41160
2016
2019
eng
15
543
postprint
1
2019-01-21
2019-01-21
--
Molecular paleoclimate reconstructions over the last 9 ka from a peat sequence in South China
To achieve a better understanding of Holocene climate change in the monsoon regions of China, we investigated the molecular distributions and carbon and hydrogen isotope compositions delta C-13 and delta D values) of long-chain n-alkanes in a peat core from the Shiwangutian SWGT) peatland, south China over the last 9 ka. By comparisons with other climate records, we found that the delta C-13 values of the long-chain n-alkanes can be a proxy for humidity, while the dD values of the long-chain n-alkanes primarily recorded the moisture source dD signal during 9-1.8 ka BP and responded to the dry climate during 1.8-0.3 ka BP. Together with the average chain length ACL) and the carbon preference index CPI) data, the climate evolution over last 9 ka in the SWGT peatland can be divided into three stages. During the first stage 9-5 ka BP), the delta C-13 values were depleted and CPI and Paq values were low, while ACL values were high. They reveal a period of warm and wet climate, which is regarded as the Holocene optimum. The second stage 5-1.8 ka BP) witnessed a shift to relatively cool and dry climate, as indicated by the more positive delta C-13 values and lower ACL values. During the third stage 1.8-0.3 ka BP), the delta C-13, delta D, CPI and Paq values showed marked increase and ACL values varied greatly, implying an abrupt change to cold and dry conditions. This climate pattern corresponds to the broad decline in Asian monsoon intensity through the latter part of the Holocene. Our results do not support a later Holocene optimum in south China as suggested by previous studies.
Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
10.25932/publishup-41160
urn:nbn:de:kobv:517-opus4-411608
1866-8372
online registration
e0160934
PLOS ONE 11 (2016) 8, Art. e0160934 DOI 10.1371/journal.pone.0160934
false
true
CC-BY - Namensnennung 4.0 International
Xinxin Wang
Xianyu Huang
Dirk Sachse
Weihua Ding
Jiantao Xue
Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
543
eng
uncontrolled
n-alkaline distributions
eng
uncontrolled
East-Asian monsoon
eng
uncontrolled
lacustrine sedimentary sequence
eng
uncontrolled
intertropical convergence zone
eng
uncontrolled
Western Nanling mountains
eng
uncontrolled
North-Atlantic climate
eng
uncontrolled
delta-D values
eng
uncontrolled
summer monsoon
eng
uncontrolled
isotopic composition
eng
uncontrolled
hydrogen isotopes
Naturwissenschaften und Mathematik
Medizin und Gesundheit
open_access
Mathematisch-Naturwissenschaftliche Fakultät
Referiert
Open Access
Public Library of Science (PLOS)
Universität Potsdam
https://publishup.uni-potsdam.de/files/41160/pmnr543.pdf
45060
2016
2016
eng
15
11
article
PLoS
San Fransisco
1
--
--
--
Molecular Paleoclimate Reconstructions over the Last 9 ka from a Peat Sequence in South China
To achieve a better understanding of Holocene climate change in the monsoon regions of China, we investigated the molecular distributions and carbon and hydrogen isotope compositions delta C-13 and delta D values) of long-chain n-alkanes in a peat core from the Shiwangutian SWGT) peatland, south China over the last 9 ka. By comparisons with other climate records, we found that the delta C-13 values of the long-chain n-alkanes can be a proxy for humidity, while the dD values of the long-chain n-alkanes primarily recorded the moisture source dD signal during 9-1.8 ka BP and responded to the dry climate during 1.8-0.3 ka BP. Together with the average chain length ACL) and the carbon preference index CPI) data, the climate evolution over last 9 ka in the SWGT peatland can be divided into three stages. During the first stage 9-5 ka BP), the delta C-13 values were depleted and CPI and Paq values were low, while ACL values were high. They reveal a period of warm and wet climate, which is regarded as the Holocene optimum. The second stage 5-1.8 ka BP) witnessed a shift to relatively cool and dry climate, as indicated by the more positive delta C-13 values and lower ACL values. During the third stage 1.8-0.3 ka BP), the delta C-13, delta D, CPI and Paq values showed marked increase and ACL values varied greatly, implying an abrupt change to cold and dry conditions. This climate pattern corresponds to the broad decline in Asian monsoon intensity through the latter part of the Holocene. Our results do not support a later Holocene optimum in south China as suggested by previous studies.
PLoS one
10.1371/journal.pone.0160934
27505008
1932-6203
wos2016:2019
e0160934
WOS:000381374200081
Huang, XY (reprint author), China Univ Geosci, Sch Earth Sci, Lab Crit Zone Evolut, Wuhan, Peoples R China.; Huang, XY (reprint author), China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan, Peoples R China., xianyu.huang@gmail.com
NSFC [41472308, 41330103]; 111 Project [B08030]; fundamental research funds for the central universities [CUG150618]
importub
2020-03-22T15:22:01+00:00
filename=package.tar
85ff9d94d307504b9d3af96cdd844d0a
Xinxin Wang
Xianyu Huang
Dirk Sachse
Weihua Ding
Jiantao Xue
Institut für Geowissenschaften
Referiert
Institut für Erd- und Umweltwissenschaften
Import
45098
2016
2016
eng
375
385
13
75
article
Springer
New York
1
--
--
--
Comparisons of lipid molecular and carbon isotopic compositions in two particle-size fractions from surface peat and their implications for lipid preservation
Knowledge of the possible impacts of early diagenesis on lipid biomarkers in geologic settings is important for robust applications of lipid proxies for paleoclimate reconstructions. In this study, molecular distributions and carbon isotopic compositions of lipids were compared in two particle-size fractions (<0.3 mm and >0.3 mm) of twelve surface peat samples collected from Dajiuhu peatland, central China. The average chain length (ACL) values of long-chain n-alkanes, n-fatty alcohols, n-fatty acids and n-alkan-2-ones show no significant differences between the finer and coarser fractions. In contrast, the carbon preference index values of long-chain n-alkanes, n-fatty alcohols and n-alkan-2-ones have relatively smaller values in the finer fractions than in the coarser ones. Stanols were also more abundant in the finer fractions. In addition, the delta C-13 values of odd-numbered n-alkanes (C-23-C-33) were generally less negative in the finer fractions. Our results indicate that (1) the finer fractions probably experienced stronger degradation than the coarser fractions; (2) the less negative delta(CC)-C-13 values of odd-numbered n-alkanes (C-23-C-33) in the finer fractions were largely a result of greater heterotrophic reworking during degradation; (3) ACL values of long-chain n-alkyl lipids (n-alkanes, n-fatty alcohols and n-fatty acids, n-alkan-2-ones) appear to be reliable proxies to trace lipid sources and their associated paleoenvironmental signals in peat deposits.
Environmental earth sciences
10.1007/s12665-016-5960-3
1866-6280
1866-6299
wos2016:2019
1142
WOS:000381077100025
Huang, XY (reprint author), China Univ Geosci, Sch Earth Sci, Lab Crit Zone Evolut, Wuhan 430074, Peoples R China.; Huang, XY (reprint author), China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China., xianyu.huang@gmail.com
National Natural Science Foundation of China [41472308, 41330103]; Programme of Introducing Talents of Discipline to Universities [B08030]; Fundamental Research Funds for the Central Universities [CUG150618]
importub
2020-03-22T15:41:02+00:00
filename=package.tar
a17f85a3e38813da7ee61be7125fe82b
Xinxin Wang
Xianyu Huang
Dirk Sachse
Yu Hu
Jiantao Xue
Philip A. Meyers
eng
uncontrolled
Peat
eng
uncontrolled
Lipids
eng
uncontrolled
Compound-specific carbon isotope
eng
uncontrolled
Particle-size fractions
eng
uncontrolled
Decomposition
Institut für Geowissenschaften
Referiert
Institut für Erd- und Umweltwissenschaften
Import