Carbon Isotopes in the Ocean Model of the Community Earth System Model (CESM1)

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Author(s) Jahn, A., Lindsay, K., Giraud, X., Gruber, N., Otto-Bliesner, B.L., Liu, Z., Brady, E.C.
Publication Type Journal Items, Publication Status: Published
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Title Carbon Isotopes in the Ocean Model of the Community Earth System Model (CESM1)
Author(s) Jahn, A.
Lindsay, K.
Giraud, X.
Gruber, N.
Otto-Bliesner, B.L.
Liu, Z.
Brady, E.C.
Journal or Series Title Geoscientific model development discussions
Volume Number 7
Issue Number 6
Start Page 7461
End Page 7503
ISSN 1991-9611
Publisher Copernicus
Publication Place Göttingen
Publication Date 2014-11
Abstract Carbon isotopes in the ocean are frequently used as paleo climate proxies and as present-day geochemical ocean tracers. In order to allow a more direct comparison of climate model results with this large and currently underutilized dataset, we added a carbon isotope module to the ocean model of the Community Earth System Model (CESM), containing the cycling of the stable isotope 13C and the radioactive isotope 14C. We implemented the 14C tracer in two ways: in the "abiotic" case, the 14C tracer is only subject to air–sea gas exchange, physical transport, and radioactive decay, while in the "biotic" version, the 14C additionally follows the 13C tracer through all biogeochemical and ecological processes. Thus, the abiotic 14C tracer can be run without the ecosystem module, requiring significantly less computational resources. The carbon isotope module calculates the carbon isotopic fractionation during gas exchange, photosynthesis, and calcium carbonate formation, while any subsequent biological process such as remineralization as well as any external inputs are assumed to occur without fractionation. Given the uncertainty associated with the biological fractionation during photosynthesis, we implemented and tested three parameterizations of different complexity. Compared to present-day observations, the model is able to simulate the oceanic 14C bomb uptake and the 13C Suess effect reasonably well compared to observations and other model studies. At the same time, the carbon isotopes reveal biases in the physical model, for example a too sluggish ventilation of the deep Pacific Ocean.
DOI 10.5194/gmdd- 7-7461-2014
Additional Notes Received 20 September 2014, Accepted 20 October 2014, Published 6 November 2014
Document Type Journal Item
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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NEBIS System Number 010180235
Source Database ID FORM-1421335031
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  author = "Jahn, A. and Lindsay, K. and Giraud, X. and Gruber, N. and Otto-Bliesner, B.L. and Liu, Z. and Brady, E.C.",
  title = "{C}arbon {I}sotopes in the {O}cean {M}odel of the {C}ommunity {E}arth {S}ystem {M}odel ({C}{E}{S}{M}1)",
  journal = "Geoscientific model development discussions",
  year = 2014,
  volume = "7",
  number = "6",
  pages = "7461--7503",
  month = nov,

E-Citations record created: Thu, 15 Jan 2015, 15:17:13 CET