DOI: 10.1029/2019JC015640
论文题名: Modeling Dissolved and Particulate 230Th in the Canada Basin: Implications for Recent Changes in Particle Flux and Intermediate Circulation
作者: Yu X. ; Allen S.E. ; François R. ; Grenier M. ; Myers P.G. ; Hu X.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2020
卷: 125, 期: 2 语种: 英语
英文关键词: 230Th
; Canada Basin
; circulation changes
; GEOTRACES
; ocean modeling
Scopus关键词: air temperature
; climate change
; climate effect
; dissolved matter
; environmental modeling
; flux measurement
; general circulation model
; global climate
; ice cover
; intermediate water
; mesoscale eddy
; oceanic circulation
; particulate matter
; scavenging (chemistry)
; sea ice
; thorium isotope
; tracer
; Arctic Ocean
; Canada Basin
英文摘要: Global climate change has had large impacts on the Arctic region including rapid reductions in sea ice and rapid increases in surface air temperatures. Documenting the consequences of these changes in the Arctic Ocean is difficult, however, because accessibility limits observations in space and time and aliases measurements. This problem can be alleviated by using geochemical tracers, which can act as natural integrators, allowing us to determine net changes over regions and years. One such tracer is (Formula presented.) Th. We use measurements and an off-line scavenging model forced by ANHA4, a regional configuration of the NEMO general circulation model, to investigate changes in the Canada Basin in the years 2002–2015. Observations show a clear decrease in (Formula presented.) Th in intermediate layers, particularly in the internal Canada Basin. The model reproduces the observed changes in (Formula presented.) Th concentration profiles. Using the model to determine the origin of the reduction shows that the decrease is due to both higher particle fluxes from increased productivity resulting from the reduction in sea ice cover and increased circulation and stirring by mesoscale eddies increasing lateral exchange between the productive coastal regions and less productive internal Canada Basin. The circulation model clearly shows increased velocities as the ice cover has decreased and storms have increased. ©2020. 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/159433
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada; Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB, Canada
Recommended Citation:
Yu X.,Allen S.E.,François R.,et al. Modeling Dissolved and Particulate 230Th in the Canada Basin: Implications for Recent Changes in Particle Flux and Intermediate Circulation[J]. Journal of Geophysical Research: Oceans,2020-01-01,125(2)