The weekly averages of near-surface Be-7, Pb-210, O-3, and CO2 concentrations at the Global Atmospheric Watch Observatory, Mt. Waliguan (101.98A degrees E, 36.287A degrees N, 3810 m a.s.l.), from October 2002 to January 2004 are presented. With the establishment of the new datasets of DCCW (Differential Concentrations in Contiguous Weeks) of Be-7, Pb-210, and O-3, CO2 (Delta Be-7, Delta Pb-210, Delta O-3, Delta CO2, respectively, the impacts of upper-level downward transports and land-surface emissions on O-3 and CO2 concentrations are implied by Be-7 and Pb-210 being as independent tracers. The relations among Delta Be-7, Delta Pb-210, and Delta O-3, Delta CO2 are examined statistically and compared. The results indicate that with the DCCWs, the interferences with the tracing significance of Be-7 and Pb-210 from the seasonal wet scavenging of atmospheric aerosol are greatly reduced, and the weighting sources of O-3 or CO2 variations are more pronounced. Basically, the variability of surface O-3 is controlled predominately by air mass transported from the upper atmosphere levels while the emission from the Continent Boundary Layer (CBL) has an obvious input for CO2. The relation between Delta Pb-210 and Delta O-3 reflects that influences of CBL emission are generally positive/negative for surface O-3 budget in summer/winter, and the relation of Delta Be-7 and Delta CO2 also reveals that upper level downward transport has positive/negative inputs for CO2 in summer/winter. With the highly correlated relations between Be-7 and O-3, a quantitative estimation is made of the stratospheric contributions to the budget of surface O-3 at WLG: the monthly averages of stratospheric O-3 range from 6 x 10(-9) to 8 x 10(-9) (volume mixing ratio) in April and from June to August, and 2x10(-9) to 4x10(-9) in the remaining months. For the ultimate sources of the baseline concentration of surface O3, which consist of only stratospheric transport and tropospheric photochemistry production, the contribution from stratospheric transport is estimated to be about 20 x 10(-9) from May to July, and (12-15)x10(-9) in the remaining months, and the total relative contribution rate is about 35% to 40%.