Objective Most scholars agreed that the tectonic setting of South China block(SBC)changed from Tethys during the Indosinian to Pacific tectonic regime in the Yanshanian.However,the specific change time for the trans...Objective Most scholars agreed that the tectonic setting of South China block(SBC)changed from Tethys during the Indosinian to Pacific tectonic regime in the Yanshanian.However,the specific change time for the transition is still in debate and the Triassic to Jurassic magmatic activity will provide a clue to better understanding the transition.展开更多
选取梅州为粤东北地区代表城市,使用高阶去耦合直接法(High-order Decoupled Direct Method,HDDM)开展臭氧与前体物关系研究。一阶敏感性系数表明,在夏季,减少省外VOCs或NOx排放对梅州的臭氧污染控制都有利,梅州本地VOC排放的减少有利...选取梅州为粤东北地区代表城市,使用高阶去耦合直接法(High-order Decoupled Direct Method,HDDM)开展臭氧与前体物关系研究。一阶敏感性系数表明,在夏季,减少省外VOCs或NOx排放对梅州的臭氧污染控制都有利,梅州本地VOC排放的减少有利于降低臭氧浓度,但NOx的减排反而会加重臭氧污染水平,而省内其它城市排放的变化在大部分时候对梅州影响轻微。秋季,梅州本地的排放对梅州的臭氧影响最大,其次是外省的排放,广东省其它城市的影响轻微,减少省外或梅州市本地VOCs排放对梅州的臭氧污染控制都有利,省外NOx排放的减少在个别时候有利于降低臭氧浓度,个别时候会加重梅州臭氧污染,但梅州本地NOx的减排会加重臭氧污染水平。考虑二阶敏感性系数的臭氧与前体物排放变化曲线表明,粤东北地区的臭氧与外省前体物的排放或广东省其它城市前体物的排放呈现出高度的非线性关系。而梅州本地臭氧前体物的排放变化与臭氧浓度变化的关系较为线性。建议粤东北地区尽可能减少本地排放的VOCs以减轻臭氧的污染水平。展开更多
基金supported by the National Key Research and Development Program of China(grant No.2016YFC0600205)the Geological Survey program of China Geological Survey(grant No.DD20160134,DD20160033)
文摘Objective Most scholars agreed that the tectonic setting of South China block(SBC)changed from Tethys during the Indosinian to Pacific tectonic regime in the Yanshanian.However,the specific change time for the transition is still in debate and the Triassic to Jurassic magmatic activity will provide a clue to better understanding the transition.
文摘选取梅州为粤东北地区代表城市,使用高阶去耦合直接法(High-order Decoupled Direct Method,HDDM)开展臭氧与前体物关系研究。一阶敏感性系数表明,在夏季,减少省外VOCs或NOx排放对梅州的臭氧污染控制都有利,梅州本地VOC排放的减少有利于降低臭氧浓度,但NOx的减排反而会加重臭氧污染水平,而省内其它城市排放的变化在大部分时候对梅州影响轻微。秋季,梅州本地的排放对梅州的臭氧影响最大,其次是外省的排放,广东省其它城市的影响轻微,减少省外或梅州市本地VOCs排放对梅州的臭氧污染控制都有利,省外NOx排放的减少在个别时候有利于降低臭氧浓度,个别时候会加重梅州臭氧污染,但梅州本地NOx的减排会加重臭氧污染水平。考虑二阶敏感性系数的臭氧与前体物排放变化曲线表明,粤东北地区的臭氧与外省前体物的排放或广东省其它城市前体物的排放呈现出高度的非线性关系。而梅州本地臭氧前体物的排放变化与臭氧浓度变化的关系较为线性。建议粤东北地区尽可能减少本地排放的VOCs以减轻臭氧的污染水平。