大气科学2017，Vol.41Issue(2)：409-420,12.DOI:10.3878/j.issn.1006-9895.1606.15272
西北地区气溶胶光学特性及辐射影响
Optical Characteristics and Radiative Effects of Atmospheric Aerosol over Northwest China
摘要
Abstract
AERONET (Aerosol Robotic Network) level 2.0 and CM_21 data in SACOL (Semi-Arid Climate and Environment Observatory of Lanzhou University) for 2006-2012 were used to analyze optical properties and radiative effects of aerosols over Northwest China.Meanwhile,the reason for the positive TOA (Top of Atmosphere) radiative forcing was examined by using the SBDART (Santa Barbara DISORT Atmospheric Radiative Transfer).The annual averages of BOA (Bottom of Atmosphere),TOA,and atmosphere radiative forcing are-59.43 W m-2,-17.03 W m-2,and 42.40 W m-z,respectively.The annual averages of AOD (aerosol optical depth,550 nm) and a (angstrom exponent,440-675 nm) are 0.37 and 0.91,respectively,a and AOD have opposite phases.The a value is within 0.0-0.2,which is very small,when the AOD is within 0.3-2.2.The annual averages of SSA (single scattering albedo,675 nm),g (asymmetry factor,675 nm) and the real part of the complex refractive index (675 nm) are 0.93,0.68,1.48,respectively.The annual trend of the real part is consistent with that of AOD while that of the imaginary part is opposite to that of AOD.Thereby the coarse-particle mode aerosols that have strong scattering effects dominate Northwest China.The maximum atmospheric heating rate occurs in 0-2 km and decreases with height based on the simulations with and without aerosol effects.The heating rates in the winter half year and summer half year are 2.6 K d-a and 0.6 K d-1 on the surface,respectively.In the four seasons,the heating rate is the largest in the winter,followed by that in the autumn and spring,and smallest in the summer with values of 2.5 K d-1,1.4 K d-1,1.2 K d-1,0.2 K d-1 on the surface in the winter,autumn,spring,and summer,respectively.The absorption by aerosols is stronger in the autumn than in the spring.Contributions of the surface albedo and SSA account for 22.5％ and 77.5％ of the positive radiative forcing at TOA,respectively.关键词
辐射强迫/SBDART模式/地表反照率/SSA(单次散射反照率)/加热率Key words
Radiative forcing/SBDART (Santa Barbara DISORT Atmospheric Radiative Transfer)/Surface albedo/SSA (single scattering albedo)/Heating rate分类
天文与地球科学引用本文复制引用
衣娜娜,张镭,刘卫平,田鹏飞,董祝雷..西北地区气溶胶光学特性及辐射影响[J].大气科学,2017,41(2):409-420,12.基金项目
国家重大科学研究计划项目2012CB955302,国家自然科学基金项目41475008 National Basic Research Program of China(Grant 2012CB955302),National Nature Science Foundation of China(Grant 41475008) （Grant 2012CB955302）
