4e6f14e7-4cee-4dad-924a-7e7a5349efc2 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 2020-12-14T00:00:00 creation ISO 19115-1 Geographic information - Metadata - Part 1: Fundamentals ISO 19115-1:2014 Surface Ice Flow Velocity and Tide Retrieval of the Nivlisen Ice Shelf from GPS Observations. 2020-10-05T00:00:00 creation Document digital Using a Global Positioning System (GPS) receiver, 19 days of continuous GPS data were collected from January 23 to February 10, during the austral summer of 2005, in the frontal zone of Nivlisen ice shelf (NIS) of central Dronning Maud Land (cDML), East Antarctica. GPS data were analyzed to estimate the diurnal and semi-diurnal variations. We constrained the shelf DG GPS site co-ordinates with the base station MAITRI set up at Schirmacher Oasis and nearby International GNNS Service (IGS) stations. The Ice shelf motion in both cases was caused by a combination of ocean tidal effect, wind stress and ocean currents. The estimated horizontal velocity at DG GPS site was 0.72 m/day towards north-north-east with an azimuth of 20.27o. Major constituents of the oceanic tide have been delineated subjecting the hourly time series data (for five days) to Fast Fourier Transform (FFT) analysis. The amplitudes of the diurnal and semi diurnal were ~1.25 m and 0.5 m, respectively. The result showed not only the expected vertical tidal displacement but also a significant variation in the horizontal velocity. The maximum forward velocity occurred about 3-4 hours after the maximum tidal height, a phase relationship that suggests the role of ocean currents also as one of the driving forces for the ice shelf movement. Furthermore, this type of precise observations of diurnal and semi-diurnal tidal constituents can be assimilated in tide models. 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. P S Sunil 20.0 140.0 -90.0 30.0 2004-01-01 2005-12-31 Earth Science-Solid Earth Theme Part of cDML Antarctic Place Surface Ice Flow Velocity and Tide Retrieval of the Nivlisen Ice Shelf from GPS Observations 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.ncpor.res.in/npdc/search_mf_data.action?search=freeText&expedition_type=all&parameter=MF1343355842&userType=user&freeTextValue=Surface+Ice+Flow+Velocity+and+Tide+Retrieval+of+the+Nivlisen+Ice+Shelf+from+GPS+Observations.