Regulation of phytoplankton distribution by characteristic water masses in the northern Chukchi Sea, Arctic

Fei Shuyi; Li Ji; Gao Yuan; Ge Yuehao; Guo Zhengdong; Gao Yonghui

doi:10.12284/hyxb2023016

Volume 45 Issue 1

Jan. 2023

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Fei Shuyi，Li Ji，Gao Yuan, et al. Regulation of phytoplankton distribution by characteristic water masses in the northern Chukchi Sea, Arctic[J]. Haiyang Xuebao，2023, 45(1)：114–124 doi: 10.12284/hyxb2023016

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Regulation of phytoplankton distribution by characteristic water masses in the northern Chukchi Sea, Arctic

doi: 10.12284/hyxb2023016

Fei Shuyi^1
,,
Li Ji^{1, 2, 3},
Gao Yuan²,
Ge Yuehao⁴,
Guo Zhengdong⁵,
Gao Yonghui^{1, 2, 3
,
,}

1.
School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China
2.
Key Laboratory for Polar Science, Ministuy of Natural Resources, Polar Research Institute of China, Shanghai 200136, China
3.
Shanghai Key Laboratory of Polar Life and Environment Sciences, School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China
4.
Nantong Marine Environmental Monitoring Center, State Oceanic Administration, Nantong 226002, China
5.
PLA Naval Submarine Academy, Qingdao 266199, China

Received Date: 2022-05-13
Rev Recd Date: 2022-08-16

Available Online: 2022-08-30

Publish Date: 2023-01-09

Abstract

Abstract

Based on ecological observations of the northern Chukchi Sea and the western Canada Basin junction zore, We found that within the upper 150 m, the phytoplankton distribution was complicated by dominant water masses: the Melting Water (MW), the Alaskan Coastal Water (ACW) transported with the Beaufort Gyre (BG), and summer Bering Sea Water (sBSW). The changes of temperature and nutrients were closely related to water mass, and the physical-biochemical coupling effect further affects the distribution and community structure of phytoplankton. The Chl a maximum concentration layer often existed in the dim water of about 50 m depth. In the nutrient-rich sBSW and ACW dominant water-mass, phytoplankton were dominant by netplankton (74% of the total Chl a concentration) and picoplankton (65% of the total Chl a concentration). In the early stage of bloom, dissolved inorganic nitrogen (DIN) was relative limited to phosphate, while bioavailable nitrogen was still above the absolute limit threshold. The DIN-Salinity conservative mixing model showed that phytoplankton significantly removed nitrogen, and the nitrogen-uptake was positively related to Chl a concentration. The amount of nitrogen uptake in ACW water mass with slightly higher temperature was higher than that in sBSW water mass. In response to Arctic warming, the enhanced Beaufort Gyre, and nutrient supply from ACW and sBSW, Chl a concentration of phytoplankton in this region (ranged from 0.04−0.69 mg/m³ with an average of (0.327±0.163) mg/m³) were higher than the historical observations. This will increase the carbon absorption flux in the Arctic sea area, which is conducive to its development as a carbon sink area.
- Chukchi Sea,
- Beaufort Gyre,
- size-fractionated Chl a,
- temperature,
- water masses

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References(41)

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