Computational study of temperature and density perturbations on atmospheric dynamics

Admasu, Abawari,; Elfaged, Yitagesu

doi:10.1088/2399-6528/acaa89

Cited by 2 publications

(10 citation statements)

References 31 publications

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“…For the purposes of the current work, we consider the atmosphere to be a neutral, compressible, and saturated moist air (cannot be supersaturated) moving in the rotating Earth's frame. Due to a different activities such as a volcanic eruption, large scale wild fire of forest, large scale heat releasing activities in town that was discussed in our preceding works [1], there was uncertainty of a moist air temperature that was induced at a particular location of the atmosphere (see, section 4).…”

Section: The Theoretical Modelmentioning

confidence: 99%

“…The dissipation function resulting from the viscous force on the air parcel (Φ) can be expressed as the double dot product of the stress tensors (σ ik ) and ( v    ) [1]. Thus, by employing a tensor identity, Φ can be expressed as:…”

Section: Conservation Of Energy Of Air Parcelmentioning

confidence: 99%

“…For this specific work, the equilibrium temperature T mo (λ, f, z) of the saturated moist air was obtained by solving equation (3) that varies with only the spatial variables f and z but don't change with longitude λ and time t. The overall atmospheric model simulation processes for this specific work are described by the partial differential equations ( 16), ( 18), (23),and the ideal gas relation (14). By numerically computing those equations with the use of the finite difference method (FDM) [1] on an unstragered grid cell, key atmospheric parameters that responded to the temperature perturbation were extracted at a specific longitude and elevation above the Earth's surface. The middle troposphere, which is situated below 7 km and within the latitude range of 9 o N to 15 o N and the longitude range of 35 o E to 45 o E, is the domain size employed in the numerical computation.…”

Section: Numerical Analysismentioning

confidence: 99%

“…As a result, clouds and precipitations have a significant modulating effect on weather and climate scales [27][28][29][30][31]. Without considering the interaction of the atmosphere with various surfaces, the numerical computation of the perturbation effect of temperature and moist air density on lower atmospheric dynamics was done [1]. The findings showed that every variable responded to the dynamics of the atmosphere in a plane wave pattern, with specific heat capacities, resulting wind speed, and water vapor mixing ratio increasing over time at each latitude, while vertical wind speed, specific enthalpy, and pressure decreased over time at each latitude.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous work [1], we treated the atmosphere as unsaturated moist air, meaning that it simply consists of the components of gas and vapor water. But the main sources of uncertainty in weather forecasting are clouds and precipitation [32][33][34] and their influence on the saturated atmosphere's large-scale dynamics was not taken into account by the model.…”

Section: Introductionmentioning

confidence: 99%

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Influence of temperature perturbation on moisture dynamics

Abawari,

Elfaged

2024

J. Phys. Commun.

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We analyzed the perturbation effect of temperature on the moisture content in the atmosphere,considering the saturation phenomenon. The air parcels of a saturated atmosphere are made of dry air, vapor, cloud, and rain water that ﬂow on a rotating Earth, with a temperature perturbations induced at 9o1′48”N, 38o44′24”E and 6.324km above the Earth’s surface. The fundamental atmospheric parameter of this saturated moist air was treated as temperature-dependent, and the pressure force exerted on it by the precipitation and cloud water is not considered in the numerical computation. In this proposed research, the initial value of wind speed along zonal, meridional, and vertical directions varies with elevation, and the interaction of the atmosphere with the Earth’s surface is not neglected. The result of the investigation revealed that a single tropospheric disturbance of an atmospheric variable is a major factor in the spread of different long period waves patterns (350 hours) and this atmospheric oscillations play a crucial role in transferring energy, momentum, and mass across different parts of the atmosphere, impacting global climate systems.

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Section: The Theoretical Modelmentioning

confidence: 99%

Section: Conservation Of Energy Of Air Parcelmentioning

confidence: 99%

Section: Numerical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of temperature perturbation on moisture dynamics

Abawari,

Elfaged

2024

J. Phys. Commun.

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Impacts of some meteorological parameters on the characteristics of air quality over Ethiopia

Abawari,

Elfaged

2024

J. Phys. Commun.

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This study was conducted to evaluate the impacts of some meteorological parameters (air temperature, wind speed, air pressure, albedo, specific humidity, surface incoming shortwave flux) on the concentrations of the major pollutants, including O$_{3}$, PM$_{2.5}$, CO, and SO$_{2}$, at the randomly sampled sites of Ethiopia in the year 2023 on the basis of an hour of observation. The study data were recorded on the surface of ground with $\Delta$t = 1hr, $\Delta$$\phi$ = 0.5$^{0}$, and $\Delta$$\lambda$ = 0.625$^{0}$ resolution that is available at Giovanni website\cite{Ronald,articlej}. The resulting mean hourly data of the trace gas's at each season was analyzed using time series via the Gnuplot package, and its relationship with the various meteorological elements was done by a statistical analysis using the Python programming language. Due to a variety of emission sources and meteorological factors, the pattern of main air pollutants in the selected regions of Ethiopia shifts over time with distinct wave patterns. Even in the sparse populations area of Ethiopia, the highest average concentrations of O$_{3}$ $\gg$ 120$\mu$g/m$^{3}$ were reported throughout the year during the summer months when solar radiation intensity was at its highest. The maximum PM$_{2.5}$ levels that exceeded the nation's available daily air quality criteria were also observed at EER, CER, and WER sampling sites during the autumn (163.15$\mu$g/m$^{3}$), summer (139.75$\mu$g/m$^{3}$), and winter (117.00$\mu$g/m$^{3}$), respectively. In the EER and WER sites, seasonal fires for an agricultural activities were shown to be the primary source of SO$_{2}$ and CO, whereas the major hotspots for those pollutants at the CER site were found to be higher traffic flow, fossil fuel combustion, and the impact of the great rift valley. From this result, it is vital to create and implement emission control programs to minimize those pollutants at each of the sampling site in Ethiopia. 

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Computational study of temperature and density perturbations on atmospheric dynamics

Cited by 2 publications

References 31 publications

Influence of temperature perturbation on moisture dynamics

Influence of temperature perturbation on moisture dynamics

Impacts of some meteorological parameters on the characteristics of air quality over Ethiopia

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