植被诱导的不对称昼间陆地表面温度在全球气候区的变化
Lingxue Yu1, Ye Liu2, Xuan Li1
1Remote Sensing and Geographic Information Research Center, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.
The Science of the total environment
|July 3, 2023
概括
全球植被绿化导致陆地表面温度 (LST) 不对称地升温,夜间LST比白天LST增加更多. 这导致白天LST范围的下降,主要是由于空气温度上升和植被变化.
科学领域:
- 环境科学 环境科学
- 气候科学 气候科学
- 遥感 遥感 遥感 遥感
背景情况:
- 全球植被变绿是一个已知的影响陆地表面温度 (LST) 的现象.
- 植被覆盖的变化对不同气候区的日间LST的影响仍然不太清楚.
- 以前的研究还没有完全阐明不对称的LST变化的驱动因素.
研究的目的:
- 在全球范围内调查长期生长季节白天和夜晚的LST变化.
- 探索导致LST变化的主要因素,包括植被 (LAI) 和气候因素 (空气温度,降水,太阳辐射).
- 了解植被覆盖变化的影响在全球气候区的昼间LST范围 (DLSTR).
主要方法:
- 利用了从2003年到2020年的全球气候时间序列数据集.
- 分析了生长季节白天和夜晚的LST趋势.
- 进行了灵敏度分析,以确定LAI,空气温度,降水和太阳辐射对LST的影响.
主要成果:
- 观察到的不对称变暖:全球白天LST的0.16 °C/10a和夜间LST的0.30 °C/10a.
- 白天LST范围 (DLSTR) 在0.14°C/10a下降.
- 空气温度上升是导致LST变暖的主要原因;增加的LAI降温了白天的LST,但加热了夜间的LST,导致DLSTR下降.
结论:
- 空气温度上升显著导致白天和夜晚的LST变暖.
- 增加植被覆盖 (LAI) 有复杂的影响,冷却白天的LST,同时温暖夜间的LST,导致DLSTR减少.
- 这些发现突出了气候区间对植被变化的多样化的生物物理反应,这对于改善气候模型至关重要.
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