PRELIMINARY ANALYSIS AND COMPARISON OF RESULT IN FIELD EXPERIMENT OF SINO-US ATNOSPHERIC CHENICAL COOPERATION INVESTIGATION (PEN-WEST-B)

A ccording to measurement result at Linan,we can address some conclusions.The O3 and its precursor NOx concent rations are higher in autumn and spring in middle latitude of China.Such higher O3 has an adverse effect on crops and economics system.O3 concent ration in boundary layer is determined by photochemical process controlled by surface global radiation.There is an obviously non-linear relationship between O3 and NOx.The data taken from period of PEM-WEST-A and B 1995 shows that:The production efficiency of O3 decrease with NOx concentration increasing.Althouht the efficiency of O3 production in autumn is higher than that in winter,because of the higher NOx in autumn limited (HO2) production,so the accumulated O3 concent ration in winter almost is comparable with that of in autumn.The ratio of NMHC to NOx at Linan is higher than that at abroad similar latitude.It seems that O3 photo chemical production may be comtroled by NOx at Linan in these seasons.(There for it prompts that because of the NMHC produced by nature resources is higher,so if we want to control O3 concentration,we should contrlo NOx discharge).The average SO2 concentration at Kangting in Taiwan is 0.29 ppb during PEM-WEST-B.The SO2 concent ration at Linan is 50 times higher than that at Kang ting during PEM-WEST-Bin 1994.This value maybe the representive of background SO2 at island in low latitude.It is clearly that the humanaction effect so bviously on the value of at mospheric background.