DOI: 10.1002/2014GB004935
Scopus记录号: 2-s2.0-85027943134
论文题名: Effects of sinking velocities and microbial respiration rates on the attenuation of particulate carbon fluxes through the mesopelagic zone
作者: McDonnell A ; M ; P ; , Boyd P ; W ; , Buesseler K ; O
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 2 起始页码: 175
结束页码: 193
语种: 英语
英文关键词: biological pump
; carbon flux
; marine particles
; microbial respiration
; sinking velocity
Scopus关键词: carbon flux
; carbon sequestration
; mesopelagic zone
; microbial activity
; particulate flux
; respiration
; sediment trap
; time series
; water depth
; Antarctic Peninsula
; Antarctica
; West Antarctica
英文摘要: The attenuation of sinking particle fluxes through the mesopelagic zone is an important process that controls the sequestration of carbon and the distribution of other elements throughout the oceans. Case studies at two contrasting sites, the oligotrophic regime of the Bermuda Atlantic Time-series Study (BATS) and the mesotrophic waters of the west Antarctic Peninsula (WAP) sector of the Southern Ocean, revealed large differences in the rates of particle-attached microbial respiration and the average sinking velocities of marine particles, two parameters that affect the transfer efficiency of particulate matter from the base of the euphotic zone into the deep ocean. Rapid average sinking velocities of 270 ± 150 m d-1 were observed along the WAP, whereas the average velocity was 49 ± 25 m d-1 at the BATS site. Respiration rates of particle-attached microbes were measured using novel RESPIRE (REspiration of Sinking Particles In the subsuRface ocEan) sediment traps that first intercepts sinking particles then incubates them in situ. RESPIRE experiments yielded flux-normalized respiration rates of 0.4 ± 0.1 day-1 at BATS when excluding an outlier of 1.52 day-1, while these rates were undetectable along the WAP (0.01 ± 0.02 day-1). At BATS, flux-normalized respiration rates decreased exponentially with respect to depth below the euphotic zone with a 75% reduction between the 150 and 500 m depths. These findings provide quantitative and mechanistic insights into the processes that control the transfer efficiency of particle flux through the mesopelagic and its variability throughout the global oceans. ©2015. 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/78021
Appears in Collections: 气候变化事实与影响
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作者单位: School of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Fairbanks, AK, United States; Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia; NIWA Centre for Chemical and Physical Oceanography, Department of Chemistry, University of Otago, Dunedin, New Zealand; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Recommended Citation:
McDonnell A,M,P,et al. Effects of sinking velocities and microbial respiration rates on the attenuation of particulate carbon fluxes through the mesopelagic zone[J]. Global Biogeochemical Cycles,2015-01-01,29(2)