地面风对瓦里关山大气CO_2本底浓度的影响分析

Impact of local surface wind on the atmospheric carbon dioxide background concentration at Mt.Waliguan

使用 1994年 7月— 2 0 0 0年 7月大气CO2 和地面风现场连续观测资料 ,分析了瓦里关全球大气本底基准站 (36°17′N ,10 0°5 4′E ,海拔 3816m)地面风变化对大气CO2 本底浓度的影响 .结果表明 ,水平风向、风速和垂直风向、风速的变化对大气CO2 观测值的影响在春、夏、秋、冬季有明显不同 .由大量观测事实的统计平均还给出了瓦里关山大气CO2 浓度在不同季节的分布范围和日变化类型 ,并分析了形成原因 .将地面风数据作为大气CO2 本底资料的过滤因子之一 ,提出了适用于不同使用目的和要求的我国内陆高原地区大气CO2

In combination with the partitioned continuous data sets of atmospheric CO\-2 and local surface wind corresponding to the different seasons from July 1994 to July 2000, the impact of surface wind system on the atmospheric CO\-2 background concentration at Mt.Waliguan (36°17′N,100°54′E,3816?m asl), one of the global atmospheric baseline monitoring stations in western China, was studied. The results indicated that the variabilities in the horizontal and vertical wind speed/direction over periods of different seasons has distinctly impact on the observed CO\-2 variation. Statistical analysis also interpreted the averaged CO\-2 distribution and its dinrual variation pattern in different seasons over the 6 years. By employing the local surface wind outcome as one of the data filters for the atmospheric CO\-2 observed concentrations at in\|land plateau of China, the selection procedures of background concentrations were provided for different purpose and requirements.