Speaker
Description
Clouds occur both horizontally and vertically and are one of the most significant atmospheric constituents which play a vital role in the alteration of meteorological phenomena in a region. They can alter the climate by trapping the emitted longwave radiation from the earth, which warms the environment or by reflecting back the incoming solar radiation into space, cooling the atmosphere. Dibrugarh (27.47°N, 94.91°E, 111 m amsl), one of the northeastern locations in India is known for its varied weather conditions due to the topography, proximity to huge water bodies and the Himalayan region. Clouds are found in abundance in this region and thus there arises a necessity to study its behaviour pertaining to its effect on the climate. Although cloud studies are available in this region using satellite data, the in-situ observation is limited. Vaisala Ceilometer CL31 is one such remote sensing in-situ instrument which is being used to measure cloud base height at three cloud bases over Dibrugarh. The updraft and the downdraft of the cloud layers have also been observed with this instrument on some particular days. Besides these, the precipitation events can also be identified. The measured CBHs are used further to validate Sentinel-5P NRTI satellite observation.
