Remote sensing and analysis of 2nd order, Arctic-aerosol parameters

二阶北极气溶胶参数的遥感和分析

• 批准号: RGPIN-2017-05531
• 负责人: ONeill, Norm
• 金额: $ 1.6万
• 依托单位: Université de Sherbrooke
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=755083
• 关键词: Remote; sensing; analysis; 2nd; order

Aerosols are commonly defined as atmospheric particles whose size ranges from a small fraction of a micrometer to tens of micrometers. They originate from a large variety of aerosol emission processes : forest fires, wind-blown deserts, gas to particle conversion, volcanic eruptions and ocean wave processes are some of the major natural aerosol sources while fossil fuel combustion due to urban and industrial processes is the most important anthropogenic source. Aerosols can, at least as far as their optical effects are concerned, be largely divided into bi-modal, fine and coarse mode components (roughly sub and super micrometer in radius).Over the next five years, we will continue to pursue research into the characterization of bi-modal parameters such as fine and coarse mode aerosol optical depth (a parameter which is basically proportional to the column concentration of aerosols) and fine and coarse mode effective radius (average columnar radius) as a function of aerosol species. The proposed research within the context of this DG application will be focused on the higher risk extraction of refractive index information (both the real part which is an important driver of aerosol scattering properties and complex parts which is the major driver of aerosol absorption properties) from both surface and columnar optical instruments. These activities are will be subdivided into three research projects : (i) a 2-year postdoc led study on the retrieval of real and complex parts of the refractive index from surface spectral measurements and optical properties deduced from microphysical and speciation surface measurements. (ii) an optical retrieval analysis, led by a PhD student, of surface to column propagation of the fine mode refractive index findings of the pdf project (iii) a parallel coarse mode analysis (in close collaboration with the first PhD student) led by a second PhD student.Remote sensing research in the Arctic is particularly relevant in a social benefit context since this region is known to magnify climate change effects (as described in the most recent IPCC report for example). Aerosols, by virtue of their direct (scattering and absorption) effects and indirect (aerosol cloud interaction) effects are the greatest source of uncertainty in climate change dynamics (ibid). A better understanding of aerosol opto-physical parameters, notably intensive parameters such as average size and refractive index will help to calibrate and improve the aerosol dynamics packages of Arctic-aerosol models and accordingly lead to important consequences in terms of radiative forcing and climate models of the Arctic.

气溶胶通常被定义为大气颗粒，其大小范围从一微米的一小部分到几十微米。它们源于各种各样的气溶胶排放过程：森林火灾、风吹沙漠、气体到颗粒的转化、火山爆发和海浪过程是一些主要的天然气溶胶来源，而城市和工业过程引起的化石燃料燃烧是最重要的人为来源。至少就其光学效应而言，气溶胶可以在很大程度上分为双模态、细模态和粗模态组分（半径大致为亚微米和超微米）。在接下来的五年中，我们将继续研究双模态参数的特征，如细模和粗模气溶胶光学深度（一个基本与气溶胶柱浓度成正比的参数）和细模和粗模有效半径（平均柱半径）作为气溶胶种类的函数。在此DG应用的背景下，拟议的研究将集中在从表面和柱状光学仪器中提取折射率信息（包括实部，这是气溶胶散射特性的重要驱动因素和复杂部分，这是气溶胶吸收特性的主要驱动因素）的高风险。这些活动将细分为三个研究项目：(i)由博士后领导的一项为期两年的研究，从表面光谱测量和从微物理和物种形成表面测量推断出的光学特性中检索折射率的真实和复杂部分。（ii）由一名博士生领导，对pdf项目中精细模式折射率的表面到柱传播进行光学检索分析（iii）由另一名博士生领导进行平行粗模式分析（与第一名博士生密切合作）。北极的遥感研究在社会效益方面尤为重要，因为众所周知该地区会放大气候变化的影响（例如IPCC最近的报告所述）。气溶胶由于其直接（散射和吸收）效应和间接（气溶胶云相互作用）效应是气候变化动力学中最大的不确定性来源（同上）。更好地了解气溶胶光学物理参数，特别是密集参数，如平均大小和折射率，将有助于校准和改进北极气溶胶模式的气溶胶动力学包，从而在北极辐射强迫和气候模式方面产生重要影响。