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Observations and model calculations of direct solar UV irradiances in the Schirmacher region of east Antarctica

Ghude, SD and Singh, S and Kulkarni, PS and Kumar, A and Jain, SL and Singh, R and Arya, BC (2008) Observations and model calculations of direct solar UV irradiances in the Schirmacher region of east Antarctica. International Journal of Remote Sensing, 29 (20). pp. 5907-5921.

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Abstract

Measurements of direct UV irradiances (using a MICROTOPS II Sunphotometer) carried out from a high-latitude site, Antarctica are presented. The instantaneous irradiances at 305 ± 0.9, 312 ± 0.9 and 320 ± 1.0 nm during a no-ozone-hole (13 December 2004) and an ozone-hole (4 October 2004) period have been observed to be about 0.031, 0.150 and 0.299 W m-2 and 0.010, 0.049 and 0.102 W m-2, respectively at local noontime. The observations of the direct UV irradiances at 305 ± 0.9, 312 ± 0.9 and 320 ± 1.0 nm are compared with tropospheric ultraviolet visible (TUV) radiation transfer model calculations. The model estimate shows that, during the ozone-hole period, a loss of ozone of the order of 44 leads to an increase in irradiance of the order of 410, 90 and 25 at 305 ± 0.9, 312 ± 0.9 and 320 ± 1.0 nm, respectively. The relationship between change in UV irradiance due to a change in column ozone is obtained using a TUV model and irradiances thus estimated from this relationship are found to compare well with the observed irradiances.

Item Type: Article
Additional Information: Copyright of this article belongs to Taylor & Francis
Uncontrolled Keywords: Air pollution, Antarctica; Model calculations; Sun photometers; UV irradiances, Ozone, estimation method; irradiance; modeling; ozone; photometer; radiative transfer; remote sensing; solar radiation; ultraviolet radiation, Antarctica; East Antarctica; Schirmacher Oasis
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 13 Feb 2015 10:32
Last Modified: 13 Feb 2015 10:32
URI: http://moeseprints.incois.gov.in/id/eprint/1828

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