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  4. Modellierung der globalen biogeochemischen Stoffverteilung im glazialen Ozean: Ein Modell-Datenvergleich
 
Zitierlink URN
https://nbn-resolving.de/urn:nbn:de:gbv:46-diss000006067

Modellierung der globalen biogeochemischen Stoffverteilung im glazialen Ozean: Ein Modell-Datenvergleich

Veröffentlichungsdatum
2003-06-03
Autoren
Matthies, Michael  
Betreuer
Herterich, Klaus  
Gutachter
Ittekkot, Venugopalan  
Zusammenfassung
:br:In this work, a numeric three-dimensional biogeochemical model of the global carbon-cycle (HAMOCC2) was coupled to an ocean general circulation model (LSG) to explore the :img:=delta.gif:/img::sup:13:/sup:C distribution in the glacial Atlantic. In addition to the model comparison of the present-day (pre-industrial) distribution of the components of the marine carbon system with observations (GEOSECS), three model experiments for the Last Glacial Maximum (LGM) were carried out. For the present-day ocean, adequate correlations between model and observations were obtained. However, deviations occurred in the isotopes pattern of :img:=delta1.gif:/img::sup:14:/sup:C and :img:=delta.gif:/img::sup:13:/sup:C, which are primary due to problems of modelling the North Atlantic Deep Water (NADW). On the other side, uncertainties in the observed :img:=delta.gif:/img::sup:13:/sup:C values should be also taken into account. The simulated glacial :img:=delta.gif:/img::sup:13:/sup:C pattern was compared with a new data set of benthic carbon isotopes of the Western and Eastern Atlantic from the Last Glacial Maximum (21,000 -- 23,500 calendar years before present). The model output fits the :img:=delta.gif:/img::sup:13:/sup:C distribution derived from sediment samples, when the glacial export of NADW to the Southern Ocean was reduced by 50 % and the inflow of glacial Antarctic Bottom Water (AABW) was held constant. Usually, the modeled :img:=delta.gif:/img::sup:13:/sup:C pattern matched the paleodata within a range of ±0.2 per mil. No additional increase of the nutrient inventory of the deep ocean was necessary to reproduce the paleodata. Hence it is concluded that a significant increase in biological pumping during glacials may not be necessary to explain the reconstructed :img:=delta.gif:/img::sup:13:/sup:C distribution in this region. The results are discussed with respect to other scenarios for the decrease of global atmospheric carbon dioxide.
Schlagwörter
LGM

; 

mariner Kohlenstoffkreislauf

; 

Kohlenstoffisotope

; 

Biologische Pumpe

; 

Karbonat-Pumpe

; 

Lysokline

; 

carbon isotope

; 

marine carbon cycle

; 

model
Institution
Universität Bremen  
Fachbereich
Fachbereich 05: Geowissenschaften (FB 05)  
Dokumenttyp
Dissertation
Zweitveröffentlichung
Nein
Sprache
Deutsch
Dateien
Lade...
Vorschaubild
Name

E-Diss606_matthies-diss.pdf

Size

17.14 MB

Format

Adobe PDF

Checksum

(MD5):824499176a49b34dc472945a85967b4e

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