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Long-term variability of drought indices in the Czech Lands and effects of external forcings and large-scale climate variability modes
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SYSNO ASEP 0504704 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Long-term variability of drought indices in the Czech Lands and effects of external forcings and large-scale climate variability modes Author(s) Mikšovský, Jiří (UEK-B) RID
Brázdil, Rudolf (UEK-B) RID, SAI, ORCID
Trnka, Miroslav (UEK-B) RID, ORCID, SAI
Pisoft, P. (CZ)Number of authors 4 Source Title Climate of the Past - ISSN 1814-9324
Roč. 15, č. 2 (2019), s. 827-847Number of pages 21 s. Language eng - English Country DE - Germany Keywords atlantic multidecadal oscillation ; moisture variability ; volcanic-eruptions ; european drought ; north-american ; reconstruction ; solar ; precipitation ; documentary ; temperature Subject RIV DG - Athmosphere Sciences, Meteorology OECD category Meteorology and atmospheric sciences R&D Projects GA17-10026S GA ČR - Czech Science Foundation (CSF) Research Infrastructure CzeCOS II - 90061 - Ústav výzkumu globální změny AV ČR, v. v. i. Method of publishing Open access Institutional support UEK-B - RVO:86652079 UT WOS 000466420100001 EID SCOPUS 85065302417 DOI 10.5194/cp-15-827-2019 Annotation While a considerable number of records document the temporal variability of droughts for central Europe, the understanding of its underlying causes remains limited. In this contribution, time series of three drought indices (Standardized Precipitation Index SPI, Standardized Precipitation Evapotranspiration Index SPEI, Palmer Drought Severity Index PDSI) are analyzed with regard to mid-to long-term drought variability in the Czech Lands and its potential links to external forcings and internal climate variability modes over the 1501-2006 period. Employing instrumental and proxy-based data characterizing the external climate forcings (solar and volcanic activity, greenhouse gases) in parallel with series representing the activity of selected climate variability modes (El Nino-Southern Oscillation ENSO, Atlantic Multidecadal Oscillation AMO, Pacific Decadal Oscillation PDO, North Atlantic Oscillation NAO), regression and wavelet analyses were deployed to identify and quantify the temporal variability patterns of drought indices and similarity between individual signals. Aside from a strong connection to the NAO, temperatures in the AMO and (particularly) PDO regions were disclosed as one of the possible drivers of inter-decadal variability in the Czech drought regime. Colder and wetter episodes were found to coincide with increased volcanic activity, especially in summer, while no clear signature of solar activity was found. In addition to identification of the links themselves, their temporal stability and structure of their shared periodicities were investigated. The oscillations at periods of approximately 60-100 years were found to be potentially relevant in establishing the teleconnections affecting the long-term variability of central European droughts. Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2020 Electronic address https://www.clim-past.net/15/827/2019/cp-15-827-2019.pdf
Number of the records: 1