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Evaluation of the homogenization adjustments applied to european temperature records in the global historical climatology network dataset
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SYSNO ASEP 0555991 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Evaluation of the homogenization adjustments applied to european temperature records in the global historical climatology network dataset Author(s) O'Neill, P. (GB)
Connolly, R. (US)
Connolly, M. (US)
Soon, W. (US)
Chimani, B. (AT)
Crok, M. (NL)
de Vos, R. (NL)
Harde, H. (DE)
Kajaba, P. (SK)
Nojarov, P. (BG)
Przybylak, R. (PL)
Rasol, D. (HR)
Skrynyk, O. (ES)
Skrynyk, O. (UA)
Štěpánek, Petr (UEK-B) RID, SAI, ORCID
Wypych, A. (PT)
Zahradníček, Pavel (UEK-B) RID, SAINumber of authors 17 Article number 285 Source Title Atmosphere. - : MDPI
Roč. 13, č. 2 (2022)Number of pages 21 s. Language eng - English Country CH - Switzerland Keywords air-temperature ; time-series ; meteorological observations ; data set ; period ; bias ; discontinuities ; urbanization ; variability ; circulation ; temperature homogenization ; non-climatic biases ; station metadata ; climate change ; European temperature changes Subject RIV DG - Athmosphere Sciences, Meteorology OECD category Climatic research R&D Projects EF16_019/0000797 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UEK-B - RVO:86652079 UT WOS 000763940000001 EID SCOPUS 85124677585 DOI 10.3390/atmos13020285 Annotation The widely used Global Historical Climatology Network (GHCN) monthly temperature dataset is available in two formats-non-homogenized and homogenized. Since 2011, this homogenized dataset has been updated almost daily by applying the ,,Pairwise Homogenization Algorithm,, (PHA) to the non-homogenized datasets. Previous studies found that the PHA can perform well at correcting synthetic time series when certain artificial biases are introduced. However, its performance with real world data has been less well studied. Therefore, the homogenized GHCN datasets (Version 3 and 4) were downloaded almost daily over a 10-year period (2011-2021) yielding 3689 different updates to the datasets. The different breakpoints identified were analyzed for a set of stations from 24 European countries for which station history metadata were available. A remarkable inconsistency in the identified breakpoints (and hence adjustments applied) was revealed. Of the adjustments applied for GHCN Version 4, 64% (61% for Version 3) were identified on less than 25% of runs, while only 16% of the adjustments (21% for Version 3) were identified consistently for more than 75% of the runs. The consistency of PHA adjustments improved when the breakpoints corresponded to documented station history metadata events. However, only 19% of the breakpoints (18% for Version 3) were associated with a documented event within 1 year, and 67% (69% for Version 3) were not associated with any documented event. Therefore, while the PHA remains a useful tool in the community's homogenization toolbox, many of the PHA adjustments applied to the homogenized GHCN dataset may have been spurious. Using station metadata to assess the reliability of PHA adjustments might potentially help to identify some of these spurious adjustments. Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2023 Electronic address https://www.mdpi.com/2073-4433/13/2/285
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