Blue intensity for dendroclimatology: Should we have the blues? Experiments from Scotland

Rydval, Miloš; Larsson, Lars-Åke; McGlynn, Laura; Gunnarson, Björn E.; Loader, Neil J.; Young, Giles H.F.; Wilson, Rob

doi:10.1016/j.dendro.2014.04.003

Cited by 117 publications

(186 citation statements)

References 26 publications

Supporting

Mentioning

174

Contrasting

Unclassified

Order By: Relevance

“…(Wilson and Luckman, 2003), signal strength in LWB and DB in GOA hemlock is weaker than RW; thus, replication needs to be substantially increased (ideally > 20 trees, Table 1) to allow the development of robust chronologies. Rydval et al (2014) also showed that a substantial improvement in LWB signal strength could be gained by measuring two or even three radii per tree. Additional assessments of signal strength should be conducted as new species and sites are analysed using BI methods.…”

Section: Discussionmentioning

confidence: 96%

“…DB values were calculated within CooRecorder by subtracting the raw LWB values from the raw EWB values for each year. Since raw LWB is negatively correlated with MXD (high-density dark latewood means low reflectance), values were inverted following the method detailed in Rydval et al (2014) to allow for LWB (hereafter denoted as LWB inv ) to be detrended in a similar way to MXD (see also . The nature of the DB calculation results in this pa-rameter being positively correlated with LWB inv means that these data could also theoretically be detrended in a similar way.…”

Section: Methods and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…For example, some conifer species (including Scots pine and mountain hemlock) show a clear sharp or transitional colour change from the heartwood to sapwood, which, even after resin extraction using ethanol or acetone, can still impose a systematic change in reflectance around the heartwood/sapwood transition Björklund et al, 2014Björklund et al, , 2015. Further colour variations, often seen in dead but preserved snag or subfossil wood, can also result in systematic biases when combined with data measured from living samples (Björk-lund et al, 2014(Björk-lund et al, , 2015Rydval et al, 2014). Björklund et al (2014) proposed a potential solution to the heartwoodsapwood colour bias issue by effectively detrending the LWB measurements by removing the inherent common colour changes of the early wood and latewood (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Minimum latewood blue intensity (LWB) has recently been shown to have strong similarities to MXD and is much cheaper and simpler to generate (McCarroll et al, 2002;Björklund et al, 2014Björklund et al, , 2015Rydval et al, 2014;Wilson et al, 2014Wilson et al, , 2017. LWB is closely related to MXD as they both measure similar wood properties (combined hemicellulose, cellulose, and lignin content related to cell wall thickness), and both are well correlated with warm-season temperatures (Campbell et al, 2007;Björklund et al, 2014;Rydval et al, 2014;Wilson et al, 2014). This correspondence between BI and temperature has recently been shown to hold true for several locations and tree species, including Scots pine (Pinus sylvestris) in Scotland, UK , and Sweden (Björklund et al, 2014(Björklund et al, , 2015; Caucasian fir (Abies nordmanniana) in the Northern Caucasus (Dolgova, 2016); Stone pine (Pinus cembra) in Austria ; Engelmann spruce (Picea engelmannii) from the Canadian Rockies, British Columbia, Canada .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Experiments based on blue intensity for reconstructing North Pacific temperatures along the Gulf of Alaska

et al. 2017

Self Cite

View full text Add to dashboard Cite

Abstract. Ring-width (RW) records from the Gulf of Alaska (GOA) have yielded a valuable long-term perspective for North Pacific changes on decadal to longer timescales in prior studies but contain a broad winter to late summer seasonal climate response. Similar to the highly climatesensitive maximum latewood density (MXD) proxy, the blue intensity (BI) parameter has recently been shown to correlate well with year-to-year warm-season temperatures for a number of sites at northern latitudes. Since BI records are much less labour intensive and expensive to generate than MXD, such data hold great potential value for future treering studies in the GOA and other regions in mid-to high latitudes. Here we explore the potential for improving treering-based reconstructions using combinations of RW-and BI-related parameters (latewood BI and delta BI) from an experimental subset of samples at eight mountain hemlock (Tsuga mertensiana) sites along the GOA. This is the first study for the hemlock genus using BI data. We find that using either inverted latewood BI (LWB inv ) or delta BI (DB) can improve the amount of explained temperature variance by > 10 % compared to RW alone, although the optimal target season shrinks to June-September, which may have implications for studying ocean-atmosphere variability in the region. One challenge in building these BI records is that resin extraction did not remove colour differences between the heartwood and sapwood; thus, long term trend biases, expressed as relatively warm temperatures in the 18th century, were noted when using the LWB inv data. Using DB appeared to overcome these trend biases, resulting in a reconstruction expressing 18th-19th century temperatures ca. 0.5 • C cooler than the 20th-21st centuries. This cool period agrees well with previous dendroclimatic studies and the glacial advance record in the region. Continuing BI measurement in the GOA region must focus on sampling and measuring more trees per site (> 20) and compiling more sites to overcome site-specific factors affecting climate response and using subfossil material to extend the record. Although LWB inv captures the interannual climate signal more strongly than DB, DB appears to better capture long-term secular trends that agree with other proxy archives in the region. Great care is needed, however, when implementing different detrending options and more experimentation is necessary to assess the utility of DB for different conifer species around the Northern Hemisphere.

show abstract

Section: Discussionmentioning

confidence: 96%

Section: Methods and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Experiments based on blue intensity for reconstructing North Pacific temperatures along the Gulf of Alaska

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

Seasonal climate signals from multiple tree ring metrics: A case study of Pinus ponderosa in the upper Columbia River Basin

Dannenberg

Wise

2016

JGR Biogeosciences

View full text Add to dashboard Cite

Projected changes in the seasonality of hydroclimatic regimes are likely to have important implications for water resources and terrestrial ecosystems in the U.S. Pacific Northwest. The tree ring record, which has frequently been used to position recent changes in a longer-term context, typically relies on signals embedded in the total ring width of tree rings. Additional climatic inferences at a subannual temporal scale can be made using alternative tree ring metrics such as earlywood and latewood widths and the density of tree ring latewood. Here we examine seasonal precipitation and temperature signals embedded in total ring width, earlywood width, adjusted latewood width, and blue intensity chronologies from a network of six Pinus ponderosa sites in and surrounding the upper Columbia River Basin of the U.S. Pacific Northwest. We also evaluate the potential for combining multiple tree ring metrics together in reconstructions of past cool-and warm-season precipitation. The common signal among all metrics and sites is related to warm-season precipitation. Earlywood and latewood widths differ primarily in their sensitivity to conditions in the year prior to growth. Total and earlywood widths from the lowest elevation sites also reflect cool-season moisture. Effective correlation analyses and composite-plus-scale tests suggest that combining multiple tree ring metrics together may improve reconstructions of warm-season precipitation. For cool-season precipitation, total ring width alone explains more variance than any other individual metric or combination of metrics. The composite-plus-scale tests show that variance-scaled precipitation reconstructions in the upper Columbia River Basin may be asymmetric in their ability to capture extreme events.

show abstract

Dendrochronology and Archaeology

Manning¹

2023

Handbook of Archaeological Sciences

View full text Add to dashboard Cite

Blue intensity for dendroclimatology: Should we have the blues? Experiments from Scotland

Cited by 117 publications

References 26 publications

Experiments based on blue intensity for reconstructing North Pacific temperatures along the Gulf of Alaska

Experiments based on blue intensity for reconstructing North Pacific temperatures along the Gulf of Alaska

Seasonal climate signals from multiple tree ring metrics: A case study of Pinus ponderosa in the upper Columbia River Basin

Dendrochronology and Archaeology

Contact Info

Product

Resources

About