Atmospheric convection caused by temperature dispersion in and around the industrial source and its effect on precipitation rate: Gaussian approach
Abstract
Global warming and unusual rainfall are significant consequences of man-made activities and have been a hot research topic since the last century. Industrial heat island (IHI) is a severe environmental issue due to industrial action over the industrial region, which may change the weather pattern. This intensity of IHI may cause an uplift of local heat flux and spread to the atmospheric planetary boundary layer (ABL), which is responsible for instability in the atmosphere. Together with ground surface heating, strong vertical convection and atmosphere instability indirectly influence the intensity of rainfall rate in the industrial area. Most of the earlier IHI-related studies are done by considering a source of heat as a point source. But in the most realistic scenario, heat added from any of the industrial sources is dispersed in horizontal and vertical directions. To disperse anthropogenic effluent from the source, various dispersion models have evolved depending on the complexity of the environment, scale of the system and different concentration parameters. In the present study dispersion model based on the Gaussian plume distribution approach is adopted to calculate temperature dispersion at the nearby industrial location and the same is applied as the input parameter to the numerical weather prediction model. The model simulation is validated with observation and act as control run against which other numerical experiments are compared. Numerical experiments are designed so that the surface level's temperature is perturbed near the industrial site and dispersed in the crosswind, downwind and vertical directions. The dispersed temperature increases in near-surface mixing and convection resulted in a significant change in the local weather leading to a shift in rainfall pattern. Due to temperature dispersion, enhanced rainfall is observed on a larger scale than point heat sources; however, the precipitation rate is more sensitive to the degree of temperature perturbation. These enhancement characteristics are observed locally at the downwind side of perturbation. Further, it is observed that anthropogenic heating with moisture change increased maximum rainfall compared to the control run. In contrast, only heating leads to a decrease in precipitation.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2022
- Bibcode:
- 2022AGUFM.A31D..06M