Spatial distribution of n-alkanes in surface sediments of Selin Co Lake, central Tibetan Plateau, China

Kou, Qiangqiang; Lin, Xiangui; Wang, Junbo; Yu, Siwei; Kai, Jinlei; Laug, Andreas; Zhu, Liping

doi:10.1007/s10933-020-00148-8

Cited by 16 publications

(5 citation statements)

References 74 publications

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“…(3) Inhomogeneous distribution of n -alkanes. The n -alkanes are never homogeneously distributed in a lake sediment, as evidenced by various samples within a lake (Sarkar et al 2014; Kou et al 2021).…”

Section: Resultsmentioning

confidence: 99%

ASSESSING ¹⁴C BLANKS IN THE SMALL-SCALE ANALYSIS OF N-ALKANE COMPOUND-SPECIFIC-RADIOCARBON-ANALYSIS

Reetz,

Friedrich,

Birk

et al. 2024

Radiocarbon

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Compound-specific radiocarbon analysis (CSRA) provides the possibility to date sample material at a molecular level. N-alkanes are considered as specific compounds with high potential to CSRA. As these compounds originate from plant waxes, their radiocarbon (14C) analysis can provide valuable information about the age and origin of organic materials. This helps to reconstruct and understand environmental conditions and changes in vegetation in the past. However, CSRA has two main challenges: The small sample size of CSRA samples, making them extremely sensitive to blank effects, and the input of unknown amounts of extraneous carbon during the analytical procedure. According to the previous study from Sun and co-workers, we used different-sized aliquots of leaves Fagus sylvatica (nC27, nC29) and Festuca rubra agg (nC31, nC33) as modern standards and two commercial standards (nC26, nC28) as fossil standards for blank determination. A third commercial standard (nC27) with predetermined radiocarbon content of F14C = 0.71 (14C age of 2700 BP) serves to evaluate the blank correction. We found that the blank assessment of Sun and co-workers is also applicable to n-alkanes, with a minimum sample size of 15 µg C for dependable CSRA dates. We determined that the blank introduced during the analytical procedure has a mass of (4.1 ± 0.7) µg carrying a radiocarbon content of F14C = 0.25 ± 0.05. Applying the blank correction to a sediment sample from Lake Holzmaar (Germany) shows that all four isolated n-alkanes have similar 14C ages. However, the bulk material of the sediment and branches found in the sediment core are younger than the CSRA dates. We conclude that the disparity between the actual age of analysed organic material and the age inferred from radiocarbon results, which can occur in sediment traps due to delayed deposition, is the reason for the CSRA age.

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Section: Resultsmentioning

confidence: 99%

ASSESSING ¹⁴C BLANKS IN THE SMALL-SCALE ANALYSIS OF N-ALKANE COMPOUND-SPECIFIC-RADIOCARBON-ANALYSIS

Reetz,

Friedrich,

Birk

et al. 2024

Radiocarbon

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“…Siling Co (31°34′00″N -31°51′00″N, 88°33′00″E -89°21′00″E) is the largest lake in the Tibet Autonomous Region. The lake is 4,530 m above sea level and the maximum depth is about 50 m. The climate in the lake area is mostly in the plateau sub-frigid zone, with a semi-arid climate as the main [47]. The multi-year average temperature is 0.2 ℃, the annual precipitation is 290-321 mm [48], and the lake water pH is 9.4-9.7 (Chen 2001).…”

Section: Study Areasmentioning

confidence: 99%

Factors Driving Wetland Herbs Distribution Range of Lake-Terrestrial Ecotone in Tibet, China

Zheng¹,

Li²,

Ye³

et al. 2021

Preprint

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Background: Lake is a critical part of Tibet's hydrological cycle, the lake-terrestrial ecotone is the most sensitive area in the water and terrestrial ecosystem. For the ecological protection and maintenance of the lakeside zone, defining the upper boundary of the lake-terrestrial ecotone is a key issue that needs to be solved urgently. However, the ecological characteristics of lake-terrestrial ecotone made it diffcult to delimit. Wetland herbs are characteristic plants of the radiant belt toward the land of the lake-terrestrial ecotone, and their distribution range can be used to reflect the upper boundary of the lake-terrestrial ecotone. We took Baksum Lake, Yambdroktso, Namtso, Siling Co as examples, based on the spatial structure of the lake-terrestrial ecotone, used the moving split-window technology (MSWT) delimited the range of wetland herbs.Results:The results of MSWT showed the distribution range of wetland herbs in each lake-terrestrial ecotone with the natural-wetland type sampling line of Baksum Lake, Yambdroktso, Namtso, Siling Co was 51m, 56m, 33~53m, 19~31m. DCA showed number of wetland herbs species,BK1＞YT1=NT1＞NT2＞SC1=SC2. PCA, RDA showed SMO, pH, SSC, and soil nutrient content had obvious correlation with distribution range. Conclusion:MSWT was a feasible method to delimit the distribution range of wetland herbs. SMO, pH, SSC, and soil nutrient content were all-important environmental factors affect the wetland herbs distribution range of the four lakes, however, the SMO was the most important factor. Besides, compare with the lakes in the lower Yangtze Plain,the high-density population distribution,high-intensitive human activity invaded the plants' growth area, resulting in a smaller distribution range.

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“…We adopt the isobaths data of the Siling Co, acquired using the Ekman-Birge grab sampler in 2017 (Kou et al, 2021), as the lake bottom elevations (bathymetry), and interpolate them onto a 500 m-by-500 m grid (Figure S2 in Supporting Information S1). We subtract the bathymetry from the annual water level elevation to obtain the water depths of each grid on each year from 1990 to 2022 (Figure S3 in Supporting Information S1).…”

Section: Loading Changes Of the Siling Comentioning

confidence: 99%

Lower Crust Viscosity in Central Tibet Inferred From InSAR Derived Deformation Around Siling Co Lake After Its Rapid Expansion in the 2000s

Fan,

Wang,

Shi

2023

Geophysical Research Letters

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Constraining the lithospheric rheology of Tibetan Plateau is important for the physical understanding of its tectonics. Siling Co, the largest high‐altitude lake in the world, has experienced a rapid water level increase in the 2000s. The resulting loading changes stimulate the viscoelastic response of the lower crust, giving access to study the lithospheric rheology in central Tibet. Here, we derive a clear subsidence signal around the lake with peak velocity of 4 mm/yr from two tracks of Sentinel‐1 InSAR images acquired from 2017 to 2022. Our viscoelastic modeling suggests a ductile layer 15 km beneath the surface with a decadal‐scale, steady‐state viscosity of 1–4 × 1019 Pa s. This value is consistent with the viscosity inferred from millennium‐scale shoreline changes, but is about 10 times higher than the viscosities derived from the deformation surrounding Siling Co before 2011, highlighting the role of transient viscosity in controlling the surface deformation.

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Spatial distribution of n-alkanes in surface sediments of Selin Co Lake, central Tibetan Plateau, China

Cited by 16 publications

References 74 publications

ASSESSING ¹⁴C BLANKS IN THE SMALL-SCALE ANALYSIS OF N-ALKANE COMPOUND-SPECIFIC-RADIOCARBON-ANALYSIS

ASSESSING ¹⁴C BLANKS IN THE SMALL-SCALE ANALYSIS OF N-ALKANE COMPOUND-SPECIFIC-RADIOCARBON-ANALYSIS

Factors Driving Wetland Herbs Distribution Range of Lake-Terrestrial Ecotone in Tibet, China

Lower Crust Viscosity in Central Tibet Inferred From InSAR Derived Deformation Around Siling Co Lake After Its Rapid Expansion in the 2000s

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Spatial distribution of n-alkanes in surface sediments of Selin Co Lake, central Tibetan Plateau, China

Cited by 16 publications

References 74 publications

ASSESSING 14C BLANKS IN THE SMALL-SCALE ANALYSIS OF N-ALKANE COMPOUND-SPECIFIC-RADIOCARBON-ANALYSIS

ASSESSING 14C BLANKS IN THE SMALL-SCALE ANALYSIS OF N-ALKANE COMPOUND-SPECIFIC-RADIOCARBON-ANALYSIS

Factors Driving Wetland Herbs Distribution Range of Lake-Terrestrial Ecotone in Tibet, China

Lower Crust Viscosity in Central Tibet Inferred From InSAR Derived Deformation Around Siling Co Lake After Its Rapid Expansion in the 2000s

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ASSESSING ¹⁴C BLANKS IN THE SMALL-SCALE ANALYSIS OF N-ALKANE COMPOUND-SPECIFIC-RADIOCARBON-ANALYSIS

ASSESSING ¹⁴C BLANKS IN THE SMALL-SCALE ANALYSIS OF N-ALKANE COMPOUND-SPECIFIC-RADIOCARBON-ANALYSIS