胡春阳,樊曙先,王小龙,张鸿伟,朱丹丹. 2019. 庐山2016年冬季三级分档雾水化学特征[J]. 气象学报, (0):-, doi:10.11676/qxxb2019.034
庐山2016年冬季三级分档雾水化学特征
Chemical characteristics of the three-stage fog water in winter of 2016 in Lushan
投稿时间:2018-07-15  修订日期:2018-10-24
DOI:10.11676/qxxb2019.034
中文关键词:  三级分档雾水,化学特征,庐山
英文关键词:Three-stage fog water, Chemical characteristics, Lushan
基金项目:国家自然科学基金,其它
作者单位E-mail
胡春阳 南京信息工程大学 huchunyang927@126.com 
樊曙先 南京信息工程大学 shuxianf@nuist.edu.cn 
王小龙 中国人民解放军94582部队 1210852470@qq.com 
张鸿伟 南京信息工程大学 1105734447@qq.com 
朱丹丹 南京信息工程大学 noahmessi@163.com 
摘要点击次数: 359
全文下载次数: 251
中文摘要:
      探究不同尺度雾滴化学特征,是深化雾微物理化学研究的重要内容。2016年12月至2017年01月在庐山开展雾综合观测实验,利用主动式三级分档雾水采集器(CASCC 3_stage)收集到3次雾过程73个分档雾水样本,雾滴分档粒径:4-16μm(3级),16-22μm(2级)和≥22μm(1级)。定量得到了分档雾水的pH、电导率(EC)及9种水溶性无机离子(Na+、NH4+、K+、Mg2+、Ca2+、Cl-、NO2-、NO3-、SO42-)浓度(μeq/L)。结果表明,庐山冬季雾水酸化严重,pH介于3.96-5.82,pH<5.6的样品占98.6%且4-16μm小雾滴的重酸性(pH<4.5)样品最多占比达54.2%,小雾滴酸性和电导率更强;NH4+、Ca2+、NO3-、SO42-是雾水主要离子组分, [NH4++Ca2++NO3-+SO42-]分别在三级分档雾水中占总离子浓度(TIC)的83.8%、88.9%和87.3%;综合三次雾过程,TIC、NH4+、K+、NO3-、SO42-在4-16μm小雾滴存在富集,表现出尺度依赖特征;86%雾水样品[SO42-]/[NO3-]介于0.5-3.0,属于硫酸和硝酸混合型酸化,雾水酸化主要原因是碱性缓冲物质与酸性组分不平衡以及可能存在有机酸贡献;同一观测点不同雾过程化学特征存在个例差异,第二次雾过程(12.25.14:00-26.21:00 BT),TIC、NH4+、Ca2+、NO3-、SO42-在16-22μm尺度雾滴存在富集,这可能是雾区气溶胶浓度较低、降温、采样间隔和污染气体及气溶胶输送共同作用的结果。后向轨迹聚类和潜在源(PSCF)分析表明,观测期间影响庐山的气团均来自西部,来自湖南北部的局地气团占总轨迹数68.99%最为重要;PM2.5、SO2、NO2具有相似潜在源区空间分布,主要位于湖北、湖南、安徽西南部和江西北部等邻近省份地区,以近距离输送为主。
英文摘要:
      Exploring the chemical characteristics of droplets at different scales is an important part of deepening the research of fog microphysical and chemistry. From December 2016 to January 2017, the comprehensive observation experiment of fog was carried out in Lushan, three-stage Caltech Active Strand Cloud Collector(CASCC 3_stage) was used for size resolved fog sampling. Fifty percent droplet size cuts of 22, 16, and 4μm diameter are featured in stages one, two and three, respectively. A total of 73 samples of three fog events were collected. Quantitatively obtained the pH, conductivity(EC) and concentration of 9 water-soluble inorganic ions(Na+、NH4+、K+、Mg2+、Ca2+、Cl-、NO2-、NO3-、SO42-)in the three-stage fog water. The results showed that the fog water of Lushan was seriously acidified in winter, with a pH of 3.96-5.82 and the sample with pH<5.6 accounted 98.6%. Moreover, the heavy acid sample (pH<4.5) of 4-16μm small droplets accounts for up to 54.2%, and the small droplets is more acidic and conductive. NH4+、Ca2+、NO3-、SO42- are the main ionic components of fog water, [NH4++Ca2++NO3-+SO42-] accounted for 83.8%、 88.9% and 87.3% of the total ion concentration(TIC) in the three-stage fog water respectively. Combined with three fog processes, TIC、NH4+、K+、NO3- and SO42- are enriched in small droplets of 4-16μm, showing size-dependent characteristics. The 86% fog water sample [SO42-]/[NO3-] is between 0.5-3.0, which is a mixed acidification of sulfuric acid and nitric acid. The main reason for the acidification of the fog water is that the imbalance between alkaline buffer and acid component, and the possible contribution of organic acid. There are some differences in the chemical characteristics of different fog processes at the same observation point. In the second event(12.25.14:00-26.21:00 CST), TIC、NH4+、Ca2+、NO3- and SO42- are enriched in droplets of 16-22μm. This phenomenon may be the result of a combination of lower aerosol concentration, temperature drop, sampling interval,pollutant gas and aerosol transport in the fog region. Backward trajectory clustering and potential source contribution function(PSCF) showed that the air masses affecting Lushan during the observation period all came from the west, and the local air mass from northern part of Hunan accounted for 68.99% of the total trajectory. PM2.5、SO2、NO2 have similar potential source area spatial distribution, mainly located in neighboring provinces such as Hubei, Hunan, southwestern Anhui and northern Jiangxi, mainly for near distance transportation.
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