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    Seasonal and synoptic climatic drivers of tree growth in the Bighorn Mountains, WY, USA (1654–1983 CE)

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    Hudsonetal2019Dendrochronologia.pdf
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    Final Accepted Manuscript
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    Author
    Hudson, Amy R.
    Alfaro-Sanchez, Raquel
    Babst, Flurin
    Belmecheri, Soumaya
    Moore, David J.P.
    Trouet, Valerie cc
    Affiliation
    Univ Arizona, Sch Nat Resources & Environm
    Univ Arizona, Lab Tree Ring Res
    Issue Date
    2019-12
    Keywords
    Ring width
    Maximum latewood density
    Bighorn Mountains, Wyoming
    Picea engelmannii
    Pinus contorta
    Pseudotsuga rnenziesii
    
    Metadata
    Show full item record
    Publisher
    ELSEVIER GMBH
    Citation
    Hudson, A. R., Alfaro-Sanchez, R., Babst, F., Belmecheri, S., Moore, D. J. P., & Trouet, V. (2019). Seasonal and synoptic climatic drivers of tree growth in the Bighorn Mountains, WY, USA (1654–1983 CE). Dendrochronologia, 58, 125633. https://doi.org/10.1016/j.dendro.2019.125633 ‌
    Journal
    DENDROCHRONOLOGIA
    Rights
    Copyright © 2019 Elsevier GmbH. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    In the United States' (US) Northern Rockies, synoptic pressure systems and atmospheric circulation drive interannual variation in seasonal temperature and precipitation. The radial growth of high-elevation trees in this semi-arid region captures this temperature and precipitation variability and provides long time series to contextualize instrumental-era variability in synoptic-scale climate patterns. Such variability in climate patterns can trigger extreme climate events, such as droughts, floods, and forest fires, which have a damaging impact on human and natural systems. We developed 11 tree-ring width (TRW) chronologies from multiple species and sites to investigate the seasonal climatic drivers of tree growth in the Bighorn Mountains, WY. A principal component analysis of the chronologies identified 54% of shared common variance (1894-2014). Tree growth (expressed by PC1) was driven by multiple seasonal climate variables: previous October and current July temperatures, as well as previous December and current April precipitation, had a positive influence on growth, whereas growth was limited by July precipitation. These seasonal growth-climate relationships corresponded to circulation patterns at higher atmospheric levels over the Bighorn Mountains. Tree growth was enhanced when the winter jet stream was in a northward position, which led to warmer winters, and when the spring jet stream was further south, which led to wetter springs. The second principal component, explaining 19% of the variance, clustered sites by elevation and was strongly related to summer temperature. We leverage this summer temperature signal in our TRW chronologies by combining it with an existing maximum latewood density (MXD) chronology in a nested approach. This allowed us to reconstruct Bighorn Mountains summer (June, July, and August) temperature (BMST) back to 1654, thus extending the instrumental temperature record by 250 years. Our BMST reconstruction explains 39-53% of the variance in regional summer temperature variability. The 1830s were the relatively coolest decade and the 1930s were the warmest decade over the reconstructed period (1654-1983 CE) - which excludes the most recent 3 decades. Our results contextualize recent drivers and trends of climate variability in the US Northern Rockies, which contributes to the information that managers of human and natural systems need in order to prepare for potential future variability.
    Note
    24 month embargo; published online: 1 December 2019
    ISSN
    1125-7865
    DOI
    10.1016/j.dendro.2019.125633
    Version
    Final accepted manuscript
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.dendro.2019.125633
    Scopus Count
    Collections
    UA Faculty Publications

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