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- Title
A simulation study on the recirculation effect of land–sea breeze flows on atmospheric dispersion of airborne releases in Southeast coast of India.
- Authors
Reddy, B. Revanth; Srinivas, C. V.; Venkatraman, B.
- Abstract
This study aims to examine the recirculation effect of land and sea breeze flows on atmospheric releases from Chennai and Kalpakkam stations in Southeast coast of India using the WRF and FLEXPART models. High-resolution (2 km) simulations conducted with WRF for 4–6 April 2016 and 13–16 July 2016 showed development of sea breeze circulation under strong land–sea temperature contrast across the coast during daytime. Simulations conducted with FLEXPART in two scenarios of (1) 24 h continuous release, (2) release during sea breeze hours for SO2 from industrial sources at Manali in Chennai and routine low-level Ar-41 from a nuclear power reactor at Kalpakkam stations for 5 April and 14 July indicated considerable differences in SO2/Ar-41 concentrations in the two simulation cases. The simulated plume for 24 h release case showed wide dispersion pattern during flow transition compared to the case in which release is confined to onshore sea breeze hours. The recirculation effect is confirmed from low recirculation factor (0.1–0.3), simulated plume trajectory and particle distributions in the 24 h release case. The simulated SO2 concentrations are about 21 µg/m3 to 2 µg/m3 higher from release location to ~ 20 km in the 24 h release case compared to the release case during sea breeze. Simulated SO2 and Ar-41 concentration/doses at monitor locations during the flow transition period indicated better comparison with monitor data by 24-h release case compared to the release case during sea breeze. Although both simulations underestimated the concentration/dose due to stronger simulated winds, the 24 h release case produced higher concentration/cloud gamma dose by representing the recirculation effect. Overall, simulations suggest that the recirculation effect can lead to increase in the concentration /dose over land by 40% during the wind transition period at the coast.
- Publication
Meteorology & Atmospheric Physics, 2023, Vol 135, Issue 5, p1
- ISSN
0177-7971
- Publication type
Article
- DOI
10.1007/s00703-023-00983-0