Bestimmung von Verweilzeiten und Transportraten in der Warmwassersphaere des Suedatlantiks aus Tracerdaten
Tritium and CFC-11 data obtained from the programmes WOCE (1990-1995) and SAVE (1987-1989, CFC-11 data only) are used for an analysis of the upper level circulation in the South Atlantic Ocean (density range sigma-0 = 26.0-27.1 kg/m**3). A new bomb tritium input function for the South Atlantic is pr...
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Universität Bremen
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/1753 2023-05-15T17:36:38+02:00 Bestimmung von Verweilzeiten und Transportraten in der Warmwassersphaere des Suedatlantiks aus Tracerdaten Turnover times and transport rates in the warm water sphere of the South Atlantic derived from tracer data Butzin, Martin Roether, Wolfgang Schlitzer, Reiner 1999-07-02 application/pdf https://media.suub.uni-bremen.de/handle/elib/1753 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000000340 ger ger Universität Bremen FB1 Physik/Elektrotechnik https://media.suub.uni-bremen.de/handle/elib/1753 urn:nbn:de:gbv:46-diss000000340 info:eu-repo/semantics/openAccess oceanography South Atlantic water masses Central Water age dating subduction transport tracer tritium isotopes CFC´s hydrologic cycle 530 530 Physics ddc:530 Dissertation doctoralThesis 1999 ftsubbremen 2022-11-09T07:09:40Z Tritium and CFC-11 data obtained from the programmes WOCE (1990-1995) and SAVE (1987-1989, CFC-11 data only) are used for an analysis of the upper level circulation in the South Atlantic Ocean (density range sigma-0 = 26.0-27.1 kg/m**3). A new bomb tritium input function for the South Atlantic is presented. The atmospheric deposition is based on previous work by Doney et al. [1992]. The new input function also accounts for tritium deposition due to river runoff and for tritium exchange with other ocean basins. The calculated total tritium input for 1960-1995 between 0°S-50°S and the observed tritium inventory in 1995 agree well (within 1%). This agreement supports a value of 0.70 for the liquid/vapor isotopic fractionation factor of tritium, disproving GCM model calculations by Koster et al. [1989] that yielded a fractionation factor of 0.35. Tritium surface water concentrations are inferred from a simple mixed layer model driven by atmospheric tritium fluxes and calibrated using GEOSECS and WOCE data. The surface water concentrations of the South Atlantic are lower than in the North Atlantic. The highest surface values in the 1990´s are found in the subtropics where the surface water concentrations are still slowly increasing. As boundary condition for CFC-11 it is assumed that the sea surface is in a solubility equilibrium with the atmosphere. For quasi synoptic analyses the tritium and CFC-11 data are projected to the year 1993 using a 1D advection-diffusion model. Meridional sections show tracer concentrations decreasing with depth. Maximum penetration of tritium and CFC-11 is found in the subtropical region. North of about 20°S there is a concentration decline in both tracers indicating upwelling processes. Distributions on isopycnal surfaces show high tritium values in the western South Atlantic which may be due to the formation of Subtropical and Subantarctic Mode Waters. Doctoral or Postdoctoral Thesis North Atlantic South Atlantic Ocean Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
German |
topic |
oceanography South Atlantic water masses Central Water age dating subduction transport tracer tritium isotopes CFC´s hydrologic cycle 530 530 Physics ddc:530 |
spellingShingle |
oceanography South Atlantic water masses Central Water age dating subduction transport tracer tritium isotopes CFC´s hydrologic cycle 530 530 Physics ddc:530 Butzin, Martin Bestimmung von Verweilzeiten und Transportraten in der Warmwassersphaere des Suedatlantiks aus Tracerdaten |
topic_facet |
oceanography South Atlantic water masses Central Water age dating subduction transport tracer tritium isotopes CFC´s hydrologic cycle 530 530 Physics ddc:530 |
description |
Tritium and CFC-11 data obtained from the programmes WOCE (1990-1995) and SAVE (1987-1989, CFC-11 data only) are used for an analysis of the upper level circulation in the South Atlantic Ocean (density range sigma-0 = 26.0-27.1 kg/m**3). A new bomb tritium input function for the South Atlantic is presented. The atmospheric deposition is based on previous work by Doney et al. [1992]. The new input function also accounts for tritium deposition due to river runoff and for tritium exchange with other ocean basins. The calculated total tritium input for 1960-1995 between 0°S-50°S and the observed tritium inventory in 1995 agree well (within 1%). This agreement supports a value of 0.70 for the liquid/vapor isotopic fractionation factor of tritium, disproving GCM model calculations by Koster et al. [1989] that yielded a fractionation factor of 0.35. Tritium surface water concentrations are inferred from a simple mixed layer model driven by atmospheric tritium fluxes and calibrated using GEOSECS and WOCE data. The surface water concentrations of the South Atlantic are lower than in the North Atlantic. The highest surface values in the 1990´s are found in the subtropics where the surface water concentrations are still slowly increasing. As boundary condition for CFC-11 it is assumed that the sea surface is in a solubility equilibrium with the atmosphere. For quasi synoptic analyses the tritium and CFC-11 data are projected to the year 1993 using a 1D advection-diffusion model. Meridional sections show tracer concentrations decreasing with depth. Maximum penetration of tritium and CFC-11 is found in the subtropical region. North of about 20°S there is a concentration decline in both tracers indicating upwelling processes. Distributions on isopycnal surfaces show high tritium values in the western South Atlantic which may be due to the formation of Subtropical and Subantarctic Mode Waters. |
author2 |
Roether, Wolfgang Schlitzer, Reiner |
format |
Doctoral or Postdoctoral Thesis |
author |
Butzin, Martin |
author_facet |
Butzin, Martin |
author_sort |
Butzin, Martin |
title |
Bestimmung von Verweilzeiten und Transportraten in der Warmwassersphaere des Suedatlantiks aus Tracerdaten |
title_short |
Bestimmung von Verweilzeiten und Transportraten in der Warmwassersphaere des Suedatlantiks aus Tracerdaten |
title_full |
Bestimmung von Verweilzeiten und Transportraten in der Warmwassersphaere des Suedatlantiks aus Tracerdaten |
title_fullStr |
Bestimmung von Verweilzeiten und Transportraten in der Warmwassersphaere des Suedatlantiks aus Tracerdaten |
title_full_unstemmed |
Bestimmung von Verweilzeiten und Transportraten in der Warmwassersphaere des Suedatlantiks aus Tracerdaten |
title_sort |
bestimmung von verweilzeiten und transportraten in der warmwassersphaere des suedatlantiks aus tracerdaten |
publisher |
Universität Bremen |
publishDate |
1999 |
url |
https://media.suub.uni-bremen.de/handle/elib/1753 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000000340 |
genre |
North Atlantic South Atlantic Ocean |
genre_facet |
North Atlantic South Atlantic Ocean |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/1753 urn:nbn:de:gbv:46-diss000000340 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766136183152181248 |