当地吸收气溶在调节印度夏季季风暴降雨中的作用
1School of Earth, Ocean, and Climate Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar, Odisha 752 050, India; National Center for Atmospheric Research, Boulder, CO 80301, USA.
The Science of the total environment
|November 19, 2023
概括
自然和人为吸收气溶,如尘埃和碳气溶,显著减少印度季风降雨. 这项研究量化了这些影响,这些影响对于了解气候和水循环至关重要.
科学领域:
- 气候科学 气候科学
- 大气化学 大气化学
- 季风的动力学 季风的动力学
背景情况:
- 吸收气溶对印度季风系统的影响是复杂的,需要进一步的科学研究.
- 吸收气溶,包括自然尘埃和人为碳酸气溶,在调节区域气候模式方面发挥着重要作用.
研究的目的:
- 利用区域气候模型调查自然 (尘埃) 和人为 (碳) 吸收气溶对印度季风降水的影响.
- 量化不同类型的气溶造成的季风降雨减少,并了解潜在的机制.
主要方法:
- 使用化学合区域气候模型 (RegCM 4.5) 与理想化的实验.
- 分析了季风降水,陆海压力梯度,低热层水分和近地表风流动的变化.
主要成果:
- 发现尘埃和碳酸气溶都能在季节性时间尺度上减少季风降雨.
- 尘埃气溶导致印度中部和印度-河平原的平均夏季降雨量每天下降1毫米以上.
- 气溶迫使明显改变了近地表面的风力循环,使季风谷以灰尘减弱,并通过碳酸气溶影响水分来源.
结论:
- 吸收气溶显著影响印度季风系统,影响降雨模式和大气循环.
- 了解气溶引起的水循环变化对于区域气候变化评估和告知排放管理政策至关重要.
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