瓦里关山大气CO本底变化

Background variation in atmospheric carbon monoxide at Mt. Waliguan, China

利用1992 01～2002 12期间的实测资料,分析了瓦里关全球基准站(36°17′N,100°54′E,海拔3816m)大气CO本底特征,并探讨了与源汇过程的关系.结果表明,瓦里关山大气CO体积分数本底范围与北半球平均水平基本相符,但增长趋势及年增长率波动与北半球平均状况并不完全一致,多年平均季节变化与同纬度海洋边界层(MBL)参比值以及北半球平均值也有较大差异,是所在地区多种CO源汇和大气输送共同作用的结果.瓦里关山大气CO本底观测资料既能体现亚洲内陆地域特点又具有全球代表性,辅以其它相关资料,还可进一步揭示中国内陆高原大气CO本底特征的成因.

By using observational data during the period of January 1992～December 2002 at Waliguan Observatory (36°17′N, 100°54′E, 3816m asl), characteristics of atmospheric CO background as well as potential relationship to sources and sinks, was studied. Results indicated that, the CO concentration distribution coincided with average of Northern Hemisphere. However, CO increase trend and growth rates fluctuation did not come up to the averages of the Northern Hemisphere. The CO average seasonal cycle has a notable discrepancy to the Marine Boundary Layer (MBL) reference at similar latitude band and the Northern Hemisphere average. The unique CO characteristics at Waliguan probably attributed to joint influence of multiple sources, sinks, as well as air mass transport from the surrounding areas. The CO observational data obtained at Waliguan possess Asian mainland behavior with global representativeness. It can further interpret the formation of CO background characteristics in the inland plateau of China and can provide other relevant information.