最近的甲激增显示,热带洪水地区的排放量增加
Xin Lin1, Shushi Peng2, Philippe Ciais3,4
1Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, France. xinlin.res@gmail.com.
Nature communications
|December 31, 2024
概括
2020-2021年,大气中甲的创纪录增长激增,主要是由热带和北极地区的洪水带来的. 目前的模型低估了这些甲排放,强调了需要更好的湿地数据.
科学领域:
- 大气化学和气候科学.
背景情况:
- 大气中的甲 (CH4) 度在2020年和2021年表现出前所未有的增长率.
- 这些升高的水平是自20世纪80年代初以来观察到的最高水平,促使对排放源进行调查.
研究的目的:
- 与2019年相比,量化2020年和2021年的全球甲排放变化.
- 确定导致观察到的甲激增的主要地理区域.
主要方法:
- 使用了一组大气逆转.
- 结合了地面和卫星基的甲观测.
- 将排放估计与基于过程的湿地模型进行比较.
主要成果:
- 全球甲排放量在2020年 (+20.3±9.9 Tg/年) 和2021年 (+24.8±3.1 Tg/年) 显著增加.
- 增加的排放主要来自于热带和北极地区的淹水地区.
- 逆转衍生排放与当前湿地模型之间发现了差异,特别是在热带地区.
结论:
- 热带被洪水淹没的地区在近期大气甲激增中发挥着关键作用.
- 现有的湿地模型需要在表示湿地范围和甲排放方面进行改进.
- 整合各种数据流和建模方法对于准确的热带湿地排放评估至关重要.
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