Logo des Repositoriums
Zur Startseite
  • English
  • Deutsch
Anmelden
  1. Startseite
  2. SuUB
  3. Dissertationen
  4. Bestimmung von Verweilzeiten und Transportraten in der Warmwassersphaere des Suedatlantiks aus Tracerdaten
 
Zitierlink URN
https://nbn-resolving.de/urn:nbn:de:gbv:46-diss000000340

Bestimmung von Verweilzeiten und Transportraten in der Warmwassersphaere des Suedatlantiks aus Tracerdaten

Veröffentlichungsdatum
1999-07-02
Autoren
Butzin, Martin  
Betreuer
Roether, Wolfgang  
Gutachter
Schlitzer, Reiner  
Zusammenfassung
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.
Schlagwörter
oceanography

; 

South Atlantic

; 

water masses

; 

Central Water

; 

age

; 

dating

; 

subduction

; 

transport

; 

tracer

; 

tritium

; 

isotopes

; 

CFC´s

; 

hydrologic cycle
Institution
Universität Bremen  
Fachbereich
Fachbereich 01: Physik/Elektrotechnik (FB 01)  
Dokumenttyp
Dissertation
Zweitveröffentlichung
Nein
Sprache
Deutsch
Dateien
Lade...
Vorschaubild
Name

E-Diss34_Butzin_M1999.pdf

Size

3.32 MB

Format

Adobe PDF

Checksum

(MD5):1cec3d09525298249f5f6de72d1a5ccf

Built with DSpace-CRIS software - Extension maintained and optimized by 4Science

  • Datenschutzbestimmungen
  • Endnutzervereinbarung
  • Feedback schicken