Geochemistry of the headwaters of the Yangtze River, Tongtian He and Jinsha Jiang: Silicate weathering and CO2 consumption

Wu, Weihua; Jun, Yang; Xu, Shidang; Yin, Handong

doi:10.1016/j.apgeochem.2008.09.005

Cited by 84 publications

(94 citation statements)

References 38 publications

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“…This can be interpreted by the fact that the Brahmaputra has the deepest gorge which has a very steep slope causing turbulent and rapid water flow. Besides, the intensive precipitation also leads to intense weathering (Wu et al 2008b and references therein).…”

Section: Comparisonmentioning

confidence: 99%

“…However, accurately quantifying the contribution of anthropogenic activity is somewhat difficult using only the major elements. Here, we assumed that the anthropogenic input is negligible in the reaches upstream because of sparse population and so we took SO 4 2-, Cl -, and NO 3 -concentrations in these reaches as riverine geochemical backgrounds (Wu et al 2008b). The results show that for all rivers, this contribution remains minor (e.g., NO 3 -/ TZ -= *1.6 %).…”

Section: Contribution From Anthropogenic Activitymentioning

confidence: 99%

“…The SWR and CWR are calculated as the sum of cations from silicate weathering and carbonate weathering as follows (Wu et al 2008b):…”

Section: The Weathering Rate In the Catchmentmentioning

confidence: 99%

“…In addition, studies on hydrochemistry of rivers provide vital information on the sources of major chemical signatures, the environmental change, and on weathering processes and associated CO 2 consumption in a catchment (Dalai et al 2002;Li et al 2011). Chemical weathering is a major sink for atmospheric CO 2 , thus knowing the chemical weathering rates is important for the determination of CO 2 consumption and its influence on global climate cooling and carbon cycle (Dalai et al 2002;Galy and France-Lanord 2001;Wu et al 2008b). Recently, those rivers originating in the southern slopes of the Himalaya have gained great concern.…”

Section: Introductionmentioning

confidence: 99%

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Hydrochemistry of the middle and upper reaches of the Yarlung Tsangpo River system: weathering processes and CO2 consumption

et al. 2015

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The study focuses on the chemical compositions of the river waters in the middle and upper reaches of the Yarlung Tsangpo river system. Samples were collected in two periods along the river system to analyze the spatiotemporal variation characteristics and to determine the weathering processes and CO 2 consumption. The results show that the chemical facies of river waters are dominated by Ca-HCO 3 type and the TDS values cover a wide range of 98.2-619.8 mg/l with an average value of 268.6 mg/l, which is higher than that of the global river waters. There are three major reservoirs (carbonates, evaporites, and silicates) contributing to the major ions, and the predominances of the reservoirs of different rivers show spatial heterogeneity. The chemical weathering rates of silicates and carbonates are 3.43 and 4.49 t/km 2 /year, respectively. Overall, the middle and upper reaches of Yarlung Tsangpo are responsible for 0.3 and 0.16 % of global atmospheric CO 2 consumption by silicates (1.7 9 10 5 mol/ km 2 /year) and carbonates (1.27 9 10 5 mol/km 2 /year), respectively. In addition, the chemical weathering fluxes of the catchments consume atmospheric CO 2 of 0.5456 Tg C/year, accounting for 0.14 % of the total organic carbon flux to the oceans by rivers globally.

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Section: Comparisonmentioning

confidence: 99%

Section: Contribution From Anthropogenic Activitymentioning

confidence: 99%

“…The SWR and CWR are calculated as the sum of cations from silicate weathering and carbonate weathering as follows (Wu et al 2008b):…”

Section: The Weathering Rate In the Catchmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrochemistry of the middle and upper reaches of the Yarlung Tsangpo River system: weathering processes and CO2 consumption

et al. 2015

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“…Thus, assessment of the hydrochemical status of surface water is urgently needed. Chemical studies on river water provide crucial information about environmental change, and contribute to determining the relationship between regional chemical weathering and hydrogeochemical reactions and their controlling factors (Han and Liu, 2000;Dalai et al, 2002;Wu et al, 2008). Additionally, they can be used to determine the origins of the main chemical signatures, the evolution of geochemical solutes, and relationship with the regional physical geography (Xia et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Hydrochemistry and its controlling factors of rivers in the source region of the Yangtze River on the Tibetan Plateau

Jiang

Yao

Liu

et al. 2015

Journal of Geochemical Exploration

106

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This study focuses on the chemical composition, and the factors controlling it, of the high mountain-rivers in the source region of the Yangtze River on the Tibetan Plateau. By comprehensive and systematic analysis, the chemical signatures, spatial variations of water quality, as well as the factors controlling them are studied. The value of the average total dissolved solids (TDS) is 778 mg/l, ranging from 117 to 5496 mg/l. In order of decreasing concentration, the main cations are Na try of the river water is controlled by lithogenic weathering processes. The Na-normalized ratio end-member diagram indicates that the weathering of silicates and carbonates is relatively significant, on the whole. There exists pronounced regional heterogeneity in the water chemistry and the factors affecting it. The northern rivers, including Chumaer He, Beilu He, and Ranchiqu, are mainly affected by evaporation and crystallization processes, while the southern rivers (Tuotuo He, Gaerqu, and Buqu) show effects from the weathering of carbonates and silicates.

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The spatiotemporal distribution of dissolved inorganic and organic carbon in the main stem of the Changjiang (Yangtze) River and the effect of the Three Gorges Reservoir

et al. 2014

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The Changjiang River supplies huge amounts of fresh water and dissolved and particulate substances to the East China Sea, thereby exerting a great influence on the coastal ecosystem. Meanwhile, the construction of the Three Gorges Reservoir (TGR) has reallocated the annual discharge, likely affecting the transportation of carbon in its various forms. The transport and transformation of carbon in Changjiang River and the effect of the TGR were discussed based on three field campaigns, a 1 year time series investigation, and historical data. Our results indicated the following: (1) Dissolved inorganic carbon (DIC) was derived from the upper stream and was significantly diluted downstream by the low-DIC waters from two large lakes. Dissolved organic carbon (DOC) was a product of anthropogenic input and showed no clear relationship with discharge. particulate organic carbon (POC) within total suspended matter (POC%) was below the global average. (2) The TGR has not measurably affected the transport of DOC downstream of the reservoir dam. However, downstream grain size has decreased and autochthonous processes have increased, resulting in a sharp increase in POC% since reservoir construction. (3) For the period 1997-2010, estimated annual DIC flux was 16.9 Tg yr À1. The regulation of river flow by the TGR has decreased the river DIC flux to the East China Sea in the autumn and increased it in the spring. Furthermore, the South-North Water Diversion will reduce the high-DIC water from the upper reach, thus affecting the biogeochemistry of the Changjiang estuary and the ecosystem of the nearby coastal ocean.

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Geochemistry of the headwaters of the Yangtze River, Tongtian He and Jinsha Jiang: Silicate weathering and CO2 consumption

Cited by 84 publications

References 38 publications

Hydrochemistry of the middle and upper reaches of the Yarlung Tsangpo River system: weathering processes and CO2 consumption

Hydrochemistry of the middle and upper reaches of the Yarlung Tsangpo River system: weathering processes and CO2 consumption

Hydrochemistry and its controlling factors of rivers in the source region of the Yangtze River on the Tibetan Plateau

The spatiotemporal distribution of dissolved inorganic and organic carbon in the main stem of the Changjiang (Yangtze) River and the effect of the Three Gorges Reservoir

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