Hydrology
Blue intensity improves Fennoscandian drought records
Open access · cc by · source: Europe PMC
Delta blue intensity from Swedish drought-sensitive pines explains ~56% of May–July precipitation versus ~37% for ring width.
Study at a glance
- Design
- Other — Tree-ring blue-intensity and width chronologies calibrated to CRU precipitation/temperature
- N
- N=5 · Five Pinus sylvestris sites along a ~500 km Swedish transect (57–62°N)
- Population
- Drought-sensitive Scots pine chronologies in Fennoscandia
- Outcome
- Delta blue intensity reconstructing May–July precipitation better than ring width
Structured fields used in claim comparison tables when every cited study has a complete layer.
Key findings
MXBI and ΔBI share the strongest common signal (median Rbar 0.43 and 0.42). ΔBI correlates 0.75 with May–July rain and reconstructs 56% of high-frequency precipitation variance, nearly 20 percentage points above full-interval ring width (37%). EWBI instead tracks February–May temperature (r=0.48).
Methodology
Authors measured MXBI, EWBI, ΔBI, and partial ring widths at five Pinus sylvestris sites along a ~500 km Swedish transect (57–62°N), then correlated PC1 chronologies with CRU climate and calibrated 1901–2010 reconstructions.
Limitations
Heartwood–sapwood color steps bias raw BI; they detrend high frequencies only, so centennial hydroclimate is not recovered. Five Swedish pine sites do not prove the method for other species or all of Fennoscandia.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
This library holds 8 empirical papers on hydrology with measured outcomes rather than reviews.
Evidence for the claim as stated.
Delta blue intensity from Swedish drought-sensitive pines explains ~56% of May–July precipitation versus ~37% for ring width.
Evidence for the claim as stated.
A Nile flood series or Prairie-Pothole runoff study is not a global water-cycle closure.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
A Nile flood series or Prairie-Pothole runoff study is not a global water-cycle closure.
Related papers in this topic
Same topic cluster — not a recommendation engine.