DOI: 10.1002/2017JC012846
Scopus记录号: 2-s2.0-85041229810
论文题名: Physical and Biological Drivers of Biogeochemical Tracers Within the Seasonal Sea Ice Zone of the Southern Ocean From Profiling Floats
作者: Briggs E.M. ; Martz T.R. ; Talley L.D. ; Mazloff M.R. ; Johnson K.S.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 2 起始页码: 746
结束页码: 758
语种: 英语
英文关键词: biogeochemistry
; profiling float
; SOCCOM
; Southern Ocean
Scopus关键词: alkalinity
; annual cycle
; dissolved inorganic carbon
; ice cover
; light availability
; mixed layer
; net primary production
; phytoplankton
; respiration
; sea ice
; tracer
; Cross Seamount
; Pacific Ocean
; Ross Sea
; Southern Ocean
; Redfieldia
英文摘要: Here we present initial findings from nine profiling floats equipped with pH, O2, NO- 3, and other biogeochemical sensors that were deployed in the seasonal ice zone (SIZ) of the Southern Ocean in 2014 and 2015 through the Southern Ocean Carbon and Climate Observations and Modelling (SOCCOM) project. A large springtime phytoplankton bloom was observed that coincided with sea ice melt for all nine floats. We argue this bloom results from a shoaling of the mixed layer depth, increased vertical stability, and enhanced nutrient and light availability as the sea ice melts. This interpretation is supported by the absence of a springtime bloom when one of the floats left the SIZ in the second year of observations. During the sea ice covered period, net heterotrophic conditions were observed. The rate of uptake of O2 and release of dissolved inorganic carbon (derived from pH and estimated total alkalinity) and NO- 3 is reminiscent of biological respiration and is nearly Redfieldian for the nine floats. A simple model of mixed layer physics was developed to separate the physical and biological components of the signal in pH and O2 over one annual cycle for a float in the Ross Sea SIZ. The resulting annual net community production suggests that seasonal respiration during the ice covered period of the year nearly balances the production in the euphotic layer of up to 5 mol C m−2 during the ice free period leading to a net of near zero carbon exported to depth for this one float. © 2017. 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/114613
Appears in Collections: 气候减缓与适应
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作者单位: Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, United States; Monterey Bay Aquarium Research Institute, Moss Landing, CA, United States
Recommended Citation:
Briggs E.M.,Martz T.R.,Talley L.D.,et al. Physical and Biological Drivers of Biogeochemical Tracers Within the Seasonal Sea Ice Zone of the Southern Ocean From Profiling Floats[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(2)