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Geochemical cycles in an ocean general circulation model. Preindustrial tracer distributions
Author(s) -
MaierReimer Ernst
Publication year - 1993
Publication title -
global biogeochemical cycles
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.512
H-Index - 187
eISSN - 1944-9224
pISSN - 0886-6236
DOI - 10.1029/93gb01355
Subject(s) - carbon cycle , alkalinity , tracer , upwelling , geochemical cycle , ocean current , oceanography , geology , ocean general circulation model , sediment , carbon fibers , environmental science , general circulation model , chemistry , paleontology , climate change , ecology , physics , organic chemistry , ecosystem , nuclear physics , biology , materials science , composite number , composite material
A state‐of‐the‐art report is given of the Hamburg model of the oceanic carbon cycle. The model advects geochemical tracers important to the carbon cycle by the currents of a general circulation model. The geochemical cycling is driven by a Michaelis‐Menten type production kinetics. The model is an extension of the Bacastow and Maier‐Reimer (1990) model. It is based on a more realistic current field and includes a mechanism of lysocline‐sediment interaction. Principal variables are ∑CO 2 , alkalinity, phosphate, oxygen, and silicate. The carbon variables are defined for 12 C, 13 C, and 14 C separately. In addition to these carbon isotopes, 39 A and δ 18 O of dissolved oxygen are predicted. The model predicts realistic global patterns of tracer distribution. In the equatorial eastern Pacific, however, the structures are exaggerated due to a strong upwelling which is a common feature of coarse resolution models of the general circulation of the ocean.