This study reports a very high-resolution (400 m grid-spacing) operational air quality forecasting system developed to alert residents of Delhi and the National Capital Region (NCR) about forthcoming acute air pollution episodes.
The forecast found to be very skillful both for PM2.5 concentration and unhealthy/ very unhealthy air quality index categories, and has been helping the decision-makers in Delhi make informed decisions.
(Jena C., Ghude S.D., Kumar Rajesh, Debnath S., Govardhan G., Soni V.K., Kulkarni S.H., Beig G., Nanjundiah R.S., Rajeevan M., Scientific Reports, 11: 4104, February 2021, DOI:10.1038/s41598-021-83467-8, 1-9)Read More
Paper presents a hypothesis that the Asian summer monsoon dynamics of delayed withdrawal time and associated vagarious anti-cyclonic circulation plays a lead role in enhancing the frequency of extreme pollution events by triggering rapid particulate formation and trapping them ceaselessly.
SAFAR-forecasting model explains that how stagnation conditions created by changing circulation pattern in late withdrawal years of 2016 and 2017 in Delhi during the past 5 years witnessed PM2.5 extremes immediately after the monsoon retreat.
Present findings suggest that such unusual monsoon patterns are on the hook to spur extreme pollution events in recent time.
(Beig G., Rathod Aditi, Tikle S., Maji Sujit, Sobhana S.B., Journal of Environmental Sciences, 106, August 2021, DOI:0.1016/j.jes.2021.01.004, 97-104)Read More
First of its kind, this study clearly portrays inter-seasonal relationship between morphology of clouds, microphysics of precipitation& occurrences of lightning by synergetic use of data from S-band DWR, Disdrometer & Maharashtra Lightning Detection Network Mumbai. Findings & observations will be helpful to aid heavy rainfall research over urban coastal cities, particularly in the Indian monsoon regions, to advance science in the benefit of the society - which is also one of the important objectives of MoES.
(Chakravarty K., Gayathridevi S., Mohmmad J., Hosalikar K.S., Pandithurai G., Niyogi D., Natural Hazards, Online, March 2021, DOI:10.1007/s11069-021-04637-5, 1-14)Read More
This study investigated the characteristics of secondary inorganic aerosols at a highly polluted urban environment of Delhi, and their impacts at a downwind semi-urban site, Gual Pahari, in the north-west IGB. The major water-soluble inorganic species were abundant at Gual Pahari as compared to Delhi whereas the major crustal species were abundant at Delhi as compared to Gual Pahari, which results a two-fold increase in atmospheric warming at Delhi due to dominant absorbing aerosols. The results highlight the diverse near-surface emissions together with atmospheric processing, which leads to strong inter-seasonal spatial heterogeneity in aerosol chemical, optical and radiative properties between the adjacent distinct sites, and has important implication for a city-scale air pollution modeling.
(Srivastava Atul K., Thomas A., Hooda R.K., Kanawade V.P., Hyvärinen A.-P., Bisht D.S., Tiwari Suresh, Atmospheric Environment, 248: 118246, March 2021, DOI:10.1016/j.atmosenv.2021.118246, 1-10)Read More
This study aims to discuss the process of spectral dispersion by the entrainment-mixing mechanisms. The entrainment of dry environmental air occurs at the lateral edges of convective clouds at a length scale of about 100–200 m, as reported in previous studies.
(Bera S., Journal of Atmospheric and Solar Terrestrial Physics, 214: 105550, March 2021, DOI:10.1016/j.jastp.2021.105550, 1-9)Read More