The Jan Mayen Current and the deep waters of the Greenland Basin
During Sep 1989 the USNS BARTLETT occupied a dense array of 48 high- quality CTD stations in the Greenland Basin to characterize the Jan Mayen Current (JMC) system as part of the Greenland Current (EGC) waters in the form of a surface Polar Water (PW) tongue, a near-surface (approx 50m) core of modi...
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1990
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ftnavalpschool:oai:calhoun.nps.edu:10945/34874 2024-06-09T07:46:17+00:00 The Jan Mayen Current and the deep waters of the Greenland Basin Blythe, Robert F. Bourke, Robert H. Paquette, Robert G. Naval Postgraduate School (U.S.) Physical Oceanography and Meteorology 1990-09 xiii, 146 p. ill. application/pdf https://hdl.handle.net/10945/34874 en_US eng Monterey, California: Naval Postgraduate School https://hdl.handle.net/10945/34874 This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States. Water Thesis 1990 ftnavalpschool 2024-05-15T00:42:55Z During Sep 1989 the USNS BARTLETT occupied a dense array of 48 high- quality CTD stations in the Greenland Basin to characterize the Jan Mayen Current (JMC) system as part of the Greenland Current (EGC) waters in the form of a surface Polar Water (PW) tongue, a near-surface (approx 50m) core of modified PW, and an intermediate (approx 100m) core of Atlantic Water displaced approx 75 km northward of the PW core. In contrast, the Greenland Sea Gyre is very weakly stratified aside from a thin surface gradient. Historical data demonstrate the JMC axis to move approx 100 km north and south of its 1989 observed position near 74 deg and show that upper water column temperatures and salinities were significantly lower in 1989 and 1982 than in 1958. The dynamic height pattern (0-1000 dbar) supplemented with Lagrangian ice drift rates reveal the JMC as partly an anticyclonic meander in the EGC; drifters indicate a significant barotropic component. Baroclinic transport estimates yield a 2 Sv initial eastward transport by the JMC. This transport results in an annual freshwater excess of 1.4m over the survey area which equates to roughly 14 of the annually available fresh water in the EGC. Deep water analyses show that isopycnal mixing of Eurasian Basin Deep Water and Greenland Sea Deep Water to yield Norwegian Sea Deep Water occurs within the Greenland Basin. Historical data indicate no appreciable inter-annual fluctuation in deep water properties occurs between 1958 and 1989. Approved for public release; distribution is unlimited. Lieutenant, United States Navy http://archive.org/details/thejmayencurrent1094534874 Thesis Greenland Greenland Sea Jan Mayen Norwegian Sea Naval Postgraduate School: Calhoun Greenland Greenland Basin ENVELOPE(-5.000,-5.000,73.500,73.500) Jan Mayen Norwegian Sea |
institution |
Open Polar |
collection |
Naval Postgraduate School: Calhoun |
op_collection_id |
ftnavalpschool |
language |
English |
topic |
Water |
spellingShingle |
Water Blythe, Robert F. The Jan Mayen Current and the deep waters of the Greenland Basin |
topic_facet |
Water |
description |
During Sep 1989 the USNS BARTLETT occupied a dense array of 48 high- quality CTD stations in the Greenland Basin to characterize the Jan Mayen Current (JMC) system as part of the Greenland Current (EGC) waters in the form of a surface Polar Water (PW) tongue, a near-surface (approx 50m) core of modified PW, and an intermediate (approx 100m) core of Atlantic Water displaced approx 75 km northward of the PW core. In contrast, the Greenland Sea Gyre is very weakly stratified aside from a thin surface gradient. Historical data demonstrate the JMC axis to move approx 100 km north and south of its 1989 observed position near 74 deg and show that upper water column temperatures and salinities were significantly lower in 1989 and 1982 than in 1958. The dynamic height pattern (0-1000 dbar) supplemented with Lagrangian ice drift rates reveal the JMC as partly an anticyclonic meander in the EGC; drifters indicate a significant barotropic component. Baroclinic transport estimates yield a 2 Sv initial eastward transport by the JMC. This transport results in an annual freshwater excess of 1.4m over the survey area which equates to roughly 14 of the annually available fresh water in the EGC. Deep water analyses show that isopycnal mixing of Eurasian Basin Deep Water and Greenland Sea Deep Water to yield Norwegian Sea Deep Water occurs within the Greenland Basin. Historical data indicate no appreciable inter-annual fluctuation in deep water properties occurs between 1958 and 1989. Approved for public release; distribution is unlimited. Lieutenant, United States Navy http://archive.org/details/thejmayencurrent1094534874 |
author2 |
Bourke, Robert H. Paquette, Robert G. Naval Postgraduate School (U.S.) Physical Oceanography and Meteorology |
format |
Thesis |
author |
Blythe, Robert F. |
author_facet |
Blythe, Robert F. |
author_sort |
Blythe, Robert F. |
title |
The Jan Mayen Current and the deep waters of the Greenland Basin |
title_short |
The Jan Mayen Current and the deep waters of the Greenland Basin |
title_full |
The Jan Mayen Current and the deep waters of the Greenland Basin |
title_fullStr |
The Jan Mayen Current and the deep waters of the Greenland Basin |
title_full_unstemmed |
The Jan Mayen Current and the deep waters of the Greenland Basin |
title_sort |
jan mayen current and the deep waters of the greenland basin |
publisher |
Monterey, California: Naval Postgraduate School |
publishDate |
1990 |
url |
https://hdl.handle.net/10945/34874 |
long_lat |
ENVELOPE(-5.000,-5.000,73.500,73.500) |
geographic |
Greenland Greenland Basin Jan Mayen Norwegian Sea |
geographic_facet |
Greenland Greenland Basin Jan Mayen Norwegian Sea |
genre |
Greenland Greenland Sea Jan Mayen Norwegian Sea |
genre_facet |
Greenland Greenland Sea Jan Mayen Norwegian Sea |
op_relation |
https://hdl.handle.net/10945/34874 |
op_rights |
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States. |
_version_ |
1801376058615791616 |