Blue intensity from a tropical conifer’s annual rings for climate reconstruction: An ecophysiological perspective

Buckley, Brendan M.; Hansen, Kyle; Griffin, Kevin L.; Schmiege, Stephanie C.; Oelkers, Rose; D’Arrigo, Rosanne; Stahle, D. W.; Davi, Nicole; Nguyễn, Trần Quốc Trung; Le, Canh Nam; Wilson, Rob

doi:10.1016/j.dendro.2018.04.003

Cited by 52 publications

(49 citation statements)

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“…For this study we used three previously published, indexed ring-width records from F. hodginsii (of the family Cupressaceae, henceforth referred to as cypress), the most reliable long-lived dendroclimatic responder yet found from the Asian tropics. These records are the Mu Cang Chai F. hodginsii (MCFH) from northern (Sano et al 2008(Sano et al , 2012, Quang Nam F. hodginsii (QNFH) from central (Buckley et al 2017(Buckley et al , 2018 and the Bidoup Nui Ba F. hodginsii (BDFH) from southern Vietnam (Buckley et al 2010(Buckley et al , 2014, respectively. The two new cypress tree-ring records are from Pu Mat National Park in the north (PMFH), and the Kon Tum area in central Vietnam (KKFH).…”

Section: A Vietnamese Cypress Ring-width Networkmentioning

confidence: 99%

“…Fig. 1 Locations of the Fokienia hodginsii (FH) core collections used for this study: 1 = Mu Cang Chai or MCFH (Sano et al 2008); 2 = Pu Mat National Park or PMFH (this study); 3 = Quang Nam Protected Forest or QNFH (Buckley et al 2017(Buckley et al , 2018; 4 = Kon Tum region including Ka Kinh National Park or KKFH (this study); and 5 = Bidoup Nui Ba National Park or BDFH (Buckley et al 2010 Each ring-width time series (including the three previously published records) was detrended and normalized using the relatively new method of "signal free" standardization (Melvin et al 2007;Briffa and Melvin 2011;Melvin and Briffa 2014), as used and described by Buckley et al (2017Buckley et al ( , 2018 for the cypress site in central Vietnam (QNFH in Fig. 1).…”

Section: A Vietnamese Cypress Ring-width Networkmentioning

confidence: 99%

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Interdecadal Pacific Oscillation reconstructed from trans-Pacific tree rings: 1350–2004 CE

et al. 2019

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The interdecadal Pacific Oscillation (IPO) represents the decadal mode of the El Niño-Southern Oscillation phenomenon. As such the IPO is one of the dominant modes of decadal climate variability on both sides of the Pacific Ocean basin. For this paper we utilized a newly developed tree-ring data network comprised of five multi-centennial Vietnamese cypress ring-width chronologies that range from around 11°N-23°N latitude. We combined these data with an average of tree-ring derived drought indices from the North American Drought Atlas over the south central USA, from a box that spans from 27.5°N-35.0°N, 85.0°-110.0°W and contains 55 gridpoints and more than 100 tree ring site chronologies, these 2 locations exhibit rainfall variations that are strongly, negatively correlated with each other and are representative of the influence of the IPO on terrestrial rainfall. The final reconstruction model, weighted most heavily on the three most southerly of the five Vietnamese cypress records, spans from 1350 to 2004, and explains nearly 57% of the variance in the original IPO data for the 5-month season of October-February. The reconstruction model passes all standard statistical tests using a split calibrationverification scheme. We reveal 15 positive and 15 negative phase shifts of the IPO prior to the period of instrumentation, suggesting that the IPO has been active for at least the past seven centuries with varying degrees of intensity. We compare our reconstruction with two related millennial records: the MacDonald and Case (Geophys Res Lett 32(8):L08703, 2005) tree ring-derived reconstruction of the Pacific Decadal Oscillation, and an ice core-derived reconstruction of the IPO from the Law Dome Ice core in Antarctica by Vance et al. (Geophys Res Lett 33(6):L06712, 2015). While there is good general agreement with the latter record, there are three key periods of the past where the two records are out of phase, and we explore the reasons for this disparity. Direct comparison with the related Tripole Index (TPI) shows weaker correlation, likely owing to the stronger relationship between our tree ring data and the equatorial Pacific region relative to the north and south regions of the Pacific that combine to comprise the TPI calculation.

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Section: A Vietnamese Cypress Ring-width Networkmentioning

confidence: 99%

Section: A Vietnamese Cypress Ring-width Networkmentioning

confidence: 99%

Interdecadal Pacific Oscillation reconstructed from trans-Pacific tree rings: 1350–2004 CE

et al. 2019

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“…From the images, BI profiles can be produced with multiple types of specialized software including WinDendro (Campbell et al, ; Guay et al, ), CDendro/CooRecorder (Larsson, ; Rydval et al, ), Lignovision (http://www.rinntech.com/), or generic image analysis software such as Image Pro Plus (Media Cybernetics, USA) or ImageJ (developed by W. Rasband, National Institutes of Health, Bethesda, MD, USA). When analyzing resulting measurements, discoloration or staining of samples (including pronounced heartwood‐sapwood color differences in some conifers, discoloration caused by the action of fungal and bacterial agents and decay, staining caused by resins and other extractives) has been found to induce biases in the trends of latewood BI series (e.g., Björklund et al, , ; Buckley et al, ; Rydval et al, ). Although refluxing tree cores in acetone, ethanol, toluene:ethanol, or even peroxide, usually with a Soxhlet apparatus (https://en.wikipedia.org/wiki/Soxhlet_extractor, accessed Jan 2019), has been applied as a way to remove extractives, the treatment is imperfect as it only reduces discoloration related to mobile substances and so does not eliminate discoloration biases entirely (Björklund et al, ; Rydval et al, ; Sheppard & Wiedenhoeft, ; Sheppard, ).…”

Section: Primary and Currently Applied Microdensitometric Techniquesmentioning

confidence: 99%

“…Despite limitations, maximum BI has featured in a number of climate response and reconstruction studies (primarily summer temperature) that have been partly (or entirely) derived from this parameter, covering many regions, including northern (Björklund et al, ; Fuentes et al, ; Linderholm et al, ; McCarroll et al, ), northwest (Rydval, Gunnarson, et al, , Rydval, Loader, et al, ; Tene et al, ; Wilson et al, ), western (Trachsel et al, ), and eastern Europe (Kaczka et al, , ; Rydval et al, ), North America (Wilson et al, ; Wilson, D'Arrigo, et al, ), and the Caucasus (Dolgova, ). The parameter has also been included in large‐scale (hemispheric) reconstructions of temperature (Anchukaitis et al, ; Wilson et al, ) and the development of a temperature reconstruction in the tropics (Buckley et al, ). As a result of its relative ease of development, maximum BI has also found applications in dendroarchaeology by assisting in the dating of historical wooden material from conifers with potential applications also in the provenancing of historical wood (Mills et al, ; Spyt et al, ; Wilson, Wilson, et al, ).…”

Section: Primary and Currently Applied Microdensitometric Techniquesmentioning

confidence: 99%

“…Second, trend differences may be detected if some techniques are more sensitive to heartwood‐sapwood transitions. This is the case for BI technique (Björklund et al, , ; Buckley et al, ; Rydval et al, ) but may also affect X‐ray techniques if resin extraction is omitted (Helama et al, ; Schweingruber et al, ). Aligning mxd chronologies from both BI and X‐ray techniques on heartwood/sapwood dates instead of calendar dates reveals that there is a small negative step around the time of heartwood/sapwood transition (Figure S7).…”

Section: Synthesis Of Empirical Findings and Existing Knowledgementioning

confidence: 99%

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Scientific Merits and Analytical Challenges of Tree‐Ring Densitometry

Björklund

Arx

Nievergelt

et al. 2019

Reviews of Geophysics

113

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X-ray microdensitometry on annually resolved tree-ring samples has gained an exceptional position in last-millennium paleoclimatology through the maximum latewood density (MXD) parameter, but also increasingly through other density parameters. For 50 years, X-ray based measurement techniques have been the de facto standard. However, studies report offsets in the mean levels for MXD measurements derived from different laboratories, indicating challenges of accuracy and precision. Moreover, reflected visible light-based techniques are becoming increasingly popular, and wood anatomical techniques are emerging as a potentially powerful pathway to extract density information at the highest resolution. Here we review the current understanding and merits of wood density for tree-ring research, associated microdensitometric techniques, and analytical measurement challenges. The review is further complemented with a careful comparison of new measurements derived at 17 laboratories, using several different techniques. The new experiment allowed us to corroborate and refresh "long-standing wisdom" but also provide new insights. Key outcomes include (i) a demonstration of the need for mass/volume-based recalibration to accurately estimate average ring density; (ii) a substantiation of systematic differences in MXD measurements that cautions for great care when combining density data sets for climate reconstructions; and (iii) insights into the relevance of analytical measurement resolution in signals derived from tree-ring density data. Finally, we provide recommendations expected to facilitate future inter-comparability and interpretations for global change research.Plain Language Summary Paleoclimatology, the study of how the climate has changed throughout earth history, is an important component of climate change research. The wood density of tree

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Multi-Proxy, Multi-Season Streamflow Reconstruction with Mass Balance Adjustment

Nguyen

Galelli

et al. 2020

Preprint

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Dendrohydrology, the study of past hydroclimate using tree rings, has been largely motivated by water resources management. The field traces back to Hardman and Reil (1936), who recognized that instrumental records were too short to understand drought trends and demonstrated that better understanding could be gained from exploring the links between tree rings and streamflow. Their work was motivated by contemporary droughts in California that affected irrigation. At the same time, Hawley (1937) found strong correlations between tree rings and streamflow in Tennessee, USA, and was probably the first to show the lagged relationship of streamflow to tree rings. Also to understand droughts, Schulman (1945) established a tree ring chronology for the Colorado River Basin, this time motivated by the war effort-to examine Hoover Dam's hydropower production reliability to meet wartime demand. While these early works stopped at studying tree ring indices, dendrohydrology took a big step when Stockton (1971), leveraging advanced multivariate techniques (Fritts et al., 1971), showed that reconstructing streamflow record back in time was feasible-long term surface water availability could now be quantified directly. Soon, multiple streamflow reconstructions were developed across the Colorado River Basin (Stockton & Jacoby, 1976), revealing the

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Blue intensity from a tropical conifer’s annual rings for climate reconstruction: An ecophysiological perspective

Cited by 52 publications

References 50 publications

Interdecadal Pacific Oscillation reconstructed from trans-Pacific tree rings: 1350–2004 CE

Interdecadal Pacific Oscillation reconstructed from trans-Pacific tree rings: 1350–2004 CE

Scientific Merits and Analytical Challenges of Tree‐Ring Densitometry

Multi-Proxy, Multi-Season Streamflow Reconstruction with Mass Balance Adjustment

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