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Seasonal and interannual changes of river chemistry in the source region of Yellow River, Tibetan Plateau
Applied Geochemistry ( IF 3.1 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.apgeochem.2020.104638
Xiangying Li , Yongjian Ding , Tianding Han , Mika Sillanpää , Zhefan Jing , Xiaoni You , Sha Liu , Chuanyang Yang , Congrong Yu , Guoyu Li

Abstract The seasonal and annual processes of river chemistry as well as chemical weathering and controlling factors were examined in the source region of Yellow River (SRYE) during 2013–2015. River discharge exhibited strong seasonality and was dominated by precipitation and/or groundwater. Sediment concentrations were positively related to discharge, and the dominant sediment-producing area was this area from JM to JG owing to large precipitation and strong erosion. The dominant cations and anions were Na+, Ca2+ and HCO3−, and concentrations of most ions displayed obvious seasonality with a negative relationship with discharge, suggesting a hydrological control on river chemistry. Comparison of ion concentrations suggest that the regional climate and land surface affect the soil/rock erosion and solute release. River chemistry was dominated by the weathering of carbonate and silicate. HCO3−, Ca2+ and Mg2+ were primarily derived from calcite and dolomite weathering, and Na+ and K+ mainly came from silicate weathering. CWR and CatWR showed strong seasonality and were closely related to discharge, air temperature, precipitation and PER, suggesting that chemical weathering rates are dominated by lithology, discharge and precipitation. The sediment and solute yields ranged from 25,110 to 97,270 t km−2a−1 and 22,610 to 27,800 t km−2a−1 respectively in the SRYE (at TNH), where CWR and CatWR were 5.42–7.63 t km−2a−1 and 1.20–2.62 t km−2a−1 respectively. Higher CatWR in the SRYE than those in other basins with higher specific discharge implies that silicate weathering is more sensitive to permafrost degradation.

中文翻译:

青藏高原黄河源区河流化学的季节和年际变化

摘要 研究了2013-2015年黄河源区河流化学的季节性和年度过程以及化学风化和控制因素。河流流量表现出很强的季节性,主要是降水和/或地下水。泥沙浓度与流量呈正相关,主要产沙区为JM至JG地区,降水量大,侵蚀强。主要阳离子和阴离子为Na+、Ca2+和HCO3-,大部分离子浓度呈现明显的季节性,与流量呈负相关,表明河流化学受水文控制。离子浓度的比较表明区域气候和地表影响土壤/岩石侵蚀和溶质释放。河流化学以碳酸盐和硅酸盐的风化作用为主。HCO3−、Ca2+和Mg2+主要来源于方解石和白云石风化,Na+和K+主要来源于硅酸盐风化。CWR和CatWR表现出较强的季节性,与流量、气温、降水和PER密切相关,表明化学风化速率受岩性、流量和降水的支配。在 SRYE(在 TNH)中,沉积物和溶质产量分别为 25,110 至 97,270 t km-2a-1 和 22,610 至 27,800 t km-2a-1,其中 CWR 和 CatWR 为 5.42-7.63 t km-2a-1 和分别为 1.20–2.62 t km-2a-1。SRYE 中的 CatWR 高于比流量更高的其他盆地,这意味着硅酸盐风化对永久冻土退化更敏感。Ca2+和Mg2+主要来源于方解石和白云石风化,Na+和K+主要来源于硅酸盐风化。CWR和CatWR表现出较强的季节性,与流量、气温、降水和PER密切相关,表明化学风化速率受岩性、流量和降水的支配。在 SRYE(在 TNH)中,沉积物和溶质产量分别为 25,110 至 97,270 t km-2a-1 和 22,610 至 27,800 t km-2a-1,其中 CWR 和 CatWR 为 5.42-7.63 t km-2a-1 和分别为 1.20–2.62 t km-2a-1。SRYE 中的 CatWR 高于比流量更高的其他盆地,这意味着硅酸盐风化对永久冻土退化更敏感。Ca2+和Mg2+主要来源于方解石和白云石风化,Na+和K+主要来源于硅酸盐风化。CWR和CatWR表现出较强的季节性,与流量、气温、降水和PER密切相关,表明化学风化速率受岩性、流量和降水的支配。在 SRYE(在 TNH)中,沉积物和溶质产量分别为 25,110 至 97,270 t km-2a-1 和 22,610 至 27,800 t km-2a-1,其中 CWR 和 CatWR 为 5.42-7.63 t km-2a-1 和分别为 1.20–2.62 t km-2a-1。SRYE 中的 CatWR 高于比流量更高的其他盆地,这意味着硅酸盐风化对永久冻土退化更敏感。CWR和CatWR表现出较强的季节性,与流量、气温、降水和PER密切相关,表明化学风化速率受岩性、流量和降水的支配。在 SRYE(在 TNH)中,沉积物和溶质产量分别为 25,110 至 97,270 t km-2a-1 和 22,610 至 27,800 t km-2a-1,其中 CWR 和 CatWR 为 5.42-7.63 t km-2a-1 和分别为 1.20–2.62 t km-2a-1。SRYE 中的 CatWR 高于比流量更高的其他盆地,这意味着硅酸盐风化对永久冻土退化更敏感。CWR和CatWR表现出较强的季节性,与流量、气温、降水和PER密切相关,表明化学风化速率受岩性、流量和降水的支配。在 SRYE(在 TNH)中,沉积物和溶质产量分别为 25,110 至 97,270 t km-2a-1 和 22,610 至 27,800 t km-2a-1,其中 CWR 和 CatWR 为 5.42-7.63 t km-2a-1 和分别为 1.20–2.62 t km-2a-1。SRYE 中的 CatWR 高于比流量更高的其他盆地,这意味着硅酸盐风化对永久冻土退化更敏感。SRYE(在 TNH)分别为 110 至 97,270 t km-2a-1 和 22,610 至 27,800 t km-2a-1,其中 CWR 和 CatWR 分别为 5.42-7.63 t km-2a-1 和 1.20-2.62 t km-2-1 -1 分别。SRYE 中的 CatWR 高于比流量更高的其他盆地,这意味着硅酸盐风化对永久冻土退化更敏感。SRYE(在 TNH)分别为 110 至 97,270 t km-2a-1 和 22,610 至 27,800 t km-2a-1,其中 CWR 和 CatWR 分别为 5.42-7.63 t km-2a-1 和 1.20-2.62 t km-2-1 -1 分别。SRYE 中的 CatWR 高于比流量更高的其他盆地,这意味着硅酸盐风化对永久冻土退化更敏感。
更新日期:2020-08-01
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