Chlorophyll a and primary production in the Chinese Contract Area in the east-north Pacific

CHEN Xing-qun; LIN Rong-cheng

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CHEN Xing-qun, LIN Rong-cheng. Chlorophyll a and primary production in the Chinese Contract Area in the east-north Pacific[J]. Haiyang Xuebao, 2007, 29(5): 146-153.

Citation:

CHEN Xing-qun, LIN Rong-cheng. Chlorophyll a and primary production in the Chinese Contract Area in the east-north Pacific[J]. Haiyang Xuebao, 2007, 29(5): 146-153.

CHEN Xing-qun, LIN Rong-cheng. Chlorophyll a and primary production in the Chinese Contract Area in the east-north Pacific[J]. Haiyang Xuebao, 2007, 29(5): 146-153.

Citation:

CHEN Xing-qun, LIN Rong-cheng. Chlorophyll a and primary production in the Chinese Contract Area in the east-north Pacific[J]. Haiyang Xuebao, 2007, 29(5): 146-153.

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Chlorophyll a and primary production in the Chinese Contract Area in the east-north Pacific

Third Oceanography Institute, State Oceanic Administration Xiamen 361005, China

Received Date: 2006-03-18
Rev Recd Date: 2006-11-30

Abstract

Abstract

It was for med based on the data obtained from the east and west regions of Chinese Contract Area in the NE of Pacific Ocean during 6 surveys, DY85-4, DY95-7, DY95-8, DY95-10, DY105-11 and DY105-12.14, in years from 1994 to 2003.The result shows that the maximum chlorophylla distribution was located under the subsurface water layer, following the general distribution pattern for Chlorophylla.It was measured that the chlorophylla around 0.1 mg/m³ was found from the surface water to 50 m depth and around 0.2~0.4 mg/m³ was from 50 to 100 m.It diminished below 100m depth and zeroed particularly at 150 m depth.The primary production(C) in range from 76.8~191.9 mg/(m²·d) with average 116.1 mg/(m²·d) was located in the east region, and the production from 73.1 to 222.5 mg/(m²·d) with average 127.1 mg/(m²·d) was in the west region.The picoplanktonic chlorophyll a in particle size from 0.2 to 2μm was accounted for more than 70% of the total and it decreased to less than 50% in depth below 125 m.The particles with size from 2 to 20μm and over 20μm were only accounted for less than 30% of the total at depth from 0 to 125 m while it rose above 50% below 125 m depth.It demonstrated that the primary production in both regions should be classified as the areas of lower productivity.
- Chinese Contract Area in the NE of Pacific Ocean,
- chlorophyll a,
- chlorophyll a in particlesize,
- primary production

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