Solar erythemal irradiance and ozone profile at Buenos Aires and inside and outside the ozone hole at Marambio Argentine Antarctic Base
Abstract
Solar erythemal irradiance (directly related to the UV index) has been measured in Buenos Aires, Argentina, the largest populated city of the country. Similar data have also been obtained at Marambio Argentine Antarctic Base inside and outside the ozone hole region. In the latter case, the largest UV index during the 1996-1999 period, of value 10.2, is 22% lower than the corresponding one for Buenos Aires. However near its maximum, the integrated daily dose, which is of importance in the evaluation of the accumulated dose along a given period, is rather similar in both places. We thus propose to use also this quantity for solar risk forecast at high latitudes. Ozone profile data for Buenos Aires and Marambio Base are presented, as well as time series of erythemal irradiance and ozone total column. Ozone profiles have been determined using the differential absorption lidar technique (DIAL) in Buenos Aires during periods near maximum and minimum of ozone total column and near the maximum of solar intensity. Model calculations of the erythemal irradiance are done, incorporating these profiles as well as those commonly used in this type of analysis. The influence of different atmospheric parameters as well as of the ground albedo on the erythemal irradiance has been tested.
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