CAJ | 학술논문

利用2010年10~11月CE318太阳光度计观测资料,得出了北京市秋季气溶胶光学厚度(AODλ=500nm),Angstr?m波长指数(α)和浑浊度(β).结果显示,气溶胶AOD,Angstr?m指数,浑浊度平均值分别为0.5(±0.69)、0.95(±0.33)、0.24(±0.31),变异系数分别为139%、35%和132%.非污染天,AOD变化较小,峰值出现在15：00,但大气中细粒子组分相对较高；污染天,AOD波动很大,没有明显的日变化,颗粒物以细粒子为主.非污染天,当α<0.5,α与AOD呈反相关,α>1.0,两者呈现正相关；污染天,两者无明显关系,但当AOD>1.0,α随AOD的增大而变小.当Vmax<1m/s和1m/s<Vmax<4m/s,α随AOD呈现相似的变化,风速不会成为局地气溶胶变化的影响因素；当Vmax>4m/s,AOD和α均出现小值,α与AOD呈负相关.风向也是影响α和AOD变化的重要因素,尤其ENE为主导风向时,α与AOD呈明显正相关.温度的变化并未对α和AOD的变化造成很大影响.局地扬尘或沙尘气溶胶呈非亲水性,但当α>0.5,AOD随相对湿度(RH)的增大有一定程度的增大.
이용2010년10~11월CE318태양광도계관측자료,득출료북경시추계기용효광학후도(AODλ=500nm),Angstr?m파장지수(α)화혼탁도(β).결과현시,기용효AOD,Angstr?m지수,혼탁도평균치분별위0.5(±0.69)、0.95(±0.33)、0.24(±0.31),변이계수분별위139%、35%화132%.비오염천,AOD변화교소,봉치출현재15：00,단대기중세입자조분상대교고；오염천,AOD파동흔대,몰유명현적일변화,과립물이세입자위주.비오염천,당α<0.5,α여AOD정반상관,α>1.0,량자정현정상관；오염천,량자무명현관계,단당AOD>1.0,α수AOD적증대이변소.당Vmax<1m/s화1m/s<Vmax<4m/s,α수AOD정현상사적변화,풍속불회성위국지기용효변화적영향인소；당Vmax>4m/s,AOD화α균출현소치,α여AOD정부상관.풍향야시영향α화AOD변화적중요인소,우기ENE위주도풍향시,α여AOD정명현정상관.온도적변화병미대α화AOD적변화조성흔대영향.국지양진혹사진기용효정비친수성,단당α>0.5,AOD수상대습도(RH)적증대유일정정도적증대.
The aerosol optical depth (AODλ=500nm), Angstr?m wavelength exponent (α) and turbidity coefficient (β) are derived from sun photometer CE318measurements over Beijing from October to December 2010. The results show that, the mean values of AOD, Angstr?m wavelength exponent and turbidity coefficient are 0.5±0.69, 0.95±0.33, 0.24±0.31with coefficients of variation (CV) of 139%, 35%and 132%, respectively. AOD change little in polluted days with a peak at 15:00, but the concentrations of fine particles are relatively high. During polluted days, AOD fluctuate widely without a distinct diurnal variation, and the fine particles are the main components of the air pollutants. In addition, during the non-polluted days, positive and negative correlations are found betweenαand AOD whenαsmaller than 0.5and greater than 1.0, respectively. There is no clear correlation betweenαand AOD during the polluted days, while a decrease trend of αis detected with increase of AOD when αare lager than 1.0. It is indicated that wind speed would not play a critical role in the local changes of aerosol concentrations from similar variations betweenαand AOD when Vmax<1m/s or 1m/s<Vmax<4m/s;While both values of αand AOD are very small and shows negative correlation when Vmax>4m/s. Wind direction can also have large influence on the relationship between α and AOD, which shows a positive correlation especially for ENE direction. The temperature shift has little effect on variation ofαand AOD. AOD increase with relative humidity whenαis greater than 0.5though dust aerosols are hydrophobic in this study.