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  • 1. Lindfors, Anders
    et al.
    Tanskanen, Aapo
    Arola, Antti
    van der A, Ronald
    Bais, Alkiviadis
    Feister, Uwe
    Janouch, Michal
    Josefsson, Weine
    SMHI, Core Services.
    Koskela, Tapani
    Lakkala, Kaisa
    den Outer, Peter N.
    Smedley, Andrew R. D.
    Slaper, Harry
    Webb, Ann R.
    The PROMOTE UV Record: Toward a Global Satellite-Based Climatology of Surface Ultraviolet Irradiance2009In: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, ISSN 1939-1404, E-ISSN 2151-1535, Vol. 2, no 3, p. 207-212Article in journal (Refereed)
    Abstract [en]

    This paper describes the PROMOTE UV Record, which aims to provide a global long-term record of the surface UV radiation. The algorithm developed takes as input cloud information from the International Satellite Cloud Climatology Project (ISCCP) and a recently developed multisensor assimilated record of the total ozone column. Aerosols and surface albedo are based on climatologies. Here, first validation results of the PROMOTE UV Record are presented through comparison against ground-based measurements of daily erythemal UV doses at eight European stations. The validation shows that the method is working reasonably, although there is a clear tendency toward overestimation. Typically, the median bias as compared to measurements is 3%-10% and 56%-68% of the daily doses are within +/- 20% from the ground-based reference. The prototype version of the PROMOTE UV Record included in this paper covers the period from July 2002 to June 2005. The time series will later be extended to start in 1983.

  • 2. Petkov, Boyan H.
    et al.
    Vitale, Vito
    Tomasi, Claudio
    Siani, Anna Maria
    Seckmeyer, Gunther
    Webb, Ann R.
    Smedley, Andrew R. D.
    Casale, Giuseppe Rocco
    Werner, Rolf
    Lanconelli, Christian
    Mazzola, Mauro
    Lupi, Angelo
    Busetto, Maurizio
    Diemoz, Henri
    Goutail, Florence
    Koehler, Ulf
    Mendeva, Bogdana D.
    Josefsson, Weine
    SMHI, Core Services.
    Moore, David
    Lopez Bartolome, Maria
    Moreta Gonzalez, Juan Ramon
    Misaga, Oliver
    Dahlback, Arne
    Toth, Zoltan
    Varghese, Saji
    De Backer, Hugo
    Stuebi, Rene
    Vanicek, Karel
    Response of the ozone column over Europe to the 2011 Arctic ozone depletion event according to ground-based observations and assessment of the consequent variations in surface UV irradiance2014In: Atmospheric Environment, ISSN 1352-2310, E-ISSN 1873-2844, Vol. 85, p. 169-178Article in journal (Refereed)
    Abstract [en]

    The strong ozone depletion event that occurred in Arctic during spring 2011 was found to cause appreciable reduction in the ozone column (OC) in Europe, even at lower latitudes. The features of this episode have been analysed using the data recorded at 34 ground-based stations located in the European area and compared with the similar events in 2000 and 2005. The results provided evidence that OC as far south as 40 degrees N latitude was considerably influenced by the Arctic ozone loss in spring 2011. The reduction of OC at the northernmost sites was about 40% with respect to the mean value calculated over the previous six-year period, while a similar decrease at the southern extreme ranged between 15 and 18%, and were delayed by nearly two weeks compared to the Arctic region. The ozone distributions reconstructed for the West Europe sector show that the decline of OC lasted from late March to late April 2011. The echo of the Arctic ozone depletion on mid-latitude UV irradiance has been analysed trough model computations that show an increase of the midday erythemal dose by 3-4 SED (1 SED = 100 J m(-2)) that was slightly higher than at polar regions. On the other hand it was assessed that the biosystems in the northernmost regions were a subject of about 4 times higher UV stress than those at mid-latitudes. Despite indications of an OC recovery, the event examined here shows that the issue of ozone depletion episodes cannot be belittled. (C) 2013 Elsevier Ltd. All rights reserved.

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