DOI: 10.1002/gbc.20073
Scopus记录号: 2-s2.0-84881531801
论文题名: A modeling assessment of the role of reversible scavenging in controlling oceanic dissolved Cu and Zn distributions
作者: Little S ; H ; , Vance D ; , Siddall M ; , Gasson E
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 3 起始页码: 780
结束页码: 791
语种: 英语
英文关键词: copper
; modeling
; reversible scavenging
; seawater
; zinc
Scopus关键词: Cu concentrations
; Elemental distribution
; Lateral advections
; One-dimensional model
; Particulate organic carbon
; Scavenging coefficients
; Sinking particles
; Vertical distributions
; Advection
; Copper
; Dissolution
; Models
; Nutrients
; Seawater
; Zinc
; Process control
; assessment method
; biological uptake
; concentration (composition)
; data set
; diffusion
; dissolved matter
; numerical model
; trace element
; vertical profile
; Pacific Ocean
英文摘要: The balance of processes that control elemental distributions in the modern oceans is important in understanding both their internal recycling and the rate and nature of their eventual output to sediment. Here we seek to evaluate the likely controls on the vertical profiles of Cu and Zn. Though the concentrations of both Cu and Zn increase with depth, Cu increases in a more linear fashion than Zn, which exhibits a typical "nutrient-type" profile. Both elements are bioessential, and biological uptake and regeneration has often been cited as an important process in controlling their vertical distribution. In this study, we investigate the likely importance of another key vertical process, that of passive scavenging on sinking particles, via a simple one-dimensional model of reversible scavenging. We find that, despite the absence of lateral or vertical water advection, mixing, diffusion, or biological uptake, our reversible scavenging model is very successful in replicating dissolved Cu concentration profiles on a range of geographic scales. We provide preliminary constraints on the scavenging coefficients for Cu for a spectrum of particle types (calcium carbonate, opal, particulate organic carbon, and dust) while emphasizing the fit of the shape of the modeled profile to that of the tracer data. In contrast to Cu, and reaffirming the belief that Zn behaves as a true micronutrient, the scavenging model is a poor match to the shape of oceanic Zn profiles. Modeling a single vertical process simultaneously highlights the importance of lateral advection in generating high Zn concentrations in the deep Pacific. Key Points A 1-D reversible scavenging model is applied to oceanic [Cu] and [Zn]Dissolved Cu is well described by the process of reversible scavengingDissolved Zn is not, reflecting its behaviour as a true nutrient-type element ©2013. 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/77592
Appears in Collections: 气候变化事实与影响
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作者单位: School of Earth Sciences, University of Bristol, Bristol, United Kingdom; Department of Earth Sciences, Institute of Geochemistry and Petrology, NW D81.4, Clausiusstrasse 25, CH-8092 Zürich, Switzerland; Climate System Research Center, University of Massachusetts, Amherst, MS, United States
Recommended Citation:
Little S,H,, Vance D,et al. A modeling assessment of the role of reversible scavenging in controlling oceanic dissolved Cu and Zn distributions[J]. Global Biogeochemical Cycles,2013-01-01,27(3)