当地河流对沿海酸化的影响
Allison M Savoie1,2, Amy Moody2, Melissa Gilbert2
1Department of Oceanography Texas A&M University College Station Texas.
概括
当地河流和密西西比河的转移影响密西西比海峡的沿海酸化. 由于气候变化导致的淡水排放量的增加,降低了盐度,溶解氧和阿拉戈尼特和状态,损害了生态系统.
科学领域:
- 海洋化学 海洋化学
- 沿海生态 沿海生态
- 海洋酸化研究的研究.
背景情况:
- 沿海生态系统对于碳循环至关重要,但容易受到海洋酸化的影响.
- 密西西比海峡受当地河流的影响,以及密西西比河通过Bonnet Carré Spillway的淡水输入.
- 了解这些淡水输入对于评估沿海酸化影响至关重要.
研究的目的:
- 调查当地河流和密西西比河转移对密西西比海峡溶解无机碳 (DIC) 和总度 (TA) 的影响.
- 评估这些淡水输入对沿海酸化动态的影响,特别是阿拉贡石和度 (Ωar).
- 了解改变水文的后果对沿海生态系统的弹性.
主要方法:
- 从2018年8月到2019年11月,每月和每周在密西西比海峡取水样.
- 溶解无机碳 (DIC) 和总度 (TA) 的分析,以确定碳酸盐的化学成分.
- 监测环境参数,包括盐度,溶解氧和阿拉贡石和度 (Ωar).
主要成果:
- 在2019年溢流开放之前,度低的河流可能增加了冬季对酸化的易感性 (Ω ar < 2).
- 尽管溢出口开放后TA增加,但Ωar由于低氧和地下水中的CO2升高而保持在低水平.
- 密西西比河的输入量增加正在改变海峡的水文结构,可能成为一个新的季节性常态.
结论:
- 与气候变化相关的淡水排放增加,正在改变密西西比湾的化学成分,影响生态系统的健康.
- 盐度,溶解氧和Ωar的下降威胁种群和生态系统对酸化的弹性.
- 这些发现突显了沿海系统对气候驱动的淡水输入和酸化变化的脆弱性.
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