摘要
为分析不同凝结核对霾滴散射特性的影响,讨论了NH4NO3、(NH4)2SO4、NaCl、Na2SO4四种可溶性盐核霾滴的吸湿增长及吸湿导致的复折射率变化对霾滴散射特性的影响,针对泥土型与非泥土型两类不可溶性凝结核霾滴,采用Aden-Kerker理论分析了凝结水参数β与散射效率因子、0°处散射相函数的关系。结果表明,可溶性盐核霾滴散射相函数随湿度变化显著;霾滴散射效率因子随湿度增加先增后减,对于核质量为10-13 g的霾滴,当湿度小于96%时,按散射能力强弱排序为NaCl、NH4NO3、(NH4)2SO4与Na2SO4霾滴,当湿度大于96%时,散射能力强弱排序为Na2SO4、(NH4)2SO4、NH4NO3、NaCl霾滴;对于2μm的不可溶性核霾滴,当β<0.5时,不同凝结核霾滴的射效率因子均随β增大而递增;但随着β增大,散射效率因子变化规律出现较大差异;双折射特性物质对e光和o光的散射特性存在一定差异,但在β整个变化区间内其变化趋势是一致的。
In order to analyze the effect of condensation nuclei on the scattering property of stable haze drops, the scattering property of haze drops with soluble nuclei（NH4NO3、（NH4）2SO4、NaCl、Na2SO4）, whose size and refractive index are changed with humidity, is firstly disscussed in this paper. Additionally, relationship between parameter of con- densed water （β） and scattering characteristics （scattering efficiency and value of phase function at 0°） of haze drops with non-clay and clay minernal nuclei is discussed by Aden- Kerker scattering theory. The result shows that phase functions of drops with soluble nu- clei changes dramatically when humidity changes, and scattering efficiency doesn＇t change monotonically with the increasing of humidity, for haze drops with nuclei of the same mass （10^-13g）, when humility is smaller than 96%, scattering capacities of different drops, from strong to weak, are NaCl、NH4NO3、（NH4）2SO4 and Na2SO4 in order, however when humility is larger than 96%, the order is reversed. Relationship between β and scattering characteristics of drops with insoluble nuclei is not monotonical, when β〈0.5, scattering efficiency of drops with different nuclei increases with the incearsing of β, however when β 〉0.5, discrepancies caused the difference of nuclei gradually become obvious. There is a little difference between scattering characteristics of o-ray and e-ray for drops with bire- fringent nuclei, but their trends are approximately the same in the whole range of β.
出处
《光散射学报》
北大核心
2013年第4期338-346,共9页
The Journal of Light Scattering
基金
国家自然科学基金(41205125)
国家自然科学基金重大仪器专项(41327003)
