globalchange  > 气候变化事实与影响
DOI: 10.1002/2014GB004904
Scopus记录号: 2-s2.0-84927627065
论文题名:
Preferential remineralization of dissolved organic phosphorus and non-Redfield DOM dynamics in the global ocean: Impacts on marine productivity, nitrogen fixation, and carbon export
作者: Letscher R; T; , Moore J; K
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期:3
起始页码: 325
结束页码: 340
语种: 英语
英文关键词: carbon export ; marine DOM ; marine N2-fixation ; non-Redfield ; preferential remineralization
Scopus关键词: carbon ; carbon cycle ; data set ; dissolved organic phosphorus ; global ocean ; nitrogen ; nitrogen fixation ; numerical model ; nutrient cycling ; phosphorus ; primary production ; remineralization ; Redfieldia
英文摘要: Selective removal of nitrogen (N) and phosphorus (P) from the marine dissolved organic matter (DOM) pool has been reported in several regional studies. Because DOM is an important advective/mixing pathway of carbon (C) export from the ocean surface layer and its non-Redfieldian stoichiometry would affect estimates of marine export production per unit N and P, we investigated the stoichiometry of marine DOM and its remineralization globally using a compiled DOM data set. Marine DOM is enriched in C and N compared to Redfield stoichiometry, averaging 317:39:1 and 810:48:1 for C:N:P within the degradable and total bulk pools, respectively. Dissolved organic phosphorus (DOP) is found to be preferentially remineralized about twice as rapidly with respect to the enriched C:N stoichiometry of marine DOM. Biogeochemical simulations with the Biogeochemical Elemental Cycling model using Redfield and variable DOM stoichiometry corroborate the need for non-Redfield dynamics to match the observed DOM stoichiometry. From our model simulations, preferential DOP remineralization is found to increase the strength of the biological pump by ∼9% versus the case of Redfield DOM cycling. Global net primary productivity increases ∼10% including an increase in marine nitrogen fixation of ∼26% when preferential DOP remineralization and direct utilization of DOP by phytoplankton are included. The largest increases in marine nitrogen fixation, net primary productivity, and carbon export are observed within the western subtropical gyres, suggesting the lateral transfer of P in the form of DOP from the productive eastern and poleward gyre margins may be important for sustaining these processes downstream in the subtropical gyres. ©2015. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77990
Appears in Collections:气候变化事实与影响

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作者单位: Earth System Science, University of California, Irvine, CA, United States

Recommended Citation:
Letscher R,T,, Moore J,et al. Preferential remineralization of dissolved organic phosphorus and non-Redfield DOM dynamics in the global ocean: Impacts on marine productivity, nitrogen fixation, and carbon export[J]. Global Biogeochemical Cycles,2015-01-01,29(3)
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