نتایج جستجو برای: tree rings
تعداد نتایج: 217757 فیلتر نتایج به سال:
abstract 1 most tree characteristics such as annual growth ring are influenced by climatic changes. dendroclimatology, a branch of dendrochronology science, studies the effects of climate parameters such as temperature and precipitation on the characteristics of annual growth ring. to carry out this research, 30 quercus persica coppice trees were selected in oak forest in khorramabad, l...
in this study, we aimed to reconstruct the mean, maximum mean and âminimum mean temperature from the chronology of tree rings width of two âquercus persica sites in dena region, where efficient climatic data have a âshort period (1982-2011). the duration of common chronology of the sites âis 131 years (1881-2011).considering the strong correlation between âclimatic data and growth rin...
The long-range correlations associated with the presence of persistence are investigated by applying detrended fluctuation analysis (DFA) on three different proxies long-term solar activity. considered datasets a sunspot number reconstruction (SNR04) obtained from atmospheric activity cosmogenic isotope 14C derived tree rings, total irradiance (TSIR12) several 10Be ice core records Greenland an...
Tree rings are natural archives of climate and environmental information with a yearly resolution. Indeed, wood anatomical, chemical, and other properties of tree rings are a synthesis of several intrinsic and external factors, and their interaction during tree growth. In particular, Intra-Annual Density Fluctuations (IADFs) can be considered as tree-ring anomalies that can be used to better un...
Abstract This chapter aims at summarizing strengths and caveats on the suitability of stable carbon oxygen isotopes in tree rings as recorders for fingerprints environmental influences. First, constraints limiting growth shaping species distribution worldwide are discussed. Second, examples presented conditions under which tree-ring record signals particularly well, but also cases where physiol...
We introduce a method of searching the k nearest neighbours (k-NN) using PM-tree. The PM-tree is a metric access method for similarity search in large multimedia databases. As an extension of M-tree, the structure of PM-tree exploits local dynamic pivots (like M-tree does it) as well as global static pivots (used by LAESA-like methods). While in M-tree a metric region is represented by a hyper-...
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