Tree-ring-based reconstruction of precipitation in the Bighorn Basin, Wyoming, since 1260 A.D

Journal of Climate
By: , and 



Cores and cross sections from 79 Douglas fir (Pseudotsuga menziesii) and limber pine (Pinus flexilis) trees at four sites in the Bighorn Basin of north-central Wyoming and south-central Montana were used to develop a proxy for annual (June-June) precipitation spanning 1260-1998 A.D. The reconstruction exhibits considerable nonstationarity, and the instrumental era (post-1900) in particular fails to capture the full range of precipitation variability experienced in the past ???750 years. Both single-year and decadal-scale dry events were more severe before 1900. Dry spells in the late thirteenth and sixteenth centuries surpass both magnitude and duration of any droughts in the Bighorn Basin after 1900. Precipitation variability appears to shift to a higher-frequency mode after 1750, with 15-20-yr droughts becoming rare. Comparisons between instrumental and reconstructed values of precipitation and indices of Pacific basin variability reveal that precipitation in the Bighorn Basin generally responds to Pacific forcing in a manner similar to that of the southwestern United States (drier during La Nin??a events), but high country precipitation in areas surrounding the basin displays the opposite response (drier during El Nin??o events). ?? 2004 American Meteorological Society.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Tree-ring-based reconstruction of precipitation in the Bighorn Basin, Wyoming, since 1260 A.D
Series title Journal of Climate
DOI 10.1175/1520-0442(2004)017<3855:TROPIT>2.0.CO;2
Volume 17
Issue 19
Year Published 2004
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Journal of Climate
First page 3855
Last page 3865
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