Juniper Tree-Ring Data from the Kuramin Range (Northern Tajikistan) Reveals Changing Summer Drought Signals in Western Central Asia
| Autor: | Ahsan Ahmadov, Ruibo Zhang, Feng Chen, Andrea Seim, Shulong Yu, Zainalobudin V. Kobuliev, Hans W. Linderholm, Tongwen Zhang, Anvar Kodirov |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Tajikistan
synoptic climatology analysis 010506 paleontology 010504 meteorology & atmospheric sciences biology Range (biology) Central asia Forestry lcsh:QK900-989 biology.organism_classification 01 natural sciences tree rings El Niño Southern Oscillation Geography Period (geology) lcsh:Plant ecology Kuramin Range Spectral analysis Juniper Physical geography Tree ring data drought reconstruction 0105 earth and related environmental sciences Chronology |
| Zdroj: | Forests, Vol 10, Iss 6, p 505 (2019) Forests Volume 10 Issue 6 |
| ISSN: | 1999-4907 |
| Popis: | Coniferous forests cover the mountains in many parts of Central Asia and provide large potentials for dendroclimatic studies of past climate variability. However, to date, only a few tree-ring based climate reconstructions exist from this region. Here, we present a regional tree-ring chronology from the moisture-sensitive Zeravshan juniper (Juniperus seravschanica Kom.) from the Kuramin Range (Tajikistan) in western Central Asia, which is used to reveal past summer drought variability from 1650 to 2015 Common Era (CE). The chronology accounts for 40.5% of the variance of the June&ndash July self-calibrating Palmer Drought Severity Index (scPDSI) during the instrumental period (1901 to 2012). Seven dry periods, including 1659&ndash 1696, 1705&ndash 1722, 1731&ndash 1741, 1758&ndash 1790, 1800&ndash 1842, 1860&ndash 1875, and 1931&ndash 1987, and five wet periods, including 1742&ndash 1752, 1843&ndash 1859, 1876&ndash 1913, 1921&ndash 1930, and 1988&ndash 2015, were identified. Good agreements between drought records from western and eastern Central Asia suggest that the PDSI records retain common drought signals and capture the regional dry/wet periods of Central Asia. Moreover, the spectral analysis indicates the existence of centennial (128 years), decadal (24.3 and 11.4 years), and interannual (8.0, 3.6, 2.9, and 2.0 years) cycles, which may be linked with climate forces, such as solar activity and El Niñ o-Southern Oscillation (ENSO). The analysis between the scPDSI reconstruction and large-scale atmospheric circulations during the reconstructed extreme dry and wet years can provide information about the linkages of extremes in our scPDSI record with the large-scale ocean&ndash atmosphere&ndash land circulation systems. |
| Databáze: | OpenAIRE |
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