Drilling for Polar Continental Ice-cores Between Nunataks Veteheia and Tallaksenvarden in East Antarctica.

Access URI: http://npdc.ncaor.gov.in/npdc/search_mf_data.action?search=freeText&expedition_type=all&parameter=MF627317396&userType=user&freeTextValue=Drilling+for+Polar+Continental+Ice-cores+Between+Nunataks+Veteheia+and+Tallaksenvarden+in+East+Antarctica.

Brief Description (Abstract):

The palaeoclimatic record of past several thousand years is preserved in the Antarctic ice sheet as atmospheric air, gases, pollen, dust, volcanic emissions, pollutants. The 180 content of ice shows a general linear relationship with prevalent surface air temperature, thus it is possible to establish a palaeotemperature vs isotope curve. It is necessary to recover continuous ice cores from deeper levels to unravel this palaeoclimatic information..Ice core drilling was done in the 15th Indian Antarctic Expedition in 1996. The effort was successful in touching the bedrock of the glacier at 76 m depth, drilling through its entire thickness. Brittle core was encountered near the bedrock. In the same polar season, a second borehole was drilled at a higher elevation in the continental interior, which generated continuous ice cores upto a depth of 84 m. Core from both the boreholes has been logged for physical parameters. The average density of the core from the first borehole is 0.89 gm/em3

Status: Completed

Purpose: About 98 of the continent of Antarctica is covered by ice. Within the ice, in the form of air bubbles, inclusions and isotopes is preserved the palaeoclimatic record of past several thousand years as atmospheric air, gases, pollen, dust, volcanic emissions, pollutants etc. The 18 0 content of snow shows a general linear relationship with surface air temperature, making it possible to establish a temperature-isotope equation. Again, since the temperatures in polar regions reflect the pronounced changes in seasonal patterns, it is possible to find out if the snow fell in summer or winter. Thus, by counting the thermal layers, it becomes possible to date the ice from depths. To unravel all this palaeoclimatic information, it is necessary to raise ice core samples from deeper levels of the glaciers or ice sheet. A small capacity, cable suspended, dry-electromechanical, Japanese drilling machine was used during the 15 expedition in 1996. Two boreholes were drilled in polar continental ice.

Presentation Format: Documentdigital

Distribution Format: unknown

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Supplemental Information:

TableDigital

Keyword(s): Earth Science-Paleoclimate,

Place/Location(s): Maitri, Antarctic,

Project: Drilling for Polar Continental Ice-cores Between Nunataks Veteheia and Tallaksenvarden in East Antarctica,

Topic Category(s): ClimatologyMeteorologyAtmosphere,

Date(s): 2020-09-17 (Creation),

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

Extent:
Start Date : 1995-01-01
End Date   : 1996-12-31