广西沿海全新世以来气候变化

CLIMATIC CHANGES SINCE HOLOCENE ALONG GUANGXI COAST

本文根据孢粉分析、有孔虫氧同位素分析、历史记载及现代气温观测资料，综合探讨广西沿海全新世以来的气候变化。经过研究，初步划分了本区全新世以来的７个气候期，在晚全新世内，进一步划分了７个气候亚期。早全新世、中全新世的气候变化具有１５００－２０００ａ周期，晚全新世早期的气候变化具有５００－１０００ａ周期，晚全新世中－晚期的气候变化具有２００ａ周期，２００ａ来的气候变化呈冷、热交替出现，具有１０－２０ａ或３０－５０ａ周期，现代气温呈现波动上升的趋势。

This paper studies synthetically dimatic changes since Holocene on the basis of thesporopollen, foraminifera, oxygen isotope analysis,historic records and data of modernair temperature. Climatic changes since Holocene have been grouped into 7 climaticstages. In Late Holocene, there were 7 climatic substages.Climatic changes of EarlyHolocene and Middle Holocene had a cycle of 1500-2000 years,the early time of LateHolocene had a cycle of 500-1000 years,and middle and late time of Late Holocene hada cycle of 200 years. Hot stages have alternated with cold ones with a cycle of 10-20years or 30-50 years since 200 years ago,And the modern temperature shows a tenden-cy to rise undulately.