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Recent change - atmosphere
Stendel, M.; van den Besselaer, E.; Hannachi, A.; Kent, E.C.; Lefebvre, C.; Schenk, F.; van der Schrier, G.; Woollings, T. (2016). Recent change - atmosphere, in: Quante, M. et al. North Sea region climate change assessment. Regional Climate Studies, : pp. 55-84. http://dx.doi.org/10.1007/978-3-319-39745-0_2
In: Quante, M.; Colijn, F. (Ed.) (2016). North Sea region climate change assessment. Regional Climate Studies. Springer: Switzerland. ISBN 978-3-319-39743-6. xlv, 528 pp.
In: Regional Climate Studies. Springer: Berlin. ISSN 1862-0248; e-ISSN 1865-505X
Peer reviewed article  
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  • Stendel, M.
  • van den Besselaer, E.
  • Hannachi, A.
  • Kent, E.C.
  • Lefebvre, C.
  • Schenk, F.
  • van der Schrier, G.
  • Woollings, T.
Abstract
    This chapter examines past and present studies of variability and changes in atmospheric variables within the North Sea region over the instrumental period; roughly the past 200 years. The variables addressed are large-scale circulation, pressure and wind, surface air temperature, precipitation and radiative properties (clouds, solar radiation, and sunshine duration). Temperature has increased everywhere in the North Sea region, especially in spring and in the north. Precipitation has increased in the north and decreased in the south. There has been a north-eastward shift in storm tracks, which agrees with climate model projections. Due to large internal variability, it is not clear which aspects of the observed changes are due to anthropogenic activities and which are internally forced, and long-term trends are difficult to deduce. The number of deep cyclones seems to have increased (but not the total number of cyclones). The persistence of circulation types seems to have increased over the past century, with ‘more extreme’ extreme events. Changes in extreme weather events, however, are difficult to assess due to changes in instrumentation, station relocations, and problems with digitisation. Without thorough quality control digitised datasets may be useless or even counterproductive. Reanalyses are useful as long as biases introduced by inhomogeneities are properly addressed. It is unclear to what extent circulation over the North Sea region is controlled by distant factors, especially changes in Arctic sea ice.
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