华北地区兴隆站二氧化碳浓度观测（英文）

In-situ measurement of CO2 at the Xinglong regional background station over North China

基于兴隆站Picarro G2301观测资料,本文分析了2016年5月至2017年12月近地面二氧化碳浓度变化趋势以及远距离输送的影响。采用背景值筛选方法,提取了兴隆站二氧化碳背景浓度和污染浓度。分析表明,兴隆站二氧化碳背景浓度和污染浓度有相似的季节变化特征,夏季最低,冬季和早春较高。冬季和早春的高背景值主要由于正的生物通量,即更强的植物呼吸作用和更弱的植物光合作用;夏季则相反,夏季和初秋污染浓度与背景浓度差值均较大,主要是本地源排放增加,而72小时后向轨迹的聚类分析以及PSCF分析也表明,夏季由于来自北京,天津,河北和山东的气流输送,携带有高浓度二氧化碳气团也会使兴隆地区的二氧化碳污染浓度升高。远距离输送结果也表明,京津冀区域人为排放二氧化碳对兴隆地区四个季节的二氧化碳浓度均有正的贡献,冬季来自内蒙古和张家口的气团输送也会带来正的贡献。二氧化碳浓度的日变化在所有季节都很显著,10:00至14:00左右二氧化碳浓度较低。中午较强的边界层对流将高空低浓度的二氧化碳向下输送到近地面大气,下午则相反,而高值通常发生在夜间。

High-accuracy continuous measurements of atmospheric concentrations of CO2 were made from May 2016 to December 2017 using the Picarro G2301 analyzer at Xinglong station(40°24′N,117°30′E,940 MSL),150 km northeast of Beijing.The near-ground CO2 measurements were calibrated by standards based on WMO procedures.The regional background measurements were ltered by the robust extraction of baseline signal method to study the seasonal and diurnal cycles.The regional background CO2 concentrations were low in summer.The maximum diffierence between the local sources and regional background CO2 concentrations occurred in summer and autumn,indicating a strong in uence from local sources.Cluster analysis and potential source contribution function analysis showed that the long-distance transport of anthropogenic emissions in the Beijing Tianjin Hebei metropolitan area in uenced the CO2 concentrations in Xinglong,espe-cially in summer.The diurnal variation of CO2 was mainly in uenced by the various vertical transport conditions of the tropospheric atmosphere in a day.