Surface Ice Flow Velocity and Tide Retrieval of the Nivlisen Ice Shelf from GPS Observations.

Access URI: 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.

Brief Description (Abstract):

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.

Status: Completed

Purpose: 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.

Presentation Format: Documentdigital

Distribution Format: unknown

Distribution Format Version: unknown

Supplemental Information:

TableDigital

Keyword(s): Earth Science-Solid Earth,

Place/Location(s): Part of cDML, Antarctic,

Project: Surface Ice Flow Velocity and Tide Retrieval of the Nivlisen Ice Shelf from GPS Observations,

Topic Category(s): GeoScientific Information,

Date(s): 2020-10-05 (Creation),

Resource Contact(s):
1. Name : Dr. P S Sunil
    Role : PrincipalInvestigator
    Phone : 8322525515
    E-Mail : ictd [ at ] ncpor.res.in
    Organization Name : National Centre for Polar and Ocean Research (NCPOR)
    Address : Headland Sada, Vasco da Gama, Goa 403804
    City : Vasco-da-Gama
    State : Goa
    Postal Code : 403804
    Country : IND

Distributor Contact(s):
1. Name : Mr. Sakthivel Samy V
    Role : Distributor
    Phone : +91-832-2525515
    E-Mail : vssamy [ at ] ncpor.res.in
    Organization Name : National Centre for Polar and Ocean Research (NCPOR)
    Address : Headland Sada, Vasco da Gama, Goa 403804
    City : Vasco-da-Gama
    State : Goa
    Postal Code : 403804
    Country : IND

Metadata Contact(s):
1. Name : Mr. Sakthivel Samy V
    Role : PointOfContact
    Phone : +91-832-2525515
    E-Mail : vssamy [ at ] ncpor.res.in
    Organization Name : National Centre for Polar and Ocean Research (NCPOR)
    Address : Headland Sada, Vasco da Gama, Goa 403804
    City : Vasco-da-Gama
    State : Goa
    Postal Code : 403804
    Country : IND

Extent:
Start Date : 2004-01-01
End Date   : 2005-12-31