Results 1 to 10 of about 623,719 (338)
Radiocarbon and wood anatomy as complementary tools for generating tree-ring records in Bolivia [PDF]
Frontiers in Plant Science, 2023 The science of tropical dendrochronology is now emerging in regions where tree-ring dating had previously not been considered possible. Here, we combine wood anatomical microsectioning techniques and radiocarbon analysis to produce the first tree-ring ...
Arturo Pacheco-Solana +13 more
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Experiments based on blue intensity for reconstructing North Pacific temperatures along the Gulf of Alaska [PDF]
Climate of the Past, 2017 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.
R. Wilson +10 more
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Geophysical Research Letters, 2021 Warming in Central Asia has been accelerating over the past three decades and is expected to intensify through the end of this century. Here, we develop a summer temperature reconstruction for western Mongolia spanning eight centuries (1269–2004 C.E ...
N. K. Davi +10 more
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Ecological and societal effects of Central Asian streamflow variation over the past eight centuries
npj Climate and Atmospheric Science, 2022 Understanding changes in water availability is critical for Central Asia; however, long streamflow reconstructions extending beyond the period of instrumental gauge measurements are largely missing.
Feng Chen +11 more
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Radial Growth of Qilian Juniper on the Northeast Tibetan Plateau and Potential Climate Associations [PDF]
, 2013 There is controversy regarding the limiting climatic factor for tree radial growth at the alpine treeline on the northeastern Tibetan Plateau. In this study, we collected 594 increment cores from 331 trees, grouped within four altitude belts spanning the
A Dai +46 more
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Frontiers in Environmental Science, 2022 The extreme precipitation threshold is fundamental to extreme precipitation research, directly affecting the cognition of extreme characteristics. Based on the daily precipitation data of 62 meteorological stations from 1985 to 2005, this study uses ...
Jing Chen +15 more
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Atmosphere, 2023 Eastern Xinjiang, as a typical extremely arid area, exhibits a high sensitivity to climate change. Gaining a comprehensive understanding of the climatic changes in this region, along with their driving mechanisms, and comparing these with the broader ...
Lu Li +6 more
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A 422-Year Reconstruction of the Kaiken River Streamflow, Xinjiang, Northwest China
Atmosphere, 2020 Our understanding of Central Asian historical streamflow variability is still limited because of short instrumental hydrologcial records. Based on tree-ring cores collected from three sampling sites in Kaiken River basin near Tien Shan, a regional tree ...
Heli Zhang +5 more
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Trees and valuation rings [PDF]
Transactions of the American Mathematical Society, 2000 Let \(D\) be a division algebra, finite dimensional over its centre \(F\). The set \(B\) of valuation rings (not necessarily invariant) in \(D\), regarded as a graph, forms a rooted tree (with the maximal element \(D\) as root). The authors ask whether every finite rooted tree can be realized in this way.
Brungs, Hans, Gräter, Joachim
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Branch rings, thinned rings, tree enveloping rings [PDF]
Israel Journal of Mathematics, 2006 We develop the theory of ``branch algebras'', which are infinite-dimensional associative algebras that are isomorphic, up to taking subrings of finite codimension, to a matrix ring over themselves. The main examples come from groups acting on trees. In particular, for every field k we construct a k-algebra K which (1) is finitely generated and infinite-
openaire +4 more sources