Aerosol characteristics and aerosol radiative forcing over Maitri, Antarctica
During the 20th Indian Antarctic expedition conducted in January-February 2001, a detailed study on the aerosol spectral optical depth, mass concentration and size-distribution along with columnar ozone and watervapour concentrations was made from the Indian station, Maitri (70.77° S, 11.73° E). A l...
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ftindianacasci:oai:repository.ias.ac.in:13416 2023-05-15T13:46:24+02:00 Aerosol characteristics and aerosol radiative forcing over Maitri, Antarctica Gadhavi, H. Jayaraman, A. 2004-01-25 application/pdf http://repository.ias.ac.in/13416/ http://repository.ias.ac.in/13416/1/327.pdf http://www.ias.ac.in/currsci/jan252004/296.pdf unknown Current Science Association http://repository.ias.ac.in/13416/1/327.pdf Gadhavi, H. Jayaraman, A. (2004) Aerosol characteristics and aerosol radiative forcing over Maitri, Antarctica Current Science, 86 (2). pp. 296-304. ISSN 0011-3891 Article PeerReviewed 2004 ftindianacasci 2013-01-20T10:02:18Z During the 20th Indian Antarctic expedition conducted in January-February 2001, a detailed study on the aerosol spectral optical depth, mass concentration and size-distribution along with columnar ozone and watervapour concentrations was made from the Indian station, Maitri (70.77° S, 11.73° E). A low aerosol optical depth of about 0.03 at 400 nm wavelength and a dry aerosol mass concentration of about 7 µg/m 3 for the PM 10 particles are found for this anthropogenically least-affected continent on the earth. The aerosol sizedistribution reveals that about 63% of the total aerosol mass comes from particles of size greater than 1 µm, which are of mainly natural origin. Average columnar ozone and total precipitable water-vapour content during the observation period were found to be 271.6 DU and 0.147 cm respectively, and the observed day-to-day variations are explained using air back-trajectory analysis. Estimation of aerosol radiative forcing over Maitri reveals a positive forcing of 0.95 W/m 2 at the top of the atmosphere and -0.83 W/m 2 at the surface. Using model calculations, it is shown that these forcing values can have large annual variation both in magnitude and sign due to variation in the sun-earth geometry, typical of a polar region, even if we assume a constant aerosol amount throughout the year. Article in Journal/Newspaper Antarc* Antarctic Antarctica Indian Academy of Sciences: Publication of Fellows Antarctic Indian Maitri ENVELOPE(11.733,11.733,-70.764,-70.764) |
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Indian Academy of Sciences: Publication of Fellows |
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ftindianacasci |
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description |
During the 20th Indian Antarctic expedition conducted in January-February 2001, a detailed study on the aerosol spectral optical depth, mass concentration and size-distribution along with columnar ozone and watervapour concentrations was made from the Indian station, Maitri (70.77° S, 11.73° E). A low aerosol optical depth of about 0.03 at 400 nm wavelength and a dry aerosol mass concentration of about 7 µg/m 3 for the PM 10 particles are found for this anthropogenically least-affected continent on the earth. The aerosol sizedistribution reveals that about 63% of the total aerosol mass comes from particles of size greater than 1 µm, which are of mainly natural origin. Average columnar ozone and total precipitable water-vapour content during the observation period were found to be 271.6 DU and 0.147 cm respectively, and the observed day-to-day variations are explained using air back-trajectory analysis. Estimation of aerosol radiative forcing over Maitri reveals a positive forcing of 0.95 W/m 2 at the top of the atmosphere and -0.83 W/m 2 at the surface. Using model calculations, it is shown that these forcing values can have large annual variation both in magnitude and sign due to variation in the sun-earth geometry, typical of a polar region, even if we assume a constant aerosol amount throughout the year. |
format |
Article in Journal/Newspaper |
author |
Gadhavi, H. Jayaraman, A. |
spellingShingle |
Gadhavi, H. Jayaraman, A. Aerosol characteristics and aerosol radiative forcing over Maitri, Antarctica |
author_facet |
Gadhavi, H. Jayaraman, A. |
author_sort |
Gadhavi, H. |
title |
Aerosol characteristics and aerosol radiative forcing over Maitri, Antarctica |
title_short |
Aerosol characteristics and aerosol radiative forcing over Maitri, Antarctica |
title_full |
Aerosol characteristics and aerosol radiative forcing over Maitri, Antarctica |
title_fullStr |
Aerosol characteristics and aerosol radiative forcing over Maitri, Antarctica |
title_full_unstemmed |
Aerosol characteristics and aerosol radiative forcing over Maitri, Antarctica |
title_sort |
aerosol characteristics and aerosol radiative forcing over maitri, antarctica |
publisher |
Current Science Association |
publishDate |
2004 |
url |
http://repository.ias.ac.in/13416/ http://repository.ias.ac.in/13416/1/327.pdf http://www.ias.ac.in/currsci/jan252004/296.pdf |
long_lat |
ENVELOPE(11.733,11.733,-70.764,-70.764) |
geographic |
Antarctic Indian Maitri |
geographic_facet |
Antarctic Indian Maitri |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
http://repository.ias.ac.in/13416/1/327.pdf Gadhavi, H. Jayaraman, A. (2004) Aerosol characteristics and aerosol radiative forcing over Maitri, Antarctica Current Science, 86 (2). pp. 296-304. ISSN 0011-3891 |
_version_ |
1766241838651408384 |