Amplitude and frequency of temperature extremes over the North Atlantic region

Details Amplitude and frequency of temperature extremes over the North Atlantic region Amplitude and frequency of temperature extremes over the North Atlantic region

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3310801n&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 10, CiteID L10801

Mathematics

Probability

13

Mathematical Geophysics: Stochastic Processes (3235, 4468, 4475, 7857), Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Nonlinear Geophysics: Probability Distributions, Heavy And Fat-Tailed (3265)

Scientific paper

Recent studies on extreme events have focused on the potential change of their intensity during the 20th century, but their frequency evolution has often been overlooked although its socio-economic impact is equally important. This paper focuses on extreme events of high and low temperatures and their amplitude and frequency changes over the last 60 years in the North Atlantic (NA) region. We analyze the temporal evolution of the amplitude and frequency of extreme events through the parameters of an extreme value distribution applied to NCEP reanalysis for the winter and summer seasons. We examine the relation of the statistics of extremes with greenhouse gas forcing and an atmospheric circulation index and obtain a spatial distribution of the trends of those extreme parameters. We find that the frequency of warm extremes increases over most of the NA while their magnitude does not vary as systematically. Apart from the Labrador Sea and parts of Scandinavia, the features of winter cold extremes exhibit decreasing or no trends.

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