气候变化领域集成服务门户(CCPortal): Estimating the Cross-Shelf Export of Riverine Materials: Part 1. General Relationships From an Idealized Numerical Model

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DOI	10.1002/2017GB005667
	Estimating the Cross-Shelf Export of Riverine Materials: Part 1. General Relationships From an Idealized Numerical Model
	Izett J.G.; Fennel K.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	160
结束页码	175
卷号	32 期号:2
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.
英文关键词	coastal processes; modeling; nutrients; ocean; river plumes
语种	英语
scopus关键词	accuracy assessment; biogeochemical cycle; dimensionless number; freshwater ecosystem; hypoxia; numerical model; open ocean; parameterization; primary production; river plume
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129864
作者单位	Department of Oceanography, Dalhousie University, Halifax, NS, Canada; Department of Geoscience and Remote Sensing, Delft University of Technology, Delft, Netherlands
推荐引用方式 GB/T 7714	Izett J.G.,Fennel K.. Estimating the Cross-Shelf Export of Riverine Materials: Part 1. General Relationships From an Idealized Numerical Model[J],2018,32(2).
APA	Izett J.G.,&Fennel K..(2018).Estimating the Cross-Shelf Export of Riverine Materials: Part 1. General Relationships From an Idealized Numerical Model.Global Biogeochemical Cycles,32(2).
MLA	Izett J.G.,et al."Estimating the Cross-Shelf Export of Riverine Materials: Part 1. General Relationships From an Idealized Numerical Model".Global Biogeochemical Cycles 32.2(2018).