Planar optode observation method for the effect of raindrop on dissolved oxygen and pH diffusion of air-water interface

Jiang Zike; Yu Xinsheng; Jin Weiwei

doi:10.3969/j.issn.0253-4193.2018.07.011

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Jiang Zike, Yu Xinsheng, Jin Weiwei. Planar optode observation method for the effect of raindrop on dissolved oxygen and pH diffusion of air-water interface[J]. Haiyang Xuebao, 2018, 40(7): 134-142. doi: 10.3969/j.issn.0253-4193.2018.07.011

Citation:

Jiang Zike, Yu Xinsheng, Jin Weiwei. Planar optode observation method for the effect of raindrop on dissolved oxygen and pH diffusion of air-water interface[J]. Haiyang Xuebao, 2018, 40(7): 134-142. doi: 10.3969/j.issn.0253-4193.2018.07.011

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Planar optode observation method for the effect of raindrop on dissolved oxygen and pH diffusion of air-water interface

doi: 10.3969/j.issn.0253-4193.2018.07.011

1.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Qingdao 266100, China
2.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Qingdao 266100, China;Qingdao National Laboratory for Marine Science and Technology, Qingdao 266100, China
3.
China Offshore Environmental Services Ltd., Tianjin 300452, China

Received Date: 2017-03-14
Rev Recd Date: 2018-03-13

Abstract

Abstract

The air water interface is an important interface where material exchanges, it has important influence on ecosystem and biogeochemical cycle. The rain can change the balance of interface, improve the exchange rate of gas flux, and make the distribution of dissolved oxygen and pH of the interface change in horizontal and vertical direction. Based on planar sensing film with highly spatial and temporal resolution, which can provide the characteristics of two-dimensional distribution information, we carry out the simulation experiment of raindrops about oxygen and pH distribution in air-water interface by using double parameters planar optode. The results show that rainfall process plays an important role in adjusting dissolved oxygen and pH of the surface water, the raindrop can break the balance of micro surface of water-gas interface mechanism, and promote the dissolution of oxygen in the atmosphere in water to make a average increase of about 2.3 mg/L in vertical direction 23 mm. The impact of rainfall on pH of the water surface within 12 mm is relatively obvious, the pH value decreased by an average of 0.2-0.4 units, indicating that the raindrop promoted the migration of the atmosphere in the air-water interface, and the dissolved CO₂ caused the surface water acidification. This study provides a new technical method for understanding the influence of raindrops on the dissolved oxygen concentration and pH of the surface water in low wind impacting area and static water area.
- air-water interface,
- rain drops,
- dissolved oxygen,
- pH diffusion,
- planar optode

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