Tree-ring reconstructions of circulation indices
نویسندگان
چکیده
منابع مشابه
Temperature reconstructions from tree-ring densities overestimate volcanic cooling
The fidelity of inferences on volcanic cooling from tree-ring density records has recently come into question, with competing claims that temperature reconstructions based on tree-ring records underestimate cooling due to an increased likelihood of missing rings or overestimate cooling due to reduced light availability accentuating the response. Here we test these competing hypotheses in the la...
متن کاملUnderestimation of volcanic cooling in tree-ring-based reconstructions of hemispheric temperatures
The largest eruption of a tropical volcano during the past millennium occurred in AD 1258–1259. Its estimated radiative forcing was several times larger than the 1991 Pinatubo eruption1. Radiative forcing of that magnitude is expected to result in a climate cooling of about 2 C (refs 2–5). This effect, however, is largely absent from tree-ring reconstructions of temperature6–8, and is muted in ...
متن کاملReconstructions of Soil Moisture for the Upper Colorado River Basin Using Tree-ring Chronologies
Soil moisture is an important factor in the global hydrologic cycle, but existing reconstructions of historic soil moisture are limited. We used tree-ring chronologies to reconstruct annual soil moisture in the Upper Colorado River Basin (UCRB). Gridded soil moisture data were spatially regionalized using principal components analysis and k-nearest neighbor techniques. We correlated moisture se...
متن کاملBivariate Drought Analysis Using Streamflow Reconstruction with Tree Ring Indices in the Sacramento Basin, California, USA
Long-term streamflow data are vital for analysis of hydrological droughts. Using an artificial neural network (ANN) model and nine tree-ring indices, this study reconstructed the annual streamflow of the Sacramento River for the period from 1560 to 1871. Using the reconstructed streamflow data, the copula method was used for bivariate drought analysis, deriving a hydrological drought return per...
متن کاملVariations in Environmental Signals in Tree-Ring Indices in Trees with Different Growth Potential.
We analysed two groups of Quercus robur trees, growing at nearby plots with different micro-location condition (W-wet and D-dry) in the floodplain Krakovo forest, Slovenia. In the study we compared the growth response of two different tree groups to environmental variables, the potential signal stored in earlywood (EW) structure and the potential difference of the information stored in carbon i...
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ژورنال
عنوان ژورنال: Climate Research
سال: 1997
ISSN: 0936-577X,1616-1572
DOI: 10.3354/cr008117