Variations of erythemal ultraviolet irradiance and dose at Tartu/Tõravere, Estonia
نویسندگان
چکیده
منابع مشابه
Contribution of Ultraviolet Irradiance Variations to Changes in the Sun's Total Irradiance.
The sun's total irradiance decreased from 1980 to mid-1985, remained approximately constant until mid-1987, and has recently begun to increase. This time interval covered the decrease in solar activity from the maximum of solar cycle 21 to solar minimum and the onset of cycle 22. The sun's ultraviolet irradiance also decreased during the descending phase of cycle 21 and, like the total irradian...
متن کاملA new method for measurement of erythemal irradiance.
A composite system of four dosimeter materials, nalidixic acid (NDA), polysulphone, 8-methoxypsoralen (8-MOP) and phenothiazine, is presented for the passive measurement of the UV spectrum. The properties of the materials were investigated and found to be suitable to allow the materials to be applied in a system to evaluate the UV spectrum. The evaluation of the spectrum reduces by 70% the erro...
متن کاملErythemal irradiances of filtered ultraviolet radiation.
A spectrum evaluator (3 cm x 3 cm) employing four passive dosimeters has been used to evaluate the time averaged spectrum to allow calculation of the erythemal exposures resulting from the predominantly UVA component of filtered solar ultraviolet radiation. An exposure interval of approximately 20 min to autumn and spring sunshine was required for the spectrum evaluator to allow evaluation of t...
متن کاملSpatiotemporal exposure modeling of ambient erythemal ultraviolet radiation
BACKGROUND Ultraviolet B (UV-B) radiation plays a multifaceted role in human health, inducing DNA damage and representing the primary source of vitamin D for most humans; however, current U.S. UV exposure models are limited in spatial, temporal, and/or spectral resolution. Area-to-point (ATP) residual kriging is a geostatistical method that can be used to create a spatiotemporal exposure model ...
متن کاملExperimental and modeled UV erythemal irradiance under overcast conditions: the role of cloud optical depth
This paper evaluates the relationship between the cloud modification factor (CMF) in the ultraviolet erythemal range and the cloud optical depth (COD) retrieved from the Aerosol Robotic Network (AERONET) “cloud mode” algorithm under overcast cloudy conditions (confirmed with sky images) at Granada, Spain, mainly for non-precipitating, overcast and relatively homogenous water clouds. Empirical C...
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ژورنال
عنوان ژورنال: Climate Research
سال: 2002
ISSN: 0936-577X,1616-1572
DOI: 10.3354/cr022245