Atmospheric Chemistry and Physics Discussions
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2008
10.5194/acpd-8-1089-2008
http://www.atmos-chem-phys-discuss.net/8/1089/2008/
http://www.atmos-chem-phys-discuss.net/8/1089/2008/acpd-8-1089-2008.html
http://www.atmos-chem-phys-discuss.net/8/1089/2008/acpd-8-1089-2008.pdf
1089
1111
2008-01-23
Proposal of a new erythemal UV radiation amplification factor
A. Serrano
asp@unex.es
M. Antón
M. L. Cancillo
J. A. García
Departamento de Física, Universidad de Extremadura, Badajoz, Spain
This work is aimed to propose a natural expansion of radiation amplification
factor (RAF) for erythemal irradiance to consider all solar zenith angles
cases together. In this direction, the article analyzes the relationship
between measurements of UV erythemal radiation (UVER) recorded at Badajoz
(Spain) and the total ozone column estimated by the instrument TOMS/NASA for
that location during the period February 2001–December 2005. The new RAF
parameter is formulated by power equation using slant ozone and UVER
atmospheric transmissivity values. Thus, reliable values of this parameter
have been reported. These values could serve as a new relevant index for
comparison with other studies and model's result.
<br><br>
The new RAF is calculated with measurements recorded during completely clear
cases using clearness index values higher than 0.75. The RAF value was
1.35±0.01, it is to say, when the slant ozone amount decreases 1% at
Badajoz, UVER atmospheric transmissivity values and, therefore, UVER surface
values approximately increase 1.35%. This result emphasizes the interest
of measuring and monitoring simultaneous measurements of UV radiation and
stratospheric ozone even for mid-latitudes. The influence of total ozone
amount and cloudiness changes on new RAF values is analyzed. Cloud-free
conditions allow to study the ozone influences while cloud effects are
analyzed with all data by means of monthly average of slant ozone and UVER
atmospheric transmissivities values.
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