Spatial and temporal variability and size fractionation of chlorophyll a in the tropical and subtropical Pacific Ocean

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• 作者：ZHANG DongshengWANG ChunshengLIU ZhenshengXU XueweiWANG XiaoguZHOU Yadong
• 会议时间：2011-08-11
• 关键词：chlorophyll a ; size fractionation ; Pacific Ocean
• 作者单位：Laboratory of Marine Ecosystem and Biogeochemistry,State Oceanic Administration,Hangzhou 310012,China
• 母体文献：中国海洋研究委员会2011年会论文集
• 会议名称：中国海洋研究委员会2011年会
• 会议地点：乌鲁木齐
• 主办单位：中国海洋研究委员会
• 语种：chi

摘要

The spatial and temporal variability and size fractionation of chlorophyll a (Chl a) were investigated in the tropical and subtropical Pacific Ocean during four survey cruises from 2005 to 2009.The surface Chl a (S-Chl a) concentration ranged from 0.002 to 0.497 mg/m3 and was obviously higher in the eastern Pacific than in the western and central Pacific.The vertical distribution of Chl a displayed a single peak pattern,and the maximum Chl a layer (MCL) was observed at a shallower depth in the eastern Pacific than in the western Pacific.All three size fractions of Chl a measurements in the surface water showed a similar distribution to total Chl a and were found in higher concentrations in the eastern Pacific than in the western and central Pacific.Picoplankton dominated the phytoplankton in the surveyed tropical and subtropical Pacific Ocean.Furthermore,pico-Chl a (0.2-2 μm) accounted for a larger percentage of the total Chl a in the central Pacific than it did in the western Pacific and eastern Pacific.In the western Pacific,there seemed to be a latitudinal variability in the phytoplankton community composition where small-sized phytoplankton (<2 μm) were more dominant in the tropical than in the subtropical western Pacific.The spatial and temporal variability and size fractionation of Chl a were controlled by hydrological and chemical characteristics and climate events,such as E1 Nifio and La Ni(n)a.