q 1998 American Meteorological Society Mesoscale Variability in Denmark Strait: The PV Outflow Hypothesis*
The outflow through Denmark Strait shows remarkable mesoscale variability characterized by the continuous formation of intense mesoscale cyclones just south of the sill. These cyclones have a diameter of about 30 km and clear signatures at the sea surface and in currents measured near the bottom. Th...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.541.6618 2023-05-15T15:08:09+02:00 q 1998 American Meteorological Society Mesoscale Variability in Denmark Strait: The PV Outflow Hypothesis* Michael A. Spall James F. Price The Pennsylvania State University CiteSeerX Archives 1997 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.541.6618 http://www.whoi.edu/science/PO/people/mspall/pdfs/spall_denmark_jpo1998.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.541.6618 http://www.whoi.edu/science/PO/people/mspall/pdfs/spall_denmark_jpo1998.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.whoi.edu/science/PO/people/mspall/pdfs/spall_denmark_jpo1998.pdf text 1997 ftciteseerx 2016-01-08T11:05:42Z The outflow through Denmark Strait shows remarkable mesoscale variability characterized by the continuous formation of intense mesoscale cyclones just south of the sill. These cyclones have a diameter of about 30 km and clear signatures at the sea surface and in currents measured near the bottom. They have a remnant of Arctic Intermediate Water (AIW) in their core. The authors ’ hypothesis is that these cyclones are formed by stretching of the high potential vorticity (PV) water column that outflows through Denmark Strait. The light, upper layer of the outflow, the East Greenland Current, remains on the surface in the Irminger Sea, while the dense overflow water descends the east Greenland continental slope. The midlevel waters, mostly AIW, could thus be stretched by more than 100%, which would induce very strong cyclonic relative vorticity. The main test of this new hypothesis is by way of numerical experiments carried out with an isopycnal coordinate ocean model configured to have a marginal sea connected to a deep ocean basin by a shallow strait. An outflow is produced by imposing buoyancy forcing over the marginal sea. If the buoyancy forcing is such as to produce a single overflow layer (analogous to the overflows through the Strait of Gibraltar and the Faroe Bank Channel), then the resulting overflow is slightly time dependent. If the buoyancy forcing is such as to Text Arctic Denmark Strait East Greenland east greenland current Greenland Unknown Arctic Faroe Bank ENVELOPE(-8.667,-8.667,60.917,60.917) Greenland Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) |
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ftciteseerx |
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English |
description |
The outflow through Denmark Strait shows remarkable mesoscale variability characterized by the continuous formation of intense mesoscale cyclones just south of the sill. These cyclones have a diameter of about 30 km and clear signatures at the sea surface and in currents measured near the bottom. They have a remnant of Arctic Intermediate Water (AIW) in their core. The authors ’ hypothesis is that these cyclones are formed by stretching of the high potential vorticity (PV) water column that outflows through Denmark Strait. The light, upper layer of the outflow, the East Greenland Current, remains on the surface in the Irminger Sea, while the dense overflow water descends the east Greenland continental slope. The midlevel waters, mostly AIW, could thus be stretched by more than 100%, which would induce very strong cyclonic relative vorticity. The main test of this new hypothesis is by way of numerical experiments carried out with an isopycnal coordinate ocean model configured to have a marginal sea connected to a deep ocean basin by a shallow strait. An outflow is produced by imposing buoyancy forcing over the marginal sea. If the buoyancy forcing is such as to produce a single overflow layer (analogous to the overflows through the Strait of Gibraltar and the Faroe Bank Channel), then the resulting overflow is slightly time dependent. If the buoyancy forcing is such as to |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Michael A. Spall James F. Price |
spellingShingle |
Michael A. Spall James F. Price q 1998 American Meteorological Society Mesoscale Variability in Denmark Strait: The PV Outflow Hypothesis* |
author_facet |
Michael A. Spall James F. Price |
author_sort |
Michael A. Spall |
title |
q 1998 American Meteorological Society Mesoscale Variability in Denmark Strait: The PV Outflow Hypothesis* |
title_short |
q 1998 American Meteorological Society Mesoscale Variability in Denmark Strait: The PV Outflow Hypothesis* |
title_full |
q 1998 American Meteorological Society Mesoscale Variability in Denmark Strait: The PV Outflow Hypothesis* |
title_fullStr |
q 1998 American Meteorological Society Mesoscale Variability in Denmark Strait: The PV Outflow Hypothesis* |
title_full_unstemmed |
q 1998 American Meteorological Society Mesoscale Variability in Denmark Strait: The PV Outflow Hypothesis* |
title_sort |
q 1998 american meteorological society mesoscale variability in denmark strait: the pv outflow hypothesis* |
publishDate |
1997 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.541.6618 http://www.whoi.edu/science/PO/people/mspall/pdfs/spall_denmark_jpo1998.pdf |
long_lat |
ENVELOPE(-8.667,-8.667,60.917,60.917) ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Arctic Faroe Bank Greenland Irminger Sea |
geographic_facet |
Arctic Faroe Bank Greenland Irminger Sea |
genre |
Arctic Denmark Strait East Greenland east greenland current Greenland |
genre_facet |
Arctic Denmark Strait East Greenland east greenland current Greenland |
op_source |
http://www.whoi.edu/science/PO/people/mspall/pdfs/spall_denmark_jpo1998.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.541.6618 http://www.whoi.edu/science/PO/people/mspall/pdfs/spall_denmark_jpo1998.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766339563198873600 |