Total organic carbon isotopes: A novel proxy of lake level from Lake Qinghai in the Qinghai–Tibet Plateau, China

Liu, Weiguo; Li, Xiangzhong; An, Zhisheng; Xu, Liming; Zhang, Qingle

doi:10.1016/j.chemgeo.2013.04.009

Cited by 135 publications

(87 citation statements)

References 50 publications

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“…Nevski), were responsible for terrestrial plant's contribution. Based on our recent studies conducted in the Yanqi Basin (Wang et al, 2015;Zhang, 2013), C : N ratio was 22.1 ± 9.9 and 10 ± 1.8, and δ 13 C org value was −26.4 ± 1.2 and −23.6 ± 1.3 ‰ for the native plants and surface soils around the lake, respectively. We used the values as the end-members for the mixing model.…”

Section: Calculations Of Toc Sourcesmentioning

confidence: 99%

“…For the analyses of δ 13 C org , approximately 0.2 g of the freeze-dried sediment sample was pretreated with 5-10 mL 2 M HCl for 24 h at room temperature to remove carbonate, and then rinsed to a pH of approximately 7 with deionized water and dried at 40-50 • C (Liu et al, 2013). The pre-treated samples were combusted in a Thermo elemental analyzer integrated with an isotope ratio mass spectrometer (Delta Plus XP, Thermo Finnigan MAT, Germany).…”

Section: Field Sampling and Analysesmentioning

confidence: 99%

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Spatial distribution and sources of organic carbon in the surface sediment of Bosten Lake, China

Wang

Zhang

et al. 2015

Biogeosciences

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Abstract. Lake sediment is an important carbon reservoir. However, little is known on the dynamics and sources of sediment organic carbon in Bosten Lake. We collected 13 surface (0-2 cm) sediment samples in Bosten Lake and analyzed total organic carbon (TOC), total nitrogen (TN), stable carbon isotopic composition in TOC (δ 13 C org ), and grain size. We found a large spatial variability in TOC content (1.8-4.4 %) and δ 13 C org value (−26.77 to −23.98 ‰). Using a three-end-member mixing model with measured TOC : TN ratio and δ 13 C org , we estimated that 54-90 % of TOC was from autochthonous sources. Higher TOC content (> 3.7 %) was found in the east and central-north sections and near the mouth of the Kaidu River, which was attributable to allochthonous, autochthonous plus allochthonous, and autochthonous sources, respectively. The lowest TOC content was found in the mid-west section, which might be a result of high kinetic energy levels. Our study indicated that the spatial distribution of sediment TOC in the Bosten Lake was influenced by multiple and complex processes.

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Section: Calculations Of Toc Sourcesmentioning

confidence: 99%

Section: Field Sampling and Analysesmentioning

confidence: 99%

Spatial distribution and sources of organic carbon in the surface sediment of Bosten Lake, China

Wang

Zhang

et al. 2015

Biogeosciences

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“…Pollen-based moisture changes lag the Northern Hemisphere June insolation maxima by ~3 ka. A relatively dry climate during the early Holocene is also indicated by the significantly low lake levels of Qinghai Lake during this period (Liu et al 2013Wang et al 2014b). However, ostracod δ 18 O records from Qinghai Lake indicate a drying trend in this region throughout the Holocene, closely following Northern Hemisphere summer insolation (Liu et al 2007;Wang et al 2011;An et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Lagged response of summer precipitation to insolation forcing on the northeastern Tibetan Plateau during the Holocene

et al. 2017

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“…Total organic carbon (ToC) content in lake sediments is one of the proxies used for the analysis of lake basin ecological environments (Mackay et al, 2012), including the effective humidity (An et al, 1993;Long et al, 2010;Li et al, 2016b), precipitation (Xu et al, 2006;An et al, 2012), runoff (hartmann and Wünnemann, 2009), and has been widely used in paleoenvironmental studies (Ji et al, 2005;Xu et al, 2007;Liu et al, 2013;Kołaczek et al, 2014). in previous studies, ToC contents in surface sediments have been interpreted mainly to reflect climate factors that influence terrestrial plant growth or the input processes of terrestrial organic matter to lakes and rivers (Ji et al, 2005;Xu et al, 2007;Kołaczek et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Total organic carbon and its environmental significance for the surface sediments in groundwater recharged lakes from the Badain Jaran Desert, northwest China

Dong

Chen

et al. 2017

J Limnol

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Total organic carbon (ToC) content in lake sediments is typically used for the reconstruction of paleoenvironments. it remains uncertain, however, whether these sediment variables in lakes supplied by groundwater in the hinterland of the Badain Jaran Desert are applicable. Moreover, it is still uncertain whether the ToC content in these lakes can be used as a proxy to identify past climatic change and environmental evolution studies. in this study, the spatial distributions of the ToC contents and C/n ratios were analyzed for 109 surface sediment samples collected from five lakes without runoff recharge. The results revealed that the ToC content of the lake surface sediments was extremely low (0.03% -1.01%) and consisted of both allochthonous organic matter carried by wind, as well as autochthonous organic matter generated in the lakes. Within a lake, spatial differences in the amount of ToC found in surface sediments may be caused by several processes including bathymetry topography and wind-induced wave activity. in addition, wind-induced wave activity produces a higher ToC content, which is more pronounced in larger lakes (>0.21 km 2 ) with longer fetches. By contrast, in smaller lakes, organic matter accumulates in the deeper waters, but can be affected by many factors. it is therefore necessary to consider lake area when applying the ToC content of lake sediments for the reconstruction of a paleolake evolution. Furthermore, because the ToC content of lake sediments in hyper-arid regions is extremely low, and the organic matter may have multiple and varied sources, a single proxy (ToC) cannot be used to reconstruct lake evolution.

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Total organic carbon isotopes: A novel proxy of lake level from Lake Qinghai in the Qinghai–Tibet Plateau, China

Cited by 135 publications

References 50 publications

Spatial distribution and sources of organic carbon in the surface sediment of Bosten Lake, China

Spatial distribution and sources of organic carbon in the surface sediment of Bosten Lake, China

Lagged response of summer precipitation to insolation forcing on the northeastern Tibetan Plateau during the Holocene

Total organic carbon and its environmental significance for the surface sediments in groundwater recharged lakes from the Badain Jaran Desert, northwest China

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