气候与环境研究
氣候與環境研究
기후여배경연구
Climatic and Environmental Research
2015年
6期
611-619
,共9页
陈学舜%王自发%李杰%余方群%胡敏
陳學舜%王自髮%李傑%餘方群%鬍敏
진학순%왕자발%리걸%여방군%호민
NAQPMS+APM模式%粒子谱分布%一次粒子%二次粒子
NAQPMS+APM模式%粒子譜分佈%一次粒子%二次粒子
NAQPMS+APM모식%입자보분포%일차입자%이차입자
NAQPMS+APM model%Particle number size distribution%Primary particle%Secondary particle
利用包含详细微物理动力学机制的NAQPMS+APM (Nested Air Quality Prediction Modeling System with Advanced Particle Microphysics)模式，对北京城市大气2006年1月15日至2月13日期间的粒子数浓度谱分布进行了模拟，模式模拟结果合理，能够很好地再现北京城市大气细粒子的数浓度谱分布演变特征。分析表明，北京冬季大气新粒子形成事件频发，核化作用使核模态粒子数浓度急剧升高；污染累积时，积聚模态粒子数浓度显著增大，而核模态粒子数浓度很小，粒子谱分布向大粒子端移动；重污染期间，粒子微物理混合作用强烈，二次成分在一次粒子上的附着使一次粒子粒径显著增大，二次成分可使一次粒子粒径增大50%以上，积聚模态的二次粒子与一次粒子共同促进了污染的形成。在北京及其近周边区域，北京南部和河北南部一次粒子数量多，占据主导地位，而在河北北部二次粒子则占主导地位。
利用包含詳細微物理動力學機製的NAQPMS+APM (Nested Air Quality Prediction Modeling System with Advanced Particle Microphysics)模式，對北京城市大氣2006年1月15日至2月13日期間的粒子數濃度譜分佈進行瞭模擬，模式模擬結果閤理，能夠很好地再現北京城市大氣細粒子的數濃度譜分佈縯變特徵。分析錶明，北京鼕季大氣新粒子形成事件頻髮，覈化作用使覈模態粒子數濃度急劇升高；汙染纍積時，積聚模態粒子數濃度顯著增大，而覈模態粒子數濃度很小，粒子譜分佈嚮大粒子耑移動；重汙染期間，粒子微物理混閤作用彊烈，二次成分在一次粒子上的附著使一次粒子粒徑顯著增大，二次成分可使一次粒子粒徑增大50%以上，積聚模態的二次粒子與一次粒子共同促進瞭汙染的形成。在北京及其近週邊區域，北京南部和河北南部一次粒子數量多，佔據主導地位，而在河北北部二次粒子則佔主導地位。
이용포함상세미물리동역학궤제적NAQPMS+APM (Nested Air Quality Prediction Modeling System with Advanced Particle Microphysics)모식，대북경성시대기2006년1월15일지2월13일기간적입자수농도보분포진행료모의，모식모의결과합리，능구흔호지재현북경성시대기세입자적수농도보분포연변특정。분석표명，북경동계대기신입자형성사건빈발，핵화작용사핵모태입자수농도급극승고；오염루적시，적취모태입자수농도현저증대，이핵모태입자수농도흔소，입자보분포향대입자단이동；중오염기간，입자미물리혼합작용강렬，이차성분재일차입자상적부착사일차입자립경현저증대，이차성분가사일차입자립경증대50%이상，적취모태적이차입자여일차입자공동촉진료오염적형성。재북경급기근주변구역，북경남부화하북남부일차입자수량다，점거주도지위，이재하북북부이차입자칙점주도지위。
Particle number size distribution in Beijing was simulated during the period 15 January to 13 March 2006 using NAQPMS+APM (Nested Air Quality Prediction Modeling System with Advanced Particle Microphysics). The simulated number size distribution of fine particles agreed well with observations. The simulation results showed that new particle formation occurred frequently. The nucleation-mode particle number concentration increased drastically due to the nucleation process during new particle formation. In pollution periods, the number concentration of accumulation-mode particles increased, while the nucleation-mode particle number concentration deceased obviously. Moreover, the particle number size distribution shifted towards larger diameters. In heavy pollution episodes, the particle size increased significantly due to intense mixing through microphysical processes. The sizes of primary particles could be 50%larger than their core size due to secondary species coating on them. Accumulation-mode secondary and primary particles together contributed to pollution formation. For Beijing and surrounding areas, the simulation results showed that primary particles dominated particle numbers in the south of Beijing and Hebei, while secondary particles were dominant in the northern part of Hebei.
