DOI: 10.1029/2018GB005985
论文题名: Insights From the 238 U- 234 Th Method Into the Coupling of Biological Export and the Cycling of Cadmium, Cobalt, and Manganese in the Southeast Pacific Ocean
作者: Black E.E. ; Lam P.J. ; Lee J.-M. ; Buesseler K.O.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2019
卷: 33, 期: 1 语种: 英语
英文关键词: cadmium
; cobalt
; concentration (composition)
; food web
; global climate
; manganese
; marine environment
; precipitation (chemistry)
; redox conditions
; residence time
; scavenging (chemistry)
; thorium
; trace metal
; upper ocean
; uranium isotope
; Pacific Ocean
; Pacific Ocean (Southeast)
学科: export
; residence time
; thorium
; trace metals
中文摘要: Better constraints on the magnitude of particulate export and the residence times of trace elements are required to understand marine food web dynamics, track the transport of anthropogenic trace metals in the ocean, and improve global climate models. While prior studies have been successful in constructing basin-scale budgets of elements like carbon in the upper ocean, the cycling of particulate trace metals is poorly understood. The 238 U- 234 Th method is used here with data from the GP-16 GEOTRACES transect to investigate the upper ocean processes controlling the particulate export of cadmium, cobalt, and manganese in the southeastern Pacific. Patterns in the flux data indicated that particulate cadmium and cobalt behave similarly to particulate phosphorus and organic carbon, with the highest export in the productive coastal region and decreasing flux with depth due to remineralization. The export of manganese was influenced by redox conditions at the low oxygen coastal stations and by precipitation and/or scavenging elsewhere. Residence times with respect to export (total inventory divided by particulate flux) for phosphorus, cadmium, cobalt, and manganese in the upper 100 and 200 m were determined to be on the order of months to years. These GEOTRACES-based synthesis efforts, combining a host of concentration and tracer data with unprecedented resolution, will help to close the oceanic budgets of trace metals. ©2018. 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/160168
Appears in Collections: 气候变化与战略
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作者单位: Ocean Frontier Institute, Dalhousie University, Halifax, NS, Canada; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Ocean Sciences Department, Institute of Marine Sciences, University of California, Santa Cruz, CA, United States
Recommended Citation:
Black E.E.,Lam P.J.,Lee J.-M.,et al. Insights From the 238 U- 234 Th Method Into the Coupling of Biological Export and the Cycling of Cadmium, Cobalt, and Manganese in the Southeast Pacific Ocean[J]. Global Biogeochemical Cycles,2019-01-01,33(1)