|Table of Contents|

Time-frequency Analysis on Palaeoclimate Recorded by Phytolith at the Late Holocene Peat Deposits in Dunhua Basin(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2010年第04期
Page:
420-429
Research Field:
水资源与环境
Publishing date:

Info

Title:
Time-frequency Analysis on Palaeoclimate Recorded by Phytolith at the Late Holocene Peat Deposits in Dunhua Basin
Author(s):
ZHANG Xin-rong1; 2;  FANG Shi1; 2;  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)
Keywords:
phytolith;  peat deposit;  Morlet;  wavelet transform;  palaeoclimate;  Holocene;  Dunhua Basin
PACS:
P532
DOI:
-
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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Last Update: 2010-12-20