| 小浪底水库影响下的黄河花园口站和小浪底站pCO2特征及扩散通量 |
| 摘要点击 4561 全文点击 1898 投稿时间：2014-05-27 修订日期：2014-08-05 |
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| 中文关键词 黄河 二氧化碳分压 水-气CO2扩散通量 调水调沙 小浪底水库 |
| 英文关键词 Yellow River partial pressure of CO2(pCO2) air-water CO2 degassing fluxes runoff and sediment control Xiaolangdi Reservoir |
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| 中文摘要 |
| 于2011年11月至2012年10月在黄河小浪底站和花园口站进行连续采样分析,根据亨利定律计算出表层水体二氧化碳分压(pCO2),研究了在小浪底水库"水沙调控"的影响下黄河花园口站和小浪底站表层水体pCO2特征及水-气CO2通量. 结果表明,在小浪底水库正常调度期间,小浪底站表层水体ｐCO2在82~195 Pa之间,花园口站表层水体ｐCO2在99~228 Pa之间,且花园口站表层水体ｐCO2均高于同期的小浪底站; 在小浪底水库调水调沙期间,两个水文站均表现为水库泄水期间的表层水体pCO2明显低于水库排沙期间的表层水体pCO2. 无论是在小浪底水库正常调度期间还是在调水调沙期间,两个水文站表层水体pCO2均与DIC含量呈现显著的正相关关系. 8、9月EpCO2/AOU的比值高于生物好氧呼吸作用控制水体pCO2的理论下限0.62,因此8、9月生物好氧呼吸作用对水体pCO2的贡献比较明显. 从全年来看小浪底站和花园口站平均水-气CO2扩散通量分别为0.486μmol·(m2·s)-1和0.588 μmol·(m2·s)-1; 在水库正常调度期间花园口站水-气CO2扩散通量明显高于同期的小浪底站; 在小浪底水库调水调沙期间两个水文站均表现为水库泄水期间的水-气CO2扩散通量明显低于水库排沙期间的水-气CO2扩散通量. |
| 英文摘要 |
| According to periodic sampling analysis per month in Xiaolangdi station and Huayuankou station from November 2011 to October 2012, combined with continuous sampling analysis of Xiaolangdi Reservoir during runoff and sediment control period in 2012, partial pressure of CO2(pCO2) in surface water were calculated based on Henry's Law, pCO2 features and air-water CO2 degassing fluxes of Huayuankou station and Xiaolangdi station affected by Xiaolangdi Reservoir were studied. The results were listed as follows, when Xiaolangdi Reservoir operated normally, pCO2 in surface water of Xiaolangdi station and Huayuankou station varied from 82 to 195 Pa and from 99 to 228 Pa, moreover, pCO2 in surface water from July to September were distinctly higher than those in other months; meanwhile, pCO2 in surface water from Huayuankou station were higher than that from Xiaolangdi station. During runoff and sediment control period of Xiaolangdi Reservoir, two hydrological stations commonly indicated that pCO2 in surface water during water draining were obviously lower than those during sediment releasing. Whether in the period of normal operation or runoff and sediment control, pCO2 in surface water had positive relations to DIC content in two hydrological stations. Since the EpCO2/AOU value was higher than the theoretical value of 0.62, the biological aerobic respiration effect had distinct contribution to pCO2. Throughout the whole year, air-water CO2 degassing fluxes from Xiaolangdi station and Huayuankou station were 0.486 μmol·(m2·s)-1 and 0.588 μmol·(m2·s)-1 respectively; When Xiaolangdi Reservoir operated normally, air-water CO2 degassing fluxes in Huayuankou station were higher than that in Xiaolangdi station; during runoff and sediment control from Xiaolangdi Reservoir, two hydrological stations had one observation result in common, namely, air-water CO2 degassing fluxes in the period of water draining were obviously lower than that in the period of sediment releasing. |
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