CAJ | 학술논문

在2012年秋季选取天气状况相对稳定的12 d,运用细颗粒化学组分在线观测仪(ACSM),观测西安大气颗粒物变化；利用正矩阵因子分析法(P MF )对大气细颗粒物中的有机物进行源解析,探讨其对能见度的影响；最后,结合IMPROVE公式中吸湿增长因子和多元线性回归统计方法重建散光系数.结果表明：在观测时段,PM1(不包括黑碳和矿尘等难熔组分)和 PM2．5质量浓度时间序列的相关性较好(判定系数为0．67),PM1约占PM2．5质量浓度的60％,有机物约占PM1质量浓度的58％,其他组分(包括SO2-4,NO-3,NH＋4和Cl-)约占42％；高相对湿度(大于85％)伴随着一次组分质量分数的增加,雨水对一次组分的湿沉降作用也更加明显；利用正矩阵因子分析法对有机物进行源解析,分解出烃类有机气溶胶(HOA)和氧化性有机气溶胶(OOA)两种组分；OOA 约占有机物质量浓度的54％,HOA约占46％,并且在下午时段,HOA 发生挥发,经过光化学反应快速转化为OOA；硝酸盐对光的散射贡献最大.
재2012년추계선취천기상황상대은정적12 d,운용세과립화학조분재선관측의(ACSM),관측서안대기과립물변화；이용정구진인자분석법(P MF )대대기세과립물중적유궤물진행원해석,탐토기대능견도적영향；최후,결합IMPROVE공식중흡습증장인자화다원선성회귀통계방법중건산광계수.결과표명：재관측시단,PM1(불포괄흑탄화광진등난용조분)화 PM2．5질량농도시간서렬적상관성교호(판정계수위0．67),PM1약점PM2．5질량농도적60％,유궤물약점PM1질량농도적58％,기타조분(포괄SO2-4,NO-3,NH＋4화Cl-)약점42％；고상대습도(대우85％)반수착일차조분질량분수적증가,우수대일차조분적습침강작용야경가명현；이용정구진인자분석법대유궤물진행원해석,분해출경류유궤기용효(HOA)화양화성유궤기용효(OOA)량충조분；OOA 약점유궤물질량농도적54％,HOA약점46％,병차재하오시단,HOA 발생휘발,경과광화학반응쾌속전화위OOA；초산염대광적산사공헌최대.
12 days with relative steady weather conditions in autumn of 2012 were selected,and the variation of atmospheric fine particle in Xi??an was measured by aerodyne aerosol chemical speciation monitor (ACSM);source apportionment of organics from atmospheric fine particle was analyzed by the means of positive matrix factorization (PMF),and the effect of atmospheric fine particle on visibility was discussed;finally,the scattering coefficient was reconstructed by the means of hygroscopic growth factors from IMPROVE equation and multi-linear regression statistical method.The results show that the correlation between time series of mass concentrations of non-refractory PM1 (except for black carbon and mineral dust)and PM2.5 is significant with a determination coefficient of 0.67 at the observation session;the mass concentration of non-refractory PM1 is about 60% of PM2.5 ,and the mass concentration of organic is about 58% of PM1 ,other components (including SO2-4 ,NO-3 ,NH+4 and Cl-)is about 42%;higher relative humidity increases the mass fraction of primary component,and rainfall significantly improves the wet deposition of primary component;hydrocarbon-like organic aerosol (HOA ) and oxygenated organic aerosol (OOA)are resolved from organics by the means of PMF;mass concentration of OOA is about 54% of organics,and that of HOA is about 46%;HOA volatilizes and translates to OOA after a photochemical reaction in the afternoon;nitrate contributes most to light scattering coefficient.