在过去的四十年里,第三极的气溶污染逐渐增加:对区域气候变化的影响
B R Sharma1, J Kuttippurath2, V K Patel2
1CORAL, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India; Department of Physics, Prithvinarayan Campus, Tribhuvan University, Pokhara, Nepal.
Environmental research
|September 9, 2023
概括
气溶光学深度 (AOD) 从1980年到2020年在第三极 (TP) 增加,由尘埃和碳气溶驱动. 这种黑碳 (BC) 和辐射强迫 (RF) 的增加可能会加速冰川融化并影响水安全.
科学领域:
- 大气科学 大气科学
- 气候科学 气候科学
- 环境科学 环境科学
背景情况:
- 第三极 (TP) 地区对气候变化很敏感,冰川质量很大.
- 气溶在区域气候和冰层过程中起着至关重要的作用.
研究的目的:
- 分析长期的气溶变化 (1980-2020年) 在TP.
- 评估由此产生的辐射强迫 (RF) 变化.
- 了解对区域变暖和冰川融化的影响.
主要方法:
- 分析卫星,地面和再分析数据,以测量气溶光学深度 (AOD).
- 轨迹分析以确定气溶来源.
- 评估辐射强迫 (RF) 趋势.
主要成果:
- 年平均AOD范围从0.06到0.24,以北和西南的尘埃占主导地位,在南和东的有机碳 (OC),黑碳 (BC) 和硫酸盐.
- 显著的积极的AOD趋势 (约. 0.002 /年) 观察到,特别是在东部和南部的TP.
- BC和OC度显著增加,特别是在2000年之后.
- 辐射强迫 (RF) 范围从-10到2W/m2,在山区具有正射频.
- 在过去的几十年 (2001-2020年) 中,与早期时期 (1981-2000年) 相比,RF的增长有所增加.
结论:
- 增加的BC和尘埃度与TP的射频增加有关.
- 在BC的积极趋势和相关的射频变化可以放大区域变暖和加速冰川融化.
- 这些变化对南亚国家的水安全造成了重大关注.
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