作者
BS Kotlia, LM Joshi
发表日期
2013/4/10
期刊
Current Science
页码范围
911-919
出版商
Current Science Association
简介
Geochemical study of a 3.55 m long lake sediment core from the Badanital Lake (Garhwal Himalaya) reveals Late Holocene centennial-scale climatic changes. The ecosystem of the tectonically formed lake seems to be controlled by natural and anthropogenic factors. The imprints of four major global events, e.g. 4.2 ka event, Medieval Warm Period (MWP), Little Ice Age (LIA) and modern warming are observed. By using the geochemical parameters, e.g. major oxides and their ratios (CaO/MgO, CaO/TiO2, MgO/TiO2, Na2O/TiO2, TiO2/Al2O3, Na2O/K2O and Fe2O3/TiO2), major elements, chemical index of weathering, chemical index of alteration and loss on ignition, the core profile is divided into six major climatic zones. The sediment accumulation rate was extremely slow during a cold/dry phase from ca. 5.1 to 3.5 ka BP. This was followed by wetter/moist phase from ca. 3.5 to 1.8 ka BP and the area further …
引用总数
201520162017201820192020202120222023202414551581066
学术搜索中的文章