DOI: 10.1002/2017GB005668
Scopus记录号: 2-s2.0-85041598179
论文题名: Estimating the Cross-Shelf Export of Riverine Materials: Part 2. Estimates of Global Freshwater and Nutrient Export
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: 176
结束页码: 186
语种: 英语
英文关键词: coastal processes
; global estimates
; nutrients
; ocean
; river plumes
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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77663
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 2. Estimates of Global Freshwater and Nutrient Export[J]. Global Biogeochemical Cycles,2018-01-01,32(2)