| 三峡库区库中干流及支流水体夏季二氧化碳分压及扩散通量 |
| 摘要点击 4743 全文点击 2389 投稿时间：2013-07-01 修订日期：2013-09-09 |
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| 中文关键词 温室气体 二氧化碳分压 二氧化碳通量 三峡库区 梅溪河 |
| 英文关键词 greenhouse gas partial pressure of carbon dioxide diffusion flux of carbon dioxide the Three Gorges Reservoir Meixi River |
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| 中文摘要 |
| 以三峡库区库中干流以及主要支流——梅溪河为研究区，于 2013年 5月对该区域水体中溶解二氧化碳分压 （pCO2）进行了走航观测. 结果表明，夏季梅溪河表层 pCO2为 6.8~7.5 Pa，三峡库区库中长江干流表层 pCO2为 201.4~ 210.2 Pa. 在库区干、支流交汇的过渡区水体剖面上，表层水体 pCO2最低为 53.5 Pa，随着水深增加，pCO2急剧增大，在 3 m处达到约 210 Pa后基本保持不变. 通过计算，库区支流梅溪河和库区干流表层水体的 CO2释放通量分别为 -7.48 mmol·（m2·d）-1和 39.58 mmol·（m2·d）-1. 结果表明，库区支流梅溪河表现为大气中 CO2的“汇”，而库区干流表现为 CO2的“源”，库区干、支流水体在 CO2的释放上有显著差异. |
| 英文摘要 |
| This study investigated the partial pressure of CO2 (pCO2) in the mainstream of the Three Gorges Reservoir and its tributary (Meixi River) in May 2013. Results showed that pCO2 in the surface water of the Meixi River and mainstream of the Three Gorges Reservoir was 6.8-7.5 Pa and 201.4-210.2 Pa, respectively. At the mixing area between the Meixi River and the mainstream of Changjiang, the lowest value of pCO2 in surface water was 53.5 Pa, and pCO2 gradually increased downwardly. Below 3 m in depth, pCO2 kept the stable value of around 210 Pa. Based on the calculation results, the emission flux of CO2 in the Meixi River and the mainstream of the central Three Gorges Reservoir was about -7.48 mmol·(m2·d)-1 and 39.58 mmol·(m2·d)-1, respectively. These results showed that the Meixi River is a sink for atmospheric CO2, and the mainstream of the Three Gorges Reservoir is a source for atmospheric CO2. |
