Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
Clim. Past, 12, 1421-1434, 2016
https://doi.org/10.5194/cp-12-1421-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
05 Jul 2016
April–August temperatures in the Czech Lands, 1499–2015, reconstructed from grape-harvest dates
Martin Možný1, Rudolf Brázdil2,3, Petr Dobrovolný2,3, and Miroslav Trnka3,4 1Czech Hydrometeorological Institute, Doksany Observatory, 41182 Doksany, Czech Republic
2Institute of Geography, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic
3Global Change Research Institute AS CR, Bělidla 986/4a, 603 00 Brno, Czech Republic
4Faculty of Agronomy, Mendel University in Brno, Zemědělská 1, 603 00 Brno, Czech Republic
Abstract. Viticulture has long been essential to the commercial and social well-being of parts of the Czech Lands (now the Czech Republic), and detailed records have been kept for centuries of the timing and relative success of the grape crop. Using such documentary data from the Bohemian wine-growing region (mainly northwest of the capital, Prague), series of grape-harvest dates (GHDs) were created for the 1499–2015 period. Because the link between harvest dates and temperatures is strong, GHD series, together with instrumental mean temperature series starting in 1801, were used to reconstruct mean April–August temperatures for the region from 1499 to 2015. Linear regression (LR) and variance scaling (VS) methods were used for calibration and compared in terms of explained variance and their ability to capture extreme values. It emerged that LR does not significantly underestimate temperature variability. However, VS shows far greater capacity to capture extremes. GHDs explain 64 % of temperature variability over the full calibration period. The 1986–2015 period was identified as the warmest 30-year period of the past 514 years, an observation consistent with recent global warming. The highest April–August temperatures appeared in a reconstruction for the year 1540, which was warmer than the next two very warm, and far more recent, seasons in 2003 and 2015. The coldest period occurred at the beginning of the 20th century (1900–1929). The series reconstructed for the Czech Lands is in close agreement with other (central) European reconstructions based on other proxies. The series created here makes an important contribution to a better understanding of long-term spatiotemporal temperature variability in central Europe.

Citation: Možný, M., Brázdil, R., Dobrovolný, P., and Trnka, M.: April–August temperatures in the Czech Lands, 1499–2015, reconstructed from grape-harvest dates, Clim. Past, 12, 1421-1434, https://doi.org/10.5194/cp-12-1421-2016, 2016.
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Short summary
April–August temperature reconstruction for the Czech Lands based on grape-harvest dates in the 1499–2012 period constitutes a further important contribution to the better understanding of long-term spatiotemporal temperature variability in central Europe and includes the very long overlap period (1801–2012) used for calibration and verification, the consistent dominance of Pinot varieties through time, and the stability of vineyard management throughout the period reconstructed.
April–August temperature reconstruction for the Czech Lands based on grape-harvest dates in the...
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