DOI: 10.1002/2015GB005303
Scopus记录号: 2-s2.0-84960376027
论文题名: Linking nutrient loading and oxygen in the coastal ocean: A new global scale model
作者: Reed D ; C ; , Harrison J ; A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期: 3 起始页码: 447
结束页码: 459
语种: 英语
英文关键词: bottom water oxygen
; coastal ocean
; environmental change
; eutrophication
; hypoxia
; nutrient loading
Scopus关键词: anoxic conditions
; biogeochemical cycle
; bottom water
; environmental change
; eutrophication
; global perspective
; hypoxia
; iron
; marine ecosystem
; numerical model
; nutrient cycling
; nutrient dynamics
; organic matter
; oxic conditions
; oxygen
; reduction
; respiration
; stratification
; sulfate
; surface water
; Atlantic Ocean
; Gulf of Mexico
英文摘要: Recent decades have witnessed an exponential spread of low-oxygen regions in the coastal ocean due at least in-part to enhanced terrestrial nutrient inputs. As oxygen deprivation is a major stressor on marine ecosystems, there is a great need to quantitatively link shifts in nutrient loading with changes in oxygen concentrations. To this end, we have developed and here describe, evaluate, and apply the Coastal Ocean Oxygen Linked to Benthic Exchange And Nutrient Supply (COOLBEANS) model, a first-of-its-kind, spatially explicit (with 152 coastal segments) model, global model of coastal oxygen and nutrient dynamics. In COOLBEANS, benthic oxygen demand (BOD) is calculated using empirical models for aerobic respiration, iron reduction, and sulfate reduction, while oxygen supply is represented by a simple parameterization of exchange between surface and bottom waters. A nutrient cycling component translates shifts in riverine nutrient inputs into changes in organic matter delivery to sediments and, ultimately, oxygen uptake. Modeled BOD reproduces observations reasonably well (Nash-Sutcliffe efficiency = 0.71), and estimates of exchange between surface and bottom waters correlate with stratification. The model examines sensitivity of bottom water oxygen to changes in nutrient inputs and vertical exchange between surface and bottom waters, highlighting the importance of this vertical exchange in defining the susceptibility of a system to oxygen depletion. These sensitivities along with estimated maximum hypoxic areas that are supported by present day nutrient loads are consistent with existing hypoxic regions. Sensitivities are put into context by applying historic changes in nitrogen loading observed in the Gulf of Mexico to the global coastal ocean, demonstrating that such loads would drive many systems anoxic or even sulfidic. ©2016. 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/77870
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: School of the Environment, Washington State University, Vancouver, WA, United States
Recommended Citation:
Reed D,C,, Harrison J,et al. Linking nutrient loading and oxygen in the coastal ocean: A new global scale model[J]. Global Biogeochemical Cycles,2016-01-01,30(3)