A 545-Year Drought Reconstruction for Central Oregon
| Autor: | Karen B. Arabas, Kelly A. Pohl, Keith S. Hadley |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Atmospheric Science
biology Weak relationship Southern oscillation Forestry Dendroclimatology biology.organism_classification Geography El Niño Southern Oscillation Climatology Juniperus occidentalis Earth and Planetary Sciences (miscellaneous) General Earth and Planetary Sciences Juniper Pacific decadal oscillation General Environmental Science Chronology |
| Zdroj: | Physical Geography. 23:302-320 |
| ISSN: | 1930-0557 0272-3646 |
| Popis: | Using a 545-year ponderosa pine (Pinus ponderosa) tree-ring chronology, we examine the drought history of central Oregon to: (1) determine the relationship among drought, ENSO (El Nino/Southern Oscillation), and the PDO (Pacific Decadal Oscillation), and (2) compare the climatic sensitivity of ponderosa pine and western juniper (Juniperus occidentalis) to determine their suitability as interchangeable climate proxies. Our climatic reconstruction explained 35% of the variance in historical Palmer's Drought Severity Index (PDSI) values and revealed severe drought periods during the 1480s, 1630s, 1700s, and 1930s. The most sustained drought period in our reconstruction occurred during the 1930s, with the most severe single drought year occurring in 1489. We found a significant (p ≤ .01) but weak relationship between our ponderosa pine chronology and ENSO and the PDO, explaining 9% and 12% of the variation respectively. Both ponderosa pine and western juniper record periods of severe regional drought, but wes... |
| Databáze: | OpenAIRE |
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