globalchange  > 气候变化与战略
DOI: 10.1029/2018GB005994
论文题名:
Flux of Particulate Elements in the North Atlantic Ocean Constrained by Multiple Radionuclides
作者: Hayes C.T.; Black E.E.; Anderson R.F.; Baskaran M.; Buesseler K.O.; Charette M.A.; Cheng H.; Cochran J.K.; Edwards R.L.; Fitzgerald P.; Lam P.J.; Lu Y.; Morris S.O.; Ohnemus D.C.; Pavia F.J.; Stewart G.; Tang Y.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期:12
语种: 英语
英文关键词: biogeochemical cycle ; biological pump ; carbon cycle ; carbon sink ; global ocean ; isotopic fractionation ; particle size ; particulate organic carbon ; radionuclide ; reaction kinetics ; sediment trap ; trace element ; Atlantic Ocean ; Atlantic Ocean (North)
学科: biological carbon pump ; export ; GEOTRACES ; North Atlantic ; trace metals
中文摘要: Sinking particles strongly regulate the distribution of reactive chemical substances in the ocean, including particulate organic carbon and other elements (e.g., P, Cd, Mn, Cu, Co, Fe, Al, and 232 Th). Yet, the sinking fluxes of trace elements have not been well described in the global ocean. The U.S. GEOTRACES campaign in the North Atlantic (GA03) offers the first data set in which the sinking flux of carbon and trace elements can be derived using four different radionuclide pairs ( 238 U :234 Th ;210 Pb: 210 Po; 228 Ra: 228 Th; and 234 U: 230 Th) at stations co-located with sediment trap fluxes for comparison. Particulate organic carbon, particulate P, and particulate Cd fluxes all decrease sharply with depth below the euphotic zone. Particulate Mn, Cu, and Co flux profiles display mixed behavior, some cases reflecting biotic remineralization, and other cases showing increased flux with depth. The latter may be related to either lateral input of lithogenic material or increased scavenging onto particles. Lastly, particulate Fe fluxes resemble fluxes of Al and 232 Th, which all have increasing flux with depth, indicating a dominance of lithogenic flux at depth by resuspended sediment transported laterally to the study site. In comparing flux estimates derived using different isotope pairs, differences result from different timescales of integration and particle size fractionation effects. The range in flux estimates produced by different methods provides a robust constraint on the true removal fluxes, taking into consideration the independent uncertainties associated with each method. These estimates will be valuable targets for biogeochemical modeling and may also offer insight into particle sinking processes. ©2018. 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/160176
Appears in Collections:气候变化与战略

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作者单位: School of Ocean Science and Engineering, University of Southern Mississippi Stennis Space CenterMS, United States; Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Department of Earth and Environmental Sciences, Columbia University, New York, NY, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Department of Geology, Wayne State University, Detroit, MI, United States; Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China; Department of Earth Sciences, University of Minnesota, Minneapolis, MN, United States; School of Marine and Atmospheric Science, Stony Brook University, Stony Brook, NY, United States; Ocean Sciences Department, University of California, Santa Cruz, CA, United States; Earth Observatory of Singapore, Nanyang Technical University, Singapore; Bigelow Laboratory for Ocean Sciences, East Boothbay, ME, United States; School of Earth and Environmental Sciences, Queens College, City University of New York, Flushing, NY, United States; Earth and Environmental Sciences Program, The Graduate Center, City University of New York, New York, NY, United States

Recommended Citation:
Hayes C.T.,Black E.E.,Anderson R.F.,et al. Flux of Particulate Elements in the North Atlantic Ocean Constrained by Multiple Radionuclides[J]. Global Biogeochemical Cycles,2018-01-01,32(12)
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