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  Stable carbon isotope distribution of particulate organic matter in the ocean: A model study

Hofmann, M., Wolf-Gladrow, D., Takahashi, T., Sutherland, S., Six, K., & Maier-Reimer, E. (2000). Stable carbon isotope distribution of particulate organic matter in the ocean: A model study. Marine Chemistry, 72, 131-150. doi:10.1016/S0304-4203(00)00078-5.

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m-r_e_2000_stable_carbon_isotope_distribution_of_particulate_organic_matter_in_the_ocean.pdf (Publisher version), 968KB
 
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 Creators:
Hofmann, M.1, Author
Wolf-Gladrow, D.A.1, Author
Takahashi, T.1, Author
Sutherland, S.C.1, Author
Six, K.D.1, Author
Maier-Reimer, Ernst2, Author           
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1External Organizations, ou_persistent22              
2MPI for Meteorology, Max Planck Society, ou_913545              

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Free keywords: carbon cycle; carbon isotope; global ocean; particulate organic matter; spatial distribution; stable isotope
 Abstract: The stable carbon isotopic composition of particulate organic matter in the ocean, δ13C(POC), shows characteristic spatial variations with high values in low latitudes and low values in high latitudes. The lowest δ13C(POC) values (-32‰ to -35‰) have been reported in the Southern Ocean, whereas in arctic and subarctic regions δ13C(POC) values do not drop below -27‰. This interhemispheric asymmetry is still unexplained. Global gradients in δ13C(POC) are much greater than in δ13C(DIC), suggesting that variations in isotopic fractionation during organic matter production are primarily responsible for the observed range in δ13C(POC). Understanding the factors that control isotope variability is a prerequisite when applying δ13C(POC) to the study of marine carbon biogeochemistry. The present model study attempts to reproduce the δ13C(POC) distribution pattern in the ocean. The three-dimensional (3D) Hamburg Model of the Oceanic Carbon Cycle version 3.1 (HAMOCC3.1) was combined with two different parametrizations of the biological fractionation of stable carbon isotopes. In the first parametrization, it is assumed that the isotopic fractionation between CO2 in seawater and the organic material produced by algae, ε(p), is a function of the ambient CO2 concentration. The two parameters of this function are derived from observations and are not based on an assumption of any specific mechanism. Thus, this parametrization is purely empirical. The second parametrization is based on fractionation models for microalgae. It is supported by several laboratory experiments. Here the fractionation, ε(p), depends on the CO2 concentration in seawater and on the (instantaneous) growth rates, μ(i), of the phytoplankton. In the Atlantic Ocean, where most field data are available, both parametrizations reproduce the latitudinal variability of the mean δ13C(POC) distribution. The interhemispheric asymmetry of δ13C(POC) can mostly be attributed to the interhemispheric asymmetry of CO2 concentration in the water. However, the strong seasonal variations of δ13C(POC) as reported by several authors, can only be explained by a growth rate-dependent fractionation, which reflects variations in the cellular carbon demand. (C) 2000 Elsevier Science B.V.

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Language(s): eng - English
 Dates: 2000
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/S0304-4203(00)00078-5
BibTex Citekey: Hofmann2000131
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Title: Marine Chemistry
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 72 Sequence Number: - Start / End Page: 131 - 150 Identifier: ISSN: 0304-4203
CoNE: https://pure.mpg.de/cone/journals/resource/954925512459