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Chemical weathering since the Little Ice Age recorded in lake sediments: a high‐resolution proxy of past climate
Author(s) -
Jin Zhangdong,
Wang Sumin,
Shen Ji,
Zhang Enlou,
Li Fuchun,
Ji Junfeng,
Lu Xinwei
Publication year - 2001
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/esp.224
Subject(s) - weathering , geology , watershed , proxy (statistics) , soil production function , paleoclimatology , strontium , climate change , precipitation , geochemistry , hydrology (agriculture) , earth science , sediment , physical geography , geomorphology , oceanography , soil science , soil water , chemistry , meteorology , computer science , geography , physics , geotechnical engineering , organic chemistry , pedogenesis , machine learning
Because of the different geochemical behaviour of rubidium and strontium in earth surface processes, variations of the Rb/Sr ratios in lake sediments were used as a geochemical proxy of chemical weathering and past climate in a single watershed. Low magnetic susceptibility, low CaCO 3 , low Sr concentration and, hence, high Rb/Sr ratio in the lake sediments indicate weak chemical weathering under a cold but wet climate during the Little Ice Age (LIA) in the closed Daihai Lake watershed. The concordant change in both Sr and CaCO 3 concentrations with δ 18 O values in the Dunde ice core suggests that weak chemical weathering during the wet LIA was controlled by air temperature. After the LIA, however, precipitation played a dominant role in chemical weathering. Copyright © 2001 John Wiley & Sons, Ltd.