Investigating the light-absorbing carbonaceous aerosol lineage: The brown carbon - black carbon continuum

研究吸光碳质气溶胶谱系：棕碳-黑碳连续体

基本信息

批准号：
1748080
负责人：
Rawad Saleh
金额：
$ 42.05万
依托单位：
University of Georgia Research Foundation Inc
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-01-15 至 2021-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1748080&HistoricalAwards=false
关键词：
Investigating light absorbing carbonaceous aerosol

项目摘要

Over the past two decades, it has been established that black carbon (BC), also known as soot, is a significant light absorber with a climate-warming effect potentially second only to carbon dioxide. However, the climate forcing effect of BC is subject to large uncertainties, and resolution is crucial for constraining the climate sensitivity of combustion carbon. One of the major contributors to this uncertainty is the limited understanding of light absorption by BrC, which is often co-emitted with BC, thus coupling the effects of the two. This project will promote graduate and undergraduate research by constituting a major component of a PhD dissertation and involving undergraduate students in the project. Third, the project will involve an outreach component through the involvement in workshops led by the UGA College of Education aiming at creating spaces where bilingual (Hispanic) middle- and high-school students, their parents and teachers, and researchers can engage in science-learning (STEM) activities. BrC light-absorption properties (the most relevant properties for climate calculations) are poorly constrained, with reported values varying over two orders of magnitude. The source of this variability is largely unknown, posing major challenges to representing BrC in climate models. This work will build on advances in BC formation research in the field of combustion science and recent findings by the PI to understand the effects of BrC. The main hypothesis of the project is that a major fraction of BrC is comprised of organic precursors of BC, and that BrC exhibits a continuum of light-absorption properties that can be correlated with molecular mass and volatility.

在过去的二十年中，已经确定黑碳（BC）（也称为烟灰）是一种显着的光吸收器，具有气候温暖效果，可能仅次于二氧化碳。然而，BC的气候强迫效应受到较大的不确定性的影响，而解决对于限制燃烧碳的气候敏感性至关重要。这种不确定性的主要因素之一是BRC对光吸收的有限理解，该理解通常与BC共同使用，从而耦合了两者的效果。该项目将通过构成博士学位论文的主要组成部分并参与该项目，从而促进研究生和本科研究。第三，该项目将涉及由UGA教育学院领导的研讨会的参与，旨在创建双语（西班牙裔）中学和高中生，父母和老师，研究人员可以从事科学学习（STEM）活动。 BRC吸收特性（气候计算最相关的特性）的约束很差，报告的值在两个数量级以上。这种可变性的来源在很大程度上是未知的，在气候模型中代表BRC面临着重大挑战。这项工作将建立在燃烧科学领域的卑诗省形成研究的基础上，以及PI的最新发现，以了解BRC的影响。该项目的主要假设是，BRC的主要部分由BC的有机前体组成，并且BRC表现出可与分子质量和挥发性相关的连续吸收特性。