气候变化领域集成服务门户(CCPortal): Modeling Dissolved and Particulate 230Th in the Canada Basin: Implications for Recent Changes in Particle Flux and Intermediate Circulation

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DOI	10.1029/2019JC015640
	Modeling Dissolved and Particulate 230Th in the Canada Basin: Implications for Recent Changes in Particle Flux and Intermediate Circulation
	Yu X.; Allen S.E.; François R.; Grenier M.; Myers P.G.; Hu X.
发表日期	2020
ISSN	21699275
卷号	125 期号:2
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.
英文关键词	230Th; Canada Basin; circulation changes; GEOTRACES; ocean modeling
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186971
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
推荐引用方式 GB/T 7714	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],2020,125(2).
APA	Yu X.,Allen S.E.,François R.,Grenier M.,Myers P.G.,&Hu X..(2020).Modeling Dissolved and Particulate 230Th in the Canada Basin: Implications for Recent Changes in Particle Flux and Intermediate Circulation.Journal of Geophysical Research: Oceans,125(2).
MLA	Yu X.,et al."Modeling Dissolved and Particulate 230Th in the Canada Basin: Implications for Recent Changes in Particle Flux and Intermediate Circulation".Journal of Geophysical Research: Oceans 125.2(2020).