Phenological observations made by the I. R. Bohemian Patriotic–Economic Society, 1828–1847

Brázdil, Rudolf; Bělínová, Monika; Rožnovský, Jaroslav

doi:10.1007/s00704-010-0373-9

Cited by 16 publications

(35 citation statements)

References 22 publications

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“…Various processes have been suggested as possible reasons: inhomogeneity in the target data, air pollution, rapid temperature increase, tree diseases, etc. (Brázdil et al, 2002;Büntgen et al, 2011a;Wilson et al, 2013;Prokop et al, 2017). The whole problem is further complicated by the loss of coherence between TRWI and target data occurring at different times during the 20th century in the abovementioned studies.…”

Section: Uncertainties In the New Reconstructionmentioning

confidence: 99%

“…Brázdil et al (2002) presented reconstruction of March-July precipitation based on TRW of silver fir (Abies alba) from southern Moravia (Czech Republic, CR) for the 1376-1996 period. This database, partly supplemented by TRWs of living and historical firs, was further used for the reconstruction of May-June Z-index variability back to AD 1500 (Büntgen et al, 2011a).…”

Section: Introductionmentioning

confidence: 99%

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May–July precipitation reconstruction from oak tree‐rings for Bohemia (Czech Republic) since AD 1040

Dobrovolný

Rybníček

Kolář

et al. 2017

Intl Journal of Climatology

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This contribution presents a near‐millennium‐long reconstruction of May–July (MJJ) precipitation for Bohemia, the western part of the recent Czech Republic. A well‐replicated chronology of oak (Quercus spp.) tree‐ring width (TRW) measurements covering the 1040–2013 period was employed as a high‐resolution hydroclimatic proxy. Standardized TRW indices were calibrated to selected grid points from the CRU precipitation database, covering the geographical distribution of the oak data used. The oak TRW chronology explains 34% of MJJ precipitation variability during the 1901–1980 period used for calibration. Although the relationship between oak TRW and target data was relatively stable for this period, the coherence drops significantly beyond it. However, two independent verification periods reveal highly positive reduction of error (RE) and coefficient of efficiency (CE) statistics. Less formal verification based on direct comparison with 14 European proxy‐based reconstructions further suggests relatively good agreement in the temporal occurrence of above/below mean late spring–early summer precipitation totals, especially in the 16th–17th centuries. The new MJJ precipitation reconstruction is restricted to inter‐annual and inter‐decadal variability, which is in line with our understanding of natural precipitation variability. Reconstruction reveals two long periods of low precipitation variability, in the 13th–14th centuries and 1630s–1850s. It also demonstrates that precipitation anomalies of larger amplitude and longer duration occurred in the earlier part of the last millennium than those found in the instrumental period. Negative trends in soil moisture content and gradual changes in annual precipitation distribution leading to higher extremity of precipitation regime may be responsible for the lower sensitivity of oaks to precipitation after the 1980s. The new reconstruction does not indicate any exceptional recent decline in MJJ precipitation.

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Section: Uncertainties In the New Reconstructionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

May–July precipitation reconstruction from oak tree‐rings for Bohemia (Czech Republic) since AD 1040

Dobrovolný

Rybníček

Kolář

et al. 2017

Intl Journal of Climatology

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“…Several TRW chronologies were compiled from oaks (Quercus spp.) and their analysis confirmed that they are moisture-sensitive and suitable for hydroclimatic reconstructions (Cedro, 2007;Kern et al, 2009;Büntgen et al, 2010Büntgen et al, , 2011bBronisz et al, 2012;Cooper et al, 2013;Wilson et al, 2013;Rybníček et al, 2015b). There are many more hardwood TRW chronologies in Europe that have, to date, been used exclusively for dating purposes (Kolář et al, 2012) but not as climate proxy archives, mainly because of inadequate sample size (see Tegel et al, 2010 for a review).…”

mentioning

confidence: 90%

“…Numerous records from living trees, historical timber, archaeological remains and sub-fossil wood have been compiled, especially for the mountainous regions, and they have been used for air temperature reconstructions (Büntgen et al, 2005(Büntgen et al, , 2006 and the analysis of temperature extremes (Battipagila et al, 2010). However, a notable number of TRW chronologies exist for sites at lower elevations, largely sensitive to soil-moisture availability Wilson et al, 2005;Büntgen et al, 2011a).…”

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confidence: 99%

A tree-ring perspective on temporal changes in the frequency and intensity of hydroclimatic extremes in the territory of the Czech Republic since 761 AD

Dobrovolný¹,

Rybníček²,

Kolář³

et al. 2015

Preprint

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Abstract. It is generally accepted that anthropogenic-induced climate change may affect the frequency and intensity of hydrological extremes, together with a variety of subsequent impacts on ecosystems and human society. Proxy records that are absolutely dated and annually resolved are indispensable to a better understanding of temporal changes in the occurrence of floods and droughts. This contribution presents a new dataset of 3194 oak (Quercus spp.) ring width samples from living trees and historical timbers, collected across the Czech Republic. A composite tree-ring width (TRW) chronology is developed that best captures the high-frequency extremes over the past 1250 years. The temporal distribution of negative and positive extremes is regular with no indication of clustering. The highest number of negative extremes was found in the 19th century, while positive extremes were most frequent in the 12th century. The lowest number of negative and positive extremes occurred in the 18th and 13th centuries respectively. Negative and positive TRW extremes were compared with the instrumental measurements back to 1805 AD, with documentary-based temperature and precipitation reconstructions from 1804 to 1500, and with documentary evidence before 1500 AD. Negative TRW extremes coincided with above-average March–May and June–August temperature means and below-average precipitation totals. Positive extremes coincided with higher summer precipitation, while temperatures were mostly normal. Mean sea level pressure (SLP) over the European/North Atlantic sector suggested drought for the negative oak TRW extremes, whereas the positive extremes corresponded to wetter conditions overall. More consistent patterns of synoptic SLP were found for negative rather than for positive extremes. Reasons for the possible offset between the oak-based hydroclimatic extremes and their counterparts from meteorological observations and documentary evidence may be manifold and emphasize the need for multi-proxy approaches and proxy-model comparisons.

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“…Büntgen et al, 2010, Büntgen et al 2011a compare extreme values, indicating both wet and dry conditions, between TRW (Tree Ring Width) and documentary or instrumental data. Results from these papers, complemented by data from Dobrovolný et al (2014) were used in constructing Fig.…”

mentioning

confidence: 99%

Tree-rings and people – different views on the 1540 Megadrought. Reply to Büntgen et al. 2015

et al. 2015

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Phenological observations made by the I. R. Bohemian Patriotic–Economic Society, 1828–1847

Cited by 16 publications

References 22 publications

May–July precipitation reconstruction from oak tree‐rings for Bohemia (Czech Republic) since AD 1040

May–July precipitation reconstruction from oak tree‐rings for Bohemia (Czech Republic) since AD 1040

A tree-ring perspective on temporal changes in the frequency and intensity of hydroclimatic extremes in the territory of the Czech Republic since 761 AD

Tree-rings and people – different views on the 1540 Megadrought. Reply to Büntgen et al. 2015

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