Impact of sulfuric and nitric acids on carbonate dissolution, and the associated deficit of CO 2 uptake in the upper–middle reaches of the Wujiang River, China

Qibo, Huang; Qin, Xiaoqun; Liu, Pengyu; Zhang, Liankai; Su, Chuntian

doi:10.1016/j.jconhyd.2017.05.006

Cited by 41 publications

(17 citation statements)

References 35 publications

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“…It has shown that the contribution of silicate weathering to CO 2 consumption has often been ignored in previous studies of karst carbon sink [14,27,28,52,53], which may lead to an overestimation of the CCW rate and CO 2 consumption associated with CCW in karst watersheds. The contribution of SCW to riverine DIC in karst watersheds should not be ignored.…”

Section: Chemical Weathering Of Silicatesmentioning

confidence: 99%

“…In addition, it is inevitable that agricultural activities, scattered near the main tributaries, will also influence the chemical composition of the LR. , which is affected by severe acid precipitation [26], but much less than those of the upper reaches in the Wujiang River (590 and 200 µmol•L −1 ), which is drained in the Guizhou karst plateau and is significantly influenced by industrial activities and acid rain [53]. The ratio between SO (average value is 0.68) (Figure 4), therefore, SO 4 2− and NO 3 − in the river water are largely due to acid precipitation, and this phenomenon is consistent with the fact that the LRB is located in a severe acid rain area in East Asia (Figure 1).…”

Section: Human Activitiesmentioning

confidence: 99%

“…the Wujiang River (590 and 200 μmol•L −1 ), which is drained in the Guizhou karst plateau and is significantly influenced by industrial activities and acid rain [53]. The ratio between SO 4 2− /Ca 2+ and NO 3 − /Ca 2+ is generally used to determine the anthropogenic sources of SO 4 2− and NO 3 − .…”

Section: Human Activitiesmentioning

confidence: 99%

“…Carbonic acid, nitric acid and sulfuric acid were involved in CCW in the LRB. To estimate the relative contribution to riverine DIC of CCW induced by nitric and sulfuric acid, we assumed that k 1 (mol) carbonic acid, k 2 (mol) nitric acid and k 3 (mol) sulfuric acid were involved in the CCW process, rewriting Equation 3as [53,74]:…”

Section: Co 2 Consumption Deficit Related With Anthropogenic Acid-invmentioning

confidence: 99%

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Chemical Weathering and Riverine Carbonate System Driven by Human Activities in a Subtropical Karst Basin, South China

Lyu

Zuyi

Gao

et al. 2018

Water

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In the context of climate change, the input of acid substances into rivers, caused by human activities in the process of industrial and agricultural development, has significantly disrupted river systems and has had a profound impact on the carbon cycle. The hydrochemical composition and which main sources of the Lianjiang River (LR), a subtropical karst river in northern Guangdong Province, South China, were analyzed in January 2018. The objective was to explicate the influence on the deficit proportion of CO2 consumption, resulting from carbonate chemical weathering (CCW), driven by nitric acid (HNO3) and sulfuric acid (H2SO4), which is affected by exogenous acids from the industrial regions in north of the Nanling Mountains and the Pearl River Delta. The response of the riverine carbonate system to exogenous acid-related weathering was also discussed. HCO3− and Ca2+, respectively, accounted for 84.97% of the total anions and 78.71% of the total cations in the surface runoff of the LR, which was characterized as typical karst water. CCW was the most important material source of river dissolved loads in the LR, followed by human activities and silicate chemical weathering (SCW). Dissolved inorganic carbon (DIC), derived from CCW induced by carbonic acid (H2CO3), had the largest contribution to the total amount of DIC in the LR (76.79%), and those from CCW induced by anthropogenic acids (HNO3 and H2SO4) and SCW contributed 13.56% and 9.64% to the total DIC, respectively. The deficit proportion of CO2 consumption associated with CCW resulting from sulfuric acid and nitric acid (13.56%), was slightly lower than that of the Guizhou Plateau in rainy and pre-rainy seasons (15.67% and 14.17%, respectively). The deficit percentage of CO2 uptake associated with CCW induced by sulfuric acid and nitric acid, accounted for 38.44% of the total CO2 consumption related to natural CCW and 18.84% of the anthropogenic acids from external areas. DIC derived from CCW induced by human activities, had a significant positive correlation with the total alkalinity, SIc and pCO2 in river water, indicating that the carbonate system of the LR was also driven by exogenous acids, with the exception of carbonic acid. More attention should be paid to the effects of human activities on the chemical weathering and riverine carbonate system in the karst drainage basin.

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Section: Chemical Weathering Of Silicatesmentioning

confidence: 99%

Section: Human Activitiesmentioning

confidence: 99%

Section: Human Activitiesmentioning

confidence: 99%

Section: Co 2 Consumption Deficit Related With Anthropogenic Acid-invmentioning

confidence: 99%

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Chemical Weathering and Riverine Carbonate System Driven by Human Activities in a Subtropical Karst Basin, South China

Lyu

Zuyi

Gao

et al. 2018

Water

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“…Streams indicate critical zone (CZ) function, because they represent an integrated signal of watershed processes (Frisbee et al, 2011) including internal stream processes (Mulholland and Hill, 1997;Dawson et al, 2001) and processes occurring at the interfaces (i.e., riparian or hyporheic zones) (Bishop et al, 2004;Winterdahl et al, 2011). For example, the effects of acid deposition, especially prevalent in the northeastern United States (Likens et al, 1972), have been monitored using stream water observations (Newell and Skjelkvåle, 1997;Amiotte-Suchet et al, 1999;Huang et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Does Stream Water Composition at Sleepers River in Vermont Reflect Dynamic Changes in Soils During Recovery From Acidification?

et al. 2019

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Stream water pH and composition are widely used to monitor ongoing recovery from the deposition of strong anthropogenic acids in many forested headwater catchments in the northeastern United States. However, stream water composition is a function of highly complex and coupled processes, flowpaths, and variations in soil and bedrock composition. Spatial heterogeneity is especially pronounced in headwater catchments with steep topography, potentially limiting stream water composition as an indicator of changes in critical zone (CZ) dynamics during system recovery. To investigate the link between catchment characteristics, landscape position, and stream water composition we used long-term data from the Sleepers River Research Watershed (SRRW) in northeastern Vermont. We investigated trends with time in stream water and trends with time, depth, and landscape position (upslope, midslope, and riparian zone) in groundwater (GW) and soil solution. We further determined soil elemental composition and mineralogy on archived (1996) and modern (2017) soil samples to assess changes in composition with time. SRRW is inherently well-buffered by calcite in bedrock and till, but soils had become acidified and are now recovering from acidification. Although base cations, especially Ca, decrease progressively with time in GW, riparian soils have become more enriched in Ca, due to a mixture of lateral and vertical transfers. At the same time stream water Ca fluxes increased over the past two decades, likely due to the leaching of (transient) legacy Ca from riparian zones and increased water fluxes. The stream water response therefore reflects the dynamic changes in soil chemistry, flow routing and water inputs.

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Detrital carbonate minerals in Earth's element cycles

Müller

Börker

Sluijs

et al. 2022

Preprint

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Impact of sulfuric and nitric acids on carbonate dissolution, and the associated deficit of CO 2 uptake in the upper–middle reaches of the Wujiang River, China

Cited by 41 publications

References 35 publications

Chemical Weathering and Riverine Carbonate System Driven by Human Activities in a Subtropical Karst Basin, South China

Chemical Weathering and Riverine Carbonate System Driven by Human Activities in a Subtropical Karst Basin, South China

Does Stream Water Composition at Sleepers River in Vermont Reflect Dynamic Changes in Soils During Recovery From Acidification?

Detrital carbonate minerals in Earth's element cycles

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