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

Yuan, Renmin; Luo, Tao; Sun, Jian; Liu, H.; Fu, Y. F.; Wang, Z.

doi:10.5194/amt-2015-301

Cited by 1 publication

(1 citation statement)

References 29 publications

(51 reference statements)

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“…The real part of the AERISP corresponds to the atmospheric temperature variation. Furthermore, it is assumed that the aerosol concentration variations follow the same pattern as the scalar motion, which is in line with the similar theory of the surface layer, and thus, the vertical transport flux of aerosol particles in the near-surface layer can be obtained by using the imaginary part of the AERISP (Yuan et al, 2016;Yuan et al, 2019). AERISP observations are carried out in many places, and then the aerosol flux is obtained by combining the similarity theory.…”

Section: Introductionmentioning

confidence: 78%

Comparison of the imaginary part of the atmospheric refractive index structure parameter and aerosol flux based on different measurement methods

Yuan,

Zhang,

Hua

et al. 2023

Preprint

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Abstract. The complexity of aerosol particle properties and the diversity of characterizations make aerosol vertical transport flux measurements and analysis difficult. Although there are different methods, such as aerosol particle number concentration flux and aerosol mass flux based on the eddy covariance principle, and aerosol mass flux measurements based on the light-propagated large-aperture scintillation principle, there is a lack of mutual validation among the different methods. In this paper, a comparison of aerosol mass flux measurements based on the eddy covariance principle and aerosol mass flux measurements based on the light-propagated large aperture scintillation principle is carried out. The key idea of aerosol mass flux measurements based on the light-propagated large-aperture scintillation principle is the determination of the imaginary part of the atmospheric equivalent refractive index structure parameter (AERISP). In this paper, we will first compare the AERISPs measured by two different methods and then compare the aerosol mass vertical transport fluxes obtained by different methods. The experiments were conducted on the campus of the University of Science and Technology of China (USTC). The light propagation experiment was carried out between two tall buildings to obtain the imaginary and real parts of AERISPs for the whole path, which in turn can be used to obtain the aerosol vertical transport flux. An updated visibility meter is installed on the meteorological tower in the middle of the light path, which is utilized to obtain the single-point visibility, which is then converted to the imaginary part of the atmospheric equivalent refractive index (AERI). The imaginary parts of the AERISP were obtained using spectral analysis with visibility data. The results show that the imaginary parts of the AERISPs obtained by different methods are in good agreement. The imaginary part of the AERI measured by the visibility meter and the vertical wind speed obtained by the ultrasonic anemometer were used for covariance calculation to obtain the aerosol vertical transport flux. The trends of aerosol vertical transport fluxes obtained by different methods are consistent, and there are differences in some details, which may be caused by the inhomogeneity of the vertical transport of aerosol fluxes. The experimental results also show that urban green land is a sink area for aerosol particles.

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Section: Introductionmentioning

confidence: 78%