Oceanographical and meterological observations in the Westafrican area of upwelling during the 'Deutsche Nordatlantische Expedition' 1937
In 1937 the "Meteor" performed the cruises of the first part of the "Deutsche Nordatlantische Expedition". This publication treats seven stations of three-day-anchoring occupied during that time, five of which are located on the shelf, one on the continental slope and one on a ri...
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1970
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.603891 2023-05-15T17:37:02+02:00 Oceanographical and meterological observations in the Westafrican area of upwelling during the 'Deutsche Nordatlantische Expedition' 1937 Tomczak, Matthias MEDIAN LATITUDE: 19.662500 * MEDIAN LONGITUDE: -17.227417 * SOUTH-BOUND LATITUDE: 10.270000 * WEST-BOUND LONGITUDE: -23.253333 * NORTH-BOUND LATITUDE: 27.985000 * EAST-BOUND LONGITUDE: -13.253333 * DATE/TIME START: 1937-02-17T01:00:00 * DATE/TIME END: 1937-04-22T00:00:00 1970-03-09 application/zip, 20 datasets https://doi.pangaea.de/10.1594/PANGAEA.603891 https://doi.org/10.1594/PANGAEA.603891 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.603891 https://doi.org/10.1594/PANGAEA.603891 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Tomczak, Matthias (1970): Schwankungen von Schichtung und Strömung im westafrikanischen Auftriebsgebiet während der `Deutschen Nordatlantischen Expedition` 1937. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe A Allgemeines, Physik und Chemie des Meeres, Gebrüder Bornträger, Berlin, Stuttgart, A7, 1-109 Bottle Nansen M_1937_FRG Meteor (1924) Meteor311 Meteor327 Meteor334 Meteor336 Meteor341 Meteor366 Meteor369 NAS Nordatlantische Expedition 1937 North Atlantic Dataset 1970 ftpangaea https://doi.org/10.1594/PANGAEA.603891 2023-01-20T07:31:03Z In 1937 the "Meteor" performed the cruises of the first part of the "Deutsche Nordatlantische Expedition". This publication treats seven stations of three-day-anchoring occupied during that time, five of which are located on the shelf, one on the continental slope and one on a ridge between the Capverde islands. The Bohnecke current meter, an instrument developed for the expedition, is described briefly and it's accuracy studied by comparing the measurements of two instruments which operated simultaneously at the same depth. It is shown that it is very sensitive for movements of the anchored ship because of the very short measuring intervall (2 minutes). The influence of the ship's movements could not be eliminated completely, the mode of using the instrument at different depths being unsuitable for this. Considering the stratification the accuracy of it's representation by the mean temperature and salinity distributionis studied. It is shown that under certain conditions a distribution estimated from observed values gives more exact results. This especially applies to the TS-diagram. Station Meteor336, located on the shelf near Cape Juby, shows temperatures 4 °C less than the open ocean and so belongs to the area of upwelling. During the observation period, however, internal tides are prominent. The diurnal component is of considerable influence, the distinction from inertial oscillations (25.5 hours) not being possible, however. Station Meteor341, on the shelf off Spanish-Sahara, gives an excellent example of the movements in the centre of the area of upwelling. Changing it's direction by 45° at the beginning of the measurements, the wind causes a change of current direction at all depths which, after some inertial oscillations (period 28.3 hours), settles down to a final value. At the beginning and the end of the observations the current at the upper depths is directed off-shore, the angle between current and wind being 22°, while at the lower depths it is orientated towards the shore. The depth of the upper ... Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-23.253333,-13.253333,27.985000,10.270000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Bottle Nansen M_1937_FRG Meteor (1924) Meteor311 Meteor327 Meteor334 Meteor336 Meteor341 Meteor366 Meteor369 NAS Nordatlantische Expedition 1937 North Atlantic |
spellingShingle |
Bottle Nansen M_1937_FRG Meteor (1924) Meteor311 Meteor327 Meteor334 Meteor336 Meteor341 Meteor366 Meteor369 NAS Nordatlantische Expedition 1937 North Atlantic Tomczak, Matthias Oceanographical and meterological observations in the Westafrican area of upwelling during the 'Deutsche Nordatlantische Expedition' 1937 |
topic_facet |
Bottle Nansen M_1937_FRG Meteor (1924) Meteor311 Meteor327 Meteor334 Meteor336 Meteor341 Meteor366 Meteor369 NAS Nordatlantische Expedition 1937 North Atlantic |
description |
In 1937 the "Meteor" performed the cruises of the first part of the "Deutsche Nordatlantische Expedition". This publication treats seven stations of three-day-anchoring occupied during that time, five of which are located on the shelf, one on the continental slope and one on a ridge between the Capverde islands. The Bohnecke current meter, an instrument developed for the expedition, is described briefly and it's accuracy studied by comparing the measurements of two instruments which operated simultaneously at the same depth. It is shown that it is very sensitive for movements of the anchored ship because of the very short measuring intervall (2 minutes). The influence of the ship's movements could not be eliminated completely, the mode of using the instrument at different depths being unsuitable for this. Considering the stratification the accuracy of it's representation by the mean temperature and salinity distributionis studied. It is shown that under certain conditions a distribution estimated from observed values gives more exact results. This especially applies to the TS-diagram. Station Meteor336, located on the shelf near Cape Juby, shows temperatures 4 °C less than the open ocean and so belongs to the area of upwelling. During the observation period, however, internal tides are prominent. The diurnal component is of considerable influence, the distinction from inertial oscillations (25.5 hours) not being possible, however. Station Meteor341, on the shelf off Spanish-Sahara, gives an excellent example of the movements in the centre of the area of upwelling. Changing it's direction by 45° at the beginning of the measurements, the wind causes a change of current direction at all depths which, after some inertial oscillations (period 28.3 hours), settles down to a final value. At the beginning and the end of the observations the current at the upper depths is directed off-shore, the angle between current and wind being 22°, while at the lower depths it is orientated towards the shore. The depth of the upper ... |
format |
Dataset |
author |
Tomczak, Matthias |
author_facet |
Tomczak, Matthias |
author_sort |
Tomczak, Matthias |
title |
Oceanographical and meterological observations in the Westafrican area of upwelling during the 'Deutsche Nordatlantische Expedition' 1937 |
title_short |
Oceanographical and meterological observations in the Westafrican area of upwelling during the 'Deutsche Nordatlantische Expedition' 1937 |
title_full |
Oceanographical and meterological observations in the Westafrican area of upwelling during the 'Deutsche Nordatlantische Expedition' 1937 |
title_fullStr |
Oceanographical and meterological observations in the Westafrican area of upwelling during the 'Deutsche Nordatlantische Expedition' 1937 |
title_full_unstemmed |
Oceanographical and meterological observations in the Westafrican area of upwelling during the 'Deutsche Nordatlantische Expedition' 1937 |
title_sort |
oceanographical and meterological observations in the westafrican area of upwelling during the 'deutsche nordatlantische expedition' 1937 |
publisher |
PANGAEA |
publishDate |
1970 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.603891 https://doi.org/10.1594/PANGAEA.603891 |
op_coverage |
MEDIAN LATITUDE: 19.662500 * MEDIAN LONGITUDE: -17.227417 * SOUTH-BOUND LATITUDE: 10.270000 * WEST-BOUND LONGITUDE: -23.253333 * NORTH-BOUND LATITUDE: 27.985000 * EAST-BOUND LONGITUDE: -13.253333 * DATE/TIME START: 1937-02-17T01:00:00 * DATE/TIME END: 1937-04-22T00:00:00 |
long_lat |
ENVELOPE(-23.253333,-13.253333,27.985000,10.270000) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Tomczak, Matthias (1970): Schwankungen von Schichtung und Strömung im westafrikanischen Auftriebsgebiet während der `Deutschen Nordatlantischen Expedition` 1937. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe A Allgemeines, Physik und Chemie des Meeres, Gebrüder Bornträger, Berlin, Stuttgart, A7, 1-109 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.603891 https://doi.org/10.1594/PANGAEA.603891 |
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.603891 |
_version_ |
1766136743928528896 |