|本期目录/Table of Contents|

[1]张新荣,方石,胡克,等.敦化盆地晚全新世泥炭沉积中植硅体古气候记录的时频分析[J].地球科学与环境学报,2010,32(04):420-429.
 ZHANG Xin-rong,FANG Shi,HU Ke,et al.Time-frequency Analysis on Palaeoclimate Recorded by Phytolith at the Late Holocene Peat Deposits in Dunhua Basin[J].Journal of Earth Sciences and Environment,2010,32(04):420-429.
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敦化盆地晚全新世泥炭沉积中植硅体古气候记录的时频分析(PDF)
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第32卷
期数:
2010年第04期
页码:
420-429
栏目:
水资源与环境
出版日期:
2010-12-20

文章信息/Info

Title:
Time-frequency Analysis on Palaeoclimate Recorded by Phytolith at the Late Holocene Peat Deposits in Dunhua Basin
文章编号:
1672-6561(2010)04-0420-10
作者:
张新荣12方石12胡克3王东坡1
(1. 吉林大学 地球科学学院,吉林 长春 130061; 2. 吉林大学 东北亚生物演化与环境教育部重点实验室, 吉林 长春 130026; 3. 中国地质大学 海洋学院,北京 100083)
Author(s):
ZHANG Xin-rong12 FANG Shi12 HU Ke3 WANG Dong-po1
(1. School of Earth Sciences, Jilin University, Changchun 130061, Jilin, China; 2. Key Laboratory for Evolution of PastLife and Environment in Northeast Asia of Ministry of Education, Jilin University, Changchun 130026, Jilin, China; 3.School of Ocean Sciences, China University of Geosciences, Beijing 100083, China)
关键词:
植硅体泥炭沉积Morlet小波变换古气候全新世敦化盆地
Keywords:
phytolith peat deposit Morlet wavelet transform palaeoclimate Holocene Dunhua Basin
分类号:
P532
DOI:
-
文献标志码:
A
摘要:
沉积地层中古气候参数的多层次性以及解释过程中的人为性使古气候重建结果带有一定的误差。采用Morlet一维连续小波变换对敦化盆地吉祥和榆树剖面中植硅体记录的古气候参数进行时频分析,探讨植硅体反演的古气候变化过程。结果表明,吉祥剖面在频率域尺度a≥30时的小波变换系数波谱及能量变化与榆树剖面在a≥20时存在相似性,且均具有6个不同能量聚集区域,因此把敦化盆地晚全新世以来的古气候变迁分为6个阶段:公元前730年以前为温暖降温期;公元前730—公元前205年为温和湿润并逐渐变凉时期;公元前205—公元255年为温暖时期;公元255—525年为降温变冷时期;公元525—1220年为温暖湿润时期;公元1220年以来进入气候波动比较频繁时期。Morlet一维连续小波变换可以有效处理古气候信息的叠加,减小人为性分析带来的误差,在古气候分析中具有很大应用潜力。
Abstract:
Diversity of palaeoclimate parameters in sedimentary stratigraphy and its artificiality in interpretation process bring some inevitable errors. Based on Morlet one-dimensional continue wavelet transform, palaeoclimate parameters recorded by phytolith at Jixiang and Yushu profiles in Dunhua Basin were analyzed by time-frequency, change of palaeo-climat was discussed. The results showed that the wavelet spectrum and energy change at Jixiang profile with no less than 30 frequency scales were similar with that at Yushu profile with no less than 20 frequency scales, and both profiles had six different energy aggregation regions. Changes of palaeoclimate since the Late Holocene in Dunhua Basin was divided into six stages: before BC 730, warm and cooling period; BC 730-BC 205, mild, humid, and gradually cooling period; BC 205-AD 255, warm period; AD 255-525, cooling period; AD 525-1220, warm and humid period; after AD 1220, a stage with more frequent fluctuations. Morlet one-dimensional continue wavelet transform could deal with the superposition of palaeoclimate records effectively and reduce the artificial error, enjoy huge potential for application in palaeoclimate research.

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备注/Memo

备注/Memo:
收稿日期:2010-01-07
基金项目: 国家自然科学基金项目(40702027; 40830107; 40902057)
作者简介: 张新荣(1975-),女,河北景县人,副教授,理学博士,从事沉积学及第四纪地质学研究。E-mail:zhangxr@jlu.edu.cn
更新日期/Last Update: 2010-12-20