globalchange  > 气候变化事实与影响
DOI: 10.1002/2013GB004781
Scopus记录号: 2-s2.0-84906156382
论文题名:
Understanding the seasonal dynamics of phytoplankton biomass and the deep chlorophyll maximum in oligotrophic environments: A Bio-Argo float investigation
作者: Mignot A; , Claustre H; , Uitz J; , Poteau A; , D'Ortenzio F; , Xing X
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期:8
起始页码: 856
结束页码: 876
语种: 英语
英文关键词: deep chlorophyll maximum ; oligotrophic
Scopus关键词: algal bloom ; Argo ; biomass ; chlorophyll a ; euphotic zone ; irradiance ; oligotrophic environment ; open ocean ; phytoplankton ; seasonal variation ; Mediterranean Sea ; Pacific Ocean ; Pacific Ocean (Subtropical)
英文摘要: We deployed four Bio-Argo profiling floats in various oligotrophic locations of the Pacific subtropical gyres and Mediterranean Sea to address the seasonal phytoplankton dynamics in the euphotic layer and explore its dependence on light regime dynamics. Results show that there is a similar phytoplankton biomass seasonal pattern in the four observed oceanic regions. In the lower part of the euphotic layer, the seasonal displacement of the deep chlorophyll maximum (DCM) is light driven. During winter, the chlorophyll a concentration ([Chl a]) always increases in the upper euphotic mixed layer. This increase always results from a photoacclimation to the reduced irradiance. Depending on the location, however, the concentration can also be associated with an actual increase in biomass. The winter increase in [Chl a] results in an increase in irradiance attenuation that impacts the position of the isolume (level where the daily integrated photon flux is constant) and DCM, which becomes shallower. In summer when the [Chl a] in the upper layer decreases along with light attenuation, the DCM deepens and becomes closer to (and sometimes reaches) the nitracline, which enhances the phytoplankton biomass at the DCM. The bio-optical mechanisms and their relationship to light regimes that are revealed by the time series appear to be generic and potentially characteristic of all of the areas where a DCM forms, which is 50% of the open ocean. ©2014. 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/77464
Appears in Collections:气候变化事实与影响

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作者单位: Sorbonne Universités, UPMC Université Paris 6, Observatoire Océanologique de Villefranche, Villefranche-sur-Mer, France; CNRS, UMR 7093, Observatoire Océanologique de Villefranche, Villefranche-sur-Mer, France; Massachusetts Institute of Technology, Cambridge, MA, United States; Physical Oceanography Laboratory, Ocean University of China, Qingdao, China

Recommended Citation:
Mignot A,, Claustre H,, Uitz J,et al. Understanding the seasonal dynamics of phytoplankton biomass and the deep chlorophyll maximum in oligotrophic environments: A Bio-Argo float investigation[J]. Global Biogeochemical Cycles,2014-01-01,28(8)
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