Comparisons between the chemical compositions of lake water, inflowing river water, and lake sediment in Nam Co, central Tibetan Plateau, China and their controlling mechanisms

Wang, Junbo; Zhu, Liping; Wang, Yong; Ju, Jianting; Xie, Min; Daut, Gerhard

doi:10.1016/j.jglr.2010.06.013

Cited by 46 publications

(34 citation statements)

References 33 publications

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“…The precipitation occurring can remove Ca 2+ and Mg 2+ from the water into the sediment. Saturation of CaCO 3 has also been observed in other semiarid closed lakes in the Qinghai-Tibet plateau Wang et al 2010).…”

Section: Physicochemical Parameters and Major Ion Composition In Watermentioning

confidence: 60%

Water and sediment quality in Qinghai Lake, China: a revisit after half a century

Xiong

et al. 2013

Environ Monit Assess

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Section: Physicochemical Parameters and Major Ion Composition In Watermentioning

confidence: 60%

Water and sediment quality in Qinghai Lake, China: a revisit after half a century

Xiong

et al. 2013

Environ Monit Assess

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“…The lake is approximately 78 km long and the maximum width of about 44 km is in the western part of the lake [23] (Figure 1(a)). The landform of the lake basin and bathymetric survey show that it is a closed deep lake with a water depth greater than 90 m in nearly 50% of the lake area [14].…”

Section: Study Sitementioning

confidence: 99%

“…The main basin of the lake has a flat bottom, but steep slopes on the southern and northern shore areas, which show typical tectonic lake features that may indicate the existing of faults (Figure 1(b)). Because of the main inflow of river water occurring in the eastern and western parts of the lake and the transportation of high volumes of sediments into the lake it possesses gentle slopes with some alluvial fans [23].…”

Section: Study Sitementioning

confidence: 99%

“…During permanent deposition from the source to the bottom of the lake, sedimentary organic matter is influenced by a variety of factors including river inputs, underwater topography, and lake wind and induced waves, which eventually leads to different spatial distribution patterns [19][20][21][22][23][45][46][47]. In some small lakes, the spatial distribution of sedimentary organic matter is relatively simple, owing to one factor showing the greatest effect [48].…”

Section: Influence Factors and Paleolimnological Significancementioning

confidence: 99%

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The spatial distribution and sedimentary processes of organic matter in surface sediments of Nam Co, Central Tibetan Plateau

et al. 2012

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In this study, 67 surface sediment samples collected from Nam Co in central Tibet were analyzed for total carbon, total organic carbon and total nitrogen, and 51 of these samples were also analyzed for n-alkanes. The origin and spatial distribution of organic matter were then investigated using these proxies, and the control factors responsible for the spatial distribution patterns and paleolimnological significance were discussed. The results indicated that the origin of organic matter in surface sediment of Nam Co is consistent with the sources of n-alkanes, which were primarily submerged plants, followed by terrestrial plants, and then aquatic algae and bacteria. The organic matter in surface sediments of the lake showed typical spatial variability. Because of the great influence of underwater topography, river inputs and water quality, the spatial distribution of organic matter is enriched from the source to the deposit center. This spatial variability of organic matter in the lake indicates that the sediments in different areas have different sensitivities to environmental changes, which is important to reconstruction of paleoenvironments and paleoclimate using lake sediment cores.Tibetan Plateau, Nam Co, surface sediments, spatial distribution, sedimentary processes Citation:Wang Y, Zhu L P, Wang J B, et al. The spatial distribution and sedimentary processes of organic matter in surface sediments

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“…Spatial variation in the chemical composition of the lake water was shown to depend on the characteristics of its inflows. Wang et al (2010a) analyzed 76 samples of lake water and 69 samples of river water flowing into Lake Nam Co on the central Tibetan Plateau, and found that Na + , Ca…”

Section: Introductionmentioning

confidence: 99%

Comparison of surface water chemistry and weathering effects of two lake basins in the Changtang Nature Reserve, China

Wang

Liu

Jiang

et al. 2016

Journal of Environmental Sciences

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The geochemistry of natural waters in the Changtang Nature Reserve, northern Tibet, can help us understand the geology of catchments, and provide additional insight in surface processes that influence water chemistry such as rock weathering on the Qinghai-Tibet Plateau. However, severe natural conditions are responsible for a lack of scientific data for this area. This study represents the first investigation of the chemical composition of surface waters and weathering effects in two lake basins in the reserve (Lake Dogaicoring Qiangco and Lake Longwei Co). The results indicate that total dissolved solids (TDS) in the two lakes are significantly higher than in other gauged lakes on the Qinghai-Tibet Plateau, reaching 20-40 g/L, and that TDS of the tectonic lake (Lake Dogaicoring Qiangco) is significantly higher than that of the barrier lake (Lake Longwei Co). Na + and Cl − are the dominant ions in the lake waters as well as in the glacier-fed lake inflows, with chemical compositions mainly affected by halite weathering. In contrast, ion contents of inflowing rivers fed by nearby runoff are lower and concentrations of dominant ions are not significant. Evaporite, silicate, and carbonate weathering has relatively equal effects on these rivers. Due to their limited scope, small streams near the lakes are less affected by carbonate than by silicate weathering.

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Comparisons between the chemical compositions of lake water, inflowing river water, and lake sediment in Nam Co, central Tibetan Plateau, China and their controlling mechanisms

Cited by 46 publications

References 33 publications

Water and sediment quality in Qinghai Lake, China: a revisit after half a century

Water and sediment quality in Qinghai Lake, China: a revisit after half a century

The spatial distribution and sedimentary processes of organic matter in surface sediments of Nam Co, Central Tibetan Plateau

Comparison of surface water chemistry and weathering effects of two lake basins in the Changtang Nature Reserve, China

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