Abstract
Major problems of dating of the glaciers activity from the wood residues found in moraines are discussed by the example of Maly Aktru Glacier. First of all, these are the underestimation of the glacier development features, the age of the sample itself and its content as well as losses of some outer rings. The study proves that disagreements between dendrochronological and radiocarbon ages of the samples are caused by manifestation of the Suess effect and contents of the wood cells. The reconstruction of June–July temperatures in the Aktru valley for two thousand years was used to reconstruct the altitudinal variability of the tree line thermal potential. Existence of a climatic optimum (I–IV A.D.) had been revealed that brought to the higher position of the tree line in mid ages than its thermal potential could enable. On the basis of variability of growth indices for Siberian larch, it is shown that the medieval optimum stands out against a background of solely strong temperature depressions separating it from ancient and modern times, and the climate’s natural history is evidence that the current climate warming is an ordinary phenomenon.
Highlights
Изменения климата и активности ледников Алтая, в долине р
of the glaciers activity from the wood residues found in moraines are discussed by the example
these are the underestimation of the glacier development features
Summary
First of all, these are the underestimation of the glacier development features, the age of the sample itself and its content as well as losses of some outer rings. Ключевые слова: верхняя граница леса, дендрохронология, история климата, ледники Алтая, радиоуглерод. Рассматриваются проблемы датирования активности ледников по древесным остаткам, находящимся в морене, на примере ледника Малый Актру. Изменения климата и активности ледников Алтая, в долине р. Все перечисленные проблемы в полной мере касаются ледников Алтая, среди которых ледни ки Актру – наиболее изученные. Решение первой задачи – определение актив ности ледника Малый Актру – невозможно без рассмотрения противоречия между радиоугле родными и дендрохронологическими датами, на которое указывал ещё П.А. По скольку существование леса на верхнем пределе, как и существование ледников, во многом опреде ляется летней температурой, обе задачи решались совместно, информативно дополняя друг друга
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
