Multi-site Synthesis of the Role of Canopy Processes and Emissions on Ozone and Secondary Organic Aerosols

冠层过程和排放对臭氧和二次有机气溶胶作用的多位点合成

• 批准号: 1242203
• 负责人: Allison Steiner
• 金额: $ 45.67万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-04-01 至 2017-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1242203&HistoricalAwards=false
• 关键词: Multi; site; Synthesis; Role; Canopy

The emissions of biogenic volatile organic compounds (BVOCs), such as those from terrestrial vegetation, are known to exert significant control on tropospheric composition and the oxidation capacity of the atmosphere through:(1) their formation of ozone in the presence of reactive nitrogen oxides (NOx = NO + NO2) and sunlight, (2) the regulation of hydrogen oxide radicals (HOx = OH + HO2) and(3) the formation of secondary organic aerosols (SOA) through the transformation of BVOC oxidation products Field campaigns in forested regions continue to improve our understanding of the role of BVOC emissions on gas-phase tropospheric chemistry, yet large uncertainties remain regarding their detailed role in HOx chemistry and SOA formation. A multi-site synthesis is needed to improve understanding of the key physical and chemical processes needed to account for BVOC reactivity. Using a computationally efficient one-dimensional (1D) model, with the ultimate goal of improving regional- and global-scale representation of of BVOCs, researchers from University of Michigan and Washington State hypothesize that many of the HOx mechanism changes recently developed for tropical forests will not achieve the desired model improvement at mid-latitudes. Observations from some five individual US campaigns are to be synthesized in a comprehensive manner and this meta-synthesis is hoped to clarify the role of forests on tropospheric chemistry in moderately clean to polluted regions such as found in the continental US. Since BVOC are also important precursors for short-lived climate forcing agents such a ozone and atmospheric aerosols, improved representation of these species is also needed in future climate models.

生物挥发性有机化合物（BVOCs）的排放，如来自陆地植被的排放，已知通过以下方式对对流层的组成和大气的氧化能力施加重大控制：（1）在反应性氮氧化物存在下形成臭氧（NOx = NO + NO2）和阳光，（2）氢氧自由基的调节（HOx = OH + HO 2）和（3）通过BVOC氧化产物的转化形成二次有机气溶胶（SOA）在森林地区的实地活动继续提高我们对BVOC排放对气体的作用的理解-相对流层化学，但大的不确定性仍然关于他们的详细作用HOx化学和SOA的形成。需要多位点合成来提高对解释BVOC反应性所需的关键物理和化学过程的理解。使用计算效率高的一维（1D）模型，最终目标是改善BVOCs的区域和全球尺度的代表性，来自密歇根大学和华盛顿州的研究人员假设，最近为热带森林开发的许多HOx机制变化将无法在中纬度地区实现所需的模型改进。将以综合的方式综合来自美国大约五个单独活动的观测结果，希望这种综合综合分析能够澄清森林对美国大陆等中度清洁至污染地区对流层化学的作用。由于BVOC也是臭氧和大气气溶胶等短期气候强迫因子的重要前体，因此在未来的气候模型中也需要改进这些物种的代表性。