全球大规模植被对每日降雨变化的敏感性
Andrew F Feldman1,2, Alexandra G Konings3, Pierre Gentine4
1Biospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA. andrew.feldman@nasa.gov.
Nature
|December 11, 2024
概括
全球植物的光合作用对每日降雨模式敏感, 不仅仅是总量. 降雨频率和强度的变化对植物生长和碳循环产生重大影响.
科学领域:
- 气候科学
- 生态学
- 遥感技术
背景情况:
- 全球气候变化正在改变降雨模式,
- 尽管每年降雨总量稳定,但每日降雨变量的这些变化对陆地植被光合作用和生长的影响仍然很不确定.
研究的目的:
- 调查全球植被光合作用和生长对每日降雨量变化的敏感性,独立于年度降雨量.
- 量化植被对每日降雨频率和强度变化的程度和程度.
主要方法:
- 使用卫星植被指数 (例如,NDVI,EVI) 作为光合作用和生长的代理.
- 综合现场观测以验证卫星数据.
- 分析了全球植被土地表面每日降雨量 (频率,强度) 和植被指数之间的关系.
主要成果:
- 全球一年级植被指数对每日降雨频率和强度具有显著的敏感性,不论年降雨总量如何.
- 大约42%的植被土地表现出对每日降雨变化的敏感性.
- 每天降雨的变化对植被的影响几乎与年降雨总量的影响一样大.
结论:
- 每天降雨的变化是影响全球植物光合作用和生长的关键因素.
- 预计雨天频率和强度的变化反映了年降雨量,这表明未来的影响很大.
- 这些发现对了解全球碳循环和在不断变化的气候条件下确保粮食安全具有重要意义.
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