Study of Oxides and aerosols in connection with COVID 19 lockdown scenario over a Metropolitan City, Kolkata

In this paper, the variation of oxides, aerosols and atmospheric parameters have been investigated before, during and after the lockdown period due to COVID 19 over Kolkata, a populated metropolitan city. Major reductions have been observed for CO, SO 2 and AOD especially at the beginning month of the lockdown period. The lower value of SO 2 are reflected in the minima of AOD which further result in a marked reduction in the atmospheric instability. In addition, the temperature profiles depict atmospheric cooling at 700 hPa due to lockdown which is also believed to have some additional contribution on the observed CAPE reduction.