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Temporal instability of temperature singularities in a long-term series at Prague-Klementinum

机译:布拉格-克莱门蒂努姆一个长期序​​列中的温度奇异点的时间不稳定性

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摘要

The recent study of meteorological singularities in the Czech Republic-Reznickova ct al. (Theor Appl Climatol 88:179-192,2007)-is supplemented with respect to findings concerning temporal stability of air temperature singularities. A long-term daily series at Prague-Klementinum is examined over 1881-2000, adopting the same statistical background for the detection of singularities. A procedure that reduces the dependence of results on the choice of a reference period is proposed. It is shown that nearly all temperature singularities found over the period since 1961 and/or the whole period of 1881-2000 are temporally unstable, and a lot of them should be treated as statistical properties of particular data samples (time periods) reflecting sampling variability rather than stable and recurrent anomalies related to distinct circulation patterns. The most important singularities are identified, occurring on 4 days in year only (around St. Medard's Day, 8 June), and they are linked to intraseasonal variations in the occurrence of circulation patterns conducive to warm and cold temperature anomalies. A sharp increase (decrease) in the frequency of north (south) circulation types after 8 June leads to the most robust irregularity in the mean annual cycle of temperature.
机译:捷克共和国-Reznickova等人最近对气象奇点的研究。 (Theor Appl Climatol 88:179-192,2007)-关于与空气温度奇异点的时间稳定性有关的发现被补充。在1881年至2000年期间,我们对布拉格-金文泰努姆(Kragueinum)的一个长期日序列进行了研究,采用相同的统计背景来检测奇点。提出了一种减少结果对参考周期选择的依赖性的程序。结果表明,自1961年以来和/或1881-2000年整个时期内发现的几乎所有温度奇异点在时间上都是不稳定的,因此应将它们中的许多作为特定数据样本(时间段)的统计特性来对待,以反映样本的可变性而不是与明显的循环模式有关的稳定且反复出现的异常。确定了最重要的奇异点,仅在一年中的4天(大约在6月8日圣梅达德节)发生,它们与季节内的环流变化有关,从而导致了冷热温度异常。 6月8日之后,北(南)环流类型的频率急剧增加(减少)会导致平均年均温度周期中最明显的不规则性。

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  • 来源
    《Theoretical and applied climatology》 |2009年第4期|235-243|共9页
  • 作者

    Michaela Radova; Jan Kysely;

  • 作者单位

    Department of Meteorology and Environment Protection,Faculty of Mathematics and Physics, Charles University,V Holesovickach 2,180 00 Prague 8, Czech Republic;

    Institute of Atmospheric Physics AS CR,Bocni II 1401,141 31 Prague, Czech Republic;

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