A new method for measuring the imaginary part of the atmospheric refractive index structure parameter in the urban surface layer

Yuan, Renmin; Luo, Tao; Sun, Junqiang; Zeng, Zhihong; Chen, Ge; Fu, Yunfei

doi:10.5194/acp-15-2521-2015

Cited by 10 publications

(24 citation statements)

References 27 publications

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“…The contribution of the real part of the AERI corresponds to the high frequencies, whereas the contribution of the imaginary part of the AERI corresponds to the low frequencies, suggesting that the variances resulting from the real and imaginary parts are independent. Therefore, the light intensity variances induced by the real and imaginary parts can be detected separately at high frequencies and low frequencies from the LAS measurements (Yuan et al, 2015). The real part of the AERISP (C 2 n, Re ) can be calculated from the variance of the high-frequency part, and the imaginary part of the AERISP (C 2 n, Im ) can be calculated from the variance of the low-frequency part.…”

Section: R M Yuan Et Al: a New Methods For Estimating Aerosol Mass mentioning

confidence: 99%

“…C 2 n, Re and C 2 n, Im can be measured by a specially made LAS (Yuan et al, 2015). After a spherical wave propagates over a distance in a turbulent atmosphere, the light intensity on the receiving end will fluctuate.…”

Section: R M Yuan Et Al: a New Methods For Estimating Aerosol Mass mentioning

confidence: 99%

“…(6)- (7) can be derived from the real and imaginary parts of the AERISP as C 2 n, Re and C 2 n, Im , respectively (Yuan et al, 2015). The real part of the AERI (n Re ) for a visible optical wave is (Hill, 1978):…”

Section: Measurement Methodsmentioning

confidence: 99%

“…The electrical signals were demodulated and amplified by an amplifier. More details about our LAS can be found in the previous paper of Yuan et al (2015).…”

Section: Measurement and Data Processingmentioning

confidence: 99%

“…We recently measured the imaginary part of the AERISP based on the light-propagation theory (Yuan et al, 2015). The results showed that the imaginary parts of the AERISP were related to the turbulent transport process and the spatial distribution characteristics of aerosols.…”

Section: Introductionmentioning

confidence: 99%

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A new method for estimating aerosol mass flux in the urban surface layer using LAS technology

et al. 2016

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Abstract. Atmospheric aerosol greatly influences human health and the natural environment, as well as the weather and climate system. Therefore, atmospheric aerosol has attracted significant attention from society. Despite consistent research efforts, there are still uncertainties in understanding its effects due to poor knowledge about aerosol vertical transport caused by the limited measurement capabilities of aerosol mass vertical transport flux. In this paper, a new method for measuring atmospheric aerosol vertical transport flux is developed based on the similarity theory of surface layer, the theory of light propagation in a turbulent atmosphere, and the observations and studies of the atmospheric equivalent refractive index (AERI). The results show that aerosol mass flux can be linked to the real and imaginary parts of the atmospheric equivalent refractive index structure parameter (AERISP) and the ratio of aerosol mass concentration to the imaginary part of the AERI. The real and imaginary parts of the AERISP can be measured based on the lightpropagation theory. The ratio of the aerosol mass concentration to the imaginary part of the AERI can be measured based on the measurements of aerosol mass concentration and visibility. The observational results show that aerosol vertical transport flux varies diurnally and is related to the aerosol spatial distribution. The maximum aerosol flux during the experimental period in Hefei City was 0.017 mg m −2 s −1 , and the mean value was 0.004 mg m −2 s −1 . The new method offers an effective way to study aerosol vertical transport in complex environments.

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Section: R M Yuan Et Al: a New Methods For Estimating Aerosol Mass mentioning

confidence: 99%

Section: R M Yuan Et Al: a New Methods For Estimating Aerosol Mass mentioning

confidence: 99%

Section: Measurement Methodsmentioning

confidence: 99%

“…The electrical signals were demodulated and amplified by an amplifier. More details about our LAS can be found in the previous paper of Yuan et al (2015).…”

Section: Measurement and Data Processingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A new method for estimating aerosol mass flux in the urban surface layer using LAS technology

et al. 2016

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Forecasting surface-layer optical turbulence above the Tibetan Plateau using the WRF model

Yang¹,

Wu²,

Luo³

et al. 2022

Optics & Laser Technology

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Scintillometry in urban and complex environments: a review

Ward

2017

Meas. Sci. Technol.

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Knowledge of turbulent exchange in complex environments is relevant to a wide range of hydrometeorological applications. Observations are required to improve understanding and inform model parameterisations but the very nature of complex environments presents challenges for measurements. Scintillometry offers several advantages as a technique for providing spatiallyintegrated turbulence data (structure parameters and fluxes), particularly in areas that would be impracticable to monitor using eddy covariance, such as across a valley, above a city or over heterogeneous landscapes. Despite much of scintillometry theory assuming flat, homogeneous surfaces and ideal conditions, over the last 20 years scintillometers have been deployed in increasingly complex locations, including urban and mountainous areas. This review draws together fundamental and applied research in complex environments, to assess what has been learnt, summarise the stateof-the-art and identify key areas for future research. Particular attention is given to evidence, or relative lack thereof, of the impact of complex environments on scintillometer data. Practical and theoretical considerations to account for the effects of complexity are discussed, with the aim of developing measurement capability towards more reliable and accurate observations in future. The usefulness of structure parameter measurements (in addition to fluxes, which must be derived using similarity theory) should not be overlooked, particularly when comparing or combining scintillometry with other measurement techniques and model simulations.

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A new method for measuring the imaginary part of the atmospheric refractive index structure parameter in the urban surface layer

Cited by 10 publications

References 27 publications

A new method for estimating aerosol mass flux in the urban surface layer using LAS technology

A new method for estimating aerosol mass flux in the urban surface layer using LAS technology

Forecasting surface-layer optical turbulence above the Tibetan Plateau using the WRF model

Scintillometry in urban and complex environments: a review

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