Optical and geometrical properties of cirrus clouds from lidar measurements above Hanoi, Vietnam

Bui, Hai V.; Le, Manh Duy; Dinh, Trung Van; Nguyen, Tuan Xuan; Pham, Tien M.; Tran, Hung N.; Pham, Bang D.; Nguyen, Bao T. T.; Nguyen, Binh T.; Nguyen, Hung Ngoc

doi:10.1117/1.jrs.13.034523

Cited by 1 publication

(6 citation statements)

References 29 publications

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“…Moreover, we utilize the data of MSIS-E-90 model, an empirical model of the temperature and composition of the atmosphere at heights between 0 km and 700 km [11,14,29], to directly calculate the optical depth of molecular in the range of the clean atmospheric layer. Typically, the range of clean air is chosen to be between 7 km and 20 km.…”

Section: Lidar Data Analysismentioning

confidence: 99%

“…Observations of the near-surface layer using lidar techniques are frequently conducted at atmospheric and environmental research centers over the world [1,5,10,20]. In recent years, alongside remote sensing techniques using balloons, lidar technology has also been employed and has yielded highly valuable research data [11][12][13][14].…”

Section: Determination Of Overlap Functionmentioning

confidence: 99%

“…The aerosol layer over 6 km known as cirrus clouds in troposphere is the important component in the atmosphere of the earth. This is the main power budget of the sun radiation and makes two opposite effects known as greenhouse and albedo effects [2,14]. These phenomena are major contributors to the rising temperatures of our planet.…”

Section: Macro-optical Propertiesmentioning

confidence: 99%

“…6 showed a case of a thick cirrus cloud, the back signals are averaged in 15 minutes in counting mode by gated PMT. We can derive the height of base and top of cirrus layer at 13.5 km and 17.0 km using threshold method [14]. From this data, we calculate an optical depth and averaged lidar ratio of this cirrus cloud layer to be 0.21 and 39, respectively.…”

Section: Micro-optical Propertiesmentioning

confidence: 99%

“…Over the past decade, a multi-channels lidar system has been developed and operated for continuously monitoring atmosphere at a station in 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam. Our lidar group has reported impressive results in articles [11][12][13][14], which detail the objectives of using lidar technology, as well as its application in researching the physical properties and distribution of the boundary layer and cirrus clouds over Hanoi (21.03˚N, 105.85˚E).…”

Section: Introductionmentioning

confidence: 99%

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Development of a versatile lidar system based on passively Q-switched Nd: YAG laser for monitoring aerosols and cirrus clouds in the atmosphere

Bui,

Dinh,

Nguyen

et al. 2023

Comm. Phys.

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Mobile lidar systems are important for sampling and monitoring over wide separated locations. In this paper, we present an in-house developed flexible and portable lidar system integrating an inexpensive passively Q-switched laser Nd:YAG and a detection module working in both analog and photon counting mode for studying the atmospheric boundary layer (BL) and cirrus clouds (CC). We developed a passively q-switched Nd:YAG pulsed laser operating at a wavelength of 532 nm with pulse energy up to 200 mJ and repetition rate of 1 Hz - 15 Hz. Our lidar system is designed to provide multi-angle lidar measurements up to 25 km. The multi-angle capability allows direct determination of the overlap function to characterize the lidar system by measuring the horizontal lidar signal. We use our lidar system to monitor the boundary layer and cirrus clouds over several locations Hanoi, Quangbinh, Danang, and Ho-Chi-Minh city. From the measurements, we derive the main properties such as the height, thickness, and optical depth of the earth’s surface aerosol layer and cirrus clouds. We demonstrate that this versatile compact and inexpensive lidar system is very useful for aerosol research and the study of high cirrus clouds.

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Section: Lidar Data Analysismentioning

confidence: 99%