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Impact of non-Gaussian statistics of atmospheric variables on extreme intramonth anomalies

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dc.contributor.author Loginov S.
dc.contributor.author Eliseev A.
dc.contributor.author Mokhov I.
dc.date.accessioned 2018-04-05T07:08:49Z
dc.date.available 2018-04-05T07:08:49Z
dc.date.issued 2017
dc.identifier.issn 0001-4338
dc.identifier.uri http://dspace.kpfu.ru/xmlui/handle/net/129351
dc.description.abstract © 2017, Pleiades Publishing, Ltd. The analysis of asymmetry of probability distribution functions (PDF) is carried out for key atmospheric variables using the JRA-55 reanalysis data in the troposphere of the Northern Hemisphere for 1976–2014. The nonzero asymmetry of the PDF indicates the deviation of the PDF from the normal distribution. The analysis was carried out for two time-scale intervals: synoptic variability (SV) of 2–7 days and low-frequency variability (LV) of 9–30 days. Statistically significant deviations from the normal probability distribution occur in the regions of the most frequent formation of atmospheric baroclinic perturbations, i.e., over the western parts of the oceans in midlatitudes and downstream in the atmosphere. In the SV time-scale interval, a negative asymmetry of the vertical velocity is revealed in isobaric coordinates for the entire thickness of the free troposphere, which agrees with the overall dominance of cyclonic anomalies in this interval of time scales. In the LV interval, the asymmetry of this variable in the entire free troposphere is positive, which indicates the dominance of anticyclonic anomalies at these time scales. For the zonal velocity, temperature, and geopotential, the asymmetry sign of the PDF for variability with time scales of 2–7 days is different for the upper and lower free troposphere. The asymmetry of the PDF for atmospheric variables indicates the important role of the intermode interaction in the formation of baroclinic perturbations. The corresponding deviations of synoptic variability from the normal distribution, which is found in the upper troposphere of the subpolar and polar latitudes, can be related to the interaction of these perturbations with the winter polar vortex. These deviations of PDF from the normal distribution substantially increase the probability of the appearance of large (in absolute value) anomalies as compared to the case of the Gaussian PDF.
dc.relation.ispartofseries Izvestiya - Atmospheric and Ocean Physics
dc.subject atmospheric variations
dc.subject atmospheric vortices
dc.subject probability distribution function
dc.title Impact of non-Gaussian statistics of atmospheric variables on extreme intramonth anomalies
dc.type Article
dc.relation.ispartofseries-issue 3
dc.relation.ispartofseries-volume 53
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 269
dc.source.id SCOPUS00014338-2017-53-3-SID85021262558

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  • Публикации сотрудников КФУ Scopus [22633]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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