Comparisons of surface Chl a and primary productivity along three transects of the southern South China Sea,northern Java Sea and eastern Indian Ocean in April 2011 |
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| Authors: | YI Rong KE Zhi-xin SONG Xing-yu SHEN Ping-ping WANG Sheng-fu FAN Yan-zhi HUANG Liang-min TAN Ye-hui LI Gang |
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| Institution: | Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of 0ceanology, Chinese Academy of Sciences, Guangzhou 510301, China |
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| Abstract: | Results are presented about the changes in chlorophyll a density, carbon fixation and nutrient levels in the surface waters of three transects of the southern South China Sea(SCS), northern Java Sea(JS) and eastern Indian Ocean(IO) during April 5~16 of 2011. The in situ Chl a concentration and carbon fixation showed decreasing trends from high to low latitude along the three transects, while the photosynthetic rate of phytoplankton estimated from 14 C incorporation displayed no simple variation with latitude. Chl a concentration and carbon fixation in the IO water was lower than that in the JS water. Higher salinity and lower contents of dissolved inorganic nitrogen(DIN) and silicate(Si O2-3) characterized the IO water as compared to the SCS or JS water, and the PO3-4 content was lower in the IO water than in the SCS or JS water in most cases. Our results also indicate the importance of DIN and Si O2-3 concentrations for the geographical changes in phytoplankton biomass and primary productivity among the three regions. |
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| Keywords: | carbon fixation phytoplankton southern South China Sea northern Java Sea eastern Indian Ocean |
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