有限证据表明,热带洪水和降雨为2020-2022年甲激增提供了动力
Ying Xiong1, Eric A Kort1, A Anthony Bloom2
1Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI USA.
概括
热带湿地表现出大量的甲排放变化,但最近大气甲的增长与它们无关. 这表明其他因素推动了增长,而不是湿地动态.
科学领域:
- 地球和环境科学 地球和环境科学
- 气候科学 气候科学
- 大气化学 大气化学
背景情况:
- 大气中的甲正在迅速增加,引发了人们对气候反的影响的担忧.
- 热带湿地是重要的甲来源,但它们的动态不确定.
- 了解湿地甲排放对于减缓气候变化至关重要.
研究的目的:
- 使用高分辨率卫星数据绘制热带湿地洪水动态图.
- 评估热带湿地对近期大气甲增加的贡献.
- 调查潜在的气候-湿地-甲反机制.
主要方法:
- 利用气旋全球导航卫星系统 (CYGNSS) 观测,为2018-2023年在热带地区 (37.4°南至37.4°北) 进行高分辨率 (0.01°×0.01°) 每月洪水映射.
- 将云层和植被覆盖的地区纳入洪水分析.
- 带动热带湿地模型与卫星洪水数据,降水产品和总水观测.
主要成果:
- 揭示了热带湿地面积的季节性和跨年变化,超过了传统的洪水产品分辨率.
- 观察到湿地动态与厄尔尼诺-南方振荡 (ENSO) 事件之间存在强烈的相关性.
- 热带湿地模型没有显示2020-2022年甲排放的增长,无论输入数据如何.
结论:
- 大气甲的近期增长不太可能是由热带湿地排放驱动的.
- 替代的甲来源或下水槽,或对湿地排放的非水文控制可能比目前理解的更为重要.
- 高分辨率卫星数据为湿地动态及其在全球甲预算中的作用提供了关键的见解.
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