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  • 1
    Online Resource
    Online Resource
    Annual chronology and climate response in Abies guatemalensis Rehder (Pinaceae) in Central America
    SAGE Publications ; 2013
    In:  The Holocene Vol. 23, No. 2 ( 2013-02), p. 270-277
    Details
    In: The Holocene, SAGE Publications, Vol. 23, No. 2 ( 2013-02), p. 270-277
    Abstract: The continued expansion of dendroclimatology into Mesoamerica requires the identification and evaluation of species whose rings can be precisely dated and then statistically compared with precipitation and temperature variability in order to make inferences about past climate. Here, we establish the basis for using Abies guatemalensis Rehder (Pinaceae) for climate reconstruction in Central America. Annual crossdating in this montane species is demonstrated at high-elevation sites in the Sierra de los Cuchumatanes in western Guatemala. We find that ring width is most strongly influenced by early growing season moisture conditions, controlled by late dry season rainfall, and negatively correlated with growing season temperature. Our chronology is also significantly negatively correlated with eastern tropical Pacific sea surface temperature anomalies. Our confirmation of annual chronology and the identification of a climatic signal in this species now allow its use in local and regional paleoclimate reconstructions, as well as ecological studies.
    Type of Medium: Online Resource
    ISSN: 0959-6836 , 1477-0911
    URL: Article
    DOI: 10.1177/0959683612455548
    RVK:
    RA 1000
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2013
    detail.hit.zdb_id: 2027956-5
    SSG: 14
    SSG: 3,4
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  • 2
    Online Resource
    Online Resource
    Snowpack signals in North American tree rings
    IOP Publishing ; 2021
    In:  Environmental Research Letters Vol. 16, No. 3 ( 2021-03-01), p. 034037-
    Details
    In: Environmental Research Letters, IOP Publishing, Vol. 16, No. 3 ( 2021-03-01), p. 034037-
    Abstract: Climate change has contributed to recent declines in mountain snowpack and earlier runoff, which in turn have intensified hydrological droughts in western North America. Climate model projections suggest that continued and severe snowpack reductions are expected over the 21st century, with profound consequences for ecosystems and human welfare. Yet the current understanding of trends and variability in mountain snowpack is limited by the relatively short and strongly temperature forced observational record. Motivated by the urgent need to better understand snowpack dynamics in a long-term, spatially coherent framework, here we examine snow-growth relationships in western North American tree-ring chronologies. We present an extensive network of snow-sensitive proxy data to support high space/time resolution paleosnow reconstruction, quantify and interpret the type and spatial density of snow related signals in tree-ring records, and examine the potential for regional bias in the tree-ring based reconstruction of different snow drought types (dry versus warm). Our results indicate three distinct snow-growth relationships in tree-ring chronologies: moisture-limited snow proxies that include a spring temperature signal, moisture-limited snow proxies lacking a spring temperature signal, and energy-limited snow proxies. Each proxy type is based on distinct physiological tree-growth mechanisms related to topographic and climatic site conditions, and provides unique information on mountain snowpack dynamics that can be capitalized upon within a statistical reconstruction framework. This work provides a platform and foundational background required for the accelerated production of high-quality annually resolved snowpack reconstructions from regional to high ( 〈 12 km) spatial scales in western North America and, by extension, will support an improved understanding of the vulnerability of snowmelt-derived water resources to natural variability and future climate warming.
    Type of Medium: Online Resource
    ISSN: 1748-9326
    URL: Article
    DOI: 10.1088/1748-9326/abd5de
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2255379-4
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  • 3
    Online Resource
    Online Resource
    A narrow window of summer temperatures associated with shrub growth in Arctic Alaska
    IOP Publishing ; 2020
    In:  Environmental Research Letters Vol. 15, No. 10 ( 2020-10-01), p. 105012-
    Details
    In: Environmental Research Letters, IOP Publishing, Vol. 15, No. 10 ( 2020-10-01), p. 105012-
    Abstract: Warming in recent decades has triggered shrub expansion in Arctic and alpine tundra, which is transforming these temperature-limited ecosystems and altering carbon and nutrient cycles, fire regimes, permafrost stability, land-surface climate-feedbacks, and wildlife habitat. Where and when Arctic shrub expansion happens in the future will depend in part on how different shrub communities respond to warming air temperatures. Here, we analyze a shrub ring-width network of 18 sites consisting of Salix spp. and Alnus viridis growing across the North Slope of Alaska (68–71 ° N; 164–149 ° W) to assess shrub temperature sensitivity and compare radial growth patterns with satellite NDVI (normalized difference vegetation index) data since 1982. Regardless of site conditions and taxa, all shrubs shared a common year-to-year growth variability and had a positive response to daily maximum air temperatures (Tmax) from ca. May 31 (i.e. Tmax ∼6 ° C) to early July (i.e. Tmax ∼12 ° C), two-thirds of which were significant correlations. Thus, the month of June had the highest shrub growth-temperature sensitivity. This period coincides with the seasonal increase in temperature and phenological green up on the North Slope indicated by both field observations and the seasonal cycle of NDVI (a proxy of photosynthetic activity). Nearly all of the sampled shrubs (98%) initiated their growth after 1960, with 74% initiated since 1980. This post-1980 shrub-recruitment pulse coincided with ∼2 °C warmer June temperatures compared to prior periods, as well as with positive trends in shrub basal area increments and peak summer NDVI. Significant correlations between shrub growth and peak summer NDVI indicate these radial growth patterns in shrubs reflect tundra productivity at a broader scale and that tundra vegetation on the North Slope of Alaska underwent a greening trend between 1980 and 2012.
    Type of Medium: Online Resource
    ISSN: 1748-9326
    URL: Article
    DOI: 10.1088/1748-9326/ab897f
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2255379-4
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  • 4
    Online Resource
    Online Resource
    Multi-scale drought and ocean–atmosphere variability in monsoon Asia
    IOP Publishing ; 2015
    In:  Environmental Research Letters Vol. 10, No. 7 ( 2015-07-01), p. 074010-
    Details
    In: Environmental Research Letters, IOP Publishing, Vol. 10, No. 7 ( 2015-07-01), p. 074010-
    Type of Medium: Online Resource
    ISSN: 1748-9326
    URL: Article
    DOI: 10.1088/1748-9326/10/7/074010
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 2255379-4
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  • 5
    Online Resource
    Online Resource
    Multiscale trends and precipitation extremes in the Central American Midsummer Drought
    IOP Publishing ; 2019
    In:  Environmental Research Letters Vol. 14, No. 12 ( 2019-12-01), p. 124016-
    Details
    In: Environmental Research Letters, IOP Publishing, Vol. 14, No. 12 ( 2019-12-01), p. 124016-
    Abstract: Anecdotal evidence suggests that the timing and intensity of the Central American Midsummer Drought (MSD) may be changing, while observations from limited meteorological station data and paleoclimate reconstructions show neither significant nor consistent trends in seasonal rainfall. Climate model simulations project robust future drying across the region, but internal variability is expected to dominate until the end of the century. Here we use a high-resolution gridded precipitation dataset to investigate these apparent discrepancies and to quantify the spatiotemporal complexities of the MSD. We detect spatially variable trends in MSD timing, the amount of rainy season precipitation, the number of consecutive and total dry days, and extreme wet events at the local scale. At the regional scale, we find a positive trend in the duration, but not the magnitude of the MSD, which is dominated by spatially heterogeneous trends and interannual variability linked to large-scale modes of ocean-atmosphere circulation. Although the current climate still reflects predominantly internal variability, some Central American communities are already experiencing significant changes in local characteristics of the MSD. A detailed spatiotemporal understanding of MSD trends and variability can contribute to evidence-based adaptation planning and help reduce the vulnerability of Central American communities to both natural rainfall variability and anthropogenic change.
    Type of Medium: Online Resource
    ISSN: 1748-9326
    URL: Article
    DOI: 10.1088/1748-9326/ab5023
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2255379-4
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  • 6
    Online Resource
    Online Resource
    Tree growth and vegetation activity at the ecosystem-scale in the eastern Mediterranean
    IOP Publishing ; 2017
    In:  Environmental Research Letters Vol. 12, No. 8 ( 2017-08-01), p. 084008-
    Details
    In: Environmental Research Letters, IOP Publishing, Vol. 12, No. 8 ( 2017-08-01), p. 084008-
    Type of Medium: Online Resource
    ISSN: 1748-9326
    URL: Article
    DOI: 10.1088/1748-9326/aa7b26
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 2255379-4
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  • 7
    Online Resource
    Online Resource
    Spatial patterns of eastern Mediterranean climate influence on tree growth
    SAGE Publications ; 2014
    In:  The Holocene Vol. 24, No. 4 ( 2014-04), p. 381-392
    Details
    In: The Holocene, SAGE Publications, Vol. 24, No. 4 ( 2014-04), p. 381-392
    Abstract: The first large-scale network of 79 tree-ring chronologies in the Eastern Mediterranean and Near East (EMNE; 33°N–42°N, 21°E–43°E) is described and analyzed to identify the seasonal climatic signal in indices of annual ring width. Correlation analysis and cluster analysis are applied to tree-ring data and gridded climate data to assess the climate signal embedded in the network in preparation for climate field reconstructions and formal proxy/model intercomparison experiments. The lengths of the 79 combined chronologies range from 89 to 990 years. The monthly correlations and partial correlations reveal a pervasive positive association with May, June, and sometimes July precipitation, positive correlations with winter and spring (December through April) temperatures, and negative relationships with May through July temperature, although as expected, there are site-to-site exceptions to these general patterns. Cluster analysis suggests three groups of sites based on their association with climate. The chronologies for the EMNE have coherent seasonal precipitation and temperature signals across a fairly broad geographical domain. The predominant signal is a positive growth response to May–June precipitation. Collectively, the findings suggest that the network can be exploited to develop season-specific field reconstructions of precipitation and drought history in the EMNE.
    Type of Medium: Online Resource
    ISSN: 0959-6836 , 1477-0911
    URL: Article
    DOI: 10.1177/0959683613518594
    RVK:
    RA 1000
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2014
    detail.hit.zdb_id: 2027956-5
    SSG: 14
    SSG: 3,4
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  • 8
    Online Resource
    Online Resource
    On the AD 1815 Tambora eruption and the matter of misplaced tree rings
    Past Global Changes (PAGES) ; 2015
    In:  Past Global Change Magazine Vol. 23, No. 2 ( 2015-12), p. 60-61
    Details
    In: Past Global Change Magazine, Past Global Changes (PAGES), Vol. 23, No. 2 ( 2015-12), p. 60-61
    Type of Medium: Online Resource
    ISSN: 2411-605X , 2411-9180
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.22498/pages.23.2
    DOI: 10.22498/pages
    DOI: 10.22498/pages.23.2.60
    Language: Unknown
    Publisher: Past Global Changes (PAGES)
    Publication Date: 2015
    detail.hit.zdb_id: 2779253-5
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  • 9
    Online Resource
    Online Resource
    Climate controls on tree growth in the Western Mediterranean
    SAGE Publications ; 2017
    In:  The Holocene Vol. 27, No. 10 ( 2017-10), p. 1429-1442
    Details
    In: The Holocene, SAGE Publications, Vol. 27, No. 10 ( 2017-10), p. 1429-1442
    Abstract: The first large-scale network of tree-ring chronologies from the western Mediterranean (WM; 32°N–43°N, 10°W–17°E) is described and analyzed to identify the seasonal climatic signal in indices of annual ring width. Correlation and rotated empirical orthogonal function analyses are applied to 85 tree-ring series and corresponding gridded climate data to assess the climate signal embedded in the network. Chronologies range in length from 80 to 1129 years. Monthly correlations and partial correlations show overall positive associations for Pinus halepensis (PIHA) and Cedrus atlantica (CDAT) with winter (December–February) and spring (March–May) precipitation across this network. In both seasons, the precipitation correlation with PIHA is stronger, while CDAT chronologies tend to be longer. A combination of positive correlations between growth and winter–summer precipitation and negative partial correlations with growing season temperatures suggests that chronologies in at least part of the network reflect soil moisture and the integrated effects of precipitation and evapotranspiration signal. The range of climate response observed across this network reflects a combination of both species and geographic influences. Western Moroccan chronologies have the strongest association with the North Atlantic Oscillation.
    Type of Medium: Online Resource
    ISSN: 0959-6836 , 1477-0911
    URL: Article
    DOI: 10.1177/0959683617693901
    RVK:
    RA 1000
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2017
    detail.hit.zdb_id: 2027956-5
    SSG: 14
    SSG: 3,4
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    Online Resource
  • 10
    Online Resource
    Online Resource
    Reconstructing Northeastern United States temperatures using Atlantic white cedar tree rings
    IOP Publishing ; 2017
    In:  Environmental Research Letters Vol. 12, No. 11 ( 2017-11-01), p. 114012-
    Details
    In: Environmental Research Letters, IOP Publishing, Vol. 12, No. 11 ( 2017-11-01), p. 114012-
    Type of Medium: Online Resource
    ISSN: 1748-9326
    URL: Article
    DOI: 10.1088/1748-9326/aa8f1b
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 2255379-4
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