气候变化领域集成服务门户(CCPortal): Estimating the Cross-Shelf Export of Riverine Materials: Part 2. Estimates of Global Freshwater and Nutrient Export

CCPortal

DOI	10.1002/2017GB005668
	Estimating the Cross-Shelf Export of Riverine Materials: Part 2. Estimates of Global Freshwater and Nutrient Export
	Izett J.G.; Fennel K.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	176
结束页码	186
卷号	32 期号:2
英文摘要	Rivers deliver large amounts of fresh water, nutrients, and other terrestrially derived materials to the coastal ocean. Where inputs accumulate on the shelf, harmful effects such as hypoxia and eutrophication can result. In contrast, where export to the open ocean is efficient riverine inputs contribute to global biogeochemical budgets. Assessing the fate of riverine inputs is difficult on a global scale. Global ocean models are generally too coarse to resolve the relatively small scale features of river plumes. High-resolution regional models have been developed for individual river plume systems, but it is impractical to apply this approach globally to all rivers. Recently, generalized parameterizations have been proposed to estimate the export of riverine fresh water to the open ocean (Izett & Fennel, 2018, https://doi.org/10.1002/2017GB005667; Sharples et al., 2017, https://doi.org/10.1002/2016GB005483). Here the relationships of Izett and Fennel (), https://doi.org/10.1002/2017GB005667 are used to derive global estimates of open-ocean export of fresh water and dissolved inorganic silicate, dissolved organic carbon, and dissolved organic and inorganic phosphorus and nitrogen. We estimate that only 15–53% of riverine fresh water reaches the open ocean directly in river plumes; nutrient export is even less efficient because of processing on continental shelves. Due to geographic differences in riverine nutrient delivery, dissolved silicate is the most efficiently exported to the open ocean (7–56.7%), while dissolved inorganic nitrogen is the least efficiently exported (2.8–44.3%). These results are consistent with previous estimates and provide a simple way to parameterize export to the open ocean in global models. ©2017. American Geophysical Union. All Rights Reserved.
英文关键词	coastal processes; global estimates; nutrients; ocean; river plumes
语种	英语
scopus关键词	biogeochemical cycle; environmental fate; estimation method; eutrophication; freshwater; global change; hypoxia; nutrient dynamics; open ocean; river plume; shelf dynamics; Foeniculum vulgare
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/129862
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 2. Estimates of Global Freshwater and Nutrient Export[J],2018,32(2).
APA	Izett J.G.,&Fennel K..(2018).Estimating the Cross-Shelf Export of Riverine Materials: Part 2. Estimates of Global Freshwater and Nutrient Export.Global Biogeochemical Cycles,32(2).
MLA	Izett J.G.,et al."Estimating the Cross-Shelf Export of Riverine Materials: Part 2. Estimates of Global Freshwater and Nutrient Export".Global Biogeochemical Cycles 32.2(2018).