Sand-dust aerosol turbulence flux measurement system and measurement method thereof

A technology of measurement system and measurement method, which is applied in the field of air pollution meteorology, can solve the problems that the eddy correlation method cannot be used to calculate the turbulent flow of sand and dust aerosols, etc., and achieve mature observation data processing, strong implementability, and improved The effect of the signal-to-noise ratio

Inactive Publication Date: 2019-04-16
PEKING UNIV
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Problems solved by technology

Since there is no instrument that directly obtains the high-frequency data of the mass concentration of du...

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  • Sand-dust aerosol turbulence flux measurement system and measurement method thereof
  • Sand-dust aerosol turbulence flux measurement system and measurement method thereof
  • Sand-dust aerosol turbulence flux measurement system and measurement method thereof

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Embodiment Construction

[0035] The present invention will be further elaborated below through specific embodiments in conjunction with the accompanying drawings.

[0036] figure 1 Visibility and PM at different relative humidity RH are given 10 concentration relationship.

[0037] Take a typical sandstorm event that occurred on April 26, 2018 as an example. This sandstorm event occurred on April 26, 2018, and lasted for 6 and a half hours from 10:00 am to 15:30. figure 2 (a) shown. Such as figure 2 As shown in (b), during this dust process, the visibility value and PM 10There is a very good non-linear correlation of concentrations, although there are two distinct phases, where the open dots (dashed lines) represent phases in which both the mass concentration of dust aerosols at 3 m and the turbulent flux of dust aerosols increase with time; the solid dots The point (solid line) represents the stage in which the mass concentration of sand and dust aerosols at 3 m decreases with the increase of ...

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Abstract

The invention discloses a sand-dust aerosol turbulence flux measurement system and a measurement method thereof. According to the measurement system and the measurement method, a white light source isadopted in an emitter of an extinction coefficient measuring instrument, and the signal-to-noise ratio of the instrument is improved; and a periodically-rotating light chopper is arranged in front ofthe light source, and a difference of scattering extinction coefficients of adjacent sampling points is obtained, and the scattering extinction coefficient of outside noise is eliminated; by increasing the sampling frequency of the extinction coefficient measuring instrument, the high-frequency aerosol scattering extinction coefficient is obtained, and the sand-dust aerosol turbulent flux under the condition of strong dust is obtained; according to the measurement system and the measurement method, the sampling frequency of the extinction coefficient measuring instrument is improved, so thatthe requirement for calculating the turbulent flux is improved; an eddy-correlation technique is used for determining the sand-dust aerosol turbulence flux, the problem about obtaining of mass concentration pulsation and the turbulence flux of sand-dust aerosol is solved for the first time, and the basis is provided for the forecast mode; and in addition, operation is simple, the implementation isstrong, mating with an existing water-heat flux observation system can be achieved, or an observation system can be formed separately, and observation data processing is mature.

Description

technical field [0001] The invention belongs to the field of air pollution meteorology, and in particular relates to a measurement system and a measurement method for the turbulent flux of dust aerosol. Background technique [0002] In atmospheric detection, the extinction coefficient measuring instrument obtains the extinction coefficient by measuring the scattered light intensity, and the extinction coefficient measuring instrument is designed by the principle of forward scattering. There is a proportional relationship between the dust mass concentration γ and the output voltage value of the dust detection system under certain conditions. The transmitter of the extinction coefficient measuring instrument emits infrared rays, and the receiver measures the scattered light intensity of the atmosphere in the sampling volume, and the extinction coefficient can be calculated effectively through the scattered light intensity. Limited by measurement accuracy, the extinction coeff...

Claims

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Application Information

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IPC IPC(8): G01N21/47
CPCG01N21/4785
Inventor 鞠婷婷张宏昇任燕康凌蔡旭辉宋宇高迎鹏王鹏飞
Owner PEKING UNIV
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