Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.5194/acp-20-9265-2020 |
Optical properties of Central Asian aerosol relevant for spaceborne lidar applications and aerosol typing at 355 and 532 nm | |
Hofer, Julian; Ansmann, Albert; Althausen, Dietrich; Engelmann, Ronny; Baars, Holger; Fomba, Khanneh Wadinga; Wandinger, Ulla; Abdullaev, Sabur F.; Makhmudov, Abduvosit N. | |
通讯作者 | Hofer, J |
来源期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2020 |
卷号 | 20期号:15页码:9265-9280 |
英文摘要 | For the first time, a dense data set of particle extinction-to-backscatter ratios (lidar ratios), linear depolarization ratios, and backscatter- and extinction-related Angstrom exponents for a Central Asian site are presented. The observations were performed with a continuously running multiwavelength polarization Raman lidar at Dushanbe, Tajikistan, during an 18-month campaign (March 2015 to August 2016). The presented seasonally resolved observations fill an important gap in the database of aerosol optical properties used in aerosol typing efforts with spaceborne lidars and ground-based lidar networks. Lidar ratios and depolarization ratios are also basic input parameters in spaceborne lidar data analyses and in efforts to harmonize long-term observations with different space lidar systems operated at either 355 or 532 nm. As a general result, the found optical properties reflect the large range of occurring aerosol mixtures consisting of long-range-transported dust (from the Middle East and the Sahara), regional desert, soil, and salt dust, and anthropogenic pollution. The full range from highly polluted to pure dust situations could be observed. Typical dust depolarization ratios of 0.23-0.29 (355 nm) and 0.300.35 (532 nm) were observed. In contrast, comparably low lidar ratios were found. Dust lidar ratios at 532 nm accumulated around 35-40 sr and were even lower for regional background dust conditions (20-30 sr). Detailed correlation studies (e.g., lidar ratio vs. depolarization ratios, Angstrom exponent vs. lidar ratio and vs. depolarization ratio) are presented to illuminate the complex relationships between the observed optical properties and to identify the contributions of anthropogenic haze, dust, and background aerosol to the overall aerosol mixtures found within the 18-month cam- paign. The observation of 532 nm lidar ratios (< 25 sr) and depolarization ratios (around 15 %-20 %) in layers with very low particle extinction coefficient (< 30 sr) suggests that direct emission and emission of resuspended salt dust (initially originated from numerous desiccating lakes and the Aralkum desert) have a sensitive impact on the aerosol background optical properties over Dushanbe. |
类型 | Article |
语种 | 英语 |
开放获取类型 | DOAJ Gold, Green Accepted |
收录类别 | SCI-E |
WOS记录号 | WOS:000558787100001 |
WOS关键词 | SPECTRAL-RESOLUTION LIDAR ; CLOUD CONDENSATION NUCLEI ; POLARIZATION RAMAN LIDAR ; TO-BACKSCATTER RATIO ; SAHARAN DUST ; DEPOLARIZATION-RATIO ; PARTICLE BACKSCATTER ; WIND OBSERVATIONS ; ATLANTIC-OCEAN ; MINERAL DUST |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/325576 |
作者单位 | [Hofer, Julian; Ansmann, Albert; Althausen, Dietrich; Engelmann, Ronny; Baars, Holger; Fomba, Khanneh Wadinga; Wandinger, Ulla] Leibniz Inst Tropospher Res, Leipzig, Germany; [Abdullaev, Sabur F.; Makhmudov, Abduvosit N.] 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. Optical properties of Central Asian aerosol relevant for spaceborne lidar applications and aerosol typing at 355 and 532 nm[J],2020,20(15):9265-9280. |
APA | Hofer, Julian.,Ansmann, Albert.,Althausen, Dietrich.,Engelmann, Ronny.,Baars, Holger.,...&Makhmudov, Abduvosit N..(2020).Optical properties of Central Asian aerosol relevant for spaceborne lidar applications and aerosol typing at 355 and 532 nm.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(15),9265-9280. |
MLA | Hofer, Julian,et al."Optical properties of Central Asian aerosol relevant for spaceborne lidar applications and aerosol typing at 355 and 532 nm".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.15(2020):9265-9280. |
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