高海拔流域是全球气候变暖背景下地球系统演变的重要前哨。该研究基于青藏高原黄河源区唐乃亥水文站2002—2019年间的径流量序列与水化学数据重建了该时期的化学风化过程, 探讨了气候变化下青藏高原黄河源区化学风化特征。2002—2019年, 黄河源区温度明显上升, 降水量和径流量出现增长; 年度化学风化速率在30.9~78 t·km-2之间, 平均值为53.2 t·km-2, 是全球平均化学风化速率的2倍以上。黄河源区年度化学风化速率随流域温度的上升呈现增加的趋势, 平均每年增加1.13 t·km-2。在全球气候变暖背景下, 青藏高原高海拔流域在陆地与海洋之间的物质交换和平衡大气CO2浓度中均发挥着重要作用。
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