Current study investigates the impact of changes in land use/land cover (Lu/Lc) on thunderstorm, the short lived convective event occurred in New Delhi. We are trying to understand the impact of urban Lu/Lc changes on the structure and evolution of severe thunderstorm activities over a short time period. Lu/Lc data from IGBP are available for the period 1992-1993 and recent period 2012-2013 Lu/Lc data are from the ISRO AWiFS satellite sensor. We have used a cloud resolving model at 1.5 km resolution embedded within a coarser resolution global model at 17 km resolution. These configurations of models are based on UK Met Office Unified Model. Recent period Lu/Lc shows an increase in urban build up and increase in bare soil fraction over Delhi region. Our result shows that the Lu/LC change can impact the low level wind and thermodynamic structure of the storm.
Representation of rainfall distribution and monsoon circulation in the high resolution versions of NCMRWF Unified model (NCUM-REG) for the short-range forecasting of extreme rainfall event is vastly dependent on the key factors such as vertical cloud distribution, convection and convection/cloud relationship in the model. Hence it is highly relevant to evaluate the vertical structure of cloud and precipitation of the model over the monsoon environment. In this regard, we utilized the synergy of the capabilities of CloudSat data for long observational period, by conditioning it for the synoptic situation of the model simulation period. Simulations were run at 4-km grid length with the convective parameterization effectively switched off and on. Since the sample of CloudSat overpasses through the monsoon domain is small, the aforementioned methodology may qualitatively evaluate the vertical cloud structure for the model simulation period. It is envisaged that the present study will open up the possibility of further improvement in the high resolution version of NCUM in the tropics for the Indian summer monsoon associated rainfall events.