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The results of two methods retrieving actinic flux and ozone photolysis frequencies (JO 1 D), from measure- ments of irradiance with a Brewer MKIII spectroradiome- ter are investigated in this paper. The first method uses ac- tinic flux retrieved from irradiance measurements by the use of known formulas while the second is an empirical method converting irradiance to JO 1 D through polynomials extracted from a study of synchronous actinic flux and irradiance mea- surements. When examining the actinic fluxes derived from the first method to those measured by an actinic flux spec- trometer data agree within ±10% for solar zenith angles lower than 75 for the UV-B and the UV-A wavelength band. Also, the actinic to global irradiance ratio derived, deviates within ±6% for solar zenith angles lower than 70 compared with cloudless sky calculations of the TUV model. For both cases the deviations are in the order of the magnitude of the measurement or model uncertainties. Values of JO 1 D calcu- lated by the second method show a mean ratio of 0.99±0.10 (1 ) and 0.98±0.06 for all data and for cloudless skies re- spectively when compared with values of JO 1 D derived by a Bentham actinic flux spectroradiometer. Finally, the agree- ment of the two methods is within ±5% comparing two years' data of JO 1 D retrieved from irradiance measurements at Thessaloniki, Greece. The use of such methods on exten- sive data sets of global irradiance can provide JO 1 D values with acceptable uncertainty, a parameter of particular impor- tance for chemical process studies.

atmospheric chemistry and physics

Actinic flux and O&amp;lt;sup&amp;gt;1&amp;lt;/sup&amp;gt;D photolysis frequencies retrieved from spectral measurements of irradiance at Thessaloniki, Greece