DOI: 10.1002/2017GB005667
Scopus记录号: 2-s2.0-85041318068
论文题名: Estimating the Cross-Shelf Export of Riverine Materials: Part 1. General Relationships From an Idealized Numerical Model
作者: Izett J ; G ; , Fennel K
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2018
卷: 32, 期: 2 起始页码: 160
结束页码: 175
语种: 英语
英文关键词: coastal processes
; modeling
; nutrients
; ocean
; river plumes
Scopus关键词: accuracy assessment
; biogeochemical cycle
; dimensionless number
; freshwater ecosystem
; hypoxia
; numerical model
; open ocean
; parameterization
; primary production
; river plume
英文摘要: Rivers deliver large amounts of terrestrially derived materials (such as nutrients, sediments, and pollutants) to the coastal ocean, but a global quantification of the fate of this delivery is lacking. Nutrients can accumulate on shelves, potentially driving high levels of primary production with negative consequences like hypoxia, or be exported across the shelf to the open ocean where impacts are minimized. Global biogeochemical models cannot resolve the relatively small-scale processes governing river plume dynamics and cross-shelf export; instead, river inputs are often parameterized assuming an “all or nothing” approach. Recently, Sharples et al. (2017), https://doi.org/10.1002/2016GB005483 proposed the SP number—a dimensionless number relating the estimated size of a plume as a function of latitude to the local shelf width—as a simple estimator of cross-shelf export. We extend their work, which is solely based on theoretical and empirical scaling arguments, and address some of its limitations using a numerical model of an idealized river plume. In a large number of simulations, we test whether the SP number can accurately describe export in unforced cases and with tidal and wind forcings imposed. Our numerical experiments confirm that the SP number can be used to estimate export and enable refinement of the quantitative relationships proposed by Sharples et al. We show that, in general, external forcing has only a weak influence compared to latitude and derive empirical relationships from the results of the numerical experiments that can be used to estimate riverine freshwater export to the open ocean. ©2017. 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/77669
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Oceanography, Dalhousie University, Halifax, NS, Canada; Department of Geoscience and Remote Sensing, Delft University of Technology, Delft, Netherlands
Recommended Citation:
Izett J,G,, Fennel K. Estimating the Cross-Shelf Export of Riverine Materials: Part 1. General Relationships From an Idealized Numerical Model[J]. Global Biogeochemical Cycles,2018-01-01,32(2)