Seasonal variation of CO2 diffusion flux from a large subtropical reservoir in East China | |
Fushun Wang; Man Cao; Baoli Wang; Jianan Fu; Wenyun Luo; Jing Ma | |
2015 | |
发表期刊 | Atmospheric Environment
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卷号 | 103页码:129-137 |
摘要 | The Xinanjiang Reservoir (E118°42′–E118°59′, N29°28′–N29°58′), has a surface area of 567 km2, with a mean water depth of 34 m, and is in an oligotrophic state at present. In this study, five cruises were carried out in April, June, August and November 2010, and January 2011, to understand the seasonal variation of CO2emission and to estimate the annual diffusion flux of CO2 from this reservoir. The partial pressure of CO2 (pCO2) in surface water was determined using a continuous measurement system (equilibrator-infrared system) from upstream to central reservoir, and pCO2 along the water column in central reservoir and in downstream of the dam was also determined. Results showed that pCO2 in reservoir surface water varied significantly in different seasons, ranging from 5 μatm in August to 1700 μatm in January; while in downstream of the dam, it ranged from 1400 μatm in April to 3800 μatm in August. Along the water column in central reservoir, pCO2also showed significantly variations seasonally, and a water mass with quite high pCO2 (>4000 μatm) formed below water depth of 20 m in warm seasons. The highest diffusion flux of CO2 (F–CO2) appeared in January, with values of 20.9 mmol m−2 d−1at river reach and 25.2 mmol m−2 d−1 at central reservoir, while the lowest values of F–CO2 were −10.0 at river reach and −10.8 mmol m−2 d−1 at central reservoir in August. Downstream of the dam had quite high positive F–CO2 during the whole year, with a range of 129.1 in April to 381.5 mmol m−2 d−1 in August. In total, about 88.9 kton a−1 CO2 was emitted to the atmosphere from the Xinanjiang Reservoir surface, while 39% of it (35.1 kton a−1) was absorbed by surface water in warm seasons. Downstream and turbine had a comparable CO2 outgas flux of 61.5 kton a−1. When taking the whole reservoir surface, turbine and downstream into account, the Xinanjiang Reservoir system had a net CO2 emission flux of 115.3 kton a−1. |
关键词 | Co2 Diffusion Flux seasonal Patterns subtropical Reservoir the Xinanjiang Reservoir |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gyig.ac.cn/handle/42920512-1/9559 |
专题 | 环境地球化学国家重点实验室 |
作者单位 | 1.School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China 2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China |
推荐引用方式 GB/T 7714 | Fushun Wang;Man Cao;Baoli Wang;Jianan Fu;Wenyun Luo;Jing Ma. Seasonal variation of CO2 diffusion flux from a large subtropical reservoir in East China[J]. Atmospheric Environment,2015,103:129-137. |
APA | Fushun Wang;Man Cao;Baoli Wang;Jianan Fu;Wenyun Luo;Jing Ma.(2015).Seasonal variation of CO2 diffusion flux from a large subtropical reservoir in East China.Atmospheric Environment,103,129-137. |
MLA | Fushun Wang;Man Cao;Baoli Wang;Jianan Fu;Wenyun Luo;Jing Ma."Seasonal variation of CO2 diffusion flux from a large subtropical reservoir in East China".Atmospheric Environment 103(2015):129-137. |
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