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Updated: May 28, 2025

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黑色和棕色碳的光吸收在中国东部

Rongzhi Tang¹, Weizhen Cui¹, Xiuli Zhang²

¹School of Energy and Environment, City University of Hong Kong, Hong Kong.

Journal of hazardous materials

|February 12, 2025

概括

这项研究使用了新的贝叶斯推理模型来分析路边气溶中的黑碳 (BC) 和棕色碳 (BrC). 该模型成功地区分了BC,BrC和白碳,揭示了BrC.

科学领域:

大气化学大气化学
气溶科学气溶科学
环境监测环境监测

背景情况:

黑碳 (BC) 和棕色碳 (BrC) 是大气碳酸气溶中吸光的关键组成部分.
关于BrC度和辐射影响的数据有限,因为测量吸光性质存在挑战.
了解BC和BrC对于准确的气候建模和空气质量评估至关重要.

研究的目的:

系统地研究BC和BrC在路边的属性,使用新的贝叶斯推理 (BI) 模型.
为了将总碳 (TC) 分解为BC,BrC和白碳 (WtC) 组件.
分析BC和BrC光吸收的季节性变化和日间模式.

主要方法:

应用一个新的贝叶斯推理 (BI) 模型与传统的BC和BrC模型一起.
使用了来自7波长乙醇计和总碳 (TC) 分析仪的数据.
对BC的来源分配和BrC的初级和二级组件的光吸收的详细分析.

主要成果:

在秋季和冬季,BI模型成功地将TC分解为BC (43.4%),WtC (29.5%) 和BrC (27.1%).
在BI和BC的传统模型之间发现了强烈的一致性 (R > 0.95),以及其在880nm的质吸收系数.
生物质燃烧被确定为一个重要的BC来源,特别是在冬天的晚上. 二次BrC吸收在冬季达到峰值,特别是在夜间,可能与NO3化学有关.
在中午观察到BrC光漂白,早晨的过程受到交通排放的影响,表明形成/排放率超过光漂白.

结论:

新的BI模型提供了一种可靠的方法来解决碳酸性气溶组件.
BrC表现出显著的季节和日间变化,二次 BrC 在冬季起着显著的作用.
交通排放可以干扰BrC光漂白过程,突出了城市环境中气溶化学的复杂性.

关键词:

贝叶斯的推理贝叶斯的推理碳黑是一种碳黑.主要的棕色碳主要是棕色碳.二次棕色碳二次棕色碳是什么

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