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Measurements of the UV radiation (Blue, Violet, UVA and UVB) falling on sea ice in McMurdo Sound, quantification of sea ice algae and the effect of snow thickness on the transmissivity of sea ice to UV radiation
Entry ID: K041_1995_1996_NZ_1


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Summary
Abstract: The relative amounts of visible, near and far UV radiation (Blue, Violet, UVA and UVB) falling onto sea ice in McMurdo Sound was measured at a site well cantered in the ice, i.e. not at the ice edge. Two instruments were used to measure the UV levels. One is a three channel motor, which measures the total downward radiation in the Blue, Violet and Ultraviolet regions. A shade can be used to separate the direct sun radiation from the background sky radiation and a filter provides a separation of the UV channel into UVA and UVB radiation. The second instrument consists of a monochromator attached to a small telescope and measures the spectral distribution of radiation from a 5 degree region of the sky. The incident light is separated into polarisation components and the instrument thus also measures the polarisation of the skylight. The weather during the recording period was overcast with snow and blizzards but the monitors were run throughout this period and accumulated data on UVA, UVB and UV radiation levels under overcast conditions. The amount of algae growing in the area around the ice was simultaneously quantified. A two wavelength detector measured the amount of light at different locations on a circle of about 1m radius. The detectors were sensitive to red and green wavelengths. Algae absorb radiation strongly in the green, so the relative intensity in these two bands should indicate the amount of algae present. The effect of various thicknesses of snowfall on the UV transmission through to the sea ice algae below the ice was measured using samples cut from snow drifts.
Geographic Coverage
 N: -77.6833 S: -77.6833  E: 166.3833  W: 166.3833

Temporal Coverage
Start Date: 1995-11-01
Stop Date: 1995-11-13


Location Keywords
CONTINENT > ANTARCTICA
CONTINENT > ANTARCTICA > MCMURDO SOUND
CONTINENT > ANTARCTICA > TENT ISLAND
GEOGRAPHIC REGION > POLAR


Science Keywords
ATMOSPHERE >ATMOSPHERIC RADIATION >TRANSMITTANCE    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >ULTRAVIOLET RADIATION    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Platform
GROUND STATIONS    [Information]


Instrument
MONOCHROMATORS    [Information]


Data Set Progress
COMPLETE


Data Center
Antarctica New Zealand, New Zealand Antarctic Institute, New Zealand    [Information]
Data Center URL: http://www.antarcticanz.govt.nz/

Data Center Personnel
Name: SHULAMIT GORDON
Phone: +64 3 358 0200
Fax: +64 3 358 0211
Email: s.gordon at antarcticanz.govt.nz
Contact Address:
Antarctica New Zealand
Private Bag 4745
City: Christchurch
Country: New Zealand


Personnel
DAVID BEAGLEHOLE
Role: INVESTIGATOR
Phone: +64 4 473 7749
Fax: +64 4 473 2686
Email: david.beaglehole at beaglehole.com
Contact Address:
Beaglehole Instruments Ltd
32 Salamanca Road
Kelburn
City: Wellington
Postal Code: 6012
Country: New Zealand


CEISHA POIROT
Role: DIF AUTHOR
Phone: +64 3 358 0200
Fax: +64 3 358 0211
Email: c.poirot at antarcticanz.govt.nz
Contact Address:
Antarctica New Zealand
Private Bag 4745
City: Christchurch
Country: New Zealand


SHULAMIT GORDON
Role: DIF AUTHOR
Phone: +64 3 358 0200
Fax: +64 3 358 0211
Email: s.gordon at antarcticanz.govt.nz
Contact Address:
Antarctica New Zealand
Private Bag 4745
City: Christchurch
Country: New Zealand


Publications/References
Beaglehole, D. Ramanathan, B. Rumberg, J. 1998 The UV and IR transmittance of Antarctic snow. Journal of geophysical research 103(8): 8849-8857

Creation and Review Dates
DIF Creation Date: 2009-05-21
Last DIF Revision Date: 2009-06-06


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