Estimation of nutrients flux of water-sediment interface in the Chukchi Sea,the western Arctic Ocean

Zhang Haizhou; Zhuang Yanpei; Zhu Qingmei; Li Hongliang; Liu Xiaoya; Chen Fajin; Lu Yong; Chen Jianfang

doi:10.3969/j.issn.0253-4193.2015.11.015

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Zhang Haizhou, Zhuang Yanpei, Zhu Qingmei, Li Hongliang, Liu Xiaoya, Chen Fajin, Lu Yong, Chen Jianfang. Estimation of nutrients flux of water-sediment interface in the Chukchi Sea,the western Arctic Ocean[J]. Haiyang Xuebao, 2015, 37(11): 155-164. doi: 10.3969/j.issn.0253-4193.2015.11.015

Citation:

Zhang Haizhou, Zhuang Yanpei, Zhu Qingmei, Li Hongliang, Liu Xiaoya, Chen Fajin, Lu Yong, Chen Jianfang. Estimation of nutrients flux of water-sediment interface in the Chukchi Sea,the western Arctic Ocean[J]. Haiyang Xuebao, 2015, 37(11): 155-164. doi: 10.3969/j.issn.0253-4193.2015.11.015

Citation:

Zhang Haizhou, Zhuang Yanpei, Zhu Qingmei, Li Hongliang, Liu Xiaoya, Chen Fajin, Lu Yong, Chen Jianfang. Estimation of nutrients flux of water-sediment interface in the Chukchi Sea,the western Arctic Ocean[J]. Haiyang Xuebao, 2015, 37(11): 155-164. doi: 10.3969/j.issn.0253-4193.2015.11.015

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Estimation of nutrients flux of water-sediment interface in the Chukchi Sea,the western Arctic Ocean

doi: 10.3969/j.issn.0253-4193.2015.11.015

1.
Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanologica Administion, Hangzhou 310012, China
2.
Guangdong Province Key Laboratory of Coastal Ocean Variation Disaster Prediction Technologies, Guangdong Ocean University, Zhanjiang 524088, China

Received Date: 2015-04-09

Abstract

Abstract

Nutrients regeneration in pore water is one of the important ways to supply nutrients of upper water column in the shelf. The pore water in sediment of the central Chukchi Sea continental shelf, showed a typical benthic distribution of nutrients at water-sediment interface, in where physical and bioturbation was weak. The nutrient samples in multi-tubular short column sediment and water column were obtained from the Forth Chinese National Arctic Research Expedition, to measure the nutrient concentrations of pore water, overlying water and water column. The results show that, the typical distribution can be separated into three layers. The first layer is the exponential increasing layer (I), in which the concentrations of nutrients increased rapidly with depth. Then was the steady layer (Ⅱ), the sediment demineralization was equal to the nutrient transference and nutrients' concentrations were substantially constant at this stage. The third layer was a slowly descending layer (Ⅲ), in which NO₃^- and PO₄^3- were reduced by bacteria and lost oxygen ions due to organic materials degradation depleting oxygen. By a two-layer mode and the Fick's first law of diffusion, diffusive fluxes of silicate, phosphate and nitrate in R06 station of the Chukchi Sea shelf can be calculated, and the fluxes were 1.660 mmol/(m²·d), 0.008 mmol/(m²·d) and 0.117 mmol/(m²·d), respectively. The diffusive fluxes of silicate for CC1, R06, C07 and S23 stations were 3.101 mmol/(m²·d), 1.660 mmol/(m²·d), 1.307 mmol/(m²·d) and 0.243 mmol/(m²·d), respectively, which show obvious distribution characteristics with latitude. Distribution of N^* in the pore water suggested that a strong denitrification process in sedimentary environment of the Chukchi Sea shelf, which is an important sink for nitrate.
- biogenic silica,
- water-sediment interface,
- transport flux,
- Chukchi Sea

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