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  Testing global ocean carbon cycle models using measurements of atmospheric O2 and CO2 concentration

Stephens, B. B., Keeling, R. F., Heimann, M., Six, K. D., Murnane, R., & Caldeira, K. (1998). Testing global ocean carbon cycle models using measurements of atmospheric O2 and CO2 concentration. Global Biogeochemical Cycles, 12(2), 213-230.

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アイテムのパーマリンク: http://hdl.handle.net/11858/00-001M-0000-000E-E154-8 版のパーマリンク: http://hdl.handle.net/11858/00-001M-0000-0024-6BA2-E
資料種別: 学術論文

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BEX241.pdf (出版社版), 2MB
 
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BEX241.pdf
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 作成者:
Stephens, B. B., 著者
Keeling, R. F., 著者
Heimann, M.1, 著者              
Six, K. D., 著者
Murnane, R., 著者
Caldeira, K., 著者
所属:
1External Organizations, ou_persistent22              

内容説明

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キーワード: General-circulation model North-atlantic Thermohaline circulation Simulations Transport Distributions Dioxide Oxygen Heat Radiocarbon Earth sciences
 要旨: We present a method for testing the performance of global ocean carbon cycle models using measurements of atmospheric O-2 and CO2 concentration. We combine these measurements to define a tracer, atmospheric potential oxygen (APO approximate to O-2 + CO2), which is conservative with respect to terrestrial photosynthesis and respiration. We then compare observations of APO to the simulations of an atmospheric transport model which uses ocean-model air-sea fluxes and fossil fuel combustion estimates as lower boundary conditions. We present observations of the annual-average concentrations of CO2, O-2, and APO at 10 stations in a north-south transect. The observations of APO show a significant interhemispheric gradient decreasing towards the north. We use air-sea CO2, O-2, and N-2 fluxes from the Princeton ocean biogeochemistry model, the Hamburg model of the ocean carbon cycle, and the Lawrence Livermore ocean biogeochemistry model to drive the TM2 atmospheric transport model. The latitudinal variations in annual-average APO predicted by the combined models are distinctly different from the observations. All three models significantly underestimate the interhemispheric difference in APO, suggesting that they underestimate the net southward transport of the sum of O-2 and CO2 in the oceans. Uncertainties in the model-observation comparisons include uncertainties associated with the atmospheric measurements, the atmospheric transport model, and the physical and biological components of the ocean models. Potential deficiencies in the physical components of the ocean models, which have previously been suggested as causes for anomalously large heat fluxes out of the Southern Ocean, may contribute to the discrepancies with the APO observations. These deficiencies include the inadequate parameterization of subgrid-scale isopycnal eddy mixing, a lack of subgrid-scale vertical convection, too much Antarctic sea-ice formation, and an overestimation of vertical diffusivities in the main thermocline. [References: 55]

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 日付: 1998
 出版の状態: 紙媒体で出版済み
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 目次: -
 査読: -
 識別子(DOI, ISBNなど): その他: BEX241
 学位: -

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出版物 1

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出版物名: Global Biogeochemical Cycles
種別: 学術雑誌
 著者・編者:
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出版社, 出版地: Washington, DC : American Geophysical Union
ページ: - 巻号: 12 (2) 通巻号: - 開始・終了ページ: 213 - 230 識別子(ISBN, ISSN, DOIなど): CoNE: /journals/resource/954925553383
ISSN: 0886-6236