Yincai Xie , Peng Qian , Jun Li , Shi Yu , Xiongyi Miao , Yongli Guo , Fen Huang , Qiong Xiao , Liankai Zhang
{"title":"不同岩性流域风化碳汇效应对人为硫酸的响应:中国西南地区的案例研究","authors":"Yincai Xie , Peng Qian , Jun Li , Shi Yu , Xiongyi Miao , Yongli Guo , Fen Huang , Qiong Xiao , Liankai Zhang","doi":"10.1016/j.jseaes.2024.106195","DOIUrl":null,"url":null,"abstract":"<div><p>Accurately quantifying the carbon sink effect resulting from chemical weathering caused by anthropogenic H<sub>2</sub>SO<sub>4</sub> is imperative to improve the assessment of the global carbon budget. Nevertheless, there is still a lack of precise understanding regarding the impact of anthropogenic H<sub>2</sub>SO<sub>4</sub> on CO<sub>2</sub> consumption during chemical weathering. Here, spring water samples were collected monthly from three catchments with distinct bedrock lithologies affected by severe acid precipitation in Southwest China for analyses of hydrogeochemistry and δ<sup>13</sup>C<sub>DIC</sub> to quantitatively estimate the effect of anthropogenic H<sub>2</sub>SO<sub>4</sub> on the weathering carbon sink budget. The results show that carbonates contribute 97.4 %, 95.0 % and 88.8 % of the total cationic load using a straightforward method in the Beidiping carbonate catchment, as well as in the Shegengyan and Bianyan silicate catchments, respectively. The [Ca<sup>2+</sup>+Mg<sup>2+</sup>]/[HCO<sub>3</sub><sup>−</sup>] (0.98–1.19) and [Ca<sup>2+</sup>+Mg<sup>2+</sup>]/[HCO<sub>3</sub><sup>−</sup>+SO<sub>4</sub><sup>2−</sup>] (approximately 1) equivalent ratios, and δ<sup>13</sup>C<sub>DIC</sub> values (−16.8 to −8.0 ‰) of the samples suggest that besides H<sub>2</sub>CO<sub>3</sub>, H<sub>2</sub>SO<sub>4</sub> is involved in carbonate weathering. The stoichiometry of the chemical compositions of spring water indicates that the presence of H<sub>2</sub>SO<sub>4</sub> enhances carbonate weathering rates by 14.8 %, 8.1 % and 7.5 % while decreasing the CO<sub>2</sub> consumption by 8.2 %, 4.3 % and 4.0 % in Beidiping, Shegengyan and Bianyan, respectively. Thus the reduced proportion of karst carbon sink in the carbonate catchment is approximately 2 times that in the silicate catchment, suggesting that carbonate weathering in the karst catchment is more sensitive to acid precipitation. The impact of acid precipitation on rock weathering in the silicate catchment is constrained by the soil buffering effect. Our study highlights the important role of anthropogenic H<sub>2</sub>SO<sub>4</sub> in carbonate weathering, which should be critically evaluated in regional and global carbon cycles in future studies.</p></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":null,"pages":null},"PeriodicalIF":2.7000,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Response of weathering carbon sink effect to anthropogenic sulfuric acid in different lithological catchments: A case study from Southwest China\",\"authors\":\"Yincai Xie , Peng Qian , Jun Li , Shi Yu , Xiongyi Miao , Yongli Guo , Fen Huang , Qiong Xiao , Liankai Zhang\",\"doi\":\"10.1016/j.jseaes.2024.106195\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Accurately quantifying the carbon sink effect resulting from chemical weathering caused by anthropogenic H<sub>2</sub>SO<sub>4</sub> is imperative to improve the assessment of the global carbon budget. Nevertheless, there is still a lack of precise understanding regarding the impact of anthropogenic H<sub>2</sub>SO<sub>4</sub> on CO<sub>2</sub> consumption during chemical weathering. Here, spring water samples were collected monthly from three catchments with distinct bedrock lithologies affected by severe acid precipitation in Southwest China for analyses of hydrogeochemistry and δ<sup>13</sup>C<sub>DIC</sub> to quantitatively estimate the effect of anthropogenic H<sub>2</sub>SO<sub>4</sub> on the weathering carbon sink budget. The results show that carbonates contribute 97.4 %, 95.0 % and 88.8 % of the total cationic load using a straightforward method in the Beidiping carbonate catchment, as well as in the Shegengyan and Bianyan silicate catchments, respectively. The [Ca<sup>2+</sup>+Mg<sup>2+</sup>]/[HCO<sub>3</sub><sup>−</sup>] (0.98–1.19) and [Ca<sup>2+</sup>+Mg<sup>2+</sup>]/[HCO<sub>3</sub><sup>−</sup>+SO<sub>4</sub><sup>2−</sup>] (approximately 1) equivalent ratios, and δ<sup>13</sup>C<sub>DIC</sub> values (−16.8 to −8.0 ‰) of the samples suggest that besides H<sub>2</sub>CO<sub>3</sub>, H<sub>2</sub>SO<sub>4</sub> is involved in carbonate weathering. The stoichiometry of the chemical compositions of spring water indicates that the presence of H<sub>2</sub>SO<sub>4</sub> enhances carbonate weathering rates by 14.8 %, 8.1 % and 7.5 % while decreasing the CO<sub>2</sub> consumption by 8.2 %, 4.3 % and 4.0 % in Beidiping, Shegengyan and Bianyan, respectively. Thus the reduced proportion of karst carbon sink in the carbonate catchment is approximately 2 times that in the silicate catchment, suggesting that carbonate weathering in the karst catchment is more sensitive to acid precipitation. The impact of acid precipitation on rock weathering in the silicate catchment is constrained by the soil buffering effect. Our study highlights the important role of anthropogenic H<sub>2</sub>SO<sub>4</sub> in carbonate weathering, which should be critically evaluated in regional and global carbon cycles in future studies.</p></div>\",\"PeriodicalId\":50253,\"journal\":{\"name\":\"Journal of Asian Earth Sciences\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.7000,\"publicationDate\":\"2024-05-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Asian Earth Sciences\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1367912024001901\",\"RegionNum\":3,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Asian Earth Sciences","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1367912024001901","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
Response of weathering carbon sink effect to anthropogenic sulfuric acid in different lithological catchments: A case study from Southwest China
Accurately quantifying the carbon sink effect resulting from chemical weathering caused by anthropogenic H2SO4 is imperative to improve the assessment of the global carbon budget. Nevertheless, there is still a lack of precise understanding regarding the impact of anthropogenic H2SO4 on CO2 consumption during chemical weathering. Here, spring water samples were collected monthly from three catchments with distinct bedrock lithologies affected by severe acid precipitation in Southwest China for analyses of hydrogeochemistry and δ13CDIC to quantitatively estimate the effect of anthropogenic H2SO4 on the weathering carbon sink budget. The results show that carbonates contribute 97.4 %, 95.0 % and 88.8 % of the total cationic load using a straightforward method in the Beidiping carbonate catchment, as well as in the Shegengyan and Bianyan silicate catchments, respectively. The [Ca2++Mg2+]/[HCO3−] (0.98–1.19) and [Ca2++Mg2+]/[HCO3−+SO42−] (approximately 1) equivalent ratios, and δ13CDIC values (−16.8 to −8.0 ‰) of the samples suggest that besides H2CO3, H2SO4 is involved in carbonate weathering. The stoichiometry of the chemical compositions of spring water indicates that the presence of H2SO4 enhances carbonate weathering rates by 14.8 %, 8.1 % and 7.5 % while decreasing the CO2 consumption by 8.2 %, 4.3 % and 4.0 % in Beidiping, Shegengyan and Bianyan, respectively. Thus the reduced proportion of karst carbon sink in the carbonate catchment is approximately 2 times that in the silicate catchment, suggesting that carbonate weathering in the karst catchment is more sensitive to acid precipitation. The impact of acid precipitation on rock weathering in the silicate catchment is constrained by the soil buffering effect. Our study highlights the important role of anthropogenic H2SO4 in carbonate weathering, which should be critically evaluated in regional and global carbon cycles in future studies.
期刊介绍:
Journal of Asian Earth Sciences has an open access mirror journal Journal of Asian Earth Sciences: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review.
The Journal of Asian Earth Sciences is an international interdisciplinary journal devoted to all aspects of research related to the solid Earth Sciences of Asia. The Journal publishes high quality, peer-reviewed scientific papers on the regional geology, tectonics, geochemistry and geophysics of Asia. It will be devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be included. Papers must have international appeal and should present work of more than local significance.
The scope includes deep processes of the Asian continent and its adjacent oceans; seismology and earthquakes; orogeny, magmatism, metamorphism and volcanism; growth, deformation and destruction of the Asian crust; crust-mantle interaction; evolution of life (early life, biostratigraphy, biogeography and mass-extinction); fluids, fluxes and reservoirs of mineral and energy resources; surface processes (weathering, erosion, transport and deposition of sediments) and resulting geomorphology; and the response of the Earth to global climate change as viewed within the Asian continent and surrounding oceans.