Showing papers by "Animesh Maitra published in 2015"
TL;DR: In this paper, the performances of three instruments namely, Joss-Waldvogel disdrometer, laser precipitation monitor and micro rain radar, are assessed in terms of their ability to measure rain related parameters and to better understand the dependency of measured parameters on the working principles of the instruments.
35 citations
TL;DR: In this paper, near surface aerosol black carbon (BC) concentration data were collected using a seven channel Aethalometer (AE31) during June 2012-May 2013 in Kolkata (22° 34′E, 88° 22′N), a metropolitan city located near the land-ocean boundary in Eastern India.
33 citations
TL;DR: In this paper, a long-term observation (1979-2008) of the increase in convective precipitation in relation to the latent and sensible heat fluxes on a tropical location, Kolkata, has been investigated in the present study.
22 citations
TL;DR: In this article, a rain attenuation prediction method has been applied to different climatic regions to test the validity of the model and the significant difference in rain rate and attenuation statistics for the tropical and temperate region needs to be considered in developing channel model to predict time series of rain attenuated for earth space communication links.
11 citations
TL;DR: In this paper, a ground-based radiometer has been utilized to study the characteristics of tropospheric delay and compared it with the MODIS satellite observations over Kolkata (22.57°N, 88.37°E).
5 citations
01 Jan 2015
TL;DR: In this article, the vertical profile of the precipitation structure under varying propagation and rain conditions was studied using the radar data from the space and the ground to study the vertical profiles of radar reflectivity and rain rate, indicating the limitations of combining space based and ground based measurements.
Abstract: Simultaneous radar measurements of rain from the space and the ground are presented to study the vertical profile of the precipitation structure under varying propagation and raining conditions. The measurements used for this study are the Precipitation Radar (PR) aboard Tropical Rainfall Measuring Mission (TRMM) satellite and a ground based Micro Rain Radar (MRR) operating at the University of Calcutta. The dual frequency radar observations of precipitating atmosphere have been utilized to study the vertical profiles of radar reflectivity and rain rate, indicating the limitations of combining space based and ground based measurements.
2 citations
01 Jan 2015
TL;DR: In this paper, a simple approach is taken to study rain attenuation at various frequencies from propagation data and ground-based radar measurements at Kolkata, India, using the ITU-R model and the SAM model to estimate the slant rain rate and total attenuation from the vertical rain rate profiles.
Abstract: Rain attenuation is an important aspect of signal propagation mainly above 10 GHz frequency. It has also been found that the rain rate and attenuation profiles along the vertical and slant propagation path, especially at a higher rain rates and at tropical location. In this study, a simple approach is taken to study rain attenuation at various frequencies from propagation data and ground based radar measurements at Kolkata, INDIA. The ITU-R Model and the SAM Model has been utilized to provide an estimate of the slant rain rate and total attenuation from the vertical rain rate profiles.
2 citations
1 citations
01 Jan 2015
TL;DR: In this article, the rain phases have been classified into stratiform and convective on the basis of bright band signature in the rain rate profile of the micro rain radar and the rain drop size distributions exhibit distinguishable variations for the two types of rain.
Abstract: Tropical region experiences a variety of rainfall types throughout the year. The rain can vary from stratiform to convective even within a single event. The rain parameters have been separately investigated for stratiform and convective cases. The rain phases have been classified into stratiform and convective on the basis of bright band signature in the rain rate profile of the micro rain radar. The rain drop size distributions exhibit discernible difference for stratiform and convective cases. The drop size distribution parameters consequently demonstrate distinguishable variations for the two types of rain.
01 Feb 2015
TL;DR: In this article, the probability density functions of measured fade slope for a tropical location are analyzed and found to be very close to Van De Kamp distribution model, and cumulative distributions of the measured fade slopes closely follow ITU-R model.
Abstract: Probability density functions of measured fade slope for a tropical location are analyzed and found to very close to Van De Kamp distribution model. Cumulative distributions of the measured fade slope closely follows ITU-R model. The fade-slope technique is adopted to predict time series of rain attenuation of Ku band signal during rain events for the tropical location. A good matching is obtained between measured and predicted attenuations.