The sub-micron aerosol size-distribution measurements during the XVI Indian Antarctica Expedition

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Brief Description (Abstract):

Measurements of the size distribution of sub-micron aerosol particles in the range of 0.003 to 1/?m have been made with an Electrical Aerosol Analyzer over the Indian ocean and at Maitri during the sixteenth Indian expedition to Antarctica. Observations show that the high concentrations of aerosol particles observed over the Indian ocean in the northern hemisphere extend upto the southern limit of Inter Tropcial Convergence zone. Our measurements indicate the accmulation of aerosol particles in ITCZ. Beyond ITCZ in the southen hemisphere, typical low aerosol concentration of pristine air are observed. Over open ocean, the sizedistribution of particles is observed to be bimodal with a maximum at 0.133?m and two minima at 0.075 and 0.42?m and aerosol concentrations are open ended at both ends. Observations also indicate production of 'large' particles in roaring forties and enhancement of aerosol concentrations associated with the low pressure systems circulating around the Antarctica.

Status: Completed

Purpose: At Maitri, the aerosol concentrations in the observed size range are of the order of 102 - 103 cm-3 during this season. Some peaks, possibly associated with low pressure systems circulating around the continent of Antarctica, reaching up to 104 particles cm-3 are observed. In general, aerosol concentrations remain quite constant for several hours and have bimodal size distributions not much different in shape from those observed over open ocean. The results indicate that the particles in nucleation mode generated by the gas-to-particle conversion process are transported close to the ground under subsidence of the mid tropospheric air.

Presentation Format: Documentdigital

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Supplemental Information:

TableDigital

Keyword(s): Earth Science-Atmosphere,

Place/Location(s): Maitri, Antarctic,

Project: The sub-micron aerosol size-distribution measurements during the XVI Indian Antarctica Expedition,

Topic Category(s): ClimatologyMeteorologyAtmosphere,

Date(s): 2020-09-18 (Creation),

Resource Contact(s):
1. Name : Dr. C C Deshpande
    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 : 1996-01-01
End Date   : 1997-12-31