CAJ | 학술논문

利用1961-2006年的常规气象资料分析了兰州市霾日的气候特征.研究表明20世纪70,80年代兰州市霾日发生较频繁,但整体呈减少趋势,尤其90年代开始大幅下降;兰州的霾日一年内各季均有发生,但主要发生在秋末和冬季,12月份最多,强度最强的霾日也集中在冬季;时次分布上春、夏季8:00出现霾日最多,而秋、冬季14:00最多;一年中霾日数成"U"型分布,与地表气温呈负相关,气温越低,霾日出现的概率越高;风速小于2m/s和日平均相对湿度低于70%也是霾发生的主要气象条件之一.
이용1961-2006년적상규기상자료분석료란주시매일적기후특정.연구표명20세기70,80년대란주시매일발생교빈번,단정체정감소추세,우기90년대개시대폭하강;란주적매일일년내각계균유발생,단주요발생재추말화동계,12월빈최다,강도최강적매일야집중재동계;시차분포상춘、하계8:00출현매일최다,이추、동계14:00최다;일년중매일수성"U"형분포,여지표기온정부상관,기온월저,매일출현적개솔월고;풍속소우2m/s화일평균상대습도저우70%야시매발생적주요기상조건지일.
Climate characteristics of haze were analyzed by using conventional meteorological data from 1961 to 2006 in Lanzhou City. Due to severe pollution, haze in Lanzhou frequently occurred during 1970's to 1980's. However, the hazy days in total were decreasing in 1990's and at the turn of the century. Haze occurred in the four seasons of any year throughout the history but mostly in late autumn and the whole winter. Of twelve months, the maximum days of haze occurrence are in December and the most strong are also in winter. As for a daily distribution, the great part of haze appear at 8:00 in spring and summer,14:00 in autumn and winter. In a year, the variations of haze days display a "U" type, which has negative correlation with temperature. According to statistic results, the lower the surface temperature is, the more likely that haze occurs. The wind speed below 2 m/s and relative humidity under 70% are two major weather conditions causing haze occurrence.