Hydrological regulation of chemical weathering and dissolved inorganic carbon biogeochemical processes in a monsoonal river

2020 ◽  
Vol 34 (12) ◽  
pp. 2780-2792 ◽  
Author(s):  
Jing Liu ◽  
Jun Zhong ◽  
Hu Ding ◽  
Fu‐Jun Yue ◽  
Cai Li ◽  
...  
Keyword(s):  
Chemical Weathering ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Biogeochemical Processes

scholarly journals Export fluxes of dissolved inorganic carbon to the northern Indian Ocean from the Indian monsoonal rivers

2019 ◽  
Vol 16 (2) ◽  
pp. 505-519 ◽  
Author(s):  
Moturi S. Krishna ◽  
Rongali Viswanadham ◽  
Mamidala H. K. Prasad ◽  
Vuravakonda R. Kumari ◽  
Vedula V. S. S. Sarma
Keyword(s):  
Indian Ocean ◽  
Spatial Variability ◽  
Bay Of Bengal ◽  
Arabian Sea ◽  
Chemical Weathering ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Precipitation Pattern ◽  
Freshwater Flux ◽  
Northern Indian Ocean

Abstract. Rivers are an important source of dissolved inorganic carbon (DIC) to the adjacent coastal waters. In order to examine the spatial variability in the distribution and major sources of DIC in the Indian monsoonal rivers and to quantify their export flux to the northern Indian Ocean, 27 major and medium-sized rivers were sampled during the discharge period. Significant spatial variability in concentrations of DIC (3.4–73.6 mg L−1) was observed, and it is attributed to spatial variations in the precipitation pattern, the size of rivers, pollution and lithology of the catchments. The stable isotopic composition of DIC (δ13CDIC) also showed strong spatial variability (−13.0 ‰ to −1.4 ‰) in the Indian monsoonal rivers with relatively depleted δ13CDIC values in rivers of the northwest of India (-11.1±2.3 ‰) and enriched values in the southeast of India (-3.5±2.3 ‰). Results of the linear least-squares regression models of Keeling and Miller–Tan's plots indicated that the chemical weathering of carbonate and silicate minerals by soil CO2 is the major source of DIC in the Indian monsoonal rivers. Spatial variability in the deviation of δ13CDIC from the approximated δ13C of the source may probably be due to dominant autotrophic production in rivers of the southeastern region, whereas heterotrophic decomposition of organic matter largely influences the other Indian monsoonal rivers. It is estimated that the Indian monsoonal rivers annually export ∼10.3 Tg of DIC to the northern Indian Ocean, of which the major fraction (75 %) enters into the Bay of Bengal, and the remaining fraction reaches to the Arabian Sea. This is consistent with the freshwater flux, which is 3 times higher for the Bay of Bengal (∼378 km3 yr−1) than for the Arabian Sea (122 km3 yr−1). Despite discharge from the Indian monsoonal rivers accounting for only 1.3 % of the global freshwater discharge, they disproportionately export 2.5 % of the total DIC exported by the world's major rivers. Despite rivers from the region in the southwest (SW) of India exporting DIC that is an order of magnitude lower (0.3 Tg yr−1) than the rivers from other regions of India, the highest yield of DIC was found in the rivers of the SW region of India. It is attributed to intense precipitation (∼3000 mm), favorable natural vegetation of tropical moist deciduous and tropical wet evergreen and semi-evergreen forests, tropical wet climate, high soil organic carbon, and the dominance of red loamy soils in catchments of the rivers of the SW region.

A Study on the Watershed Chemical Weathering in the Water Source Area of the Central Guizhou Water Control Projects

2012 ◽  
Vol 212-213 ◽  
pp. 493-497
Author(s):  
Shu Lin Jiao ◽  
Hong Liang ◽  
Ting Sun
Keyword(s):  
Seasonal Variation ◽  
Land Surface ◽  
Chemical Weathering ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Source Area ◽  
Water Source ◽  
Water Control ◽  
Significant Seasonal Variation ◽  
Hydrological Station

To study the chemical weathering of the water source area of Central Guizhou water control project(CGWCP), a hydrological year observational study was carried out during May 2010 to Jane 2011 in the Yangchang hydrological station section in the Sancha River basin,in which the output fluxes and its weathering modules of the total dissolved substances(TDS) and dissolved inorganic carbon (DIC) were analyzed quantitatively.The results showed that :the weathering modules were 9.771×107g.km-2.a-1 of TDS and 7.996×106g.km-2.a-1 of DIC respectively with notely seasonal variation that 93.1% of TDS fluxes and 92.8% of DIC fluxes were output during the high temperature and rainy season from June to November 2010,as well as showing a striking decreasing trends from Sumer(6~8), Fall(9~11), Spring(3~5) to Winter(12~2).Chemical weathering modules demonstrated that significant seasonal variation of thermal and rainy conditions striking impacted karst processes had been closely related to characteristics of the watershed land surface, climatic, as well as hydrological processes.

scholarly journals Hydrologic Transport of Dissolved Inorganic Carbon and Its Control on Chemical Weathering

2017 ◽  
Vol 122 (10) ◽  
pp. 2016-2032 ◽  
Author(s):  
Salvatore Calabrese ◽  
Anthony J. Parolari ◽  
Amilcare Porporato
Keyword(s):  
Chemical Weathering ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Hydrologic Transport

scholarly journals Hydrological and biogeochemical controls on temporal variations of dissolved carbon and solutes in a karst river, South China

2021 ◽  
Vol 33 (1) ◽  
Author(s):  
Jing Liu ◽  
Jun Zhong ◽  
Shuai Chen ◽  
Sen Xu ◽  
Si-Liang Li
Keyword(s):  
Climate Change ◽  
Chemical Weathering ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Global Climate ◽  
Carbon Dynamics ◽  
Temporal Variations ◽  
High Flow ◽  
Dissolved Carbon ◽  
Weathering Processes

Abstract Background Understanding the responses of riverine dissolved carbon dynamics and chemical weathering processes to short-term climatic variabilities is important to understand the Surface-Earth processes under ongoing climate change. Temporal variations of solutes and stable carbon isotope of dissolved inorganic carbon (δ13CDIC) were analysed during a hydrological year in the Guijiang River, South China. We aimed to unravel the chemical weathering processes and carbon dynamics in karst areas under ongoing climate changes. Results Significant positive relationships were found between weathering rates and climatic factors (i.e. temperature and discharge) over the hydrological year. The total flux of CO2 consumption (760.4 × 103 mol/km2/year) in the Guijiang River was much higher than the global mean flux, with a higher CO2 consumption capacity in the Guijiang River relative to most other global rivers. Chemical weathering fluxes in this karst area showed high sensitivity to global climate change. CO2 evasion during the warm–wet seasons was much lower than those during cold–dry seasons. Light δ13CDIC values occurred under high-flow conditions, corresponding with the high temperatures in high-flow seasons. IsoSource modelling revealed that biological carbon could account for 53% of all dissolved inorganic carbon (DIC), controlling the temporal carbon variabilities. Conclusion This study quantitatively evaluated the temporal variations in CO2 fluxes and carbon cycling of karstic river systems and demonstrated that riverine carbon cycling will have a higher sensibility to ongoing global climate change. High discharges accelerate solutes transport, with relatively large quantities of 13C-depleted carbon being flushed into rivers. Meanwhile, high temperatures also accelerate organic carbon mineralisation, producing high content of soil CO2, whose influx can shift the 13C-depleted values in the high-flow seasons. Taken together, biological carbon influx should be responsible for the temporal carbon dynamics.

Hydrological budget, carbon sources and biogeochemical processes in Lac Pavin (France): Constraints from δ18O of water and δ13C of dissolved inorganic carbon

2008 ◽  
Vol 23 (10) ◽  
pp. 2800-2816 ◽  
Author(s):  
N. Assayag ◽  
D. Jézéquel ◽  
M. Ader ◽  
E. Viollier ◽  
G. Michard ◽  
...  
Keyword(s):  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Carbon Sources ◽  
Biogeochemical Processes

Isotopic and Chemical Constraints on the Biogeochemistry of Dissolved Inorganic Carbon and Chemical Weathering in the Karst Watershed of Krka River (Slovenia)

2013 ◽  
Vol 19 (3) ◽  
pp. 209-230 ◽  
Author(s):  
Saša Zavadlav ◽  
Tjaša Kanduč ◽  
Jennifer McIntosh ◽  
Sonja Lojen
Keyword(s):  
Chemical Weathering ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon

PHYSIOLOGICAL EFFECTS OF DISSOLVED INORGANIC CARBON ON COMMON SUBMERGED MACROPHYTES

2010 ◽  
Vol 33 (6) ◽  
pp. 1020-1030 ◽  
Author(s):  
Yan-Hui ZHANG ◽  
Yan-Jie AN ◽  
Chi ZHU ◽  
Shao YANG
Keyword(s):  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Submerged Macrophytes ◽  
Physiological Effects
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