The size-fractionated chlorophyll a and primary productivity in the Bering Sea during the summer of 2003

作     者：LIU Zilin CHEN Jianfang CHEN Zhongyuan ZHANG Tao ZHANG Haisheng 

作者机构：Key Laboratory of Marine Ecosystem and Biogeochemistry State Oceanic Administration Hangzhou 310012 China Key Laboratory of Marine Ecosystem and Biogeochemistry State Oceanic Administration Hangzhou 310012 China Key Laboratory of Marine Ecosystem and Biogeochemistry State Oceanic Administration Hangzhou 310012 China Key Laboratory of Ocean Dynamic Processes and Satellite Oceanography State Oceanic Administration Hangzhou 310012 China Key Laboratory of Marine Ecosystem and Biogeochemistry State Oceanic Administration Hangzhou 310012 China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2005年第24卷第6期

页      面：127-134页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 0908[农学-水产] 0707[理学-海洋科学] 

基　　金：supported by the National Natural Science Foundation of China under contract Nos 40476004 and 40476003. 

主　　题：chlorophyll a primary productivity the size-fractionated bering sea 

摘      要：Investigations of chlorophyll a and primary productivity were carried out inthe Bering Sea along the BR line and the BS line during the Second Chinese National Arctic ResearchExpedition in the summer of 2003. The results showed that the surface chlorophyll a concentrationswere 0.199～1.170 μg/dm^3, and the average value was 0.723 μg/dm^3 on the BR line. For the BSline, the surface chlorophyll a concentrations were 0.519～4.644 μg/dm^3 (average 1.605 μg/dm^3)and 0.568～14.968 μg/dm^3 (average 5.311 μg/dm^3) during the early and late summer, respectively.The average value in the late summer was much higher than that in the early summer. The high values(more than 4.0 μg/dm^3) occurred at stations of the BS line in the southern Bering Strait. Thechlorophyll a concentrations in the subsurface layer were higher than those in the surface layer.The results of the size-fractionated chlorophyll a showed that the contribution of the picoplanktonto total chlorophyll a was the predominance at the early summer and the contribution of thenetplankton was the predominance at the late summer. The carbon potential primary productivitiesvaried between 0.471 and 1.147 mg/(m^3·h) on the BR line, with average rates of 0.728 mg/(m^3·h).The primary productivities on the BS line were much higher than those of the BR line, ranging from1.227 mg/(m^3·h) at the early summer to 19.046 mg/(m^3·h) at the late summer. The results of thesize-fractionated primary productivity showed that the contribution of the nanoplankton to totalproductivity was the predominance at the early summer and the contribution of the netplankton waspredominance at the late summer. The assimilation number of photosynthesis was 0.45～2.80 mg/(mg·h)in the surveyed stations.