The distribution of chlorophyll a in the tropical eastern Indian Ocean in austral summer

查看全文 作　　者：HONG [1,2]Lisha;WANG [1,2]Chunsheng;ZHOU [1,2]Yadong;CHEN [3]Mianrun;LIU [3]Hongbin;LIN [1,4]Zhongyang;SONG [1,5]Xunshu

机构地区：[1]The Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China;[2]Laboratory of Marine Ecosystem and Biogeochemistry,State Oceanic Administration,Hangzhou 310012,China;[3]Division of Life Science,Hong Kong University of Science and Technology,Hong Kong,China;[4]Key Laboratory of Submarine Geosciences,State Oceanic Administration,Hangzhou 310012,China;[5]State Key Laboratory of Satellite Ocean Environment Dynamics,Hangzhou 310012,China

出　　处：《Acta Oceanologica Sinica》索引2012年第31卷第5期,共14页

基　　金：China Ocean Mineral Resources R & D Association under contract No. DY125-13-E-01;the Scientific Research Fund of the Second Institute of Oceanography, State Oceanic Administration under contract No. JG1024 摘　　要：To study the effect of hydrographic factors on the spatial distributions of chlorophyll a (Chl a), an investigation was carried out in the tropical eastern Indian Ocean (80 -100 E along 7 S, and 7 -18 S along 80 E) in December 2010. The fluorescent method was used to obtain total Chl a and size-fractioned Chl a at the 26 stations. The results show that surface Chl a concentration averaged at (0.168 ± 0.095) mg/m 3 s.d. (range: 0.034-0.475 mg/m 3 ), concentrations appeared to be higher in the west for longitudinal variations, and higher in the north for latitudinal variations. Furthermore, the surface Chl a concentration was lower (0.034-0.066 mg/m 3 ) in the region to the south of 16 S. There was a strong subsurface Chl a maximum layer at all stations and the depth of the Chl a maximum increased towards to the east and south along with the respective nitracline. The spatial variation of Chl a was significant: correlation and regression analysis suggests that it was primarily affected by PO 3 4 , N(NO 3 -N+NO 2 -N) and temperature. Size-fractionated Chl a concentration clearly showed that the study area was a typical oligotrophic open ocean, in which picophytoplankton dominated, accounting for approximately 67.8% of total Chl a, followed by nanophytoplankton (24.5%) and microphytoplankton (7.6%). The two larger fractions were sensitive to the limitation of P, while picophytoplankton was primarily affected by temperature. 关键词：叶绿素A浓度东印度洋热带微微型浮游植物南半球夏季空间分布水文要素

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The distribution of chlorophyll a in the tropical eastern Indian Ocean in austral summer

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