干旱减少了沿海湾的气供应和N2O排放
Mingzhen Zhang1, Dan Yu2, Yiqi Yu1
1State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, China; Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, College of the Environment and Ecology, Xiamen University, Xiamen, China.
Water research
|September 15, 2024
概括
严重的干旱通过改变供应和陆海运输,显著减少了沿海的和氧化 (N2O) 排放. 这影响了气循环和门湾等海湾的温室气体排放.
科学领域:
- 环境科学 环境科学
- 沿海生态 沿海生态
- 气候变化研究 气候变化研究
背景情况:
- 全球气候变化正在增加严重干旱的频率,影响流域水文和沿海循环.
- 干旱对气运输和沿海气动态的确切影响需要进一步研究.
研究的目的:
- 评估2020-2022年干旱对中国东南部门湾的气供应和氧化物 (N2O) 排放的影响.
- 了解干旱条件下导致度和N2O排放变化的机制.
主要方法:
- 在干旱期间 (2019-2022) 之前和期间,对气度 (NH4N,NO2N,NO3N) 和门湾N2O排放的分析.
- 评估地表排水,潜在蒸发透气 (PET) 和河流排放对动态的影响.
- 对对PET的度反应和门湾,桑沙湾和切萨皮克湾的河流排放的比较分析.
主要成果:
- 干旱导致门湾每年NH4N,NO2N和NO3N度显著下降 (分别为49.4%,32.1%,40.3%).
- 降低地表排水是较低NH4N的主要驱动因素,而增加的PET和土地脱影响了NO3N和NO2N.
- 在干旱期间,门湾的年度N2O排放量减少了40.0%72.7%,与减少的酸盐和溶解的无机 (DIN) 密切相关.
结论:
- 干旱大大减少了沿海的N2O排放,主要是由于酸盐供应减少.
- 干旱对动态的影响有所不同,NO3N在研究的海湾中显示出与PET的一致的负面关系.
- 研究结果为预测未来气候变化情景下的沿海气循环和温室气体排放提供了关键的见解.
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