The hydrographic conditions at depth below 1000 m water depth in the region of the Romanche Fracture Zones
During the "Atlantic Expedition" in1965 (IQSY) a comprehensive bathymetric survey and a few hydrographic stations were made by R.V. „Meteor“ in the equatorial region of the Mid-Atlantic Ridge. The survey results are shown in a bythymetric chart covering the western parts of the Romanche- a...
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1970
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.603892 https://doi.org/10.1594/PANGAEA.603892 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.603892 2023-05-15T13:42:09+02:00 The hydrographic conditions at depth below 1000 m water depth in the region of the Romanche Fracture Zones Tomczak, Gerhard Annutsch, Ralph MEDIAN LATITUDE: -0.271970 * MEDIAN LONGITUDE: -14.687879 * SOUTH-BOUND LATITUDE: -6.383333 * WEST-BOUND LONGITUDE: -25.066667 * NORTH-BOUND LATITUDE: 5.000000 * EAST-BOUND LONGITUDE: 25.133333 * DATE/TIME START: 1965-03-30T20:00:00 * DATE/TIME END: 1967-03-05T00:00:00 1970-03-09 application/zip, 22 datasets https://doi.pangaea.de/10.1594/PANGAEA.603892 https://doi.org/10.1594/PANGAEA.603892 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.603892 https://doi.org/10.1594/PANGAEA.603892 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Tomczak, Gerhard; Annutsch, Ralph (1970): Die Topographie und die hydrographischen Verhältnisse unterhalb 2000 m Tiefe im Gebiet der Romanche-Bruchzone. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe A Allgemeines, Physik und Chemie des Meeres, Gebrüder Bornträger, Berlin, Stuttgart, A7, 111-130 CH17-302 CH17-315 CH17-316 CH17-317 CH17-341 CH17-5 CH17-6 Chain CRAW_1963 CRAW_1963_1246 CRAW_1963_1358 Crawford Equatorial Atlantic EX_1963 EX_1963_25 EX_1963_29 EX_1963_31 EX_1963_34 EX_1963_37 EX_1963_41 EX_1963_44 EX_1963_47 EX_1963_50 Explorer IQSY - Jahre der ruhigen Sonne Atlantische Expedition 1965 M2 M2_015WS M2_016WS M2_017WS M2_020WS M2_023WS M2_123WS Meteor (1964) Water sample WS Dataset 1970 ftpangaea https://doi.org/10.1594/PANGAEA.603892 2023-01-20T07:31:03Z During the "Atlantic Expedition" in1965 (IQSY) a comprehensive bathymetric survey and a few hydrographic stations were made by R.V. „Meteor“ in the equatorial region of the Mid-Atlantic Ridge. The survey results are shown in a bythymetric chart covering the western parts of the Romanche- and Chain Fracture Zones. West of the original Romanche Trench another deep trench with a medium depth of 6000 m was discovered. The maximum sounding obtained was 7028 m. Both trenches apparently belong to the same fracture zone, but are distinctly separated from each other. The estern boundary of the trench against the Brasil Basin is formed by a sill rising to a depth of about 4400 m. The serial hydrographic observations give some indications of the flow of the cold Westatlantic deep water in the fracture zone area and its influence on the hydrographic conditions in the East-Atlantic Basin. The upper limit of the nearly homogenious Westatlantic bottom water with an Antarctic components lies about 4400 m. The water mass entering the system of trenches of the Romanche Fracture Zone over the western sill originates from the lower part of the discontinuity layer lying above the bottom water. Potential temperatures of 0.6°C were the lowest observed by "Meteor" in the western trench. There seems to be a remarkable tongue of relatively high salinity and a minimum of oxygen in the deep water of this trench. At present we can only speculate upon the origin of this highly saline deep water tongue underneath the eastward moving relatively thin layer of less saline Westatlantic deep water. In the range of the sill separating both trenches a lee wave is indicated by the distribution of salinity and oxygen, which implies a vertical transport of water masses. Caused by this transport it is assumed that relatively cold water may be lifted temporarily to a depth, where it can pass the northbounding ridge, thus getting directly into the Sierra Leone Basin. In the original Romanche Trench the cold Westatlantic deep water seems to fill the whole ... Dataset Antarc* Antarctic PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Crawford ENVELOPE(-86.467,-86.467,-77.717,-77.717) Mid-Atlantic Ridge ENVELOPE(-25.066667,25.133333,5.000000,-6.383333) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
CH17-302 CH17-315 CH17-316 CH17-317 CH17-341 CH17-5 CH17-6 Chain CRAW_1963 CRAW_1963_1246 CRAW_1963_1358 Crawford Equatorial Atlantic EX_1963 EX_1963_25 EX_1963_29 EX_1963_31 EX_1963_34 EX_1963_37 EX_1963_41 EX_1963_44 EX_1963_47 EX_1963_50 Explorer IQSY - Jahre der ruhigen Sonne Atlantische Expedition 1965 M2 M2_015WS M2_016WS M2_017WS M2_020WS M2_023WS M2_123WS Meteor (1964) Water sample WS |
spellingShingle |
CH17-302 CH17-315 CH17-316 CH17-317 CH17-341 CH17-5 CH17-6 Chain CRAW_1963 CRAW_1963_1246 CRAW_1963_1358 Crawford Equatorial Atlantic EX_1963 EX_1963_25 EX_1963_29 EX_1963_31 EX_1963_34 EX_1963_37 EX_1963_41 EX_1963_44 EX_1963_47 EX_1963_50 Explorer IQSY - Jahre der ruhigen Sonne Atlantische Expedition 1965 M2 M2_015WS M2_016WS M2_017WS M2_020WS M2_023WS M2_123WS Meteor (1964) Water sample WS Tomczak, Gerhard Annutsch, Ralph The hydrographic conditions at depth below 1000 m water depth in the region of the Romanche Fracture Zones |
topic_facet |
CH17-302 CH17-315 CH17-316 CH17-317 CH17-341 CH17-5 CH17-6 Chain CRAW_1963 CRAW_1963_1246 CRAW_1963_1358 Crawford Equatorial Atlantic EX_1963 EX_1963_25 EX_1963_29 EX_1963_31 EX_1963_34 EX_1963_37 EX_1963_41 EX_1963_44 EX_1963_47 EX_1963_50 Explorer IQSY - Jahre der ruhigen Sonne Atlantische Expedition 1965 M2 M2_015WS M2_016WS M2_017WS M2_020WS M2_023WS M2_123WS Meteor (1964) Water sample WS |
description |
During the "Atlantic Expedition" in1965 (IQSY) a comprehensive bathymetric survey and a few hydrographic stations were made by R.V. „Meteor“ in the equatorial region of the Mid-Atlantic Ridge. The survey results are shown in a bythymetric chart covering the western parts of the Romanche- and Chain Fracture Zones. West of the original Romanche Trench another deep trench with a medium depth of 6000 m was discovered. The maximum sounding obtained was 7028 m. Both trenches apparently belong to the same fracture zone, but are distinctly separated from each other. The estern boundary of the trench against the Brasil Basin is formed by a sill rising to a depth of about 4400 m. The serial hydrographic observations give some indications of the flow of the cold Westatlantic deep water in the fracture zone area and its influence on the hydrographic conditions in the East-Atlantic Basin. The upper limit of the nearly homogenious Westatlantic bottom water with an Antarctic components lies about 4400 m. The water mass entering the system of trenches of the Romanche Fracture Zone over the western sill originates from the lower part of the discontinuity layer lying above the bottom water. Potential temperatures of 0.6°C were the lowest observed by "Meteor" in the western trench. There seems to be a remarkable tongue of relatively high salinity and a minimum of oxygen in the deep water of this trench. At present we can only speculate upon the origin of this highly saline deep water tongue underneath the eastward moving relatively thin layer of less saline Westatlantic deep water. In the range of the sill separating both trenches a lee wave is indicated by the distribution of salinity and oxygen, which implies a vertical transport of water masses. Caused by this transport it is assumed that relatively cold water may be lifted temporarily to a depth, where it can pass the northbounding ridge, thus getting directly into the Sierra Leone Basin. In the original Romanche Trench the cold Westatlantic deep water seems to fill the whole ... |
format |
Dataset |
author |
Tomczak, Gerhard Annutsch, Ralph |
author_facet |
Tomczak, Gerhard Annutsch, Ralph |
author_sort |
Tomczak, Gerhard |
title |
The hydrographic conditions at depth below 1000 m water depth in the region of the Romanche Fracture Zones |
title_short |
The hydrographic conditions at depth below 1000 m water depth in the region of the Romanche Fracture Zones |
title_full |
The hydrographic conditions at depth below 1000 m water depth in the region of the Romanche Fracture Zones |
title_fullStr |
The hydrographic conditions at depth below 1000 m water depth in the region of the Romanche Fracture Zones |
title_full_unstemmed |
The hydrographic conditions at depth below 1000 m water depth in the region of the Romanche Fracture Zones |
title_sort |
hydrographic conditions at depth below 1000 m water depth in the region of the romanche fracture zones |
publisher |
PANGAEA |
publishDate |
1970 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.603892 https://doi.org/10.1594/PANGAEA.603892 |
op_coverage |
MEDIAN LATITUDE: -0.271970 * MEDIAN LONGITUDE: -14.687879 * SOUTH-BOUND LATITUDE: -6.383333 * WEST-BOUND LONGITUDE: -25.066667 * NORTH-BOUND LATITUDE: 5.000000 * EAST-BOUND LONGITUDE: 25.133333 * DATE/TIME START: 1965-03-30T20:00:00 * DATE/TIME END: 1967-03-05T00:00:00 |
long_lat |
ENVELOPE(-86.467,-86.467,-77.717,-77.717) ENVELOPE(-25.066667,25.133333,5.000000,-6.383333) |
geographic |
Antarctic Crawford Mid-Atlantic Ridge |
geographic_facet |
Antarctic Crawford Mid-Atlantic Ridge |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Supplement to: Tomczak, Gerhard; Annutsch, Ralph (1970): Die Topographie und die hydrographischen Verhältnisse unterhalb 2000 m Tiefe im Gebiet der Romanche-Bruchzone. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe A Allgemeines, Physik und Chemie des Meeres, Gebrüder Bornträger, Berlin, Stuttgart, A7, 111-130 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.603892 https://doi.org/10.1594/PANGAEA.603892 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.603892 |
_version_ |
1766163226279542784 |