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Proceedings Paper

Shipborne measurements of UV irradiance on a north-south Atlantic transect
Author(s): Sigrid Wuttke; Saad El Dine El Naggar; Thaddäus Bluszcz; Otto Schrems
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Paper Abstract

Ship-borne measurements of spectral as well as biologically effective UV irradiance have been performed on the German research vessel Polarstern during the Atlantic transect from Bremerhaven, Germany, to Cape Town, south Africa, from 13 October to 17 November 2005. Such measurements are required to study UV effects on marine organisms. They are also necessary to validate satellite-derived surface UV irradiance. Cloud free radiative transfer calculations support the investigation of this latitudinal dependence. Input parameters, such as total ozone column and aerosol optical depth have been measured on board as well. The maximum daily dose of erythemal irradiance with 5420 J/m2 was observed on 14 November 2005, when the ship was in the tropical Atlantic south of the equator. The expected UV maximum should have been observed with the Sun in the zenith during local noon (11 November). Stratiform clouds reduced the dose to 3835 J/m2. In comparison, the daily erythemal doses in the mid-latitudinal Bay of Biscay only reached values between 410 and 980 J/m2 depending on cloud conditions. The deviation in daily erythemal dose derived from different instruments is around 5%. The feasibility to perform ship-borne measurements of spectral UV irradiance is demonstrated.

Paper Details

Date Published: 11 October 2006
PDF: 11 pages
Proc. SPIE 6362, Remote Sensing of Clouds and the Atmosphere XI, 636210 (11 October 2006); doi: 10.1117/12.689695
Show Author Affiliations
Sigrid Wuttke, Alfred Wegener Institute for Polar and Marine Research (Germany)
Saad El Dine El Naggar, Alfred Wegener Institute for Polar and Marine Research (Germany)
Thaddäus Bluszcz, Alfred Wegener Institute for Polar and Marine Research (Germany)
Otto Schrems, Alfred Wegener Institute for Polar and Marine Research (Germany)


Published in SPIE Proceedings Vol. 6362:
Remote Sensing of Clouds and the Atmosphere XI
James R. Slusser; Klaus Schäfer; Adolfo Comerón, Editor(s)

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