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 u...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.展开更多
A simulated study of mechanism for variations and distributions of ozone and its precursors was made by using the three-dimensional regional Eulerian model.The results showed that the ozone production was controlled b...A simulated study of mechanism for variations and distributions of ozone and its precursors was made by using the three-dimensional regional Eulerian model.The results showed that the ozone production was controlled by NO,but there is a complicated nonlinear relation between them.The photochemical reactions controlled by solar radiation are the determinative factors affecting the variations of the surface ozone and its precursors.The relations of ozone and CO, PAN were studied.We compared the simulated and observed results during the PEM-WEST A in order to better under- stand the photochemical processes of ozone and its precursors.展开更多
文摘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.
基金This work is partly supported by the National Natural Science Foundation of China.
文摘A simulated study of mechanism for variations and distributions of ozone and its precursors was made by using the three-dimensional regional Eulerian model.The results showed that the ozone production was controlled by NO,but there is a complicated nonlinear relation between them.The photochemical reactions controlled by solar radiation are the determinative factors affecting the variations of the surface ozone and its precursors.The relations of ozone and CO, PAN were studied.We compared the simulated and observed results during the PEM-WEST A in order to better under- stand the photochemical processes of ozone and its precursors.
