UV and total ozone climatology at the South Pole based on Version 2 NSF network data

摘要

Spectral ultraviolet (UV) and visible irradiance has been monitored at the South Pole with a SUV-100 spectro-radiometer since 1991. A new data version labeled "Version 2" has recently been produced, which has a higher accuracy than the original released "Version 0". We have established a UV climatology for the South Pole based on the new data set, focusing on the effects of cloudiness, total column ozone, and volcanic aerosols. In addition, total column ozone was calculated from the spectral UV measurements for solar zenith angles (SZA) up to 87° using a recently developed algorithm. This new total ozone data set can complement Dobson ozone observations to validate satellite total ozone data. At the South Pole, NASA/TOMS Version 7 overpass data exceed SUV-100 total ozone measurements by 5-8%. In contrast, TOMS Version 8 data agree on average to within 2% with SUV-100 measurements, and the ratio of the two data sets shows virtually no dependence on SZA and the ozone amount. The good agreement confirms that the well-documented bias of TOMS Version 7 data at high austral latitudes was successfully reduced with the release of Version 8. A similar comparison between SUV-100, Dobson, and TOMS ozone measurements was performed for the NSF/OPP network site at Arrival Heights (78°S), and results are discussed.