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Article ; Online: Discussion on the need for correction during isotopic analysis of nitrogen by the denitrifier method.

Hu, Jing / Pan, Mengyan / Li, Yuliang / Xing, Meng / Cao, Yunning / Yang, Kaili / Liu, Weiguo

RSC advances

2023 Volume 13, Issue 20, Page(s) 13834–13839

Abstract: The nitrogen and oxygen isotopes of ... ...

Abstract	The nitrogen and oxygen isotopes of NO
Language	English
Publishing date	2023-05-05
Publishing country	England
Document type	Journal Article
ISSN	2046-2069
ISSN (online)	2046-2069
DOI	10.1039/d3ra00371j
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Article ; Online: Apparent fractionation of hydrogen isotope from precipitation to leaf wax n-alkanes from natural environments and manipulation experiments.

Liu, Hu / Wang, Sizhuang / Wang, Huanye / Cao, Yunning / Hu, Jing / Liu, Weiguo

The Science of the total environment

2023 Volume 877, Page(s) 162970

Abstract: Knowledge of hydrogen isotopic fractionation (ε) of plant leaf waxes is the foundation for applying hydrogen isotope values ( ... ...

Abstract	Knowledge of hydrogen isotopic fractionation (ε) of plant leaf waxes is the foundation for applying hydrogen isotope values (δ
Language	English
Publishing date	2023-03-21
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2023.162970
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Article: Systematical δ13C investigations of TOC in aquatic plants, DIC and dissolved CO2 in lake water from three Tibetan Plateau lakes

Liu, Hu / Liu, Jia / Hu, Jing / Cao, Yunning / Xiao, Shangbin / Liu, Weiguo

Ecological indicators. 2022 July, v. 140

2022

Abstract: The carbon isotope values (δ¹³C) of aquatic plants are of great significance for recognizing carbon cycles and tracing environmental changes in lakes. Yet, the influence of δ¹³C values of their utilizing carbon sources (especially in the case of CO₂ ... ...

Abstract	The carbon isotope values (δ¹³C) of aquatic plants are of great significance for recognizing carbon cycles and tracing environmental changes in lakes. Yet, the influence of δ¹³C values of their utilizing carbon sources (especially in the case of CO₂ separated from the HCO₃– in water) on their δ¹³C differences have never been evaluated, which is mainly due to the lack of CO₂ δ¹³C investigations in lake water. In this study, we used a newly developed fast-response automated gas equilibrator for real-time concentration and δ¹³C determination of dissolved CO₂ in the surface and bottom lake water of Lake Tuosu, Lake Qinghai and Lake Keluke, China. Moreover, we determined the corresponding δ¹³C values of total organic carbon (TOC) of a submerged plant (Potamogeton) and an alga (Cladophora), as well as the δ¹³C values of dissolved inorganic carbon (DIC) in bottom lake water. The results showed that the CO₂ δ¹³C values of bottom and surface water in these three lakes did not show significant differences and the δ¹³C values of CO₂ at different water depths also did not show significant differences. However, Potamogeton had higher TOC δ¹³C values (average 14–16‰) than Cladophora in these lakes. Although Potamogeton and Cladophora could utilize HCO₃– as an additional carbon source whose δ¹³C values were more positive (ca. 7–8‰) than CO₂, this effect on their δ¹³C values was no >4‰ after evaluation. Thus, our results show that the δ¹³C values of carbon sources (including CO₂ and HCO₃–) are not the main factors in determining the TOC δ¹³C difference between Potamogeton and Cladophora, which could be primarily related to the biosynthetic fractionation for different aquatic plant species. Our results benefit further understanding and interpretations of δ¹³C variations in carbon cycles and paleoenvironment reconstructions for lakes.
Keywords	Cladophora ; Potamogeton ; algae ; automation ; biosynthesis ; dissolved inorganic carbon ; fractionation ; lakes ; paleoecology ; submerged aquatic plants ; surface water ; total organic carbon ; China
Language	English
Dates of publication	2022-07
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	2036774-0
ISSN	1872-7034 ; 1470-160X
ISSN (online)	1872-7034
ISSN	1470-160X
DOI	10.1016/j.ecolind.2022.109060
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Article: Opposing industrial era moisture patterns between basins and mountains in southern arid Central Asia

Zhao, Jiaju / Li, Xiangzhong / He, Yuxin / Cao, Yunning / Hu, Jing

Catena. 2022 Aug., v. 215

2022

Abstract: Investigations of the evolution of naturally and anthropogenically driven hydrology in arid regions are of great significance for hydrological forecasts. Here, we built the past ∼500-year history of lake area and discharge of Lake Tuosu in the ... ...

Abstract	Investigations of the evolution of naturally and anthropogenically driven hydrology in arid regions are of great significance for hydrological forecasts. Here, we built the past ∼500-year history of lake area and discharge of Lake Tuosu in the northeastern Qaidam Basin. We found that the lake area and inflow variations were sensitive to westerly-forced winter-spring precipitation and showed long-term decreasing trends after 1850. Enhanced local human activities (e.g., agricultural irrigation) led to further rapid shrinkage of Lake Tuosu during 1990–2000, and the lake size reached its minimum in the past 500 years in approximately 2000. Our integrated moisture indices for mountains and basins in southern arid Central Asia showed opposing trends, and the humidity gradient from mountains to basins successively increased after 1850, which may be linked to the migration of the boreal westerlies, global warming, and human activities. After 1950, the humidity increased further, reaching its maximum value in approximately 2000, which likely resulted from the excessive utilization of water resources from anthropogenic activities. Therefore, the mountain-river-basin hydrological system in arid Central Asia has changed significantly, beyond the natural variation pattern, after CE 1950. Therefore, integrated management and rational utilization of water resources are important for ecological protection and sustainable development in the future.
Keywords	basins ; catenas ; humans ; humidity ; hydrology ; irrigated farming ; lakes ; shrinkage ; sustainable development ; Central Asia
Language	English
Dates of publication	2022-08
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	519608-5
ISSN	1872-6887 ; 0008-7769 ; 0341-8162
ISSN (online)	1872-6887 ; 0008-7769
ISSN	0341-8162
DOI	10.1016/j.catena.2022.106367
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Article ; Online: Climatic significance of modern minute land snail shells δ13C and δ18O on the Chinese Loess Plateau

Zong, Xiulan / Song, Yougui / Dong, Jibao / Li, Yue / Liu, Weiguo / Cao, Yunning / Xing, Meng / Liu, Huifang / Hu, Jing

Ecological Indicators. 2022 Dec., v. 145 p.109733-

2022

Abstract: Land snails are abundant and well preserved in loess-paleosol sequences on the Chinese Loess Plateau (CLP) and are often regarded as valuable climatic indicators in paleoclimate reconstruction. To date, many stable isotope investigations have been ... ...

Abstract	Land snails are abundant and well preserved in loess-paleosol sequences on the Chinese Loess Plateau (CLP) and are often regarded as valuable climatic indicators in paleoclimate reconstruction. To date, many stable isotope investigations have been carried out on land snail shells (e.g., δ¹³Cₛₕₑₗₗ and δ¹⁸Oₛₕₑₗₗ) from diverse geographical and climatic regions. However, few studies have been conducted on modern minute land snails (2-10 mm) on the CLP, and their climatic significance has not been adequately understood. Here, we present new δ¹³Cₛₕₑₗₗ and δ¹⁸Oₛₕₑₗₗ data from four minute modern land snails (Pupilla aeoli, Gastrocopta armigerella, Opeas striatissimum, Vallonia tenera), and analyses of their correlations with climatic factors (growing season temperature, precipitation and relative humidity) were conducted to examine their climatic significance across the CLP. The results show that δ¹³Cₛₕₑₗₗ can record local vegetation information and has the potential to be a reliable precipitation proxy. Interestingly, δ¹⁸Oₛₕₑₗₗ exhibits spatially scattered values in the studied region, and these data yielded poor correlations with various climatic parameters, such as precipitation amount, temperature and relative humidity. Given the similar spatial characteristics of observed precipitation δ¹⁸O (δ¹⁸Oₚ), these phenomena may support the dominant control of δ¹⁸Oₚ on δ¹⁸Oₛₕₑₗₗ.
Keywords	paleoclimatology ; relative humidity ; snails ; stable isotopes ; temperature ; vegetation ; China ; Minute land snails ; Chinese Loess Plateau (CLP) ; Carbon and oxygen isotope ; Precipitation δ18O
Language	English
Dates of publication	2022-12
Publishing place	Elsevier Ltd
Document type	Article ; Online
Note	Use and reproduction
ZDB-ID	2036774-0
ISSN	1872-7034 ; 1470-160X
ISSN (online)	1872-7034
ISSN	1470-160X
DOI	10.1016/j.ecolind.2022.109733
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Article ; Online: Evaluating the accuracy and reliability of compound-specific carbon isotopic analysis by GC/C/IRMS with the addition of a reduction furnace.

Cao, Yunning / Liu, Hu / Hu, Jing / Wang, Zheng / Zhu, Mengshu / Liu, Xu / Yang, Kaili / Gan, Haijiao / Liu, Weiguo

Rapid communications in mass spectrometry : RCM

2022 , Page(s) e9450

Abstract: Rationale: Gas chromatography-combustion-isotope ratio mass spectrometry (GC/C/IRMS) is widely used for compound-specific carbon isotopic analysis. However, current isotopic analysis systems utilize the GC IsoLink combustion reactor, and independent ... ...

Abstract	Rationale: Gas chromatography-combustion-isotope ratio mass spectrometry (GC/C/IRMS) is widely used for compound-specific carbon isotopic analysis. However, current isotopic analysis systems utilize the GC IsoLink combustion reactor, and independent reduction furnaces are not implemented. Therefore, whether this limitation in furnace use affects the precision of compound-specific carbon isotopic analysis needs to be evaluated. Methods: We attempted to add a separate reduction furnace to the GC IsoLink interface and compared the δ Results: For n-alkanes and fatty acid methyl esters, the δ Conclusions: The adding of an independent reduction furnace had no significant effect on the δ
Language	English
Publishing date	2022-12-07
Publishing country	England
Document type	Journal Article
ZDB-ID	58731-x
ISSN	1097-0231 ; 0951-4198
ISSN (online)	1097-0231
ISSN	0951-4198
DOI	10.1002/rcm.9450
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Zs.A 3461: Show issues

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Article ; Online: Identification of nitrate sources in the Jing River using dual stable isotopes, Northwest China

Hu, Jing / Pan, Mengyan / Han, Tianhao / Zhuang, Zhi / Cao, Yunning / Yang, Kaili / Li, Yuliang / Liu, Weiguo

Environ Sci Pollut Res. 2021 Dec., v. 28, no. 48 p.68633-68641

2021

Abstract: Nitrate (NO₃⁻) contamination has become a dominant international problem in the aquatic environment, so identifying the sources and transformations of NO₃⁻ is the basis for improving water quality. Since the Jing River is the largest tributary of the Wei ...

Abstract	Nitrate (NO₃⁻) contamination has become a dominant international problem in the aquatic environment, so identifying the sources and transformations of NO₃⁻ is the basis for improving water quality. Since the Jing River is the largest tributary of the Wei River, to understand its water quality, this study collected surface water samples from the Shaanxi section of the Jing River during the dry season. The potential sources of NO₃⁻ were analyzed by hydrochemical and bi-isotopic methods, and the SIAR model was used to estimate the proportional contribution of each source. Results indicated that NO₃⁻-N was the main form of inorganic nitrogen in this area, and the average total nitrogen content was 10.23 mg·L⁻¹, which showed that nitrogen pollution was highly serious; the transformation process of nitrogen in this study area was mainly nitrification; The results of Bayesian model showed that manure and sewage contributed to the most NO₃⁻ (64.39%) in the dry season, followed by soil nitrogen, which was 26.35%. These results help to adopt better nitrogen management measures to meet the national environmental quality standards for surface water.
Keywords	Bayesian theory ; aquatic environment ; dry season ; hydrochemistry ; models ; nitrates ; nitrification ; nitrogen ; pollution ; rivers ; sewage ; soil ; surface water ; total nitrogen ; water quality ; China
Language	English
Dates of publication	2021-12
Size	p. 68633-68641.
Publishing place	Springer Berlin Heidelberg
Document type	Article ; Online
ZDB-ID	1178791-0
ISSN	1614-7499 ; 0944-1344
ISSN (online)	1614-7499
ISSN	0944-1344
DOI	10.1007/s11356-021-15380-6
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Article ; Online: Identification of nitrate sources in the Jing River using dual stable isotopes, Northwest China.

Hu, Jing / Pan, Mengyan / Han, Tianhao / Zhuang, Zhi / Cao, Yunning / Yang, Kaili / Li, Yuliang / Liu, Weiguo

Environmental science and pollution research international

2021 Volume 28, Issue 48, Page(s) 68633–68641

Abstract: ... Nitrate ( ... ...

Abstract	Nitrate (NO
MeSH term(s)	Bayes Theorem ; China ; Environmental Monitoring ; Nitrates/analysis ; Nitrogen Isotopes/analysis ; Rivers ; Water Pollutants, Chemical/analysis
Chemical Substances	Nitrates ; Nitrogen Isotopes ; Water Pollutants, Chemical
Language	English
Publishing date	2021-07-17
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1178791-0
ISSN	1614-7499 ; 0944-1344
ISSN (online)	1614-7499
ISSN	0944-1344
DOI	10.1007/s11356-021-15380-6
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Article: Changes in the depth of Lake Qinghai since the last deglaciation and asynchrony between lake depth and precipitation over the northeastern Tibetan Plateau

Wang, Zheng / Zhang, Fan / Li, Xiangzhong / Cao, Yunning / Hu, Jing / Wang, Huangye / Lu, Hongxuan / Li, Ting / Liu, Weiguo

Global and planetary change. 2020 May, v. 188

2020

Abstract: As a transitional region between arid and semi-arid areas, and the climatic junction where the Asian summer monsoon and the Westerlies interact strongly, the climatic pattern of northeastern Tibetan Plateau has always been the focus of paleoclimate ... ...

Abstract	As a transitional region between arid and semi-arid areas, and the climatic junction where the Asian summer monsoon and the Westerlies interact strongly, the climatic pattern of northeastern Tibetan Plateau has always been the focus of paleoclimate research. In this study, the changes in the lake depth of Lake Qinghai on the northeastern Tibetan Plateau were reconstructed from analyses of biomarkers in sediment records from the center of the lake and aeolian deposits on its southern bank. On millennial scale, the lake depth showed a fluctuating upward trend from the minimum depth at 15.6 ka to the maximum depth at 5.9 ka, revealing an overall warming-wetting pattern since the last deglaciation. Compared to the typical monsoon-dominated areas, the relatively humid late Holocene of Lake Qinghai appears to have been related to a weakened evaporation on the long-term trend. We show that on a long-term scale, precipitation may control the rate of changes in lake depth. This reasonably explains the asynchrony of precipitation and lake depth over the northeastern Tibetan Plateau during the mid-Holocene.
Keywords	Holocene epoch ; biomarkers ; eolian deposits ; evaporation ; glaciation ; lakes ; monsoon season ; paleoclimatology ; semiarid zones ; summer ; China
Language	English
Dates of publication	2020-05
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	2016967-X
ISSN	0921-8181
ISSN	0921-8181
DOI	10.1016/j.gloplacha.2020.103156
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Article: Eolian dust activity during the last ~850 years on the southeastern margin of the arid Central Asia

Wu, Xudong / Li, Xiangzhong / Li, Junfeng / Wang, Min / Ji, Ming / Cao, Yunning / Hu, Jing / Zhang, Pu

Palaeogeography, palaeoclimatology, palaeoecology. 2020 Dec. 15, v. 560

2020

Abstract: Eolian dust activity studies on the arid Central Asia (ACA), one of the world's largest dust sources, are of great importance to the global climatic system. Grain size distributions (GSDs) can provide information on sediment sources, transport processes ... ...

Abstract	Eolian dust activity studies on the arid Central Asia (ACA), one of the world's largest dust sources, are of great importance to the global climatic system. Grain size distributions (GSDs) can provide information on sediment sources, transport processes and sedimentary environments. As a result, GSD is the most frequently applied proxy in reconstruction of past eolian dust activities of the ACA using lake sediments. The GSD dataset for a core spanning the last ~850 years from Kuhai Lake on the northeastern Tibetan Plateau was unmixed by end-member analysis (EMA) for reconstruction of past eolian dust activities on the southeastern margin of the ACA. The results suggest that EM 2 and EM 3, which were added together to form an eolian dust activity proxy, represent the proximal eolian suspension and saltation loads, respectively. The fractional abundances of EMs suggest that siliciclastic materials in the studied core were mainly from eolian contributions. The occurrence of enhanced eolian dust activities within the cold Little Ice Age period together with the GSDs of EM 2 and EM 3 indicate that eolian dust activities on the southeastern margin of the ACA were basically governed by the Siberian High-produced Asian Winter Monsoon over the last millennium. At decadal to centennial scales, enhanced eolian dust activities generally correspond to warm periods with high total solar irradiance (TSI). Increased temperatures as the result of high TSI would have caused larger increases in evaporation than in precipitation, and hence deteriorated vegetation cover and increased dust sources availability.
Keywords	cold ; data collection ; dust ; evaporation ; lakes ; monsoon season ; palaeogeography ; paleoclimatology ; paleoecology ; sediments ; solar radiation ; vegetation cover ; Central Asia ; China
Language	English
Dates of publication	2020-1215
Publishing place	Elsevier B.V.
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	417718-6
ISSN	0031-0182
ISSN	0031-0182
DOI	10.1016/j.palaeo.2020.110022
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