DOI: 10.1002/2013GB004794
Scopus记录号: 2-s2.0-84904077642
论文题名: Western Pacific atmospheric nutrient deposition fluxes, their impact on surface ocean productivity
作者: Martino M ; , Hamilton D ; , Baker A ; R ; , Jickells T ; D ; , Bromley T ; , Nojiri Y ; , Quack B ; , Boyd P ; W
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 7 起始页码: 712
结束页码: 728
语种: 英语
英文关键词: aerosols
; biogeochemical cycles
; nutrient stoichiometry
; photosynthesis
; phytoplankton
Scopus关键词: Aerosols
; Atmospheric chemistry
; Deposition
; Meteorological problems
; Nitrogen fixation
; Phosphorus
; Photosynthesis
; Phytoplankton
; Stoichiometry
; Anthropogenic emissions
; Atmospheric depositions
; Atmospheric supply
; Biogeochemical cycle
; Northern Hemispheres
; Primary productivity
; Sampling campaigns
; Tropical Western Pacific
; Nutrients
; aerosol
; atmospheric deposition
; nitrogen fixation
; nutrient
; photosynthesis
; phytoplankton
; sampling
; stoichiometry
; Pacific Ocean
; Pacific Ocean (North)
; Pacific Ocean (Tropical)
; Pacific Ocean (West)
英文摘要: The atmospheric deposition of both macronutrients and micronutrients plays an important role in driving primary productivity, particularly in the low-latitude ocean. We report aerosol major ion measurements for five ship-based sampling campaigns in the western Pacific from ~25°N to 20°S and compare the results with those from Atlantic meridional transects (~50°N to 50°S) with aerosols collected and analyzed in the same laboratory, allowing full incomparability. We discuss sources of the main nutrient species (nitrogen (N), phosphorus (P), and iron (Fe)) in the aerosols and their stoichiometry. Striking north-south gradients are evident over both basins with the Northern Hemisphere more impacted by terrestrial dust sources and anthropogenic emissions and the North Atlantic apparently more impacted than the North Pacific. We estimate the atmospheric supply rates of these nutrients and the potential impact of the atmospheric deposition on the tropical western Pacific. Our results suggest that the atmospheric deposition is P deficient relative to the needs of the resident phytoplankton. These findings suggest that atmospheric supply of N, Fe, and P increases primary productivity utilizing some of the residual excess phosphorus (P) in the surface waters to compensate for aerosol P deficiency. Regional primary productivity is further enhanced via the stimulation of nitrogen fixation fuelled by the residual atmospheric iron and P. Our stoichiometric calculations reveal that a P* of 0.1-μmol-L -1 can offset the P deficiency in atmospheric supply for many months. This study suggests that atmospheric deposition may sustain ~10% of primary production in both the western tropical Pacific. Key Points Atmospheric N, P, and Fe deposition estimated for West Pacific Deposition is P deficient relative to Redfield and lower than Atlantic Deposition increases primary production by 10%, mainly by N2 fixation ©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/77485
Appears in Collections: 气候变化事实与影响
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作者单位: Centre for Ocean and Atmospheric Sciences, University of East Anglia, Norwich, United Kingdom; National Institute of Water and Atmosphere, Wellington, New Zealand; National Institute for Environmental Studies, Tsukuba, Japan; Helmholtz-Zentrum für Ozeanforschung Kiel (GEOMAR), Marine Biogeochemie/Chemische Ozeanographie, Kiel, Germany; NIWA Centre for Chemical and Physical Oceanography, Department of Chemistry, University of Otago, Dunedin, New Zealand; Institute for Marine and Antarctic Studies, University of Tasmania, Hobart TAS, Australia
Recommended Citation:
Martino M,, Hamilton D,, Baker A,et al. Western Pacific atmospheric nutrient deposition fluxes, their impact on surface ocean productivity[J]. Global Biogeochemical Cycles,2014-01-01,28(7)