DOI: 10.1002/2015GB005276
Scopus记录号: 2-s2.0-84957641902
论文题名: Annual cycles of phytoplankton biomass in the subarctic Atlantic and Pacific Ocean
作者: Westberry T ; K ; , Schultz P ; , Behrenfeld M ; J ; , Dunne J ; P ; , Hiscock M ; R ; , Maritorena S ; , Sarmiento J ; L ; , Siegel D ; A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期: 2 起始页码: 175
结束页码: 190
语种: 英语
英文关键词: phytoplankton
; remote sensing
Scopus关键词: algal bloom
; annual cycle
; bioaccumulation
; biomass
; carbon
; carbon dioxide
; chlorophyll
; ecosystem dynamics
; environmental conditions
; growth response
; iron
; nutrient uptake
; phytoplankton
; remote sensing
; Atlantic Ocean
; Atlantic Ocean (North)
; Pacific Ocean
; Pacific Ocean (Northeast)
; Pacific Ocean (Subarctic)
英文摘要: High-latitude phytoplankton blooms support productive fisheries and play an important role in oceanic uptake of atmospheric carbon dioxide. In the subarctic North Atlantic Ocean, blooms are a recurrent feature each year, while in the eastern subarctic Pacific only small changes in chlorophyll (Chl) are seen over the annual cycle. Here we show that when evaluated using phytoplankton carbon biomass (Cphyto) rather than Chl, an annual bloom in the North Pacific is evident and can even rival blooms observed in the North Atlantic. The annual increase in subarctic Pacific phytoplankton biomass is not readily observed in the Chl record because it is paralleled by light- and nutrient-driven decreases in cellular pigment levels (Cphyto:Chl). Specifically, photoacclimation and iron stress effects on Cphyto:Chl oppose the biomass increase, leading to only modest changes in bulk Chl. The magnitude of the photoacclimation effect is quantified using descriptors of the near-surface light environment and a photophysiological model. Iron stress effects are diagnosed from satellite chlorophyll fluorescence data. Lastly, we show that biomass accumulation in the Pacific is slower than that in the Atlantic but is closely tied to similar levels of seasonal nutrient uptake in both basins. Annual cycles of satellite-derived Chl and Cphyto are reproduced by in situ autonomous profiling floats. These results contradict the long-standing paradigm that environmental conditions prevent phytoplankton accumulation in the subarctic Northeast Pacific and suggest a greater seasonal decoupling between phytoplankton growth and losses than traditionally implied. Further, our results highlight the role of physiological processes in shaping bulk properties, such as Chl, and their interpretation in studies of ocean ecosystem dynamics and climate change. ©2016. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77886
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, United States; Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, NJ, United States; Geophysical Fluid Dynamics Laboratory, NOAA, Princeton, NJ, United States; Earth Research Institute, University of California, Santa Barbara, CA, United States
Recommended Citation:
Westberry T,K,, Schultz P,et al. Annual cycles of phytoplankton biomass in the subarctic Atlantic and Pacific Ocean[J]. Global Biogeochemical Cycles,2016-01-01,30(2)