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Blue intensity improves Fennoscandian drought records
Delta blue intensity from Swedish drought-sensitive pines explains ~56% of May–July precipitation versus ~37% for ring width.
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Which BI parameter has the strongest common signal?
MXBI, median Rbar 0.43, just ahead of ΔBI at 0.42.
Source: Using Blue Intensity from drought-sensitive <i>Pinus sylvestris</i> in Fennoscandia to improve reconstruction of past hydroclimate variability · DOI · quote verified
How weak is the EWBI common signal?
Median Rbar 0.18, the weakest of the set.
Source: Using Blue Intensity from drought-sensitive <i>Pinus sylvestris</i> in Fennoscandia to improve reconstruction of past hydroclimate variability · DOI · quote verified
How well does ΔBI track May–July precipitation?
PC1 correlation r = 0.75, the strongest rain signal.
Source: Using Blue Intensity from drought-sensitive <i>Pinus sylvestris</i> in Fennoscandia to improve reconstruction of past hydroclimate variability · DOI · quote verified
What climate does EWBI record?
Positive February–May temperature (r = 0.48) and negative May precipitation.
Source: Using Blue Intensity from drought-sensitive <i>Pinus sylvestris</i> in Fennoscandia to improve reconstruction of past hydroclimate variability · DOI · quote verified
How much May–July rain variance does full-period ΔBI explain?
56% over 1901–2010.
Source: Using Blue Intensity from drought-sensitive <i>Pinus sylvestris</i> in Fennoscandia to improve reconstruction of past hydroclimate variability · DOI · quote verified
How much worse is ring width than ΔBI on the same MJJ target?
37% vs 56%, nearly 20 percentage points less.
Source: Using Blue Intensity from drought-sensitive <i>Pinus sylvestris</i> in Fennoscandia to improve reconstruction of past hydroclimate variability · DOI · quote verified
What is the site network?
Five Pinus sylvestris sites, ~500 km from 57° to 62°N in Sweden.
Source: Using Blue Intensity from drought-sensitive <i>Pinus sylvestris</i> in Fennoscandia to improve reconstruction of past hydroclimate variability · DOI · quote verified
Over what common period is the PCA run?
1798–2010.
Source: Using Blue Intensity from drought-sensitive <i>Pinus sylvestris</i> in Fennoscandia to improve reconstruction of past hydroclimate variability · DOI · quote verified
Why choose ΔBI for precipitation reconstruction?
Strongest, broadest, and most time-stable summer rain response.
Source: Using Blue Intensity from drought-sensitive <i>Pinus sylvestris</i> in Fennoscandia to improve reconstruction of past hydroclimate variability · DOI · quote verified
What non-climate BI artifact do they flag?
Heartwood/sapwood color steps, steep around 1900 then flattening near 1960.
Source: Using Blue Intensity from drought-sensitive <i>Pinus sylvestris</i> in Fennoscandia to improve reconstruction of past hydroclimate variability · DOI · quote verified
How much network variance do the first two PCs explain?
36.6% and 13.2%.
Source: Using Blue Intensity from drought-sensitive <i>Pinus sylvestris</i> in Fennoscandia to improve reconstruction of past hydroclimate variability · DOI · quote verified