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Spatial changes in two major modes of atmospheric circulation variability during the 20th century
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SYSNO ASEP 0580719 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Spatial changes in two major modes of atmospheric circulation variability during the 20th century Author(s) Piskala, V. (CZ)
Huth, Radan (UFA-U) RID, ORCIDNumber of authors 2 Source Title Geografie. - : Česká geografická společnost - ISSN 1212-0014
Roč. 128, č. 4 (2023), s. 379-396Number of pages 18 s. Language eng - English Country CZ - Czech Republic Keywords teleconnections ; North Atlantic Oscillation ; Pacific/North American Pattern ; atmospheric circulation ; modes of variability Subject RIV DG - Athmosphere Sciences, Meteorology OECD category Meteorology and atmospheric sciences R&D Projects GA17-07043S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UFA-U - RVO:68378289 UT WOS 001125204300004 EID SCOPUS 85179329748 DOI 10.37040/geografie.2023.017 Annotation This study presents the time development of two major modes of atmospheric circulation variability in the Northern Hemisphere, the North Atlantic Oscillation (NAO) and the Pacific/North American Pattern (PNA), during the 20th century. We employ 500 hPa winter monthly means of the long-term reanalysis 20CR, which cover the 1871-2011 period. We use a moving Principal Component Analysis calculated for 40-year periods with a one-year step. The spatial structure of NAO is well developed and stable during the whole 20th century using the ensemble mean. However, substantial changes in PNA pattern occur during the late 19th century. Its centres are weaker and smaller, except the centre over the northern Pacific Ocean, which is stronger and larger in the early period. However, these changes are not visible when using ensemble members. Therefore, we suggest that these shifts do not reflect real changes in the atmosphere but are produced by the reanalysis and statistical method itself. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2024 Electronic address https://geografie.cz/media/pdf/geografie.2023.017.pdf
Number of the records: 1