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南亚上空的水溶性有机气溶 - 季节性变化和来源特征

C B Ramya¹, A R Aswini¹, Prashant Hegde¹

¹Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, India.

The Science of the total environment

|July 26, 2023

概括

生物质燃烧排放大大促进了南亚气溶中的水溶性有机碳 (WSOC). 这些气溶的光化学老化和远程运输进一步提高了WSOC水平,影响了空气质量.

科学领域:

大气化学大气化学
气溶科学气溶科学
环境科学环境科学

背景情况:

水溶性有机碳 (WSOC) 是大气气溶的关键组成部分,由于其湿透性质,影响云形成.
了解WSOC的来源和变异性对于南亚的空气质量和气候建模至关重要.

研究的目的:

为了研究 WSOC 在南亚的质量度的时空变化.
确定WSOC的主要和次要来源,包括生物质燃烧的作用.
评估远程空气质运输对WSOC丰富性的影响.

主要方法:

分析WSOC质量度及其与有机碳 (OC) 和元素碳 (EC) 的关系.
使用像WSOC/OC和WSOC/SOC这样的比率来区分初级/二级贡献和老化过程.
研究了光化学衰老和远程运输对WSOC形成的影响.

主要成果:

来自生物质排放的初级有机气溶的光化学老化是南亚WSOC预算的主要贡献者.
生物质燃烧释放出水溶性化合物,这些化合物直接形成WSOC或在大气处理后成为WSOC.
主要有机碳的远程运输和化学加工显著影响了WSOC的形成,特别是在印度河平原等外流地区.

结论:

来自生物质燃烧的初级有机气溶的氧化和老化是南亚地区WSOC的重要来源.
远程运输在化学加工和随后的WSOC形成中发挥着重要作用.
该研究强调了排放来源,大气处理和该地区的WSOC丰富性之间的复杂相互作用.

关键词:

生物质燃烧生物质的燃烧.大陆和海洋的大气层.地区的异质性地区的异质性在水中溶解的有机碳.

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