通过植被相互作用增强萨赫勒地区的十年间气候变化
1Department of Atmospheric Sciences and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1565, USA. NASA-Goddard Space Flight Center, Greenbelt, MD, 20771, USA.
概括
自然变化的植被显著影响西非萨赫勒地区的气候变化. 陆地表面的反会放大降雨波动,植被在长期趋势和季节性变化中起着关键作用.
科学领域:
- 气候科学 气候科学
- 大气科学 大气科学
- 生态生态学 生态生态学
背景情况:
- 萨赫勒地区的降雨变化受海洋海面温度的影响.
- 陆地表面相互作用在气候变化中的作用至关重要.
- 植被动态与区域气候模式密切相关.
研究的目的:
- 调查自然植被变化的影响西非萨赫勒地区气候变化.
- 分析陆地表面反对不同时间尺度的降雨变异性的影响.
- 了解植被影响年间和十年间气候模式的机制.
主要方法:
- 使用了一种合的大气-陆地-植被模型.
- 在自然变化的植被条件下模拟气候变化.
- 分析了海面温度变化对萨赫勒地区降雨的影响.
主要成果:
- 陆地表面反放大了萨赫勒地区的年间和十年间降雨变化.
- 交互式植被大大增强了十年间的变化.
- 植被的缓慢调整时间可以减少由于相位延迟而导致的年比年变化.
- 观察到的植被变化与降雨模式相关,包括20世纪50年代至80年代的干旱趋势.
结论:
- 自然变化的植被是西非萨赫勒地区气候变化的重要驱动因素.
- 陆地表面和植被反在调节多个时间尺度上的降雨模式方面发挥着至关重要的作用.
- 必须考虑植被动态来准确地建模气候和了解区域气候变化.
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