Characteristics of carbonate system in the Hangzhou Bay: Under the regulation of air-sea exchange and respiration

Wang Junyang; Wang Bin; Li Dewang; Xu Zhongsheng; Miao Yanyi; Yang Zhi; Jin Haiyan; Chen Jianfang

doi:10.12284/hyxb2021124

Volume 43 Issue 9

Sep. 2021

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Wang Junyang，Wang Bin，Li Dewang, et al. Characteristics of carbonate system in the Hangzhou Bay: Under the regulation of air-sea exchange and respiration[J]. Haiyang Xuebao，2021, 43(9)：21–32 doi: 10.12284/hyxb2021124

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Characteristics of carbonate system in the Hangzhou Bay: Under the regulation of air-sea exchange and respiration

doi: 10.12284/hyxb2021124

Wang Junyang^{1, 2
,},
Wang Bin^{1, 2},
Li Dewang^{1, 2},
Xu Zhongsheng^{1, 2, 4},
Miao Yanyi^{1, 2, 5},
Yang Zhi^{1, 2},
Jin Haiyan^{1, 2, 3},
Chen Jianfang^{1, 2, 3
,
,}

1.
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
2.
Key Laboratory of Marine Ecosystem Dynamics, Ministry of Natural Resources, Hangzhou 310012, China
3.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
4.
Ocean College, Zhejiang University, Zhoushan 316021, China
5.
School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China

Received Date: 2021-01-29
Rev Recd Date: 2021-04-21

Available Online: 2021-06-11

Publish Date: 2021-09-25

Abstract

Abstract

As a typical high-turbidity bay, the carbonate systems in the Hangzhou Bay are not well documented. In this paper, the spatial distributions of inorganic carbonate paramenters in the Hangzhou Bay were analyzed based on data collected from two summer surveys in 2018 and 2019. The results showed that dissolved inorganic carbon (DIC) concentration and total alkalinity (TA) in surface layer of the Hangzhou Bay ranged from 1 553 μmol/kg to 1 964 μmol/kg and from 1 577 μmol/kg to 2 101 μmol/kg, respectively, which were lower than that of the Changjiang River Estuary (1 407−2 110 μmol/kg and 1 752−2 274 μmol/kg). The spatial distributions of DIC concentration and TA were controlled by the mixing of fresh water and offshore sea water. They were affected by strong tide, which gradually increased DIC concentration from inner bay to outlet of the bay. Air-sea carbon exchange and biological respiration led to decrease and increase of DIC concentration, with the contributions of (−42.3±11.7)% and (34.2±14.3)%, respectively. Such two compensate processes resulted in a net balanced state. The average surface pCO₂ in the Hangzhou Bay was 799 μatm (675−932 μatm), indicating that bay waters were source of atmospheric CO₂. The revelle factor in the Hangzhou Bay varied from 12.8 to 23.8, suggesting a weaker CO₂ buffering capacity than the adjacent East China Sea (the mean value was 11.9). Compared with other estuaries/gulfs, the characteristics of high turbidity and strong tides in the Hangzhou Bay made the spatial distributions of the carbonate system in the bay water had regional specificity.
- carbonate systems,
- dissolved inorganic carbon (DIC),
- distribution,
- Hangzhou Bay

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