Alkanes, compound-specific carbon isotope measures and climate variation during the last millennium from varved sediments of Lake Xiaolongwan, northeast China

Sun, Qing; Xie, Manman; Shi, Liming; Zhang, Zhuyue; Yuan, Lin; Shang, Wenyu; Wang, Kaijun; Li, Wei; Liu, Jiaqi; Chu, Guoqiang

doi:10.1007/s10933-013-9728-4

Cited by 52 publications

(28 citation statements)

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“…The compound‐specific δ 13 C 27–31 in the long‐chain n‐alkanes (Figure a) is sensitive to effective precipitation, and therefore represents a useful indicator for regional monsoonal precipitation [ Chu et al ., ; Sun et al ., ]. An increase in δ 13 C 27–31 indicates less effective precipitation.…”

Section: Resultsmentioning

confidence: 99%

“…d 13 C 27-31 fluctuates around 231.5 Figure 2. (a) Compound-specific d 13 C 27-31 in the long-chain n-alkanes from XLW [Sun et al, 2013]; (b) alkenone-based temperatures at Lake Sihailongwan which is 20 km to the east of XLW [Chu et al, 2012]; (c) mass-specific magnetic susceptibility (v lf ) measured on sediments from XLW; (d) frequency-dependent magnetic susceptibility (v fd , error bar corresponds to 3 measurements); (e) Mean grain size (Mz) measured on sediments from XLW [Chu et al, 2009]; (f) Chinese population development [Chen, 1997]; (g) accumulation rates of sediments from XLW (SAR); (h) varve thickness in the sediments from XLW; and (i) chronology of the upper part of sediment core X06 from XLW [Chu et al, 2009], maximum age calculated for XLW by Chu et al [2009] is used. The positions for representative samples used for rock magnetic measurements are marked with blue stars in figure 2c.…”

Section: Sedimentology Geochemistry and Physical Propertiesmentioning

confidence: 99%

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A 1400 year environmental magnetic record from varved sediments of Lake Xiaolongwan (Northeast China) reflecting natural and anthropogenic soil erosion

Chu

Liu

et al. 2015

Geochem Geophys Geosyst

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Lake sediments can provide high-quality information about human activities. In this study, we investigate a sediment core from Lake Xiaolongwan using magnetic and geochemical methods. The dominant magnetic minerals of this sediment core are stable single domain (SSD) and superparamagnetic (SP) magnetite particles. The increasing amount of SP particles reflected by the rise of magnetic susceptibility and frequency dependent magnetic susceptibility since AD 1500 can be attributed to an increasing influx in pedogenic soil, which is related to a regional-scale increase in the intensity of human activity in Northeastern China. This extends the timing of human activities, which is independent from climate changes and its effects on local ecosystems in Northeastern China significantly.

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Section: Resultsmentioning

confidence: 99%

Section: Sedimentology Geochemistry and Physical Propertiesmentioning

confidence: 99%

A 1400 year environmental magnetic record from varved sediments of Lake Xiaolongwan (Northeast China) reflecting natural and anthropogenic soil erosion

Chu

Liu

et al. 2015

Geochem Geophys Geosyst

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“…The second temperature chosen was 80 °C, suggested by Grice et al 31 The extraction process was repeated for the third time, with the temperature of 85 °C, used by Sun et al 57 to adapt the same methodology. Combining the three fractions, experiment F showed the best results with a considerable increase in the recovery of compounds.…”

Section: N-alkanes Isolation Experimentsmentioning

confidence: 99%

Compound-Specific δ13C of n-Alkanes: Clean-Up Methods Appraisal and Application to Recent Sediments of a Highly Contaminated Bay

Ceccopieri

Scofield

Almeida

et al. 2018

J. Braz. Chem. Soc.

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Different clean-up methods to determine isotopic composition of n-alkanes were tested. Sources of organic matter in Guanabara Bay were re-examined through the δ 13 C of individual n-alkanes in surface sediment samples. The n-alkanes were efficiently isolated without significant losses of the compounds of interest. The δ 13 C of n-alkanes (n-C 17 to n-C 35 ) ranged between -34.0 and -26.4‰. More depleted δ 13 C values associated to higher carbon preference index (CPI > 4) suggest prevalence of biogenic n-alkanes from terrestrial origin in the inner stations influenced by inputs from mangrove areas. Small isotopic differences between odd and even-numbered chains and 13 C-enrichment in long-chain homologues indicate a petrogenic hydrocarbons contribution. Higher concentrations of short-chain compounds associated to a more 13 C-enriched total organic carbon (TOC) were found near the most intense sewage discharges. Results show that δ 13 C of n-alkanes can be applied to a highly degraded system as the Guanabara Bay and help improve the characterization of the organic matter. Keywords: GC-C-IRMS, UCM, urea adduction, organic matter, Guanabara Bay IntroductionThe composition and distribution of hydrocarbons in sediment samples provide information about the organic matter sources and transformation processes occurring in the environment. 1 Studies on n-alkanes have often been conducted to assess the origin of hydrocarbons, such as biogenic (marine or terrestrial) or petrogenic, found in the marine environment. The assessment makes use of the difference in the n-alkane chain length to draw conclusions on the sources of organic matter. In higher plants, for example, n-alkanes from epicuticular waxes show long chains and an odd over even-numbered carbon chain predominance. 2 Algae are characterized by shorter chain lengths with no expressive odd-over-even preference. 3 In contrast, n-alkanes in fossil fuels have a wide composition range, without predominance of odd or even-numbered chains. 4 However, despite these typical fingerprints, there are cases in which n-alkane profile of different classes of organisms overlap, resulting in ambiguous interpretations of the organic material sources. 5 Given this multiplicity of origins, an interpretation of the different sources exclusively by the concentrations of n-alkanes is very limited in more complex environments. 6 During the last decades, the carbon isotopic analysis of some biomarkers have been widely used as a valuable tool to better distinguish the sources of organic matter in marine environments. 5,[7][8][9][10][11][12][13][14] The carbon isotope composition in the biosynthesized organic material depends on both the isotopic composition of the carbon source used by organisms and the isotope discrimination that occurs during carbon fixation, which includes the steps of absorption and intracellular diffusion, and also the biosynthesis of the cell components. 15 Thus, when two classes of organisms present an overlap in the n-alkane distribution, additional information can b...

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“…Recently, a variety of proxy records has been reported to document climate change in NE China (Chu et al 2009;Hong et al 2005Hong et al , 2009Li et al 2011;Parplies et al 2007;Stebich et al 2009;Wang et al 2012b;You and Liu 2012). These studies mainly focused on the last deglaciation period (Parplies et al 2007;Stebich et al 2009) and the past millennium (Chu et al 2009;Sun et al 2013;Wang et al 2012b), but there are a limited number of Holocene palaeoclimatic records from the NE China (Hong et al 2005(Hong et al , 2009Li et al 2011;You and Liu 2012) that can provide insight into climate change and potential forcing mechanisms. Furthermore, these Holocene palaeoclimatic records display different patterns could be attributed to dating uncertainties, lowresolution and/or climate proxy implications remains uncertain.…”

Section: Introductionmentioning

confidence: 99%

Reconstructing Mid- to Late Holocene East Asian Monsoon Variability in the Jingpo Lake, Northeastern China

Chen

Shen

2015

Earth Surface Processes and Environmental Changes in East Asia

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The Northeastern China involves complex interactions between the East Asian monsoon (EAM) circulation and the polar climate system, and plays a significant role as the bridge communicating low and high latitude climatic processes. High-resolution multi-proxy analysis of a robust AMS 14 C dated lacustrine sediment core recovered from Jingpo Lake in northeastern China provides a detailed history of East Asian monsoon (EAM) variability and vegetation changes during the Midto Late Holocene. The multi-proxy results show that the climate was relatively warm and humid during the period from 5100 to 3600 cal. yr BP, cool and dry between 3600 and 2100 cal. yr BP, and a strengthening of the EAM intensity during the period of 2100 to 150 cal. yr BP. After 150 cal. yr BP, the multi-proxy results reflecting the Jingpo Lake region is affected by intensive human activities. Our findings indicate that variability of the EAM during the Mid-to Late Holocene on multi-decadal to centennial scale are forced by changes in both solar output and oceanic-atmospheric circulations. Furthermore, we have found the evidence that abrupt climate changes coincides with the collapse or the beginning and the chaotically divided of some Chinese dynasties, which will need further research on the relationship between climate and human cultural changes.

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Alkanes, compound-specific carbon isotope measures and climate variation during the last millennium from varved sediments of Lake Xiaolongwan, northeast China

Cited by 52 publications

References 58 publications

A 1400 year environmental magnetic record from varved sediments of Lake Xiaolongwan (Northeast China) reflecting natural and anthropogenic soil erosion

A 1400 year environmental magnetic record from varved sediments of Lake Xiaolongwan (Northeast China) reflecting natural and anthropogenic soil erosion

Compound-Specific δ13C of n-Alkanes: Clean-Up Methods Appraisal and Application to Recent Sediments of a Highly Contaminated Bay

Reconstructing Mid- to Late Holocene East Asian Monsoon Variability in the Jingpo Lake, Northeastern China

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