Distribution,flux and biological consumption of carbon monoxide in the East China Sea in summer

Xu Guanqiu; Lu Xiaolan; Yang Guipeng; Zhao Baozhen

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Xu Guanqiu, Lu Xiaolan, Yang Guipeng, Zhao Baozhen. Distribution,flux and biological consumption of carbon monoxide in the East China Sea in summer[J]. Haiyang Xuebao, 2014, 36(6): 25-32.

Citation:

Xu Guanqiu, Lu Xiaolan, Yang Guipeng, Zhao Baozhen. Distribution,flux and biological consumption of carbon monoxide in the East China Sea in summer[J]. Haiyang Xuebao, 2014, 36(6): 25-32.

Xu Guanqiu, Lu Xiaolan, Yang Guipeng, Zhao Baozhen. Distribution,flux and biological consumption of carbon monoxide in the East China Sea in summer[J]. Haiyang Xuebao, 2014, 36(6): 25-32.

Citation:

Xu Guanqiu, Lu Xiaolan, Yang Guipeng, Zhao Baozhen. Distribution,flux and biological consumption of carbon monoxide in the East China Sea in summer[J]. Haiyang Xuebao, 2014, 36(6): 25-32.

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Distribution,flux and biological consumption of carbon monoxide in the East China Sea in summer

College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

Received Date: 2013-09-16

Abstract

Abstract

Carbon monoxide (CO) concentration distribution,sea-to-air flux and microbial consumption rate constants,along with atmospheric CO mixing ratios,were measured in the East China Sea in summer. Atmospheric CO mixing ratios varied from 63°10^-9 to 120°10^-9,with an average of 87°10^-9 (SD=18°10^-9,n=37). Overall,the concentrations of atmospheric CO displayed a decreasing trend from the coastal stations to the offshore stations and a decreasing trend from the northern stations to the southern stations. The surface water CO concentrations in the investigated area ranged from 0.24 to 5.51 nmol/L,with an average of 1.48 nmol/L (SD=1.46,n=37). The surface water CO concentrations were affected significantly by sunlight. Vertical profiles showed that CO concentrations declined with depth rapidly,with the maximum values appearing in the surface water. The surface CO concentrations were oversaturated and the saturation factors ranged from 3.65 to 113.55,with an average of 23.63 (SD=24.56,n=37). The East China Sea was a net source of atmospheric CO. The sea-to-air fluxes of CO in the East China Sea ranged from 0.25 to 78.50 μmol/(m²·d),with an average of 9.97 μmol/(m²·d) (SD=14.92,n=37). In the incubation experiments,CO concentrations decreased exponentially with incubation time and the processes conformed to the first order reaction characteristics. The microbial CO consumption rate constants in the surface water (K_CO) ranged from 0.043 to 0.32 h^-1,with an average of 0.18 h^-1 (SD=0.088,n=9). A negative correlation between K_CO and salinity was observed in the present study.
- carbon monoxide,
- distribution,
- sea-to-air flux,
- microbial consumption,
- East China Sea

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