CAJ | 학술논문

利用美国DMT公司生产的连续气流单过饱和度云凝结核计数器对华北部分地区地面和空中云凝结核（CCN）进行了观测研究。地面观测结果表明，太原由于污染严重CCN数浓度高于石家庄。CCN数浓度日最大值、日平均值均随过饱和度的增加而增大。CCN数浓度具有明显的日变化特征，与气象因子、人类活动有关。降水对地面CCN具有明显的冲刷作用。利用关系式N=CSk拟合太原地面CCN活化谱，C〉2200cm-3，k〈l，C、k值很高，属于典型的大陆型核谱。飞机观测资料显示，CCN主要来源于地面，数浓度随高度增加明显减少。高空风向发生变化时，长距离气团输送提供CCN二次源。云对CCN有消耗作用，云内CCN比云外明显减少。
이용미국DMT공사생산적련속기류단과포화도운응결핵계수기대화북부분지구지면화공중운응결핵（CCN）진행료관측연구。지면관측결과표명，태원유우오염엄중CCN수농도고우석가장。CCN수농도일최대치、일평균치균수과포화도적증가이증대。CCN수농도구유명현적일변화특정，여기상인자、인류활동유관。강수대지면CCN구유명현적충쇄작용。이용관계식N=CSk의합태원지면CCN활화보，C〉2200cm-3，k〈l，C、k치흔고，속우전형적대륙형핵보。비궤관측자료현시，CCN주요래원우지면，수농도수고도증가명현감소。고공풍향발생변화시，장거리기단수송제공CCN이차원。운대CCN유소모작용，운내CCN비운외명현감소。
Using a DMT( Droplet Measurement Technologies) continuous flow streamwise thermal gra- dient cloud condensation nuclei (CCN) counter, the aircraft and ground measurements of CCN over some regions of North China are conducted. The field observations show that, due to the severe air pol- lution, CCN number concentration in Taiyuan city is higher than that in Shijiazhuang city. Daily mean and maximum CCN number concentrations increase with the supersaturation. With the influence of me- teorological factors and human activities, the variations of CCN number concentration display a distinc- tive diurnal cycle including two apparent peaks. Precipitation has an obvious scavenging effect on the ground CCN. The ground CCN spectra can be derived from the expression N = CSk. The fitting spectra parameters C(more than 2 200 cm-3) and k( less than 1 ) represent the continental characteristic of CCN in Taiyuan city. The CCN is mainly transported from surface and CCN number concentration de- creases with the height. Long-distance transportation of particles provides secondary source for CCN when the upper wind direction changes. The cloud has a definite depletion effect on CCN particles so that CCN decreases obviously in clouds.