Ningpan Chai , Guorui Lv , Jun Xiao , Li Deng , Zhangdong Jin
{"title":"黄河中游水化学的季节和年际变化","authors":"Ningpan Chai , Guorui Lv , Jun Xiao , Li Deng , Zhangdong Jin","doi":"10.1016/j.jhydrol.2025.133891","DOIUrl":null,"url":null,"abstract":"<div><div>The Chinese Loess Plateau is a huge carbon reservoir that is strongly influenced by climate change. However, the seasonal and interannual variations in chemical weathering processes and their responses to extreme weather events remain poorly understood. Weekly water samples were collected from 2014 to 2016 at the Tongguan hydrological station in the middle Yellow River (MYR). Multiple methods, including ion ratios, forward model, chemical weathering rate estimation, net carbon budget calculation, and correlation analysis, were coupled to investigate contemporary weathering processes. The river water of the MYR was weakly alkaline, with its riverine solutes primarily dominated by evaporite dissolution (55 ± 0.5%) and carbonate weathering (33 ± 0.5%), while precipitation and anthropogenic inputs were limited. Evaporite dissolution contributed more to riverine solutes during the monsoon season, whereas carbonate weathering showed the opposite trend, with minor seasonal variation of silicate weathering. For interannual variations, evaporite dissolution contribution increased from 2014 (52%) to 2016 (57%), while carbonate weathering decreased from 2014 (35%) to 2016 (31%), with less silicate weathering contribution (6%). In the MYR, the physical erosion rate (1–7180 t/km<sup>2</sup>/yr) varied greatly, with high values in the monsoon season. The net CO<sub>2</sub> consumption budget by chemical weathering gradually decreased from 4.9 × 10<sup>10</sup> mol/yr in 2014 to 3.9 × 10<sup>10</sup> mol/yr in 2015, and further declined to 3.3 × 10<sup>10</sup> mol/yr in 2016. Storm events triggered rapid sediment mobilization, with two events in 2016 accounting for 60% of annual flux. Storm events also substantially enhanced the net carbon consumption budget, contributing 6–9% of the total annual amount. Since 2001, increased runoff has led to a sustained rise in chemical weathering rates. These findings indicate that chemical weathering exhibits strong interannual variability and that storm events have a significant impact on chemical weathering flux.</div></div>","PeriodicalId":362,"journal":{"name":"Journal of Hydrology","volume":"662 ","pages":"Article 133891"},"PeriodicalIF":6.3000,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Seasonal and interannual variations of hydrochemistry in the middle Yellow River\",\"authors\":\"Ningpan Chai , Guorui Lv , Jun Xiao , Li Deng , Zhangdong Jin\",\"doi\":\"10.1016/j.jhydrol.2025.133891\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The Chinese Loess Plateau is a huge carbon reservoir that is strongly influenced by climate change. However, the seasonal and interannual variations in chemical weathering processes and their responses to extreme weather events remain poorly understood. Weekly water samples were collected from 2014 to 2016 at the Tongguan hydrological station in the middle Yellow River (MYR). Multiple methods, including ion ratios, forward model, chemical weathering rate estimation, net carbon budget calculation, and correlation analysis, were coupled to investigate contemporary weathering processes. The river water of the MYR was weakly alkaline, with its riverine solutes primarily dominated by evaporite dissolution (55 ± 0.5%) and carbonate weathering (33 ± 0.5%), while precipitation and anthropogenic inputs were limited. Evaporite dissolution contributed more to riverine solutes during the monsoon season, whereas carbonate weathering showed the opposite trend, with minor seasonal variation of silicate weathering. For interannual variations, evaporite dissolution contribution increased from 2014 (52%) to 2016 (57%), while carbonate weathering decreased from 2014 (35%) to 2016 (31%), with less silicate weathering contribution (6%). In the MYR, the physical erosion rate (1–7180 t/km<sup>2</sup>/yr) varied greatly, with high values in the monsoon season. The net CO<sub>2</sub> consumption budget by chemical weathering gradually decreased from 4.9 × 10<sup>10</sup> mol/yr in 2014 to 3.9 × 10<sup>10</sup> mol/yr in 2015, and further declined to 3.3 × 10<sup>10</sup> mol/yr in 2016. Storm events triggered rapid sediment mobilization, with two events in 2016 accounting for 60% of annual flux. Storm events also substantially enhanced the net carbon consumption budget, contributing 6–9% of the total annual amount. Since 2001, increased runoff has led to a sustained rise in chemical weathering rates. These findings indicate that chemical weathering exhibits strong interannual variability and that storm events have a significant impact on chemical weathering flux.</div></div>\",\"PeriodicalId\":362,\"journal\":{\"name\":\"Journal of Hydrology\",\"volume\":\"662 \",\"pages\":\"Article 133891\"},\"PeriodicalIF\":6.3000,\"publicationDate\":\"2025-07-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Hydrology\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0022169425012296\",\"RegionNum\":1,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, CIVIL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Hydrology","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022169425012296","RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}
Seasonal and interannual variations of hydrochemistry in the middle Yellow River
The Chinese Loess Plateau is a huge carbon reservoir that is strongly influenced by climate change. However, the seasonal and interannual variations in chemical weathering processes and their responses to extreme weather events remain poorly understood. Weekly water samples were collected from 2014 to 2016 at the Tongguan hydrological station in the middle Yellow River (MYR). Multiple methods, including ion ratios, forward model, chemical weathering rate estimation, net carbon budget calculation, and correlation analysis, were coupled to investigate contemporary weathering processes. The river water of the MYR was weakly alkaline, with its riverine solutes primarily dominated by evaporite dissolution (55 ± 0.5%) and carbonate weathering (33 ± 0.5%), while precipitation and anthropogenic inputs were limited. Evaporite dissolution contributed more to riverine solutes during the monsoon season, whereas carbonate weathering showed the opposite trend, with minor seasonal variation of silicate weathering. For interannual variations, evaporite dissolution contribution increased from 2014 (52%) to 2016 (57%), while carbonate weathering decreased from 2014 (35%) to 2016 (31%), with less silicate weathering contribution (6%). In the MYR, the physical erosion rate (1–7180 t/km2/yr) varied greatly, with high values in the monsoon season. The net CO2 consumption budget by chemical weathering gradually decreased from 4.9 × 1010 mol/yr in 2014 to 3.9 × 1010 mol/yr in 2015, and further declined to 3.3 × 1010 mol/yr in 2016. Storm events triggered rapid sediment mobilization, with two events in 2016 accounting for 60% of annual flux. Storm events also substantially enhanced the net carbon consumption budget, contributing 6–9% of the total annual amount. Since 2001, increased runoff has led to a sustained rise in chemical weathering rates. These findings indicate that chemical weathering exhibits strong interannual variability and that storm events have a significant impact on chemical weathering flux.
期刊介绍:
The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.