中文摘要：

利用基于光腔衰荡光谱（CRDS）技术自组装的大气CO在线观测系统,于2010年9月-2012年2月在浙江省临安大气本底站对大气CO进行了在线观测.结果表明临安站四季CO日变化明显受人为活动影响,分别在每日07：00-10：00和19：00-20：00出现峰值,夏季CO日平均浓度和振幅均最低,分别为314.3×10^-9±7.6×10^-9（摩尔分数,下同）和50.1×10^-9±47.9×10^-9.该站全年大气CO浓度呈现冬春季高、夏季低的趋势,与北半球瑞士Jungfraujoch站、青海瓦里关等站基本一致,但平均浓度明显高于其他国际站点,全年CO月均值振幅约为286.8×10^-9±19.2×10^-9.后向轨迹聚类和地面风结果分析表明,临安站非本底CO浓度主要来自于N-NNE-ENE扇区内城市及工业等人为排放所引起.春、夏和冬季最大的浓度抬升均出现在ENE风向,冬季抬升值最大,约为106.3×10^-9±58.0×10^-9.

英文摘要：

Background CO mole fractions were continuously measured at Lian＇an background station in Zhejiang province from September,2010 to February,2012 using Cavity Ring Down Spectroscopy（ CRDS） system. The diurnal variation of CO was strongly influenced by anthropogenic activities with two peaks occurring at 07： 00-10： 00 and 19： 00-20： 00（ local time）. The average daily mole fraction and amplitude in summer were the lowest among four seasons with values of 314. 3 ×10^-9 7. 6 ×10^-9 mole fraction,the same below） and 50. 1 ×10^-9 47. 9 ×10^-9respectively. The seasonal variations displayed peak values during winter-spring period and valley in summer,which roughly consisted with those observed variations at other sites located at northern hemisphere such as Jungfraujoch in Switzerland and Waliguan in China. However,the average mole fractions were much higher than those from other stations. The amplitude of monthly CO mole fractions was 286. 8 ×10^-9 19. 2 ×10^-9 The cluster analysis of backward trajectories and surface wind influence might suggest that the non-background CO mole fractions at Lin＇an station were mainly affected by the emissions from the megacities and industrial area on the N-NNE-ENE sectors. The maximum enhancements in spring,summer and winter all occurred on ENE sector,with a maximum value of 106. 3 ×10^-9 58. 0 ×10^-9n winter.