DOI: 10.1002/jgrd.50187
论文题名: Atmospheric P deposition to the subtropical North Atlantic: Sources, properties, and relationship to N deposition
作者: Zamora L.M. ; Prospero J.M. ; Hansell D.A. ; Trapp J.M.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 3 起始页码: 1546
结束页码: 1562
语种: 英语
英文关键词: aerosol
; deposition
; dust
; nitrogen
; organic
; phosphorus
Scopus关键词: Aerosols
; Biogeochemistry
; Deposition
; Deposition rates
; Dust
; Meteorological problems
; Nitrogen
; Oceanography
; Phosphorus
; River pollution
; Atmospheric depositions
; Atmospheric nitrogen
; Biogeochemical studies
; High deposition rates
; Inorganic nitrogen
; organic
; Organic phosphorus
; Soluble reactive phosphorus
; Air pollution
; atmospheric deposition
; phosphorus
; precipitation (climatology)
; subtropical region
; surface water
; wet deposition
; Atlantic Ocean
; Atlantic Ocean (North)
; Barbados
; Florida [United States]
; Miami
; United States
英文摘要: Biogeochemical studies show that the surface waters of the subtropical North Atlantic are highly phosphorus (P) stressed. Human activity may exacerbate phosphorus stress by enhancing atmospheric nitrogen (N) deposition and raising N/P ratios in deposition. However, the magnitude of this effect is unclear, in part, because atmospherically deposited phosphorus sources are not well known, particularly the contribution from organic phosphorus. Here we report measurements of phosphorus in aerosols and wet deposition at Miami and Barbados. African dust is the major aerosol P source at both Miami and Barbados, containing ∼880 ppm total phosphorus and ∼70 ppm soluble reactive phosphorus (SRP). Organic compounds contribute, on average, 28%-44% of soluble phosphorus in precipitation. Because of dust transport seasonality, phosphorus inputs to the North Atlantic are expected to be highly variable with 2-10 times more P deposition during summer than winter. Pollution is also an important contributor to total and soluble phosphorus in Miami aerosols and deposition. Estimated SRP deposition in Barbados and Miami is 0.21 and 0.13 μmol m -2 d-1 phosphorus, respectively. Inorganic nitrogen in excess of Redfield ratio expectations in deposition was very different between the sites, totaling 21-30 and 127-132 μmol m-2 d-1 nitrogen in Barbados and Miami, respectively; the high deposition rates at Miami are linked to pollutants. Including soluble organic nitrogen and phosphorus halved the estimates of excess nitrogen in Barbados wet deposition. Thus, the organic phosphorus fraction is important in the assessment of the magnitude of biogeochemical change of the North Atlantic caused by atmospheric deposition. Key PointsDust supplies most atmospheric P but pollution is an increasingly large sourceOrganic P supplies 28-44% of soluble P in rainWe estimate historical deposition rates and variability of P, excess Redfield N ©2013. American Geophysical Union. All Rights Reserved. 资助项目: AGS-0962256
; OCE-0623189
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63949
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Kiel, Germany; Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States; Coastal Carolina University, Conway, United States
Recommended Citation:
Zamora L.M.,Prospero J.M.,Hansell D.A.,et al. Atmospheric P deposition to the subtropical North Atlantic: Sources, properties, and relationship to N deposition[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(3)