Three years spectral resolved UV-measurements at Koldewey-Station (1997-1999) (scientific paper)

• Main Authors: Gross,Christian, Tueg,Helmut, Schrems,Otto
• Format: Report
• Language: English
• Published: Alfred Wegener Institute/Alfred Wegener Institute/Alfred Wegener Institute 2001
• Subjects: Ny-Ålesund; Memoirs of National Institute of Polar Research; Ny Ålesund; Polar Research; Spitsbergen
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2366; http://id.nii.ac.jp/1291/00002366/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2366&item_no=1&attribute_id=18&file_no=1

In May 1997 long-term measurements of spectral resolved UV-B irradiation (wavelength range of the instrument 280 to 322nm) at the NDSC-Station in Ny-Ålesund (Spitsbergen) were started using a self-developed very fast multichannel spectroradiometer. In March 1998 a multichannel UV-A spectroradiometer was installed at Ny-Ålesund to supplement the spectral range of the measurements from 318 to 400nm. For the evaluation of the data with regard to changes in total ozone the ratio of the measured irradiation at two wavelengths (300nm/320nm) has been used to minimize the influence of other atmospheric parameters like clouds or aerosols. This ratio, called ozone index, is compared with ozone sonde data as well as daily TOMS data of total ozone. This comparison shows a good anticorrelation between the irradiation at short wavelengths and total ozone. Apart from ozone, influences of clouds and varying ground albedo have been investigated. The evaluation of the UV-B data has been supported by radiative transfer modeling.