A numerical experiment to study the impact of temperature enhancement by anthropogenic heating on local weather at the Angul region of India

Mishra, Purna Chandra; Kannan, Srinivasa Ramanujam

doi:10.1007/s12040-021-01801-0

Cited by 7 publications

(11 citation statements)

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“…Again, the accurate estimation of anthropogenic heat and moisture is quite challenging. Therefore, numerical experimentation is carried out such that heat and moisture are added to the atmosphere by increasing the temperature by 10 K at the surface [10,21,56], with an exponential decrease up to the atmospheric boundary layer (~1 km). However, an increase in air temperature for the same amount of moisture results in reducing relative humidity.…”

Section: Description Of Numerical Experimentsmentioning

confidence: 99%

“…The values of temperature T 0 and relative humidity ∅ 0 are replaced with the perturbed temperature T 1 and the recalculated relative humidity ∅ 1 in the input file to WRF. Parameters of interest are rain rate (R) and median diameter (Do), which are calculated from the extracted value of rainwater mixing ratio (q r ) and water vapour mixing ratio (q v ) from the model simulation [56].…”

Section: Design Of Numerical Experimentsmentioning

confidence: 99%

“…Two rain events were selected for this study during the monsoon and summer season that occurred during 16 August 2008 and 22 March 2008, respectively. These dates were identified based on the earlier work by Mishra and Kannan [56]. Mishra and Kannan [56] compared the histogram of rainfall data observed by TRMM PR with simulated rainfall by WRF using different microphysics schemes, i.e., Kessler, WSM6 and WDM6.…”

Section: Validationmentioning

confidence: 99%

“…These dates were identified based on the earlier work by Mishra and Kannan [56]. Mishra and Kannan [56] compared the histogram of rainfall data observed by TRMM PR with simulated rainfall by WRF using different microphysics schemes, i.e., Kessler, WSM6 and WDM6. From the qualitative comparison it was observed that the rainfall distribution simulated using WDM6 matches closely with TRMM PR observations for both the rain events.…”

Section: Validationmentioning

confidence: 99%

“…The relative humidity is recalculated, corresponding to the perturbed temperature. O Finally, to compare the numerical experiment result against the case in which only the temperature alone is perturbed (Exp 2) based on an earlier study [56]. Since relative humidity is unchanged in this case, the water vapour content in the atmosphere would significantly increase.…”

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confidence: 99%

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The Effect of Anthropogenic Heat and Moisture on Local Weather at Industrial Heat Islands: A Numerical Experiment

2022

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The current study addresses the role of heat and moisture emitted from anthropogenic sources on the local weather with the aid of numerical weather prediction (NWP). The heat and moisture emitted by industries to the atmosphere are considered main sources in this study. In order to understand the effect of heat and moisture on local weather, the study is conducted to capture the impact of heat with no moisture change. The results are compared against a control run case without perturbation and also against the case where both heat and moisture are perturbed with temperature as a single parameter. The Angul district in Odisha that houses over 4000 industries is considered our study region. The numerical simulations are performed using the mesoscale Weather Research and Forecasting (WRF) model for two rain events, namely a light rain case and a heavy rain case, with different physics options available in the WRF model. The WRF simulated maximum rainfall rate using various microphysics schemes are compared with the Tropical rainfall measuring mission (TRMM) observations for validation purposes. Our study shows that the WDM6 double moment microphysics scheme is better in capturing rain events. The TRMM-validated WRF simulation is considered a reference state of the atmosphere against which comparisons for the perturbed case are made. The surface temperature is perturbed by increasing it by 10 K near the industrial site and exponentially decreasing it with height up to the atmospheric boundary layer. A numerical experiment represents heating without addition of moisture by recalculating the relative humidity (RH) corresponding to the perturbed temperature. The perturbed temperature affects sensible heat (SH) and latent heat (LH) parameters in the numerical experiment. From the results of the numerical investigation, it is found that the near-surface rainfall rate increases locally in a reasonable manner with the addition of sensible heat to the atmosphere. A comparison against the case where moisture is added shows that enhanced rainfall is more sensitive to sensible and latent heat than sensible heat alone.

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Section: Description Of Numerical Experimentsmentioning

confidence: 99%

Section: Design Of Numerical Experimentsmentioning

confidence: 99%