The determination of a "regional" atmospheric background mixing ratio for anthropogenic greenhouse gases: A comparison of two independent methods

摘要: Halocarbons are powerful greenhouse gases capable of significantly influencing the radiative forcing Earth’s atmosphere. monitored in several stations which globally distributed order to assess long term atmospheric trends and identify source regions. However, achieve these aims definition background mixing ratios, i.e. ratio a given air mass when recent contribution local sources is absent, necessary. This task can be accomplished using different methods. paper presents statistical methodology that has been devised specifically for mountain site located Continental Europe (Monte Cimone, Italy), characterised by vicinity strong sources. The method involves decomposition observed data distribution into Gaussian distribution, representative values, Gamma ascribable from stronger applied time series European marine remote station (Mace Head, Ireland) as well Monte Cimone. A comparison described this with well-established meteorological filtering procedure at Mace Head shown an excellent agreement. baselines Mt. Cimone Swiss alpine Jungfraujoch highlighted occurrence specific concentration. Although application three hydrofluorocarbons, proposed extended any lived component available location even if affected