气溶加热了喜马拉雅气候
S Ramachandran1, Maheswar Rupakheti2, Ribu Cherian3
1Physical Research Laboratory, Ahmedabad, India; Research Institute for Sustainability - Helmholtz Centre Potsdam, Potsdam, Germany.
The Science of the total environment
|June 16, 2023
概括
吸收气溶显著影响喜马拉雅气候,导致超过50%的气候变暖. 当前的气候模型低估了这种气溶引起的加热,强调了需要在气候评估中改善气溶的代表性.
科学领域:
- 大气科学 大气科学
- 气候变化研究 气候变化研究
- 环境科学 环境科学
背景情况:
- 气溶,特别是吸收类型,在气候系统中起着至关重要的作用,特别是在喜马拉雅山脉等敏感地区.
- 印度河平原 (IGP) 和西藏高原是研究不足的,但在全球范围内显著的生态系统易受气候变化的影响.
- 了解气溶的影响对于预测气候变化及其对冰川和水文学的影响至关重要.
研究的目的:
- 用地面观测,卫星数据和建模分析气溶特性和辐射强迫.
- 在喜马拉雅地区量化气溶辐射强迫效率 (ARFE) 和大气加热率.
- 评估当前气候模型在代表印度库什 - 喜马拉雅 - 西藏高原 (HKHTP) 地区的气溶影响方面的表现.
主要方法:
- 利用来自IGP,喜马拉雅山和西藏高原的多个地点的地面气溶观测.
- 综合卫星数据和先进的建模技术用于全面分析.
- 计算的气溶光学深度 (AOD),单次散射白度 (SSA) 和气溶辐射强迫效率 (ARFE).
主要成果:
- 气溶辐射强迫效率 (ARFE) 在IGP和喜马拉雅山脚下特别高 (80-135Wm-2/AOD),随着高度的增加而增加.
- 年平均气溶引起的大气加热率 (每天0.5-0.8K) 显著高于此前报告的水平.
- 气溶单独占该地区较低大气层和表面总变暖的50%以上.
结论:
- 气溶是喜马拉雅地区变暖的主要驱动因素,对冰川撤退和改变水文循环作出了重大贡献.
- 现有的气候模型大大低估了HKHTP的气溶引起的加热和变暖,需要改进模型.
- 对气溶,特别是黑碳的准确表示对于在这个脆弱地区可靠的气候预测至关重要.
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