黄河中游水化学的季节和年际变化

IF 6.3 1区 地球科学 Q1 ENGINEERING, CIVIL
Ningpan Chai , Guorui Lv , Jun Xiao , Li Deng , Zhangdong Jin
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引用次数: 0

摘要

中国黄土高原是一个受气候变化影响较大的巨大碳库。然而,化学风化过程的季节和年际变化及其对极端天气事件的响应仍然知之甚少。2014 - 2016年,黄河中游潼关水文站每周采集水样。结合离子比、正演模型、化学风化速率估算、净碳收支计算和相关性分析等多种方法,对当代风化过程进行了研究。最高研究区河水呈弱碱性,溶质主要为蒸发岩溶蚀(55 ± 0.5 %)和碳酸盐风化(33 ± 0.5 %),降水和人为输入有限。在季风季节,蒸发岩溶蚀对河流溶质的贡献较大,碳酸盐风化则相反,硅酸盐风化的季节变化较小。从年际变化来看,蒸发岩溶蚀贡献从2014年(52 %)增加到2016年(57 %),碳酸盐风化贡献从2014年(35 %)减少到2016年(31 %),硅酸盐风化贡献减少(6 %)。在最高产量研究区,物理侵蚀速率(1-7180 t/km2/yr)变化较大,在季风季节值较高。化学风化的CO2净消耗预算从2014年的4.9 × 1010 mol/yr逐渐下降到2015年的3.8 × 1010 mol/yr, 2016年进一步下降到3.2 × 1010 mol/yr。风暴事件引发了沉积物的快速动员,2016年的两次事件占年通量的60% %。风暴事件也大大增加了净碳消耗预算,贡献了6-9 %的年总量。自2001年以来,径流增加导致化学风化速率持续上升。这些结果表明,化学风化具有较强的年际变异性,风暴事件对化学风化通量有显著影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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.
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来源期刊
Journal of Hydrology
Journal of Hydrology 地学-地球科学综合
CiteScore
11.00
自引率
12.50%
发文量
1309
审稿时长
7.5 months
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.
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