Hourly variations of partial pressure of CO<sub>2</sub> in surface sea water  and its controlling mechanisms in the northeastern Beibu Gulf in spring and summer

Xu Xin; Wang Xiang; Hu Huina; Xiang Rong; Cai Yucan; Liu Changjian; Zhang Weijie; Chen Jiyu; Ma Yu

doi:10.12284/hyxb2023052

Volume 45 Issue 3

Feb. 2023

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Xu Xin，Wang Xiang，Hu Huina, et al. Hourly variations of partial pressure of CO2 in surface sea water and its controlling mechanisms in the northeastern Beibu Gulf in spring and summer[J]. Haiyang Xuebao，2023, 45(3)：14–26 doi: 10.12284/hyxb2023052

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Xu Xin，Wang Xiang，Hu Huina, et al. Hourly variations of partial pressure of CO₂ in surface sea water and its controlling mechanisms in the northeastern Beibu Gulf in spring and summer[J]. Haiyang Xuebao，2023, 45(3)：14–26 doi: 10.12284/hyxb2023052

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Hourly variations of partial pressure of CO₂ in surface sea water and its controlling mechanisms in the northeastern Beibu Gulf in spring and summer

doi: 10.12284/hyxb2023052

Xu Xin^{1, 2
,},
Wang Xiang^{1, 2},
Hu Huina^{2, 3, 4},
Xiang Rong^{1, 2},
Cai Yucan^{1, 2},
Liu Changjian^{1, 2},
Zhang Weijie^{1, 2},
Chen Jiyu^{1, 2},
Ma Yu^{1, 2, 4
,
,}

1.
South China Sea Marine Survey Center, Ministry of Natural Resources, Guangzhou 510300, China
2.
Key Laboratory of Marine Environmental Survey Technology and Application, Ministry of Natural Resources, Guangzhou 510300, China
3.
South China Sea Environmental Monitoring Center, Ministry of Natural Resources, Guangzhou 510300, China
4.
Nansha Islands Coral Reef Ecosystem National Observation and Research Station, Hainan, Guangzhou 510300, China

Received Date: 2022-08-13
Rev Recd Date: 2022-10-25

Available Online: 2022-11-07

Publish Date: 2023-02-01

Abstract

Abstract

Diurnal observation is necessary for grasping the variability of carbonate system in coastal waters and sea-air CO₂ exchange process and is helpful to reduce the uncertainty of assessments for carbon source/sink. Surface carbonate system and related parameters were obtained during twice 24 hours fixed sampling and observation conducted in April and August 2018 in the Yingluo Bay-Anpu Harbor, located in the northeastern Beibu Gulf. In this paper, we analyzed the hourly variations of partial pressure of CO₂ in surface sea water (pCO₂) and discussed the corresponding environment factors controlling pCO₂ in both seasons. The pCO₂ values ranged from 530−628 μatm in spring to 427−748 μatm in summer, with the average sea-air CO₂ flux in spring and summer for (1.7±0.8) mmol/(m²·d) and (1.2±0.8) mmol/(m²·d), respectively. The study area acted as a weak CO₂ source during both seasons. The hourly changes of pCO₂ in spring were more significantly affected by temperature effects than in summer. During summertime, pCO₂ had more sensibly response to tidal action, enhanced biological production and respiration with inflow of coastal freshwater such as rivers and submarine groundwater discharge. Water warming dominated the formation of high pCO₂ in spring. The enhanced biological production during the physical mixing of saline and fresh water played a role in the drawdown of surface dissolved inorganic carbon (DIC) and the mangroves and salt marshes ecosystems along the bay had a certain contribution to the addition of DIC on the freshwater end-member in summer. The variations of the ratio of DIC concentration and total alkalinity (TA) in the water masses could imply the overall distribution pattern adjacent to the Yingluo Bay-Anpu Harbor that high values exists in the bay and lower values exists in offshore water.
- Beibu Gulf,
- Yingluo Bay-Anpu Harbor,
- partial pressure of CO₂,
- sea-air CO₂ flux

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References(52)

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