnal diffusivity in a coupled model is shown to lead to enhanced stability of North Atlantic Deep Water (NADW) formation with respect to freshwater (FW) perturbations. This is because the North Atlantic (NA) surface salinity budget is dominated by upward salt fluxes resulting from winter convection for low values of along-isopycnal diffusivity, whereas along-isopycnal diffusion exerts a strong control on NA surface salinity at higher diffusivity values. Shutdown of wintertime convection in response to a FW pulse allows the development of a halocline responsible for the suppression of deep sinking. In contrast to convection, isopycnal salt diffusion proves a more robust mechanism for preventing the for-mation of a halocline, as surface freshening leads only to a flattening of isopycnals, leaving at least some diffusive removal of anomalous surface FW in place. As a result, multiple equilibria are altogether absent for sufficiently high values of isopycnal diffusivity. Furthermore, the surface salinity budget of the North Pacific is also dominated by along-isopycnal diffusion when diffusivity values are sufficiently high, leading to a breakdown of the permanent halocline there and the associated onset of deep-water formation. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Willem P. Sijp Matthew H. England |
spellingShingle |
Willem P. Sijp Matthew H. England The Control of Polar Haloclines by Along-Isopycnal Diffusion in Climate Models |
author_facet |
Willem P. Sijp Matthew H. England |
author_sort |
Willem P. Sijp |
title |
The Control of Polar Haloclines by Along-Isopycnal Diffusion in Climate Models |
title_short |
The Control of Polar Haloclines by Along-Isopycnal Diffusion in Climate Models |
title_full |
The Control of Polar Haloclines by Along-Isopycnal Diffusion in Climate Models |
title_fullStr |
The Control of Polar Haloclines by Along-Isopycnal Diffusion in Climate Models |
title_full_unstemmed |
The Control of Polar Haloclines by Along-Isopycnal Diffusion in Climate Models |
title_sort |
control of polar haloclines by along-isopycnal diffusion in climate models |
publishDate |
2008 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.492.7896 http://web.maths.unsw.edu.au/~wsijp/papers/sijp_iso2.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
NADW North Atlantic Deep Water North Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic |
op_source |
http://web.maths.unsw.edu.au/~wsijp/papers/sijp_iso2.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.492.7896 http://web.maths.unsw.edu.au/~wsijp/papers/sijp_iso2.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766071085829193728 |