کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9524398 1348969 2005 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A Middle Wisconsin interstadial in the northern Andes
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
A Middle Wisconsin interstadial in the northern Andes
چکیده انگلیسی
This article reports the occurrence of a Middle Wisconsin interstadial, Pedregal, in the northern Venezuelan Andes, as demonstrated by high-resolution pollen analysis of a previously dated peat layer. Paleoclimatic trends are deduced mainly from changes in the abundance of tree pollen from the uppermost Andean forests. Previous calibration of this pollen with modern analogs has enabled reconstructions of prior altitudinal displacements of montane ecological belts and temperature changes. Paleotemperatures were deduced from the current lapse rate (−0.6 °C/100 m). After a glacier advance, represented by an underlying till, average temperatures increased to 3 °C lower than modern temperatures during the Pedregal interstadial and then dropped again to approximately 7 °C lower than modern. It is the oldest Quaternary paleoclimatic event reported thus far in the area.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of South American Earth Sciences - Volume 19, Issue 2, June 2005, Pages 173-179
نویسندگان
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