DOI: 10.1002/2015GB005211
Scopus记录号: 2-s2.0-84945196939
论文题名: The imbalance of new and export production in the western Antarctic Peninsula, a potentially "leaky" ecosystem
作者: Stukel M ; R ; , Asher E ; , Couto N ; , Schofield O ; , Strebel S ; , Tortell P ; , Ducklow H ; W
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 9 起始页码: 1400
结束页码: 1420
语种: 英语
英文关键词: biogeochemistry
; carbon export
; Southern Ocean
; thorium-234
; vertical flux
; western Antarctic Peninsula
Scopus关键词: biogeochemistry
; carbon emission
; coastal zone
; ecological modeling
; net ecosystem production
; nitrate
; phytoplankton
; spatiotemporal analysis
; thorium isotope
; vertical distribution
; Antarctic Peninsula
; Antarctica
; Anvers Island
; Palmer Station
; Southern Ocean
; West Antarctica
英文摘要: To quantify the balance between new production and vertical nitrogen export of sinking particles, we measured nitrate uptake, net nitrate drawdown, ΔO2/Ar-based net community production, sediment trap flux, and 234Th export at a coastal site near Palmer Station, Antarctica, during the phytoplankton growing season from October 2012 to March 2013. We also measured nitrate uptake and 234Th export throughout the northern western Antarctic Peninsula (WAP) region on a cruise in January 2013. We used a nonsteady state 234Th equation with temporally varying upwelling rates and an irradiance-based phytoplankton production model to correct our export and new production estimates in the complex coastal site near Palmer Station. Results unequivocally showed that nitrate uptake and net community production were significantly greater than the sinking particle export on region-wide spatial scales and season-long temporal scales. At our coastal site, new production (105 ± 17.4 mg N m-2 d-1, mean ± standard error) was 5.3 times greater than vertical nitrogen export (20.4 ± 2.4 mg N m-2 d-1). On the January cruise in the northern WAP, new production (47.9 ± 14.4 mg N m-2 d-1) was 2.4 times greater than export (19.9 ± 1.4 mg N m-2 d-1). Much of this imbalance can be attributed to diffusive losses of particulate nitrogen from the surface ocean due to diapycnal mixing, indicative of a "leaky" WAP ecosystem. If these diffusive losses are common in other systems where new production exceeds export, it may be necessary to revise current estimates of the ocean's biological pump. ©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/77937
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Department of Earth, Ocean, and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada; Department of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ, United States; Marine Biological Laboratory, Woods Hole, MA, United States; Department of Botany, University of British Columbia, Vancouver, BC, Canada; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States
Recommended Citation:
Stukel M,R,, Asher E,et al. The imbalance of new and export production in the western Antarctic Peninsula, a potentially "leaky" ecosystem[J]. Global Biogeochemical Cycles,2015-01-01,29(9)