An investigation of cold overflow over the Iceland/Faeroes Ridge
Hydrographic data were analyzed to determine spatial and temporal variability of the overflow of cold, fresh Arctic water over the Iceland/Faeroes Ridge into the Iceland Basin during both winter and summer. Regions of frequent intermittent overflow were located together with areas that remain relati...
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Monterey, California: Naval Postgraduate School
1990
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ftnavalpschool:oai:calhoun.nps.edu:10945/27693 2024-06-09T07:44:24+00:00 An investigation of cold overflow over the Iceland/Faeroes Ridge Tunnicliffe, Peter A. Bourke, Robert H. Chiu, Ching-Sang Naval Postgraduate School (U.S.) Oceanography 1990-12 x, 96 p. application/pdf https://hdl.handle.net/10945/27693 en_US eng Monterey, California: Naval Postgraduate School https://hdl.handle.net/10945/27693 Copyright is reserved by the copyright owner Iceland/Faeroes Ridge Overflow Parabolic Equation Model Oceanography Temperature Thesis 1990 ftnavalpschool 2024-05-15T01:00:01Z Hydrographic data were analyzed to determine spatial and temporal variability of the overflow of cold, fresh Arctic water over the Iceland/Faeroes Ridge into the Iceland Basin during both winter and summer. Regions of frequent intermittent overflow were located together with areas that remain relatively unaffected by this process. A time series of near bottom temperatures revealed a possible link between significant overflow events and local wind fields which may result in a seasonal contrast in conditions. Two overflow mechanisms were identified: an intermittent plume-like flow promoted by local wind forcing; and a continuous thin veil of mixed overflow water formed from more significantly sized eddiesfilaments located on top of the ridge. Estimates were made as to the probable contribution of both mechanisms to the total transport of Norwegian Sea water into the North Atlantic Ocean. Dynamic models of overflow were reviewed and, based on hydrographic results, a probable mechanism for overflow was proposed. Sound speed profiles were constructed representing the presence absence of overflow events and predicted sonar ranges were computed using a range-dependent parabolic equation model. Major effects on acoustic propagation are shown to be confined to regions close to the top of the rise, even during overflow events; however, large reduction in sonar ranges are predicted for areas on top of the ridge, even at low frequencies (100 Hz). Analysis of observations in the area suggest that acoustic variability in the region can be related to small changes in sea surface temperature and consequently may lead to a prediction of acoustic conditions in the region using AVHRR imagery. Approved for public release; distribution is unlimited. Lieutenant Commander, Royal Navy http://archive.org/details/aninvestigationo1094527693 Thesis Arctic Iceland North Atlantic Norwegian Sea Naval Postgraduate School: Calhoun Arctic Norwegian Sea |
institution |
Open Polar |
collection |
Naval Postgraduate School: Calhoun |
op_collection_id |
ftnavalpschool |
language |
English |
topic |
Iceland/Faeroes Ridge Overflow Parabolic Equation Model Oceanography Temperature |
spellingShingle |
Iceland/Faeroes Ridge Overflow Parabolic Equation Model Oceanography Temperature Tunnicliffe, Peter A. An investigation of cold overflow over the Iceland/Faeroes Ridge |
topic_facet |
Iceland/Faeroes Ridge Overflow Parabolic Equation Model Oceanography Temperature |
description |
Hydrographic data were analyzed to determine spatial and temporal variability of the overflow of cold, fresh Arctic water over the Iceland/Faeroes Ridge into the Iceland Basin during both winter and summer. Regions of frequent intermittent overflow were located together with areas that remain relatively unaffected by this process. A time series of near bottom temperatures revealed a possible link between significant overflow events and local wind fields which may result in a seasonal contrast in conditions. Two overflow mechanisms were identified: an intermittent plume-like flow promoted by local wind forcing; and a continuous thin veil of mixed overflow water formed from more significantly sized eddiesfilaments located on top of the ridge. Estimates were made as to the probable contribution of both mechanisms to the total transport of Norwegian Sea water into the North Atlantic Ocean. Dynamic models of overflow were reviewed and, based on hydrographic results, a probable mechanism for overflow was proposed. Sound speed profiles were constructed representing the presence absence of overflow events and predicted sonar ranges were computed using a range-dependent parabolic equation model. Major effects on acoustic propagation are shown to be confined to regions close to the top of the rise, even during overflow events; however, large reduction in sonar ranges are predicted for areas on top of the ridge, even at low frequencies (100 Hz). Analysis of observations in the area suggest that acoustic variability in the region can be related to small changes in sea surface temperature and consequently may lead to a prediction of acoustic conditions in the region using AVHRR imagery. Approved for public release; distribution is unlimited. Lieutenant Commander, Royal Navy http://archive.org/details/aninvestigationo1094527693 |
author2 |
Bourke, Robert H. Chiu, Ching-Sang Naval Postgraduate School (U.S.) Oceanography |
format |
Thesis |
author |
Tunnicliffe, Peter A. |
author_facet |
Tunnicliffe, Peter A. |
author_sort |
Tunnicliffe, Peter A. |
title |
An investigation of cold overflow over the Iceland/Faeroes Ridge |
title_short |
An investigation of cold overflow over the Iceland/Faeroes Ridge |
title_full |
An investigation of cold overflow over the Iceland/Faeroes Ridge |
title_fullStr |
An investigation of cold overflow over the Iceland/Faeroes Ridge |
title_full_unstemmed |
An investigation of cold overflow over the Iceland/Faeroes Ridge |
title_sort |
investigation of cold overflow over the iceland/faeroes ridge |
publisher |
Monterey, California: Naval Postgraduate School |
publishDate |
1990 |
url |
https://hdl.handle.net/10945/27693 |
geographic |
Arctic Norwegian Sea |
geographic_facet |
Arctic Norwegian Sea |
genre |
Arctic Iceland North Atlantic Norwegian Sea |
genre_facet |
Arctic Iceland North Atlantic Norwegian Sea |
op_relation |
https://hdl.handle.net/10945/27693 |
op_rights |
Copyright is reserved by the copyright owner |
_version_ |
1801373142512304128 |