塔吉克斯坦南部夏季沙尘的垂直分布、光学性质和来源归属：地面观测和模式结果

IF 3.7 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Atmospheric Environment Pub Date : 2025-08-28 DOI:10.1016/j.atmosenv.2025.121514

Zhongwei Huang , Qingqing Dong , Tian Zhou , Jianrong Bi , Rui Chen , Qiantao Liu , Sabur F. Abdullaev , Dilovar Nozirov , Khan Alam , Tianhe Wang , Wuren Li , Ze Li , Xiaodong Song , Wentao Liu

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引用次数: 0

摘要

据了解，沙尘暴在塔吉克斯坦南部夏季频繁发生，这主要来自卫星观测。然而，由于缺乏连续的地面测量，对尘埃特征的全面了解仍然有限。2023年6月，我们在塔吉克斯坦南部Shaartuz建立了沙尘气溶胶物理光学性质观测站。本研究报告了2023年7月19日至26日发生的沙尘暴，重点研究了沙尘气溶胶的时空分布和来源。结果表明，在整个观测期间，超过10 μm的颗粒的数量和质量浓度都保持可观，证实了粗态尘埃颗粒的持续存在。活动期间，近地面PM10和PM2.5浓度分别达到3841 μg/m3和695 μg/m3，与7月19日沙尘暴爆发时间一致。通过对激光雷达提取的去极化比和显色比的统计分析，发现两个不同的粉尘层共存。位于1.6 km以下的低层主要受到中亚西北部气团的影响，而位于2.2 km ~ 4 km之间的高层主要来自南部沙漠地区。此外，这两个沙尘层的光学特性有很大不同，这表明来自不同沙尘源的沙尘气溶胶对塔吉克斯坦南部气候的影响可能是复杂的。这些结果突出了沙尘气溶胶的时空演化特征和运移路径，有助于进一步评价其对塔吉克斯坦南部气候和环境的影响。这些结果突出了沙尘气溶胶的时空演化特征和运移路径，有助于进一步评价其对塔吉克斯坦南部气候和环境的影响。

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Vertical distribution, optical properties, and source attribution of summer dust in southern Tajikistan: ground-based observations and model results

It is known that dust storms frequently occur during the summer in southern Tajikistan, mainly from satellite-based observations. However, a comprehensive understanding of dust characteristics remains limited due to the scarcity of continuous ground-based measurements. In June of 2023, we established an observational station for investigating the physical and optical properties of dust aerosols in Shaartuz, southern Tajikistan. This study reports dust storms that occurred from July 19 to 26, 2023, focusing on the spatiotemporal distribution and sources of dust aerosols. It is shown that both number and mass concentrations of particles exceeding 10 μm remained substantial throughout the observation period, confirming the persistent presence of coarse-mode dust particles. During the event, PM₁₀ and PM_2.5 concentrations near the ground reached up to 3841 μg/m³ and 695 μg/m³, respectively, coinciding with the dust storm outbreak on July 19. Two coexisting distinct dust layers were found based on statistical analysis of lidar-derived depolarization ratio and color ratio. The lower layer, located below approximately 1.6 km, was predominantly impacted by air masses from northwest Central Asia, whereas the higher elevated layer distributed between 2.2 km and 4 km, was originated from the southern desert regions. Moreover, optical properties of these two dust layers are largely different, indicating that impact of dust aerosols originated from various dust sources on climate in southern Tajikistan may complex. These results highlight the characteristics of the spatiotemporal evolution, transport pathways of dust aerosols, helping to further evaluate their climatic and environmental impacts in southern Tajikistan. These results highlight the characteristics of the spatiotemporal evolution and transport pathways of dust aerosols, and help to further evaluate their climatic and environmental impacts in southern Tajikistan.

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来源期刊

Atmospheric Environment 环境科学-环境科学

CiteScore

9.40

自引率

8.00%

发文量

458

审稿时长

53 days

期刊介绍： Atmospheric Environment has an open access mirror journal Atmospheric Environment: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Atmospheric Environment is the international journal for scientists in different disciplines related to atmospheric composition and its impacts. The journal publishes scientific articles with atmospheric relevance of emissions and depositions of gaseous and particulate compounds, chemical processes and physical effects in the atmosphere, as well as impacts of the changing atmospheric composition on human health, air quality, climate change, and ecosystems.