Abstracts
The Size-fractionated Chlorophyll; a Concentration and Primary Productivity in the Bering Sea in the Summer of 2008
Zilin Liu1, Jianfang Chen2, Shengquan Gao3, Hongliang Li4, Haisheng Zhang5, 6
1The Second Institute of Oceanography, SOA, Hangzhou, China, zilin1789@sina.com
2The Second Institute of Oceanography, SOA, Hangzhou, China, Biogeo_chen@hotmail.com
3The Second Institute of Oceanography, SOA, Hangzhou, China, gaosq88@163.com
4The Second Institute of Oceanography, SOA, Hangzhou, China, gambooli@hotmail.com
5The Second Institute of Oceanography, SOA, Hangzhou, China, Zhanghs@hotmail.com
6USA
Investigations of standing stock of phytoplankton (chlorophyll a) and primary productivity were carried out in the lines BR, NB and BS in the Bering Sea during the 3nd Chinese National Arctic Research Expedition in July 2008. The size-fractionated chlorophyll a and primary productivity were determined in some surveyed stations. The results showed that chlorophyll a concentration and primary productivity appeared obviously areal characteristics. The surface chlorophyll a concentration were 0.190–0.976 µg/L and the average value was 0.442 µg/L in the transect of BR. And the surface chlorophyll a concentrations were 0.142~22.405 µg/L and average value was 2.077 µg/L in the surveyed continental area. Chlorophyll a concentration in the transect BR was lower than that in the transects NB and BS. The chlorophyll a concentration above the depth 50m were higher than that below the depth 50m. Maximum concentrations appeared in the depth 30m~40m. The potential primary productivities varied from 0.173 to 0.918 mgC/(m3 h) in the surveyed area, with average rates of 0.50mgC/(m3 h). Primary productivity in the continental shelf zone was much higher than that of the deep water zone. The assimilation index of photosynthesis varied in 0.29~1.03 mgC/(mgChla h) in the surveyed area, with average rates of 0.74 mgC/(mgChla h). The results of the size-fractionated chlorophyll a and primary productivity showed that the nanoplankton and picoplankton accounted for 45.08% of the majority of the total chlorophyll a and 69.48% of total primary productivity in the surveyed area. The contributions of the microplankton to the total chlorophyll a and primary productivity were 54.92% and 30.52%, respectively. The nanoplankton and picoplankton played an important role in the ecosystem of the surveyed area.
Abstract Categories: 2.3 Arctic Change and Natural Variability
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