Polarization Lidar Measurements of Dust Optical Properties at the Junction of the Taklimakan Desert–Tibetan Plateau

Dong, Qingqing; Huang, Zhongwei; Li, Wuren; Li, Ze; Song, Xiuzu; Li, Wentao; Wang, Tianhe; Bi, Jun; Shi, Jun

doi:10.3390/rs14030558

Cited by 27 publications

(12 citation statements)

References 80 publications

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“…These values of LR are consistend with the assumption of a LR of 44 sr used for the Klett inversion for this case study. It is also consistent with LR of desert dust considered in other studies ( [47,48]).…”

Section: Resultssupporting

confidence: 93%

Added Value of Aerosol Observations of the Future AOS High Spectral Resolution Lidar with Respect to a Classic Backscatter Spaceborne Lidar Measurements

Cornut¹,

Amraoui²,

Cuesta³

et al. 2022

Preprint

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In the context of the Atmospheric Observing System (AOS) international program, a new generation spaceborne lidar is expected to be in polar orbit for deriving new observations of aerosol and clouds. In this work, we analyze the added values of these new observations for characterizing aerosol vertical distribution. For this, synthetic observations are simulated using the BLISS lidar simulator in terms of backscatter coefficient at 532 nm. We consider two types of lidar instruments, an elastic backscatter lidar instrument and a high spectral resolution lidar (HSRL). These simulations are performed with atmospheric profiles from a Nature Run (NR) modeled by the MOCAGE Chemical Transport Model. In three case studies involving large events of different aerosol species, the added value of the HSRL channel for measuring aerosol backscatter profiles with respect to simple backscatter measurements is shown. Observations independent from an a-priori lidar Ratio assumption, as done typically for simple backscattering instruments, allows probing the vertical structure of aerosol layers without divergence, even in case of intense episodes. Relative error in the backscatter coefficient profiles are observed to lay between +40% and -40% for low abudancies, with mean biases between +5% and -5%. A 5-day study in the case of desert dust completes the study of the added value of the HSRL channel with relative mean bias from the NR of the order of 1.5%.

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Section: Resultssupporting

confidence: 93%

Added Value of Aerosol Observations of the Future AOS High Spectral Resolution Lidar with Respect to a Classic Backscatter Spaceborne Lidar Measurements

Cornut¹,

Amraoui²,

Cuesta³

et al. 2022

Preprint

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“…The PDR was calculated by Equation (2) of reference [50]. The planetary boundary height (BLH) was calculated using a maximum difference search algorithm that incorporated the TABC and volume polarization ratio (VDR) measured by multi-wavelength polarization lidar at wavelengths of 532 and 355 nm, respectively [51].…”

Section: Lidar Systems and Methodsmentioning

confidence: 99%

Vertical Structure of Dust Aerosols Observed by a Ground-Based Raman Lidar with Polarization Capabilities in the Center of the Taklimakan Desert

Zhang

Huang

et al. 2022

Remote Sensing

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The vertical structure of dust properties in desert sources is crucial for evaluating their long-range transportation and radiative forcing. To investigate vertical profiles of dust optical properties in the Taklimakan Desert, we conducted ground-based polarization Raman lidar measurements in Tazhong (83.39°E, 38.58°N, 1103 m above sea level), located at the center of the Taklimakan Desert in the summer of 2019. The lidar system developed by Lanzhou University for continuous network observation is capable of measuring polarization at 532 and 355 nm and detecting Raman signals at 387, 407, and 607 nm. The results indicate that dust aerosols in the central Taklimakan Desert were regularly lifted over 6 km during the summer with a mass concentration of 400–1000 µg m−3, while the majority of the dust remained restricted within 2 km. Moreover, the height of the boundary layer can reach 5–6 km in the afternoon under the strong convention. Above 3 km, dust is composed of finer particles with an effective radius (Reff.) less than 3 μm and a Ångström exponent (AE) related to the extinction coefficient (AEE)532,355 greater than 4; below 3 km, however, dust is dominated by coarser particles. In addition, the particle depolarization ratios (PDR) of Taklimakan dust are 0.32 ± 0.06 at 532 nm and 0.27 ± 0.04 at 355 nm, while the lidar ratios (LRs) are 49 ± 19 sr at 532 nm and 43 ± 12 sr at 355 nm. This study firstly provides information on dust vertical structure and its optical properties in the center of the desert, which may aid in further evaluating their associated impacts on the climate and ecosystem.

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“…Six aerosol types were described in the vertical feature mask (VFM, version: 4.20) of CALIPSO Level 2 product, including clear marine, dust, polluted continental, clean continental, polluted dust, and smoke. Polarization measurement is very useful to distinguish dust from other aerosols (Z. Huang et al., 2018; Sugimoto & Huang, 2014), even dual‐wavelength polarization can improve the identification of aerosol types (Dong et al., 2022; Z. Huang et al., 2020; Zhang et al., 2022). Among them, continuous dust and polluted dust were selected to identify the dust layer in region a (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

“…Polarization measurement is very useful to distinguish dust from other aerosols (Z. Huang et al, 2018;Sugimoto & Huang, 2014), even dual-wavelength polarization can improve the identification of aerosol types (Dong et al, 2022;Zhang et al, 2022). Among them, continuous dust and polluted dust were selected to identify the dust layer in region a (Figure 1).…”

Section: Dust Cases Identificationmentioning

confidence: 99%

Long‐Range Transport and Evolution of Saharan Dust Over East Asia From 2007 to 2020

Liu

Huang

et al. 2022

JGR Atmospheres

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Previous studies have shown that Saharan dust can be transported thousands of miles, affecting regional climates, environments, and ecosystems. However, research on the long‐range transport of Saharan dust in Asia remains limited. We systematically investigated the long‐range transportation of Saharan dust over East Asia from 2007 to 2020 using WRF‐Chem model simulations, space‐borne CALIPSO lidar observations, NCEP/NCAR reanalysis data, as well as HYSPLIT trajectory analysis. The results show that one quarter (24.3 ± 6.2%) of dust events in East Asia during 2007–2020 originated from the Sahara Desert. Moreover, long‐range transported Saharan dust over East Asia was usually distributed in the upper troposphere. The average total amount of transported Saharan dust over East Asia between 2010 and 2015 was estimated at 33.05 ± 9.78 Tg/yr. Additionally, Saharan dust could be transported eastward all year and contributed about 35.8% of dust loading in the upper troposphere in Northern China in spring, which is almost the same amount of dust aerosols lifted up from East Asian dust sources. This study provides new sights on the important role of Saharan dust over East Asia, and elucidates the influence of long‐range transported dust on regional climate and the water cycle.

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Polarization Lidar Measurements of Dust Optical Properties at the Junction of the Taklimakan Desert–Tibetan Plateau

Cited by 27 publications

References 80 publications

Added Value of Aerosol Observations of the Future AOS High Spectral Resolution Lidar with Respect to a Classic Backscatter Spaceborne Lidar Measurements

Added Value of Aerosol Observations of the Future AOS High Spectral Resolution Lidar with Respect to a Classic Backscatter Spaceborne Lidar Measurements

Vertical Structure of Dust Aerosols Observed by a Ground-Based Raman Lidar with Polarization Capabilities in the Center of the Taklimakan Desert

Long‐Range Transport and Evolution of Saharan Dust Over East Asia From 2007 to 2020

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