High-resolution paleoclimatic information from Chinese eolian sediments based on grayscale intensity profiles

被引：51

作者：

Porter, SC ^{[1
]}

机构：

[1] Univ Washington, Dept Geol Sci, Seattle, WA 98195 USA

[2] Univ Washington, Quaternary Res Ctr, Seattle, WA 98195 USA

来源：

QUATERNARY RESEARCH | 2000年 / 53卷 / 01期

基金：

美国国家科学基金会;

关键词：

China; loess; paleosols; Loess Plateau; grayscale intensity; magnetic susceptibility; bioturbation;

D O I：

10.1006/qres.1999.2092

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

摘要：

Grayscale intensity profiles from photographic images offer a rapid means of obtaining paleoclimate proxy records from Chinese loess, dune sand, and paleosols. Although the data can be obtained using conventional 35-mm film images, a digital camera and laptop computer will produce a high-resolution grayscale profile at a field site within minutes. Comparison of grayscale profiles with profiles of magnetic susceptibility measured down loess and dunesand sections at sites on the Loess Plateau and Tibetan Plateau in a range of altitudes and climatic regimes shows that the two parameters are highly correlated. Therefore, grayscale intensity is a convenient alternative to magnetic susceptibility for generating paleoclimatic data in the loess and desert-margin regions of China. The resolution of both grayscale and susceptibility profiles ultimately is limited by bioturbation, which is most pronounced in paleosols. (C) 2000 University of Washington.

引用

页码：70 / 77

页数：8

共 18 条

[1]

An Z., 1990, QUATERN INT, V7, P91, DOI DOI 10.1016/1040-6182(90)90042-3

[2] MAGNETIC-SUSCEPTIBILITY EVIDENCE OF MONSOON VARIATION ON THE LOESS PLATEAU OF CENTRAL CHINA DURING THE LAST 130,000 YEARS [J].