The distribution and structural conditions of nutrients in the Bering Sea in the summer of 2008

GAO Sheng-quan; CHEN Jian-fang; LI Hong-liang; LIU Zi-lin; LU Yong; ZHANG Hai-sheng

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GAO Sheng-quan, CHEN Jian-fang, LI Hong-liang, LIU Zi-lin, LU Yong, ZHANG Hai-sheng. The distribution and structural conditions of nutrients in the Bering Sea in the summer of 2008[J]. Haiyang Xuebao, 2011, 33(2): 157-165.

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The distribution and structural conditions of nutrients in the Bering Sea in the summer of 2008

Key Laboratory of State Oceanic Administration for Marine Ecological System and Biogeochemistry, Hangzhou 310012, China;Second Institute of Oceanograrhy, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2010-08-06

Abstract

Abstract

Distribution features and structural conditions of nutrients in the Bering Sea were observed during the third arctic research expedition of China in the summer of 2008. The results showed that the distribution and structural condition of nutrients in the Bering Sea were obviously areal characteristics. The surface average concentrations (9.73, 0.94, 11.06 μmol/dm³ respectively) of DIN, phosphate and silicate in the Bering Basin were much higher than those (0.60, 0.43, 3.74 μmol/dm³ respectively) in the continental shelf waters. The high surface concentrations of nutrients appeared mainly in the southern area of the Bering Basin and the low values occurred on the slope break and in the eastern waters of the continental shelf. The concentrations of DIN, phosphate and silicate were generally high, while chlorophyll a concentrations were low in the euphotic zone of the Bering Basin, showing typically characteristics of high-nutrients, low-chlorophyll a (HNLC). The results suggested that the biological process were not the main controlling factor for nutrient distributions in the Bering Basin, while the distributions and variations of nutrients in the continental shelf waters were not only controlled by the transport of physical process, but also affected by phytoplankton productivity and consumption of nutrient during summer. The surface average ratios of N/P, Si/P on the slope break and in continental shelf waters were 1.8, 9.9 and 3.2, 2.2 respectively. DIN-deficiency in the continental shelf waters and Si-deficiency on the slope break were apparently characteristics in summer. The concentration of phosphate was generally high and it was not possible to be a limiting-factor for the phytoplankton growth in the Bering Sea. N was limiting factor for the phytoplankton productivity in the most of continental shelf waters due to deficiency of DIN and low ratios of N/P in the surface waters, whereas Si-limitation was sporadic, only on the slope break during growth of diatom.
- nutrient,
- distribution features,
- nutrient condition,
- Bering Sea

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