Observational Study on the Atmospheric Mixed Layer and Transition Layer Structures Using a Mie Lidar

Sasano, Yasuhiro

doi:10.2151/jmsj1965.63.3_419

Cited by 16 publications

(4 citation statements)

References 38 publications

(34 reference statements)

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“…In this section, the characteristics of the fluctuations of Q and *(Q' and *') at the top of the boundary layer is investigated. A similar schematic model is obtained by a Lidar observation (Sasano, 1985).…”

Section: Observational Results Of the Fluctuations Ofmentioning

confidence: 53%

Aircraft Observation of the Specific Humidity and Process of the Water Vapor Transfer in the Upper Mixed Boundary Layer

Yamamoto¹,

Gamo²,

Yokoyama³

1988

Journal of the Meteorological Society of Japan

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The structure of the upper part of mixed layer and the exchange mechanism between mixed layer and upper stable layer are investigated using the humidity (Q) and potential temperature (*) data observed on an airplane. It was found that Q was nearly constant with height in the mixed layer and decreased sharply at some upper height. This height is coincident in almost all the cases with the mixed layer height determined from the vertical profile of *. During the developing process of the mixed layer, the humid air-mass is brought to the upper layer by thermal convections, and these convections penetrate into the upper stable layer as humid and cold plumes.At the top of the mixed layer, a wave-like surface is formed due to the influence of the wave-motion in the upper stable layer and intake-flows are induced in the vicinity of the upper boundary of the mixed layer. The dry and warm air in the upper layer is taken into the mixed layer by these intake-flows. During the decay of the thermal convections, the thickness of the mixed layer decreases with time due to these descending flows. The boundary surface between the mixed and upper stable layers has periodic undulations and their wavelength is about 2000-3000m and the amplitude is 100-200m.

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Section: Observational Results Of the Fluctuations Ofmentioning

confidence: 53%

Aircraft Observation of the Specific Humidity and Process of the Water Vapor Transfer in the Upper Mixed Boundary Layer

Yamamoto¹,

Gamo²,

Yokoyama³

1988

Journal of the Meteorological Society of Japan

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“…This technique helps to protect the laser transmitter from being getting damaged while scanning. In traditional lidar systems, the laser transmitter and telescope rotated together while scanning (Sasano, 1985). This approach can easily damage the laser transmitter, or require frequent calibration for the long-term operation.…”

Section: Lidar and Auxiliary Equipmentmentioning

confidence: 99%

A new mobile and portable scanning lidar for profiling the lower troposphere

Chiang

Das

Chiang

et al. 2015

Geosci. Instrum. Method. Data Syst.

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Abstract. An in-house developed mobile and portable threedimensional scanning lidar system is discussed in this work. The system uses a stimulated Raman-scattering technique for the continuous observation of atmospheric aerosols, clouds and trace gases. This system has a fast scanning technique with a high-speed data acquisition, and permits the real-time measurement of atmospheric pollutants with the temporal resolution of 1 min. This scanning lidar system provides typical horizontal coverage of about 8-10 km while scanning; however, in zenith mode, good quality backscattered signals can be from 20 km, depending upon the laser power and sky conditions. This versatile lidar system has also overcome the drawbacks which are popular in the traditional scanning lidar systems such as complicated operation, overlap height between laser beam and telescope field of view In this system, the optical damage is reduced by using an integral coaxial transmitter and receiver. Some of the initial results obtained from the scanning lidar system are also presented. This study shows that boundary-layer structure and land-sea breeze circulation can be resolved from the developed scanning lidar system. The application of this lidar system to measure the pollutants over an industrial area is also discussed.

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“…This technique helps to avoid the laser transmitter being gotten damage while scanning. In earlier lidar system, the laser transmitter and telescope rotate together while scanning (Sasano, 1985). This approach can easily damage the laser transmitter, or require frequent calibration for the long-term operation.…”

Section: System Description and Capabilitiesmentioning

confidence: 99%

A new mobile and portable scanning lidar for profiling lower troposphere

Chiang¹,

Das²,

Chiang³

et al. 2014

Preprint

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Abstract. We present and discuss on an indigenously developed mobile and portable 3-D scanning lidar system. The system utilizes a stimulated Raman-scattering technique for the continuous observation of atmospheric aerosols, clouds and trace gases. The system provides fast scanning technique with a high speed data acquisition, which permits the real-time measurement of air pollutant mobility. The temporal resolution of data retrieval is every one min. The scanning lidar system provides typical horizontal coverage of about 8–10 km when scanning, while the vertical range can be up to 20 km depending upon the laser power and sky conditions. This versatile lidar system has also overcome the drawbacks which are popular in the other scanning lidar system such as complicated operation; overlapping height between laser beam and telescope field of view; and damage of optic detectors for long duration measurement by using an integral coaxial transmitter and receiver. Some of the initial results obtained from the scanning lidar system are also presented. We have shown that the developed 3-D scanning lidar system can resolve the boundary layer structure and land-sea breeze circulation. Discussion is also made on the application of scanning lidar system to measure pollutant over industrial areas.

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Observational Study on the Atmospheric Mixed Layer and Transition Layer Structures Using a Mie Lidar

Cited by 16 publications

References 38 publications

Aircraft Observation of the Specific Humidity and Process of the Water Vapor Transfer in the Upper Mixed Boundary Layer

Aircraft Observation of the Specific Humidity and Process of the Water Vapor Transfer in the Upper Mixed Boundary Layer

A new mobile and portable scanning lidar for profiling the lower troposphere

A new mobile and portable scanning lidar for profiling lower troposphere

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