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Tomczak, Gerhard; Annutsch, Ralph (1970): The hydrographic conditions at depth below 1000 m water depth in the region of the Romanche Fracture Zones [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.603892, Supplement to: Tomczak, G; Annutsch, R (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

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Abstract:
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 trough, but its extension remains limited to the trench itself. The water masses found east of the sill separating the trench from the East-Atlantic Basin originate from the lower part of the discontinuity layer. With potential temperatures of about 1.3°C they are much warmer than those observed in the Romanche Trench bottom water.
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
Event(s):
CH17-302 * Latitude: 1.500000 * Longitude: -10.666667 * Date/Time: 1965-03-30T20:00:00 * Elevation: -5204.0 m * Location: Equatorial Atlantic * Campaign: CH17-5 * Basis: Chain * Method/Device: Water sample (WS)
CH17-315 * Latitude: 0.283333 * Longitude: -14.433333 * Date/Time: 1965-04-06T02:00:00 * Elevation: -4237.0 m * Location: Equatorial Atlantic * Campaign: CH17-5 * Basis: Chain * Method/Device: Water sample (WS)
CH17-316 * Latitude: 0.516667 * Longitude: -15.466667 * Date/Time: 1965-04-06T10:00:00 * Elevation: -4796.0 m * Location: Equatorial Atlantic * Campaign: CH17-5 * Basis: Chain * Method/Device: Water sample (WS)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
22 datasets

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Datasets listed in this publication series

  1. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site CH17-302, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587060
  2. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site CH17-315, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587061
  3. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site CH17-316, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587062
  4. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site CH17-317, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587063
  5. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site CH17-341, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587064
  6. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site CRAW_1963_1246, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587065
  7. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site CRAW_1963_1358, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587066
  8. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site EX_1963_25, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587067
  9. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site EX_1963_29, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587068
  10. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site EX_1963_31, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587069
  11. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site EX_1963_34, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587070
  12. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site EX_1963_37, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587071
  13. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site EX_1963_41, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587072
  14. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site EX_1963_44, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587073
  15. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site EX_1963_47, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587074
  16. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site EX_1963_50, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587075
  17. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site M2_015WS, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587076
  18. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site M2_016WS, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587077
  19. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site M2_017WS, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587078
  20. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site M2_020WS, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587079
  21. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site M2_023WS, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587080
  22. Tomczak, G; Annutsch, R (1970): Hydrographic observation below 1000 m water depth at site M2_123WS, equatorial Atlantic. https://doi.org/10.1594/PANGAEA.587081