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Ozone highs and associated flow features in the first half of the twentieth century in different data sets

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In order to better understand weather extremes, their relation to the large-scale climate variability, and their possible changes over time, observation-based atmospheric data sets are required that reach back in time as far as possible and that provide information on the 3-dimensional structure of the atmosphere. A number of new such data sets have been published in recent years, including historical observations, reanalyses, and reconstructions, some of which reach back into the nineteenth century. However, their usefulness for studying weather extremes remains to be shown. Here we compare some of these historical data sets in the first half of the twentieth century, focusing on one specific type of extreme, namely “ozone highs”. Using historical total ozone observations as a starting point, we assess dynamical links between total ozone, the flow near the tropopause, and tropospheric circulation in the “Twentieth Century Reanalysis” (20CR), historical radiosonde and aircraft observations, and hand drawn historical maps. Selected cases are presented for two regions (Europe and China). Ozone highs over Europe in the 1920s to 1950s were qualitatively well reproduced in 20CR and could mostly be interpreted in the context of cut-off lows. Some of these coincided with a blocking high over the North Atlantic or with vigorous cold-air outbreaks. One of these cases is analysed in more detail. Ozone highs over China in the 1930s may have been related to changes in the jet stream and the subtropical tropopause, but they were not always well reproduced in 20CR. The results demonstrate that, in many of the cases, the available data allow a dynamical interpretation. This confirms the potential of the available data and techniques to extend the length of atmospheric data sets suitable for studying extremes.
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Document Type: Research Article

Publication date: 01 February 2012

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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