Estimates of the Chemical Budget for Ozone at Waliguan Observatory

摘要: Waliguan Observatory (WO) is an in-land Global Atmosphere Watch (GAW) baseline station on the Tibetan plateau. In addition to routine GAW measurement program at WO, measurements of trace gases, especially ozone precursors, were made for some periods from 1994 1996. The chemical budget WO was estimated using a box model constrained by these measured gas concentrations and meteorological variables. Air masses are usually affected boundary layer (BL) in daytime associated with upslope flow, while it free troposphere (FT) night downslope flow. An anti-relationship between water vapor found investigating average diurnal cycle pattern under clear sky conditions. This relationship implies that air have both FT BL characteristics. Model simulations carried out conditions January July 1996, respectively. characteristics mixed (MC) tropospheric investigated. effects variation NOx evaluated considered time. It shown net produced destroyed MC WO. production rate –0.1 0.4 ppbv day−1 January, 0.0 1.0 –4.9 –0.2 July, –5.1 2.1 July.