摘要
Measurements of NO_x(NO+NO_2),HNO_3,particulate nitrate,and total odd nitrogen NO_y were made at Lin atmosphere regional background station during the NASA GTE/PEM-WEST A in the fall of 1991.NO_x and N were measured using chemiluminescence detectors.HNO_3 and aerosol nitrate(NO_3^-)were collected by a filter syst NO_x concentration exhibits a significant diurnal variation:maximum occurring in the evening and postsunrise w peak occurring following sunrise.Unlike NO_x,NO_y does not show distinct diurnal variations.From the ratios day/night NO_x concentration and the diurnal cycles of two kinds of weather conditions,it is clear that photochemical production of NO_x varies with solar radiation.NO_x is the major component of total odd nitro NO_y and NO_2 is the major portion of NO_x as well.The regional background concentrations of NO_x,NO_y,aerosol trate(NO_3^-)and HNO_3 range from 4.77 to 7.02 ppb,9.24 to 10.95 ppb,0.33 to 2.38 ppb and 0.31 to 0.97 ppb in a day average,respectively.In the eastern China,the biomass burning is an important local emission source of nitro species.The ratios of NO/NO_2,NO_x/NO_y,HNO_3/NO_y,NO_3^-/NO_y and HNO_3/NO_x are also discussed in paper.
Measurements of NO_x(NO+NO_2),HNO_3,particulate nitrate,and total odd nitrogen NO_y were made at Lin atmosphere regional background station during the NASA GTE/PEM-WEST A in the fall of 1991.NO_x and N were measured using chemiluminescence detectors.HNO_3 and aerosol nitrate(NO_3^-)were collected by a filter syst NO_x concentration exhibits a significant diurnal variation:maximum occurring in the evening and postsunrise w peak occurring following sunrise.Unlike NO_x,NO_y does not show distinct diurnal variations.From the ratios day/night NO_x concentration and the diurnal cycles of two kinds of weather conditions,it is clear that photochemical production of NO_x varies with solar radiation.NO_x is the major component of total odd nitro NO_y and NO_2 is the major portion of NO_x as well.The regional background concentrations of NO_x,NO_y,aerosol trate(NO_3^-)and HNO_3 range from 4.77 to 7.02 ppb,9.24 to 10.95 ppb,0.33 to 2.38 ppb and 0.31 to 0.97 ppb in a day average,respectively.In the eastern China,the biomass burning is an important local emission source of nitro species.The ratios of NO/NO_2,NO_x/NO_y,HNO_3/NO_y,NO_3^-/NO_y and HNO_3/NO_x are also discussed in paper.
