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| Titel |
Process based model sheds light on climate sensitivity of Mediterranean tree-ring width |
| VerfasserIn |
R. Touchan, V. V. Shishov, D. M. Meko, I. Nouiri, A. Grachev |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 3 ; Nr. 9, no. 3 (2012-03-09), S.965-972 |
| Datensatznummer |
250006837
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| Publikation (Nr.) |
 copernicus.org/bg-9-965-2012.pdf |
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| Zusammenfassung |
| We use the process-based VS (Vaganov-Shashkin) model to investigate whether
a regional Pinus halepensis tree-ring chronology from Tunisia can be simulated as a function
of climate alone by employing a biological model linking day length and
daily temperature and precipitation (AD 1959–2004) from a climate station to
ring-width variations. We check performance of the model on independent data
by a validation exercise in which the model's parameters are tuned using
data for 1982–2004 and the model is applied to generate tree-ring indices
for 1959–1981. The validation exercise yields a highly significant positive
correlation between the residual chronology and estimated growth curve
(r=0.76 p<0.0001, n=23). The model shows that the average duration of the
growing season is 191 days, with considerable variation from year to year.
On average, soil moisture limits tree-ring growth for 128 days and
temperature for 63 days. Model results depend on chosen values of
parameters, in particular a parameter specifying a balance ratio between
soil moisture and precipitation. Future work in the Mediterranean region
should include multi-year natural experiments to verify patterns of
cambial-growth variation suggested by the VS model. |
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