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Numerical model experiments on the variation of the ocean-atmosphere carbon cycle during the last 2100 years: The impact of variations of the thermahaline oceanic circulation; Numerische Modellexperimente zur Veraenderung des Ozean-Atmosphaere-Kohlenstoffkreislaufes waehrend der letzten 21000 Jahre: Der Einfluss von Variationen der thermohalinen Ozeanzirkulation

Abstract

In order to quantify the variability of the ocean-atmosphere carbon-cycle on glacial-interglacial time scales numerical biogeochemical models are required. In this work, a modeling approach consisting of a coupling between a newly developed biogeochemical box model (16 oceanic boxes) and a three-dimensional (3D) ocean general circulation model (OGCM) was pursued. The simulation of biogeochemical processes by the box model is almost identical to state of the art 3D-models. The global OGCM (4 x 6 , 12 layers) is forced by temperature and salinity fields obtained from paleoceanographic time-slice reconstructions, and model-derived wind fields. This model setup offers several advantages: (1) The box model is driven by waterfluxes that are diagnosed from the OGCM-fields. This approach results in hydrodynamically consistent water-fluxes for the box model. (2) The OGCM results guide the selection of appropriate box-configurations for time-slices having water-mass distributions that differ from the present-day situation. (3) The high numerical efficiency of the biogeochemical model component allows for a sufficient number of sensitivity experiments. (4) Based on paleoceanographic information, the boundary conditions of the box model can be combined as a function of time in order to conduct time-dependent experiments with the box model. (orig.) [Deutsch] Die globale Quantifizierung von Veraenderungen  More>>
Authors:
Publication Date:
Mar 01, 1998
Product Type:
Technical Report
Report Number:
SFB-313-74
Reference Number:
SCA: 540320; 540120; PA: DE-98:0GC413; EDB-98:095728; SN: 98001995543
Resource Relation:
Other Information: PBD: 1 Mar 1998
Subject:
54 ENVIRONMENTAL SCIENCES; CARBON CYCLE; AIR-WATER INTERACTIONS; MATHEMATICAL MODELS; BIOSPHERE; SEAS; OCEANIC CIRCULATION; SENSITIVITY ANALYSIS; CARBON DIOXIDE; CARBON ISOTOPES
OSTI ID:
643197
Research Organizations:
Kiel Univ. (Germany). Sonderforschungsbereich 313 - Veraenderungen der Umwelt - Der Noerdliche Nordatlantik
Country of Origin:
Germany
Language:
German
Other Identifying Numbers:
Journal ID: ISSN 0942-119X; Other: ON: DE98773730; TRN: DE98GC413
Availability:
OSTI as DE98773730
Submitting Site:
DE
Size:
196 p.
Announcement Date:

Citation Formats

Schulz, M. Numerical model experiments on the variation of the ocean-atmosphere carbon cycle during the last 2100 years: The impact of variations of the thermahaline oceanic circulation; Numerische Modellexperimente zur Veraenderung des Ozean-Atmosphaere-Kohlenstoffkreislaufes waehrend der letzten 21000 Jahre: Der Einfluss von Variationen der thermohalinen Ozeanzirkulation. Germany: N. p., 1998. Web.
Schulz, M. Numerical model experiments on the variation of the ocean-atmosphere carbon cycle during the last 2100 years: The impact of variations of the thermahaline oceanic circulation; Numerische Modellexperimente zur Veraenderung des Ozean-Atmosphaere-Kohlenstoffkreislaufes waehrend der letzten 21000 Jahre: Der Einfluss von Variationen der thermohalinen Ozeanzirkulation. Germany.
Schulz, M. 1998. "Numerical model experiments on the variation of the ocean-atmosphere carbon cycle during the last 2100 years: The impact of variations of the thermahaline oceanic circulation; Numerische Modellexperimente zur Veraenderung des Ozean-Atmosphaere-Kohlenstoffkreislaufes waehrend der letzten 21000 Jahre: Der Einfluss von Variationen der thermohalinen Ozeanzirkulation." Germany.
@misc{etde_643197,
title = {Numerical model experiments on the variation of the ocean-atmosphere carbon cycle during the last 2100 years: The impact of variations of the thermahaline oceanic circulation; Numerische Modellexperimente zur Veraenderung des Ozean-Atmosphaere-Kohlenstoffkreislaufes waehrend der letzten 21000 Jahre: Der Einfluss von Variationen der thermohalinen Ozeanzirkulation}
author = {Schulz, M}
abstractNote = {In order to quantify the variability of the ocean-atmosphere carbon-cycle on glacial-interglacial time scales numerical biogeochemical models are required. In this work, a modeling approach consisting of a coupling between a newly developed biogeochemical box model (16 oceanic boxes) and a three-dimensional (3D) ocean general circulation model (OGCM) was pursued. The simulation of biogeochemical processes by the box model is almost identical to state of the art 3D-models. The global OGCM (4 x 6 , 12 layers) is forced by temperature and salinity fields obtained from paleoceanographic time-slice reconstructions, and model-derived wind fields. This model setup offers several advantages: (1) The box model is driven by waterfluxes that are diagnosed from the OGCM-fields. This approach results in hydrodynamically consistent water-fluxes for the box model. (2) The OGCM results guide the selection of appropriate box-configurations for time-slices having water-mass distributions that differ from the present-day situation. (3) The high numerical efficiency of the biogeochemical model component allows for a sufficient number of sensitivity experiments. (4) Based on paleoceanographic information, the boundary conditions of the box model can be combined as a function of time in order to conduct time-dependent experiments with the box model. (orig.) [Deutsch] Die globale Quantifizierung von Veraenderungen des Ozean-Atmosphaere-Kohlenstoffkreislaufes auf glazial-interglazialen Zeitskalen erfordert den Einsatz numerischer biogeochemischer Modelle. Im Rahmen dieser Arbeit wurde hierzu ein Modellansatz gewaehlt, der aus der Kopplung eines neu entwickelten biogeochemischen Boxmodells (16 ozeanische Boxen) an ein dreidimensionales (3D) allgemeines Ozean-Zirkulationsmodell (OGCM) besteht. Die Simulation biogeochemischer Prozesse erfolgt im Boxmodell analog zu hochentwickelten 3D-Modellen. Das globale (4 x 6 , 12 Schichten) Ozeanmodell wird mit Temperatur- und Salzgehaltsfeldern, die aus palaeozenographischen Zeitscheibenrekonstruktionen stammen, sowie modellierten Windschubspannungen angetrieben. Diese Modellkombination bietet mehrere Vorteile: (1) Das Boxmodell wird mit hydrodynamisch konsistenten Wassertransporten angetrieben, die aus den OGCM-Feldern diagnostiziert werden. (2) Fuer Palaeozeitscheiben lassen sich anhand der OGCM-Ergebnisse Boxkonfigurationen ermitteln, welche die jeweilige Wassermassenverteilung optimal repraesentieren. (3) Die biogeochemische Modellkomponente ist numerisch sehr effizient und erlaubt es, eine hinreichend grosse Anzahl von Sensivitaetsexperimenten durchzufuehren. (4) Durch die zeitliche Verknuepfung der Randbedingungen des Boxmodells auf der Grundlage von palaeozeanographischen Informationen lassen sich zeitabhaengige Modellexperimente mit dem Boxmodell durchfuehren. (orig.)}
place = {Germany}
year = {1998}
month = {Mar}
}