Interpretation von FCKW-Datensätzen im Weddellmeer

The aim of this thesis is to generate a circulation scheme of the deep water masses of the Weddell Sea with the primary objective to estimate production rates of different sources of these water masses using chlorofluorocarbon (CFC) data. Repeated observations of CFC for a section along the Prime Me...

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Bibliographic Details
Main Author: Klatt, Olaf
Other Authors: Roether, Wolfgang, Bleck-Neuhaus, Jörn
Format: Doctoral or Postdoctoral Thesis
Language:German
Published: Universität Bremen 2002
Subjects:
CFC
31
Online Access:https://media.suub.uni-bremen.de/handle/elib/1830
https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000002957
id ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/1830
record_format openpolar
spelling ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/1830 2023-05-15T13:22:06+02:00 Interpretation von FCKW-Datensätzen im Weddellmeer Interpretation of CFC-Datasets in Wedell Sea Klatt, Olaf Roether, Wolfgang Bleck-Neuhaus, Jörn 2002-04-24 application/pdf https://media.suub.uni-bremen.de/handle/elib/1830 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000002957 ger ger Universität Bremen FB1 Physik/Elektrotechnik https://media.suub.uni-bremen.de/handle/elib/1830 urn:nbn:de:gbv:46-diss000002957 info:eu-repo/semantics/openAccess regionale Ozeanographie Antarktis FCKW CFC Wassermassen thermohaline Zirkulation AABW 31 ddc:31 Dissertation doctoralThesis 2002 ftsubbremen 2022-11-09T07:09:41Z The aim of this thesis is to generate a circulation scheme of the deep water masses of the Weddell Sea with the primary objective to estimate production rates of different sources of these water masses using chlorofluorocarbon (CFC) data. Repeated observations of CFC for a section along the Prime Meridian from Antarctica (70°S) to approximately 50°S are presented for the period 1984 - 1998. In addition CFC data from the Weddell Sea section (Kapp Norvegia - Joinville Island) are considered. For various CFC features at this sections CFC time series have been generated, in particular for two deep cores of CFC-11 maxima adjoining the southern and northern margins of the Weddell Basin and elevated CFC concentrations over the Middle Atlantic Ridge. A new method of analyzing such CFC data has been developed. The outcome of this approach is the best fit of the age distribution, i.e. the fraction and the age of recently ventilated water. In contrast to previous methods more information about the age structure and a better error estimation could be derived. The convolution of the CFC and the velocity field results in the CFC transport through the section in this cores. The ratio of this value and the CFC surface concentration at the time of the water mass formation is an estimation of the transport of recently ventilated water within the core. Applying this to the deep cores at both sections a circulation scheme of the deep recently ventilated water could be estimated. From this scheme the production rates of the source in the western Weddell Sea and east of it (off Amery Ice Shelf) have been derived. Furthermore, the transport of the ventilated water of the mid-depth core has given an estimation of the productivity of the northern Weddell Sea. The comparison of these three sources has shown a surprising result: The production rates of all sources are in the same range (2.1±0.8 Sv western Weddell Sea; 2.4±0.8 Sv Amery Ice Shelf, about 3 Sv northern Weddell Sea). Doctoral or Postdoctoral Thesis Amery Ice Shelf Antarc* Antarctica Antarktis* Ice Shelf Joinville Island Weddell Sea Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Joinville ENVELOPE(-55.867,-55.867,-63.250,-63.250) Joinville Island ENVELOPE(-55.667,-55.667,-63.350,-63.350) Weddell Weddell Basin ENVELOPE(32.019,32.019,-55.568,-55.568) Weddell Sea
institution Open Polar
collection Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen)
op_collection_id ftsubbremen
language German
topic regionale Ozeanographie
Antarktis
FCKW
CFC
Wassermassen
thermohaline Zirkulation
AABW
31
ddc:31
spellingShingle regionale Ozeanographie
Antarktis
FCKW
CFC
Wassermassen
thermohaline Zirkulation
AABW
31
ddc:31
Klatt, Olaf
Interpretation von FCKW-Datensätzen im Weddellmeer
topic_facet regionale Ozeanographie
Antarktis
FCKW
CFC
Wassermassen
thermohaline Zirkulation
AABW
31
ddc:31
description The aim of this thesis is to generate a circulation scheme of the deep water masses of the Weddell Sea with the primary objective to estimate production rates of different sources of these water masses using chlorofluorocarbon (CFC) data. Repeated observations of CFC for a section along the Prime Meridian from Antarctica (70°S) to approximately 50°S are presented for the period 1984 - 1998. In addition CFC data from the Weddell Sea section (Kapp Norvegia - Joinville Island) are considered. For various CFC features at this sections CFC time series have been generated, in particular for two deep cores of CFC-11 maxima adjoining the southern and northern margins of the Weddell Basin and elevated CFC concentrations over the Middle Atlantic Ridge. A new method of analyzing such CFC data has been developed. The outcome of this approach is the best fit of the age distribution, i.e. the fraction and the age of recently ventilated water. In contrast to previous methods more information about the age structure and a better error estimation could be derived. The convolution of the CFC and the velocity field results in the CFC transport through the section in this cores. The ratio of this value and the CFC surface concentration at the time of the water mass formation is an estimation of the transport of recently ventilated water within the core. Applying this to the deep cores at both sections a circulation scheme of the deep recently ventilated water could be estimated. From this scheme the production rates of the source in the western Weddell Sea and east of it (off Amery Ice Shelf) have been derived. Furthermore, the transport of the ventilated water of the mid-depth core has given an estimation of the productivity of the northern Weddell Sea. The comparison of these three sources has shown a surprising result: The production rates of all sources are in the same range (2.1±0.8 Sv western Weddell Sea; 2.4±0.8 Sv Amery Ice Shelf, about 3 Sv northern Weddell Sea).
author2 Roether, Wolfgang
Bleck-Neuhaus, Jörn
format Doctoral or Postdoctoral Thesis
author Klatt, Olaf
author_facet Klatt, Olaf
author_sort Klatt, Olaf
title Interpretation von FCKW-Datensätzen im Weddellmeer
title_short Interpretation von FCKW-Datensätzen im Weddellmeer
title_full Interpretation von FCKW-Datensätzen im Weddellmeer
title_fullStr Interpretation von FCKW-Datensätzen im Weddellmeer
title_full_unstemmed Interpretation von FCKW-Datensätzen im Weddellmeer
title_sort interpretation von fckw-datensätzen im weddellmeer
publisher Universität Bremen
publishDate 2002
url https://media.suub.uni-bremen.de/handle/elib/1830
https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000002957
long_lat ENVELOPE(-94.063,-94.063,56.565,56.565)
ENVELOPE(71.000,71.000,-69.750,-69.750)
ENVELOPE(-55.867,-55.867,-63.250,-63.250)
ENVELOPE(-55.667,-55.667,-63.350,-63.350)
ENVELOPE(32.019,32.019,-55.568,-55.568)
geographic Amery
Amery Ice Shelf
Joinville
Joinville Island
Weddell
Weddell Basin
Weddell Sea
geographic_facet Amery
Amery Ice Shelf
Joinville
Joinville Island
Weddell
Weddell Basin
Weddell Sea
genre Amery Ice Shelf
Antarc*
Antarctica
Antarktis*
Ice Shelf
Joinville Island
Weddell Sea
genre_facet Amery Ice Shelf
Antarc*
Antarctica
Antarktis*
Ice Shelf
Joinville Island
Weddell Sea
op_relation https://media.suub.uni-bremen.de/handle/elib/1830
urn:nbn:de:gbv:46-diss000002957
op_rights info:eu-repo/semantics/openAccess
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