DOI: 10.1002/2013GB004735
Scopus记录号: 2-s2.0-84901101590
论文题名: Variability in under-ice export fluxes of biogenic matter in the Arctic Ocean
作者: Lalande C ; , Nöthig E ; -M ; , Somavilla R ; , Bauerfeind E ; , Shevchenko V ; , Okolodkov Y
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 5 起始页码: 571
结束页码: 583
语种: 英语
英文关键词: Arctic Ocean
; export
; ice
; nutrient supply
; sediment trap
Scopus关键词: Nutrients
; Oceanography
; Plankton
; Sediment traps
; Arctic ocean
; export
; Nutrient supply
; Organic carbon cycle
; Particulate Matter
; Particulate organic carbon
; Spatial and temporal variability
; Total particulate matter
; Ice
; biogenic emission
; carbon cycle
; ice cover
; ice flow
; ice thickness
; nutrient dynamics
; particulate organic carbon
; primary production
; sediment trap
; spatiotemporal analysis
; Arctic
; Arctic Ocean
; Fram Strait
; Laptev Sea
英文摘要: A critical question regarding the organic carbon cycle in the Arctic Ocean is whether the decline in ice extent and thickness and the associated increase in solar irradiance in the upper ocean will result in increased primary production and particulate organic carbon (POC) export. To assess spatial and temporal variability in POC export, under-ice export fluxes were measured with short-term sediment traps in the northern Laptev Sea in July-August-September 1995, north of the Fram Strait in July 1997, and in the Central Arctic in August-September 2012. Sediment traps were deployed at 2-5 m and 20-25 m under ice for periods ranging from 8.5 to 71 h. In addition to POC fluxes, total particulate matter, chlorophyll a, biogenic particulate silica, phytoplankton, and zooplankton fecal pellet fluxes were measured to evaluate the amount and composition of the material exported in the upper Arctic Ocean. Whereas elevated export fluxes observed on and near the Laptev Sea shelf were likely the combined result of high primary production, resuspension, and release of particulate matter from melting ice, low export fluxes above the central basins despite increased light availability during the record minimum ice extent of 2012 suggest that POC export was limited by nutrient supply during summer. These results suggest that the ongoing decline in ice cover affects export fluxes differently on Arctic shelves and over the deep Arctic Ocean and that POC export is likely to remain low above the central basins unless additional nutrients are supplied to surface waters. Key Points High under-ice export fluxes were observed on the northern Laptev Sea shelf Low under-ice export fluxes were observed above the central basin Nutrient supply is limiting export fluxes during summer above the central basin ©2014. 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/77536
Appears in Collections: 气候变化事实与影响
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作者单位: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russian Federation; Instituto de Ciencias Marinas y Pesquerías, Universidad Veracruzana Veracruz, Boca del Río, Mexico
Recommended Citation:
Lalande C,, Nöthig E,-M,et al. Variability in under-ice export fluxes of biogenic matter in the Arctic Ocean[J]. Global Biogeochemical Cycles,2014-01-01,28(5)