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A field survey was conducted in the East China Sea in autumn 2023 to study the distributions of carbon monoxide (CO) concentration, estimate the sea-to-air fluxes, and measure the microbial consumption and dark production rates of CO in the surface seawater. The results showed that atmospheric CO mixing ratios of the East China Sea ranged from 61.15 to 234.26 ppbv, with an average of (98.47 ± 49.64) ppbv. A headspace analysis system was used to determine CO. The concentrations of CO in the surface seawater ranged from 0.20 to 1.63 nmol/L, with an average of (0.63 ± 0.71) nmol/L. The CO concentrations exhibited noticeable daily variations across different water layers, with a maximum at noon and a minimum around dawn. The results of vertical distributions showed that the CO concentrations decreased gradually with the increase of depth. The sea-to-air fluxes of CO ranged from 0.45 to 5.66μmol/(m2·d), with an average of (2.11 ± 2.89) μmol/(m2·d). The results of sea-to-air fluxes estimation showed that the East China Sea was a source of atmospheric CO. The microbial consumption rate constants of CO in the surface seawater ranged from 0.16 to 0.33/h, with an average of (0.22 ± 0.07)/h. The consumption process showed the characteristics of first-order reaction. Dark production rates varied from 0.023 to 0.20nmol/(L·h), with an average of (0.12 ± 0.14) nmol/(L·h). The concentrations of CO increased linearly with the increase of time. This survey complements the source-sink processes of CO in the East China Sea, and contributes to a further understanding of the CO biogeochemical processes and its climatic effect in the continental shelf sea area.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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