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| Titel |
An open-access database of grape harvest dates for climate research: data description and quality assessment |
| VerfasserIn |
V. Daux, I. García de Cortázar-Atauri, P. Yiou, I. Chuine, E. Garnier, E. Le Roy Ladurie, O. Mestre, J. Tardaguila |
| 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 ; 8, no. 5 ; Nr. 8, no. 5 (2012-09-03), S.1403-1418 |
| Datensatznummer |
250005831
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| Publikation (Nr.) |
 copernicus.org/cp-8-1403-2012.pdf |
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| Zusammenfassung |
We present an open-access dataset of grape harvest dates (GHD) series that
has been compiled from international, French and Spanish literature and from
unpublished documentary sources from public organizations and from
wine-growers. As of June 2011, this GHD dataset comprises 380 series mainly
from France (93% of the data) as well as series from Switzerland, Italy,
Spain and Luxemburg. The series have variable length (from 1 to 479 data,
mean length of 45 data) and contain gaps of variable sizes (mean ratio of
observations/series length of 0.74). The longest and most complete ones are
from Burgundy, Switzerland, Southern Rhône valley, Jura and
Ile-de-France. The most ancient harvest date of the dataset is in 1354 in
Burgundy.
The GHD series were grouped into 27 regions according to their location, to
geomorphological and geological criteria, and to past and present grape
varieties. The GHD regional composite series (GHD-RCS) were calculated and
compared pairwise to assess their reliability assuming that series close to
one another are highly correlated. Most of the pairwise correlations are
significant (p-value < 0.001) and strong (mean pairwise correlation
coefficient of 0.58). As expected, the correlations tend to be higher when
the vineyards are closer. The highest correlation (R = 0.91) is obtained
between the High Loire Valley and the Ile-de-France GHD-RCS.
The strong dependence of the vine cycle on temperature and, therefore, the
strong link between the harvest dates and the temperature of the growing
season was also used to test the quality of the GHD series. The strongest
correlations are obtained between the GHD-RCS and the temperature series of
the nearest weather stations. Moreover, the GHD-RCS/temperature correlation
maps show spatial patterns similar to temperature correlation maps. The
stability of the correlations over time is explored. The most striking
feature is their generalised deterioration at the late 19th–early 20th
century. The possible effects on GHD of the phylloxera crisis, which
took place at this time, are discussed.
The median of all the standardized GHD-RCS was calculated. The distribution
of the extreme years of this general series is not homogenous. Extremely
late years all occur during a two-century long time window from the early
17th to the early 19th century, while extremely early years are
frequent
during the 16th and since the mid-19th century. |
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