Long-Period Transport Changes in the Eastern North Atlantic and Their Simulation by Propagating Waves
An analysis is presented of geostrophic volume transport across a zonal line along 28-degrees-N in the eastern Atlantic. The data are from an array of five moorings with 200-km spacing carrying temperature sensors and one current meter each for 1 or 2 years. Transport changes in the main thermocline...
Published in: | Journal of Geophysical Research: Oceans |
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Language: | English |
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AGU (American Geophysical Union)
1993
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Online Access: | https://oceanrep.geomar.de/id/eprint/15382/ https://oceanrep.geomar.de/id/eprint/15382/1/92JC02122.pdf https://doi.org/10.1029/92JC02122 |
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ftoceanrep:oai:oceanrep.geomar.de:15382 2023-05-15T17:34:10+02:00 Long-Period Transport Changes in the Eastern North Atlantic and Their Simulation by Propagating Waves Siedler, Gerold Finke, Michael 1993 text https://oceanrep.geomar.de/id/eprint/15382/ https://oceanrep.geomar.de/id/eprint/15382/1/92JC02122.pdf https://doi.org/10.1029/92JC02122 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/15382/1/92JC02122.pdf Siedler, G. and Finke, M. (1993) Long-Period Transport Changes in the Eastern North Atlantic and Their Simulation by Propagating Waves. Open Access Journal of Geophysical Research: Oceans, 98 (C2). pp. 2393-2406. DOI 10.1029/92JC02122 <https://doi.org/10.1029/92JC02122>. doi:10.1029/92JC02122 info:eu-repo/semantics/openAccess Article PeerReviewed 1993 ftoceanrep https://doi.org/10.1029/92JC02122 2023-04-07T15:05:23Z An analysis is presented of geostrophic volume transport across a zonal line along 28-degrees-N in the eastern Atlantic. The data are from an array of five moorings with 200-km spacing carrying temperature sensors and one current meter each for 1 or 2 years. Transport changes in the main thermocline relative to a fixed depth level are obtained by the use of temperature-salinity relationships. The transport variability is simulated by two propagating waves with first-order baroclinic mode structure. Solutions exist with annual and semi-annual periods and zonal wavelengths of 100-200 km and 300 km, respectively. Assuming quasi-geostrophic dynamics and using results on the Reynolds stress, the dominating waves of annual and semi-annual period are found to propagate to the southwest, with 45-degrees-60-degrees and 25-degrees to the south off the westward direction, respectively. Wave solutions with a 90-day period and a zonal wavelength of about 300 km are interpreted as an effect of barotropic waves arising due to horizontal temperature inhomogeneity. The propagation is about +/-25-degrees off the westward direction. In general, good approximations are obtained with the propagating wave simulations in the western and central part of the array, while large differences occur between observation and simulation close to the Canary archipelago. Possible causes for these differences are discussed. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Journal of Geophysical Research: Oceans 98 C2 2393 2406 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
An analysis is presented of geostrophic volume transport across a zonal line along 28-degrees-N in the eastern Atlantic. The data are from an array of five moorings with 200-km spacing carrying temperature sensors and one current meter each for 1 or 2 years. Transport changes in the main thermocline relative to a fixed depth level are obtained by the use of temperature-salinity relationships. The transport variability is simulated by two propagating waves with first-order baroclinic mode structure. Solutions exist with annual and semi-annual periods and zonal wavelengths of 100-200 km and 300 km, respectively. Assuming quasi-geostrophic dynamics and using results on the Reynolds stress, the dominating waves of annual and semi-annual period are found to propagate to the southwest, with 45-degrees-60-degrees and 25-degrees to the south off the westward direction, respectively. Wave solutions with a 90-day period and a zonal wavelength of about 300 km are interpreted as an effect of barotropic waves arising due to horizontal temperature inhomogeneity. The propagation is about +/-25-degrees off the westward direction. In general, good approximations are obtained with the propagating wave simulations in the western and central part of the array, while large differences occur between observation and simulation close to the Canary archipelago. Possible causes for these differences are discussed. |
format |
Article in Journal/Newspaper |
author |
Siedler, Gerold Finke, Michael |
spellingShingle |
Siedler, Gerold Finke, Michael Long-Period Transport Changes in the Eastern North Atlantic and Their Simulation by Propagating Waves |
author_facet |
Siedler, Gerold Finke, Michael |
author_sort |
Siedler, Gerold |
title |
Long-Period Transport Changes in the Eastern North Atlantic and Their Simulation by Propagating Waves |
title_short |
Long-Period Transport Changes in the Eastern North Atlantic and Their Simulation by Propagating Waves |
title_full |
Long-Period Transport Changes in the Eastern North Atlantic and Their Simulation by Propagating Waves |
title_fullStr |
Long-Period Transport Changes in the Eastern North Atlantic and Their Simulation by Propagating Waves |
title_full_unstemmed |
Long-Period Transport Changes in the Eastern North Atlantic and Their Simulation by Propagating Waves |
title_sort |
long-period transport changes in the eastern north atlantic and their simulation by propagating waves |
publisher |
AGU (American Geophysical Union) |
publishDate |
1993 |
url |
https://oceanrep.geomar.de/id/eprint/15382/ https://oceanrep.geomar.de/id/eprint/15382/1/92JC02122.pdf https://doi.org/10.1029/92JC02122 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/15382/1/92JC02122.pdf Siedler, G. and Finke, M. (1993) Long-Period Transport Changes in the Eastern North Atlantic and Their Simulation by Propagating Waves. Open Access Journal of Geophysical Research: Oceans, 98 (C2). pp. 2393-2406. DOI 10.1029/92JC02122 <https://doi.org/10.1029/92JC02122>. doi:10.1029/92JC02122 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/92JC02122 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
98 |
container_issue |
C2 |
container_start_page |
2393 |
op_container_end_page |
2406 |
_version_ |
1766132920959893504 |