| DOI: | 10.1002/2015GB005354
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| Scopus记录号: | 2-s2.0-84981301481
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| 论文题名: | Oxygen utilization rate (OUR) underestimates ocean respiration: A model study |
| 作者: | Koeve W; , Kähler P
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| 刊名: | Global Biogeochemical Cycles
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| ISSN: | 8866236
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| 出版年: | 2016
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| 卷: | 30, 期:8 | | 起始页码: | 1166
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| 结束页码: | 1182
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| 语种: | 英语
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| 英文关键词: | consumption
; global modeling
; OUR
; oxygen
; respiration
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| Scopus关键词: | biogeochemical cycle
; gas transport
; global ocean
; gyre
; isopycnal layer
; numerical model
; nutrient loss
; oceanic circulation
; oligotrophic environment
; oxygen
; oxygen consumption
; respiration
|
| 英文摘要: | We use a simple 1-D model representing an isolated density surface in the ocean and 3-D global ocean biogeochemical models to evaluate the concept of computing the subsurface oceanic oxygen utilization rate (OUR) from the changes of apparent oxygen utilization (AOU) and water age. The distribution of AOU in the ocean is not only the imprint of respiration in the ocean's interior but is strongly influenced by transport processes and eventually loss at the ocean surface. Since AOU and water age are subject to advection and diffusive mixing, it is only when they are affected both in the same way that OUR represents the correct rate of oxygen consumption. This is the case only when advection prevails or with uniform respiration rates, when the proportions of AOU and age are not changed by transport. In experiments with the 1-D tube model, OUR underestimates respiration when maximum respiration rates occur near the outcrops of isopycnals and overestimates when maxima occur far from the outcrops. Given the distribution of respiration in the ocean, i.e., elevated rates near high-latitude outcrops of isopycnals and low rates below the oligotrophic gyres, underestimates are the rule. Integrating these effects globally in three coupled ocean biogeochemical and circulation models, we find that AOU-over-age based calculations underestimate true model respiration by a factor of 3. Most of this difference is observed in the upper 1000 m of the ocean with the discrepancies increasing toward the surface where OUR underestimates respiration by as much as factor of 4. ©2016. American Geophysical Union. All Rights Reserved. |
| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/77830
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Biogeochemical Modelling, GEOMAR Helmholtz-Zentrum für Ozeanforschung, Kiel, Germany; Chemical Oceanography, GEOMAR Helmholtz-Zentrum für Ozeanforschung, Kiel, Germany
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| Recommended Citation: | |
Koeve W,, Kähler P. Oxygen utilization rate (OUR) underestimates ocean respiration: A model study[J]. Global Biogeochemical Cycles,2016-01-01,30(8)
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