影响弗吉尼亚州山脉溪流季节性化学模式的因素
Ami L Riscassi1, Todd M Scanlon1, James N Galloway1
1Environmental Sciences Department, University of Virginia, Charlottesville, VA USA.
概括
温度和生物活动的季节性变化显著影响流化学,影响酸中和能力和基离子度. 这些发现对于了解气候变化中的流溶液模式至关重要.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 水文学的水文学
背景情况:
- 河流化学受水文流和季节性生物/地化学活动的影响,这些活动往往会发生变化.
- 温度系统在夏季 (低流量,高温,高活动) 和冬季 (高流量,低温度,低活动) 呈现不同的条件.
- 解开这些对流化学模式的影响是具有挑战性的,因为它们的相互依赖.
研究的目的:
- 通过比较分析剂度和流量来研究季节性流化学模式的控制.
- 为了区分流量变化的影响与季节性生物/地化学活动.
- 提供关于不同地质环境中的水生地化学过程的见解.
主要方法:
- 用两个常规水年和一个逆流年 (2018年) 的数据比较每月的酸相关分析剂度与流量.
- 分析了来自两个具有对比地质的阿巴拉契亚中部地区的数据 (mafic vs. siliciclastic).
- 检查了冬季和夏季季节之间的关系.
主要成果:
- 酸中和能力 (ANC) 在较低的流量和夏季增加,从高流量冬季翻一番到低流量夏季条件.
- 基离子度跟踪了在地图地点的ANC,季节性差异 (72%) 比流量变化更有影响.
- 硫酸盐度随着更高的流量和在冬季在地图地点增加,季节和流量贡献是相似的.
结论:
- 温度和生物活动的季节性变化 (生长季节和休眠季节) 是年度内流溶液模式的重要驱动因素.
- 夏季土壤呼吸率升高可能会增加自然酸化,岩基气候变化和硫酸盐吸附.
- 这些发现对于气候变化下的河流化学的水力生物地质化学模型的参数化至关重要.
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