DOI: 10.1002/2014GB004825
Scopus记录号: 2-s2.0-84905635848
论文题名: Radium isotopes as a tracer of sediment-water column exchange in the North Sea
作者: Burt W ; J ; , Thomas H ; , Pätsch J ; , Omar A ; M ; , Schrum C ; , Daewel U ; , Brenner H ; , De Baar H ; J ; W
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 8 起始页码: 786
结束页码: 804
语种: 英语
英文关键词: alkalinity
; benthic fluxes
; North Sea
; radium
; sediment incubations
Scopus关键词: alkalinity
; benthic flux
; marine sediment
; radium isotope
; seasonal variation
; sediment-water interface
; stratification
; surface water
; tracer
; water column
; Atlantic Ocean
; North Sea
英文摘要: Sediment-water column exchange plays an important role in coastal biogeochemistry. We utilize short-lived radium isotopes (224Ra and 223Ra) to understand and quantify the dominant processes governing sediment-water column exchange throughout the North Sea. Our comprehensive survey, conducted in September 2011, represents the first of its kind conducted in the North Sea. We find that two main sources regulate surface Ra distributions: minor coastal input from rivers and shallow mudflats and North Sea sediments as the dominant source. Pore waters show 100-fold larger activities than the water column. North Sea sediment characteristics such as porosity and mean grain size, as well as turbulence at the sediment-water interface, are the dominant factors contributing to variability of Ra efflux. Ra inventory and mass balance approaches consistently yield high benthic Ra effluxes in the southern North Sea, driven by strong tidal and wind mixing, which in turn cause high sediment irrigation rates. These results exceed incubation-based Ra flux estimates and the majority of previously reported Ra flux estimates for other regions. Ra-based estimates of benthic alkalinity fluxes compare well to observed values, and the high rates of Ra efflux imply a potentially significant exchange of other products of sedimentary reactions, including carbon and nutrient species. Passive tracer simulations lend strong support to the Ra source attribution and imply seasonal variation in the surface water Ra distribution depending on stratification conditions. ©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/77460
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; Institute of Oceanography, University of Hamburg, Hamburg, Germany; Uni Research Climate, Norway; Geophysical Institute, University of Bergen, Norway; Geophysical Institute, University of Bergen, Hjort Centre for Marine Ecosystem Dynamics, Bergen, Norway; Nansen Environmental and Remote Sensing Center, Hjort Center for Marine Ecosystem Dynamics, Bergen, Norway; Department of Ecosystem Studies, Royal Netherlands Institute for Sea Research, Yerseke, Netherlands; Royal Netherlands Institute for Sea Research (NIOZ), Texel, Netherlands
Recommended Citation:
Burt W,J,, Thomas H,et al. Radium isotopes as a tracer of sediment-water column exchange in the North Sea[J]. Global Biogeochemical Cycles,2014-01-01,28(8)