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  • 1
    Publication Date: 2018-01-10
    Description: Author Posting. © The Author(s), 2016. This is the author's version of the work. It is posted here under a nonexclusive, irrevocable, paid-up, worldwide license granted to WHOI. It is made available for personal use, not for redistribution. The definitive version was published in Climate Dynamics 49 (2017): 143-161, doi:10.1007/s00382-016-3332-z.
    Description: Tree rings are natural archives that annually record distinct types of past climate variability depending on the parameters measured. Here, we use ring-width and stable isotopes in cellulose of trees from the northwestern Iberian Peninsula (IP) to understand regional summer hydroclimate over the last 400 years and the associated atmospheric patterns. Spatial correlations between tree rings and gridded climate products demonstrate that isotope signatures in the targeted Iberian pine forests are very sensitive to water availability during the summer period, and are mainly controlled by stomatal conductance. Non-linear methods based on extreme events analysis allow for capturing distinct seasonal climatic variability recorded by tree-ring parameters and asymmetric signals of the associated atmospheric features. Moreover, years with extreme high (low) values in the tree-ring records were characterised by coherent large-scale atmospheric circulation patterns with reduced (enhanced) moisture transport onto the northwestern IP. These analyses of extremes revealed that high/low proxy values do not necessarily correspond to mirror images in the atmospheric anomaly patterns, suggesting different drivers of these patterns and the corresponding signature recorded in the proxies. Regional hydroclimate features across the broader IP and western Europe during extreme wet/dry summers detected by the northwestern IP trees compare favourably to an independent multicentury sea level pressure and drought reconstruction for Europe. These independent sources of past climate validate our findings that attribute non-linear moisture signals recorded by extreme tree-ring values to distinct large-scale atmospheric patterns and allow for 400-yr reconstructions of the frequency of occurrence of extreme conditions in summer hydroclimate.
    Description: This research was partially supported by the EU project ISONET (Contract EV K2-2001-00237) and the EU FP6 project Millennium (GOCE 017008). L.A.H. was supported by the Marie Curie International Outgoing Fellowship PIOF-GA-2009-253277 grant within the FP7-PEOPLE-2009-IOF program. CCU was supported by the the Penzance and John P. Chase Memorial Endowed Funds and the Investment in Science Fund at WHOI.
    Keywords: Tree rings ; Extreme analyses ; Atmospheric circulation ; Hydroclimate ; Sea Level Pressure (SLP) ; Old World Drought Atlas (OWDA) ; Iberian Peninsula
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
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  • 2
    Publication Date: 2014-11-25
    Description: EXTRACT (SEE PDF FOR FULL ABSTRACT): The characterization of inter-decadal climate variability in the Southern Hemisphere is severely constrained by the shortness of the instrumental climate records. To help relieve this constraint, we have developed and analyzed a reconstruction of warm-season (November-April) temperatures from Tasmanian tree rings that now extends back to 800 BC. A detailed analysis of this reconstruction in the time and frequency domains indicates that much of the inter-decadal variability is principally confined to four frequency bands with mean periods of 31, 57, 77, and 200 years. ... In so doing, we show how a future greenhouse warming signal over Tasmania could be masked by these natural oscillations unless they are taken into account.
    Keywords: Atmospheric Sciences
    Repository Name: Aquatic Commons
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: application/pdf
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