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    Douglas-fir radial growth in interior British Columbia can be linked to long-term oscillations in Pacific and Atlantic sea surface temperatures

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    Lo et al 2016 CJFR post-print.pdf (1.814Mb)
    Date
    2017
    Author
    Lo, Yueh-Hsin Upna
    Blanco Vaca, Juan Antonio Upna
    Guan, Biing T. 
    Version
    Acceso abierto / Sarbide irekia
    Type
    Artículo / Artikulua
    Version
    Versión aceptada / Onetsi den bertsioa
    Project Identifier
    EC/FP7/326718 openaire 
    ES/6PN/AGL2012-33465 
    Impact
     
     
     
    10.1139/cjfr-2016-0203
     
     
     
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    Abstract
    A major problem in modern dendrochronology is that the methods traditionally used for linking tree ring growth data to climate records are not well suited to reconstructing low-frequency climatic variations. In this study, we explored the alternative Ensemble Empirical Mode Decomposition to detrend tree-ring records and to extract climate signals without removing low-frequency information. Tree c ... [++]
    A major problem in modern dendrochronology is that the methods traditionally used for linking tree ring growth data to climate records are not well suited to reconstructing low-frequency climatic variations. In this study, we explored the alternative Ensemble Empirical Mode Decomposition to detrend tree-ring records and to extract climate signals without removing low-frequency information. Tree cores of Pseudotsuga menziesii var. glauca (Mayr.) Franco were examined in a semi-arid forest in southern interior British Columbia, western Canada. Ring width data were decomposed into five oscillatory components (intrinsic mode functions, IMFs) of increasingly longer periodicities. IMF 1 was considered white noise, IMF 2 was used to create the first diameter growth index (DGI-1), IMF 3 and IMF 4 were combined to create the second diameter growth index (DGI-2), whereas IMF 5 and the residual term together were considered as the trend term. The highest significant cross-correlations between DGI-1 and the NAOAugust, NIÑO12May, and PDOJanuary indices were found at 1-year lags. DGI-2 had positive and persistent correlations with NAOJune and PDOMay at 0 to 3 years lags, and with NAOMay at 2 and 3 years lags. Our results indicate that periods of slow growth in the tree ring record matched periods of drought in the North American Pacific Northwest. Such water limiting conditions are likely caused by oscillatory patterns in the Pacific Ocean sea surface temperatures that influence precipitation in the Pacific Northwest. These drought events are likely exacerbated by changes in winter precipitation (snowpack) related to oscillations of the Atlantic Ocean sea surface temperatures, highlighting the ecological effects of both oceans on terrestrial ecosystems. Such relationships could not be easily found by traditional tree-ring analysis that remove some of the low-frequency signal, and therefore we suggest Ensemble Empirical Mode Decomposition as an additional tool to establishing tree growth-climate relationships. [--]
    Subject
    Growth-climate relationships, Ensemble Empirical Mode Decomposition (EEMD), Dendroclimatology, Decadal climate oscillations, Low-frequency climate oscillations
     
    Publisher
    NCR Research Press
    Published in
    Canadian Journal of Forest Research 47:371-381
    Departament
    Universidad Pública de Navarra. Departamento de Ciencias del Medio Natural / Nafarroako Unibertsitate Publikoa. Natura Ingurunearen Zientziak Saila
     
    Publisher version
    https://dx.doi.org/10.1139/cjfr-2016-0203
    URI
    https://hdl.handle.net/2454/23443
    Sponsorship
    Juan A. Blanco was supported by grants from the Spanish Ministry of Economy and Competitiveness (AGL2012-33465), a Marie Curie Action fellowship from the European Commission (CIG-2012-326718-ECOPYREN3), and a Campus Iberus grant for mobility of research staff.
    Appears in Collections
    • Artículos de revista DCMN - NIZS Aldizkari artikuluak [85]
    • Artículos de revista - Aldizkari artikuluak [3040]
    • Investigaciones financiadas por la Unión Europea (OpenAire) - Europar Batasunak finantzatutako ikerketak (OpenAire) [105]
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