A Global Atmospheric Contaminant Transport Model Based on 3D Advection-Diffusion Equation

Zhang, Ting; Xu, Ning; Guo, Longfei; Huang, Yi; Bai, Yong

doi:10.7763/jocet.2014.v2.88

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…The logarithmic distribution of the wind speed and the exponential function form of the turbulent diffusivity were incorporated into the refined Equation . However, the turbulent diffusivity with its corresponding wind speed cannot be determined by directly using the kriging interpolation method (Zhang et al ., ):

V_{z} \frac{\partial C}{\partial z} = \frac{\partial}{\partial z} ((), K_{z} \frac{\partial C}{\partial z}) + \frac{\partial}{\partial y} ((), K_{y} \frac{\partial C}{\partial y}) + \frac{\partial}{\partial x} ((), K_{z} \frac{\partial C}{\partial x})

V_{x} \frac{\partial C}{\partial x} = \frac{\partial}{\partial y} ((), K_{y 2} \frac{\partial C}{\partial y}) + \frac{\partial}{\partial z} ((), K_{z 2} \frac{\partial C}{\partial z}) + \frac{\partial}{\partial x} ((), K_{z 2} \frac{\partial C}{\partial x})

…”

Section: Theoretical Background Of the Studymentioning

confidence: 99%

Documentation of atmospheric constants over Niamey, Niger: a theoretical aid for measuring instruments

Emetere

Akinyemi

2017

Meteorological Applications

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The frequent failures of ground measuring devices, e.g. radiosondes, weather stations, in developing regions is worrisome. From the literature, established projects such as the Aerosol Robotic Network (AERONET) and the African Monsoon Multidisciplinary Analyses (AMMA) are burdened by the same challenge. At the moment, the AERONET and AMMA databases show a large volume of data loss. With only about 47% of data available to scientists, it is evident that accurate nowcasts or forecasts cannot be guaranteed. It is proposed that the challenge is not measuring device design error but systemic, i.e. the configuration of accurate calibration constants in the compact flash card of the devices. The calibration constants of most radiosonde or weather stations are not compatible with the atmospheric conditions of the West African climate. A dispersion model was developed to incorporate salient mathematical representations such as the unified number. The unified number was derived to describe the turbulence of aerosol transport in the frictional layer of the lower atmosphere. A 14 year dataset from the Multi-angle Imaging SpectroRadiometer was tested using the dispersion model. A yearly estimation of the atmospheric constants over Niamey using the model was obtained with about 87.5% accuracy. This further revealed that the average atmospheric constants for Niamey, Niger, are a 1 = 0.77975 and a 2 = 0.693021 and the tuning constants are n 1 = 0.140187 and n 2 = 0.759236. Also, the yearly atmospheric constants confirmed that the lower atmosphere of Niamey is very dynamic. Hence, it is recommended that radiosonde and weather station manufacturers should constantly review the atmospheric constants over a geographical location to enable about 80% data retrieval.

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V_{z} \frac{\partial C}{\partial z} = \frac{\partial}{\partial z} ((), K_{z} \frac{\partial C}{\partial z}) + \frac{\partial}{\partial y} ((), K_{y} \frac{\partial C}{\partial y}) + \frac{\partial}{\partial x} ((), K_{z} \frac{\partial C}{\partial x})

V_{x} \frac{\partial C}{\partial x} = \frac{\partial}{\partial y} ((), K_{y 2} \frac{\partial C}{\partial y}) + \frac{\partial}{\partial z} ((), K_{z 2} \frac{\partial C}{\partial z}) + \frac{\partial}{\partial x} ((), K_{z 2} \frac{\partial C}{\partial x})

…”

Section: Theoretical Background Of the Studymentioning

confidence: 99%

Documentation of atmospheric constants over Niamey, Niger: a theoretical aid for measuring instruments

Emetere

Akinyemi

2017

Meteorological Applications

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“…Here, V is the wind velocity (m/s), P is the air upthrust, x is the wind coordinate measured in wind direction from the source, y is the cross-wind coordinate direction, z is the vertical coordinate measured from the ground, C(x,y,z) is the mean concentration of diffusing pollutants of diffusing substance at a point (x,y,z) [kg/m 3 ], Ky, Kz is the eddy diffusivities in the direction of the y-and z-axes [m 2 /s], S is the source/sink term [kg/m 3 -s]. Zhang et al (2014) adopted Eq. 7but represented lc ¼ ÀP þ S. Where l is the climatic factor and c is contaminant concentration.…”

Section: Theory: the Concept Of The Aerosol Dispersion Plume Modelmentioning

confidence: 99%

Parametric retrieval model for estimating aerosol size distribution via the AERONET, LAGOS station

Emetere

Akinyemi

Akin-Ojo

2015

Environmental Pollution

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The size characteristics of atmospheric aerosol over the tropical region of Lagos, Southern Nigeria were investigated using two years of continuous spectral aerosol optical depth measurements via the AERONET station for four major bands i.e. blue, green, red and infrared. Lagos lies within the latitude of 6.465°N and longitude of 3.406°E. Few systems of dispersion model was derived upon specified conditions to solve challenges on aerosols size distribution within the Stokes regime. The dispersion model was adopted to derive an aerosol size distribution (ASD) model which is in perfect agreement with existing model. The parametric nature of the formulated ASD model shows the independence of each band to determine the ASD over an area. The turbulence flow of particulates over the area was analyzed using the unified number (Un). A comparative study via the aid of the Davis automatic weather station was carried out on the Reynolds number, Knudsen number and the Unified number. The Reynolds and Unified number were more accurate to describe the atmospheric fields of the location. The aerosols loading trend in January to March (JFM) and August to October (ASO) shows a yearly 15% retention of aerosols in the atmosphere. The effect of the yearly aerosol retention can be seen to partly influence the aerosol loadings between October and February.

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Introduction to Environmental Modelling

Emetere

2019

Studies in Big Data

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A Global Atmospheric Contaminant Transport Model Based on 3D Advection-Diffusion Equation

Cited by 3 publications

References 2 publications

Documentation of atmospheric constants over Niamey, Niger: a theoretical aid for measuring instruments

Documentation of atmospheric constants over Niamey, Niger: a theoretical aid for measuring instruments

Parametric retrieval model for estimating aerosol size distribution via the AERONET, LAGOS station

Introduction to Environmental Modelling

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