Climatic analysis of pointer years in tree-ring chronologies from northern Iran and neighboring high mountain areas
Pourtahmasi K, Parsapajouh D, Bräuning A, Esper J, Schweingruber FH (2007)
Publication Language: English
Publication Type: Journal article
Publication year: 2007
Journal
Publisher: Universität Göttingen
Book Volume: 28
Pages Range: 27-42
URI: https://www.uni-goettingen.de/de/2007/153977.html
Abstract
Juniperus polycarpos is a widely distributed tree species growing at the upper timberline in the
mountain regions of northern Iran. According to correlation analyses between ring width index
chronologies with local meteorological data, ring width is positively influenced by high spring and early summer rainfall and by warmer temperature in December prior to the growth season. Pointer years of extremely low and high values of tree growth during the 20th century were extracted by applying the so called Cropper technique. The spatial distribution and climatologic background of these pointer years was examined within a regional chronology network of 15 high elevation treering sites enclosing Turkey, Iran, southern Russia, Kirghizia, Pakistan, Nepal and the Tibetan Plateau. The results show that the similarity of growth reactions at the north Iranian sites is greater with Asian high mountain regions than with the eastern Mediterranean area. Negative pointer years with a wide distribution within the study area are more common (1913, 1917, 1951, 1961, 1975, 1991) than positive pointer years (1940, 1981). The climatic analysis of pointer years and their relationship to certain modes of the atmospheric circulation can provide a basis for the interpretation of similar distribution patterns of pointer years further back in the past.
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Iran, Islamic Republic of (IR)How to cite
APA:
Pourtahmasi, K., Parsapajouh, D., Bräuning, A., Esper, J., & Schweingruber, F.H. (2007). Climatic analysis of pointer years in tree-ring chronologies from northern Iran and neighboring high mountain areas. Geo-Öko, 28, 27-42.
MLA:
Pourtahmasi, Kambiz, et al. "Climatic analysis of pointer years in tree-ring chronologies from northern Iran and neighboring high mountain areas." Geo-Öko 28 (2007): 27-42.
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