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| Titel |
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 |
| VerfasserIn |
P. Dobrovolny, M. Rybníček, T. Kolář, R. Brázdil, M. Trnka, U. Büntgen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 11, no. 10 ; Nr. 11, no. 10 (2015-10-23), S.1453-1466 |
| Datensatznummer |
250117441
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| Publikation (Nr.) |
 copernicus.org/cp-11-1453-2015.pdf |
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| Zusammenfassung |
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 data set 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. |
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