Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-20-4695-2020 |
Long-term profiling of aerosol light extinction, particle mass, cloud condensation nuclei, and ice-nucleating particle concentration over Dushanbe, Tajikistan, in Central Asia | |
Hofer, Julian1; Ansmann, Albert1; Althausen, Dietrich1; Engelmann, Ronny1; Baars, Holger1; Abdullaev, Sabur F.2; Makhmudov, Abduvosit N.2 | |
2020-04-21 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2020 |
卷号 | 20期号:8页码:4695-4711 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; Tajikistan |
英文摘要 | For the first time, continuous, vertically resolved long-term aerosol measurements were conducted with a state-of-the-art multiwavelength lidar over a Central Asian site. Such observations are urgently required in efforts to predict future climate and environmental conditions and to support spaceborne remote sensing (ground truth activities). The lidar observations were performed in the framework of the Central Asian Dust Experiment (CADEX) at Dushanbe, Tajikistan, from March 2015 to August 2016. An AERONET (AErosol RObotic NETwork) sun photometer was operated at the lidar field site. During the 18-month campaign, mixtures of continental aerosol pollution and mineral dust were frequently detected from ground to cirrus height level. Regional sources of dust and pollution as well as long-range transport of mineral dust mainly from Middle Eastern and the Saharan deserts determine the aerosol conditions over Tajikistan. In this study, we summarize our findings and present seasonally resolved statistics regarding aerosol layering (main aerosol layer depth, lofted layer occurrence); optical properties (aerosol and dust optical thicknesses at 500-532 nm, vertically resolved light-extinction coefficient at 532 nm); profiles of dust and non-dust mass concentrations and dust fraction; and profiles of particle parameters relevant for liquid water, mixed-phase cloud, and cirrus formation such as cloud condensation nuclei (CCN) and ice-nucleating particle (INP) concentrations. The main aerosol layer over Dushanbe typically reaches 4-5 km height in spring to autumn. Frequently lofted dust-containing aerosol layers were observed at heights from 5 to 10 km, indicating a sensitive potential of dust to influence cloud ice formation. Typical dust mass fractions were of the order of 60%-80%. A considerable fraction is thus anthropogenic pollution and biomass burning smoke. The highest aerosol pollution levels (in the relatively shallow winter boundary layer) occur during the winter months. The seasonal mean 500 nm AOT (aerosol optical thickness) ranges from 0.15 in winter to 0.36 in summer during the CADEX period (March 2015 to August 2016); DOTs (dust optical thicknesses) were usually below 0.2; seasonally mean particle extinction coefficients were of the order of 100-500 Mm(-1) in the main aerosol layer during the summer half year and about 100-150 Mm(-1) in winter but were mainly caused by anthropogenic haze. Accordingly, the highest dust mass concentrations occurred in the summer season (200-600 mu g m(-3)) and the lowest during the winter months (20-50 mu g m(-3)) in the main aerosol layer. In winter, the aerosol pollution mass concentrations were 20-50 mu g m(-3), while during the summer half year (spring to autumn), the mass concentration caused by urban haze and biomass burning smoke decreases to 10-20 mu g m(-3) in the lower troposphere. The CCN concentration levels are always controlled by aerosol pollution. The INP concentrations were found to be high enough in the middle and upper troposphere to significantly influence ice formation in mixed-phase and ice clouds during spring and summer seasons. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000529310000007 |
WOS关键词 | HIGH-MOUNTAIN ASIA ; POLARIZATION LIDAR ; SAHARAN DUST ; MINERAL DUST ; RAMAN LIDAR ; NUMBER CONCENTRATION ; DESERT DUST ; TIEN-SHAN ; CLIMATE ; AERONET |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/248966 |
专题 | 地球科学 |
作者单位 | 1.Leibniz Inst Tropospher Res, Leipzig, Germany; 2.Acad Sci Tajikistan, Phys Tech Inst, Dushanbe, Tajikistan |
推荐引用方式 GB/T 7714 | Hofer, Julian,Ansmann, Albert,Althausen, Dietrich,et al. Long-term profiling of aerosol light extinction, particle mass, cloud condensation nuclei, and ice-nucleating particle concentration over Dushanbe, Tajikistan, in Central Asia[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2020,20(8):4695-4711. |
APA | Hofer, Julian.,Ansmann, Albert.,Althausen, Dietrich.,Engelmann, Ronny.,Baars, Holger.,...&Makhmudov, Abduvosit N..(2020).Long-term profiling of aerosol light extinction, particle mass, cloud condensation nuclei, and ice-nucleating particle concentration over Dushanbe, Tajikistan, in Central Asia.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(8),4695-4711. |
MLA | Hofer, Julian,et al."Long-term profiling of aerosol light extinction, particle mass, cloud condensation nuclei, and ice-nucleating particle concentration over Dushanbe, Tajikistan, in Central Asia".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.8(2020):4695-4711. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论