Postglacial climate-change record in biomarker lipid compositions of the Hani peat sequence, Northeastern China

Weijian Zhou, Yanhong Zheng, Philip Meyers, A.J.Timothy Jull, Shucheng Xie

Research output: Contribution to journalArticle (Academic Journal)peer-review

104 Citations (Scopus)

Abstract

The peat sequence at Hani in northeastern China accumulated over the past 16 cal kyr in a percolation mire in which rain water and ground water seeped through the peat system. The molecular compositions of nalkanes,
n-alkanols, and n-alkanoic acids extracted from the Hani peat sequence reveal different responses to the progressive evolution of climate and changes in the nature of the peat-forming vegetation. Long chain
length components that originate from the waxy coatings of subaerial vascular plants dominate the n-alkane distributions throughout the Hani peat sequence. The paleoclimate integrity of these biomarker molecules appears to be well preserved. Most of the n-alkanol distributions are similarly dominated by long chain components that indicate their origins from subaerial plants. In contrast, n-alkanoic acid distributions are dominated by secondary components that record the importance of post-depositional microbial activity in this peat sequence, which evidently can be extensive in a percolation mire. Elevated n-alkane Paq values and C23/C29 ratios, which are both molecular proxies for water-loving plants, record an especially moist local climate in the Bølling-Allerød (14.5 to 12.9 ka), Younger Dryas (12.9 to 11.5 ka), and Pre-Boreal (11.5 to 10.5 ka) portions of the Hani peat sequence. Depressed Paq values and C23/C29 ratios and larger n-alkane average chain length values indicate that the Holocene Climatic Optimum (10.5 to 6 ka) was a period of warmer climate with lower effective precipitation, which contrasts with evidence of wetter climates
in most of East Asia.
Original languageEnglish
Pages (from-to)37-46
Number of pages10
JournalEarth and Planetary Science Letters
Volume294
Issue number1-2
DOIs
Publication statusPublished - 15 May 2010

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