腾格里沙漠东北部地区沙尘气溶胶质量浓度变化特征  

Variation characteristics of dust aerosol mass concentration in the northeastern of Tengger Desert

作　　者：侯英 王长燕[1,2] HOU Ying;WANG Chang-yan(College of Geography and Environment,Baoji University of Arts and Sciences,Baoji 721013,Shaanxi,China;Shaanxi Key Laboratory of Disaster Monitoring and Mechanism Simulation,Baoji 721013,Shaanxi,China)

机构地区：[1]宝鸡文理学院地理与环境学院,陕西宝鸡721013 [2]陕西省灾害监测与机理模拟重点实验室,陕西宝鸡721013

出　　处：《宝鸡文理学院学报（自然科学版）》2023年第2期83-88,共6页Journal of Baoji University of Arts and Sciences(Natural Science Edition)

基　　金：国家自然科学基金项目(41771048);中国科学院黄土与第四纪地质国家重点实验室项目(SKLLQG1934)。

摘　　要：目的探究腾格里沙漠东北部地区典型扬沙天气过程中沙尘气溶胶的质量浓度变化特征,以期为沙尘气溶胶辐射气候效应的数值模拟提供参考。方法利用EDM 164型颗粒物监测仪对腾格里沙漠东北部地区沙尘气溶胶数浓度进行外场观测,获得了典型扬尘天气过程中沙尘气溶胶的数浓度采样资料。结果与结论(1)腾格里沙漠东北部地区典型扬沙天气过程中沙尘气溶胶质量浓度日变化呈双峰型分布特征,峰值分别出现在上午11时(471μg/m^(3))和下午16时(500μg/m^(3))。沙尘气溶胶质量浓度与大气压和相对湿度呈负相关关系(p<0.01),与温度和风速呈正相关关系(p<0.01)。(2)沙尘气溶胶数浓度主要分布在积聚模态内(97%),质量浓度主要分布在粗模态内(92%);沙尘气溶胶数浓度随着粒径的增加而减少,质量浓度谱呈明显的双峰型分布,质量浓度随着粒径的增加表现为先增加后减少的变化趋势,2个峰值分别出现在粒径4.5和2.75μm处。(3)沙尘气溶胶质量浓度谱可以用粗模态1和粗模态2进行对数正态分布拟合,2个模态的峰值所对应的粒度直径分别为2.75和4.5μm。Purposes—To explore the mass concentration variation characteristics of dust aerosol during typical sand-blowing weather in the northeastern of Tengger Desert,and to provide a reference for the numerical simulation of the radiation climate effect of dust aerosol.Methods—The EDM 164 particle monitor was used to observe the number concentration of dust aerosol in the northeastern of the Tengger Desert,and the sampling data of the number concentration of dust aerosol during typical sand-blowing weather were obtained.Results and Conclusions—(1)The daily variation characteristics of dust aerosol mass concentration in typical sand-blowing weather in the northeastern of Tengger Desert shows a bimodal distribution,with the peak values appearing at 11(471μg/m^(3))and 16(500μg/m^(3)),respectively.The mass concentration of dust aerosol is negatively correlated with atmospheric pressure and relative humidity(p<0.01),and positively correlated with temperature and wind speed(p<0.01).(2)The number concentration of dust aerosol was mainly distributed in the accumulation mode(97%),and the mass concentration was mainly distributed in the coarse mode(92%).The number concentration of dust aerosol decreases with the increase of particle size,and the mass concentration spectrum shows an obvious bimodal distribution.The mass concentration increases first and then decreases with the increase of particle size,and the two peaks appear at the particle size of 4.5 and 2.75μm,respectively.(3)The mass concentration spectra of dust aerosol can be fitted by the lognormal distribution of coarse mode 1 and coarse mode 2,respectively.The peak diameters of the two modes are 2.75 and 4.5μm,respectively.

关 键 词：腾格里沙漠 沙尘气溶胶 粒径分布 对数正态分布 

分 类 号：P401[天文地球—大气物理学与大气环境]