低估了干旱季的甲排放量从湿地在Pantanal的低估
Mengze Li1,2, Eric A Kort1, A Anthony Bloom3
1Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.
Environmental science & technology
|February 7, 2024
概括
热带湿地会产生大量的甲 (CH4). 这项研究揭示了南美潘坦纳尔的干旱季CH4排放量高于预期,利用卫星数据改进气候模型.
科学领域:
- 环境科学 环境科学
- 大气科学 大气科学
- 遥感 遥感 遥感 遥感
背景情况:
- 热带湿地是全球甲 (CH4) 排放的主要来源,约占30%.
- 由于观测数据有限,这些地区现有的CH4排放估计存在重大不确定性.
- 准确的CH4排放数据对于气候建模和了解全球碳预算至关重要.
研究的目的:
- 为了调查干旱季的甲排放来自南美洲的潘坦纳尔地区的热带湿地.
- 通过结合新的数据来源,改善湿地CH4排放在气候模型中的表现.
- 建立独立于洪水地图选择的CH4排放观测约束.
主要方法:
- 综合遥感数据 (包括气旋全球导航卫星系统 (CYGNSS)) 与大气和湿地模型.
- 使用多个洪水地图生成了一组湿地CH4排放场景.
- 在5月至7月期间,与每日卫星观测相对应的验证模型输出.
主要成果:
- 根据CYGNSS的洪水数据显示,5月份甲排放量较高,与卫星观测数据更加一致.
- 经验限制显示,干旱季节湿地CH4排放量很大 (31.7±13.6和32.0±20.2毫克CH4/m2/day在2018/2019年5月和6月/7月).
- 观察到的排放量是当前模型模拟的2-3倍,这表明低估了年度湿地排放量.
结论:
- 潘坦纳尔干旱季的甲排放量明显高于此前的估计.
- 早期干旱季节的动态在热带湿地甲排放中发挥着关键作用.
- 改进卫星数据集成对于减少全球甲预算的不确定性至关重要.
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