DOI: 10.1002/2013GB004652
Scopus记录号: 2-s2.0-84894274815
论文题名: Do Trichodesmium spp. populations in the North Atlantic export most of the nitrogen they fix?
作者: McGillicuddy D ; J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 2 起始页码: 103
结束页码: 114
语种: 英语
英文关键词: eddies
; export
; modeling
; nitrogen fixation
; North Atlantic
; Trichodesmium
Scopus关键词: Biomass
; Models
; Nitrogen
; Nitrogen fixation
; Oceanography
; Anticyclonic eddies
; Biogeochemical models
; Direct observations
; eddies
; export
; North Atlantic
; Quantitative evaluation
; Trichodesmium
; Computer simulation
; anticyclone
; assessment method
; biogeochemical cycle
; biological uptake
; cyanobacterium
; facilitation
; inorganic nitrogen
; nitrogen fixation
; numerical model
; population structure
; Atlantic Ocean
; Atlantic Ocean (North)
; Trichodesmium
英文摘要: A new observational synthesis of diazotrophic biomass and nitrogen fixation provides the opportunity for systematic quantitative evaluation of these aspects in biogeochemical models. One such model of the Atlantic Ocean is scrutinized, and the simulated biomass is found to be an order of magnitude too low. Initial attempts to increase biomass levels through decreasing grazing and other loss terms caused an unrealistic buildup of nitrate in the upper ocean. Two key changes to the model structure facilitated a closer match to the observed biomass and nitrogen fixation rates: addition of a pathway for export of diazotrophically fixed organic material and uptake of inorganic nitrogen by the diazotroph population. These changes, along with a few other revisions to existing model parameterizations, facilitate more accurate simulation of basin-scale distributions of diazotrophic biomass, as well as mesoscale variations contained therein. The resulting solutions suggest that the Trichodesmium spp. populations of the North Atlantic export the vast majority of the nitrogen they fix, a finding that awaits assessment through direct observation. Key Points Trichodesmium populations simulated with an eddy resolving model Simulating observed biomass and nitrogen fixation requires enhanced export Model captures observed association of Trichodesmium with anticyclonic eddies ©2014. 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/77532
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole MA, United States
Recommended Citation:
McGillicuddy D,J. Do Trichodesmium spp. populations in the North Atlantic export most of the nitrogen they fix?[J]. Global Biogeochemical Cycles,2014-01-01,28(2)