DOI: 10.1002/2017GB005648
Scopus记录号: 2-s2.0-85021451665
论文题名: Understanding the unique biogeochemistry of the Mediterranean Sea: Insights from a coupled phosphorus and nitrogen model
作者: Powley H ; R ; , Krom M ; D ; , Van Cappellen P
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 6 起始页码: 1010
结束页码: 1031
语种: 英语
英文关键词: Mediterranean Sea
; N:P ratios
; nitrogen
; nutrients
; phosphours
; primary production
Scopus关键词: biogeochemistry
; deep water
; denitrification
; dissolved inorganic nitrogen
; dissolved inorganic phosphorus
; nitrogen
; nutrient dynamics
; oligotrophic environment
; phosphorus
; primary production
; surface water
; Italy
; Mediterranean Sea
; Sicily
; Strait of Gibraltar
英文摘要: The Mediterranean Sea (MS) is an oligotrophic basin whose offshore water column exhibits low dissolved inorganic phosphorus (P) and nitrogen (N) concentrations, unusually high nitrate (NO3) to phosphate (PO4) ratios, and distinct biogeochemical differences between the Western Mediterranean Sea (WMS) and Eastern Mediterranean Sea (EMS). A new mass balance model of P and N cycling in the WMS is coupled to a pre-existing EMS model to understand these biogeochemical features. Estimated land-derived inputs of reactive P and N to the WMS and EMS are similar per unit surface area, but marine inputs are 4 to 5 times greater for the WMS, which helps explain the approximately 3 times higher primary productivity of the WMS. The lateral inputs of marine sourced inorganic and organic P support significant fractions of new production in the WMS and EMS, similar to subtropical gyres. The mass balance calculations imply that the MS is net heterotrophic: dissolved organic P and N entering the WMS and EMS, primarily via the Straits of Gibraltar and Sicily, are mineralized to PO4 and NO3 and subsequently exported out of the basin by the prevailing anti-estuarine circulation. The high deepwater (DW) molar NO3:PO4 ratios reflect the high reactive N:P ratio of inputs to the WMS and EMS, combined with low denitrification rates. The lower DW NO3:PO4 ratio of the WMS (21) compared to the EMS (28) reflects lower reactive N:P ratios of inputs to the WMS, including the relatively low N:P ratio of Atlantic surface water flowing into the WMS. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77730
Appears in Collections: 气候变化事实与影响
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作者单位: Ecohydrology Research Group, Water Institute and Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, Canada; School of Earth and Environment, University of Leeds, Leeds, United Kingdom; Department of Marine Biology, Charney School of Marine Sciences, University of Haifa, Haifa, Israel
Recommended Citation:
Powley H,R,, Krom M,et al. Understanding the unique biogeochemistry of the Mediterranean Sea: Insights from a coupled phosphorus and nitrogen model[J]. Global Biogeochemical Cycles,2017-01-01,31(6)