c0040f1e-29c4-4a91-b264-c37a4f9af878 eng utf8 dataset pointOfContact National Centre for Polar and Ocean Research (NCPOR) +91-832-2525515 voice Headland Sada, Vasco da Gama, Goa 403804 Vasco-da-Gama Goa 403804 IND vssamy@ncpor.res.in Mr. Sakthivel Samy V 2021-01-29T00:00:00 creation ISO 19115-1 Geographic information - Metadata - Part 1: Fundamentals ISO 19115-1:2014 Boundary Layer Studies by Acoustic Sounder at Indian Antarctic Station Maitri. 2020-09-11T00:00:00 creation Document digital An acoustic sounder system designed and developed at NPL was installed at Maitri in austral summer of 1991. This instrument consists of a low' power audio frequency generator, transmitting tone burst vertically up in the air and receving the weak echo returning from atmospheric irregularities and recording them on facsimile recorder/ digital printer. Among the various types of structures observed by the acoustic sounder, were the echo patterns, representing ground based inversions and variable structures on the surface of the inversion layer, throwing light on the nature of planetary boundary layer. The Acoustic Sounder is a remote sensing tool to probe the atmosphere. It can give real time values of the structure parameters as can be obtained by meteorological tower and aircraft techniques. The system is capable of monitoring the structure turbulent boundary layer. It provides an inexpensive method to probe the complete dynamics which is represented in a simple picture form for various practical applications. Gilman et al, (1946) were the first to use the acoustic sounder in studies of signal fadings in the troposcatter trans-horizon microwave radio link over the 64 km distance between New York and New Jersey. A correlation between microwave radio fadings and the structure parameter obtained by the acoustic sounder was reported. During mid 60s, Mc Allister (1968) re-discovered the potential use of the acoustic scattered intensity from the atmosphere due to fluctuations in the wind velocity and temperature. completed principalInvestigator National Centre for Polar and Ocean Research (NCPOR) 8322525515 voice Headland Sada, Vasco da Gama, Goa 403804 Vasco-da-Gama Goa 403804 IND ictd@ncpor.res.in Dr. A K Hanjura boundaries 20.0 140.0 -90.0 30.0 1990-01-01 1991-12-31 Earth Science-Human Dimensions Theme Maitri Antarctic Place Boundary Layer Studies by Acoustic Sounder at Indian Antarctic Station Maitri Project eng TableDigital unknown unknown unknown distributor National Centre for Polar and Ocean Research (NCPOR) +91-832-2525515 voice Headland Sada, Vasco da Gama, Goa 403804 Vasco-da-Gama Goa 403804 IND vssamy@ncpor.res.in Mr. Sakthivel Samy V http://npdc.ncaor.gov.in/npdc/search_mf_data.action?search=freeText&expedition_type=all&parameter=MF2073870410&userType=user&freeTextValue=Boundary+Layer+Studies+by+Acoustic+Sounder+at+Indian+Antarctic+Station+Maitri.