Combining POLDER-3 satellite observations and WRF-Chem numerical simulations to derive biomass burning aerosol properties over the Southeast Atlantic region
Combining POLDER-3 satellite observations and WRF-Chem numerical simulations to derive biomass burning aerosol properties over the Southeast Atlantic region
复制标题
结合 POLDER-3 卫星观测和 WRF-Chem 数值模拟得出东南大西洋地区生物质燃烧气溶胶特性
DOI：
10.5194/acp-2021-256
复制
发表时间：
2021
影响因子：
6.3
通讯作者：
I. Chiapello
中科院分区：
文献类型：
--
作者：
Kayode Abraham Simeon;F. Waquet;J. Péré;F. Ducos;F. Thieuleux;F. Peers;S. Turquety;I. Chiapello
摘要。气溶胶吸收是评估气溶胶在全球和区域尺度上对气候的辐射影响的一个关键特性。在气候模式中，气溶胶的物理化学和光学特性仍然没有得到充分的约束，难以正确地表示晴天和多云场景下的气溶胶负荷及其吸收特性，特别是吸收生物质燃烧气溶胶（BBA）。在这项研究中，我们重点研究了在非洲西南海岸东南大西洋（SEA）地区云层上运输的生物质燃烧（BB）颗粒羽流，以改善其物理化学和吸收特性的表征。该方法基于来自WRF-Chem耦合气象化学模型的气溶胶区域数值模拟，结合详细的BB排放清单和来自POLDER-3/PARASOL空间传感器的各种创新气溶胶遥感观测，包括晴空和多云天空。目前的文献表明，一些主要由生物质燃烧释放的称为“棕色碳”（BrOC）的有机气溶胶化合物（OC）比纯黑碳（BC）更有效地吸收紫外光蓝辐射。通过比较POLDER-3卫星443 ~ 1020nm波段气溶胶单散射反照率（SSA）的光谱依赖性，并考虑颗粒均匀的内部混合状态，在源水平上模拟不同比例的BC、OC和BrOC的SSA。这些数值模拟实验主要基于两个限制条件：在晴朗和多云的场景中保持真实的气溶胶光学深度和真实的BC/OC质量比。提出并讨论了模拟实验，将化学成分与BBA的吸收特性联系起来，并提供了2008年7月在东南亚地区运输的非洲BBA羽流中黑色、有机和棕色碳的相对比例的估计。BBA羽流中有机气溶胶的吸收部分，即溴化碳，估计为2%至3%。在晴空和云层以上场景下，模拟的平均SSA分别为0.81 （565 nm）和0.84 (550 nm)，与POLDER-3在研究期间的平均SSA（晴空565 nm和云层以上550 nm）值（0.85±0.05）吻合良好。
Abstract. Aerosol absorption is a key property to assess the radiative impacts of aerosols on climate at both global and regional scales. The aerosol physico-chemical and optical properties remain not sufficiently constrained in climate models, with difficulties to properly represent both the aerosol load and their absorption properties in clear and cloudy scenes, especially for absorbing biomass burning aerosols (BBA). In this study we focus on biomass burning (BB) particle plumes transported above clouds over the Southeast Atlantic (SEA) region off the southwest coast of Africa, in order to improve the representation of their physico-chemical and absorption properties. The methodology is based on aerosol regional numerical simulations from the WRF-Chem coupled meteorology-chemistry model combined with a detailed inventory of BB emissions and various sets of innovative aerosol remote sensing observations, both in clear and cloudy skies from the POLDER-3/PARASOL space sensor. Current literature indicates that some organic aerosol compounds (OC) called "brown carbon" (BrOC), primarily emitted by biomass combustion absorb the ultraviolet-blue radiation more efficiently than pure black carbon (BC). We exploit this specificity by comparing the spectral dependence of the aerosol single scattering albedo (SSA) derived from the POLDER-3 satellite observations in the 443–1020 nm wavelength range with the SSA simulated for different proportions of BC, OC and BrOC at the source level, considering the homogeneous internal mixing state of particles. These numerical simulation experiments are based on two main constraints: maintaining a realistic aerosol optical depth both in clear and above cloudy scenes and a realistic BC/OC mass ratio. Modelling experiments are presented and discussed to link the chemical composition with the absorption properties of BBA and to provide estimates of the relative proportions of black, organic and brown carbon in the African BBA plumes transported over the SEA region for July 2008. The absorbing fraction of organic aerosols in the BBA plumes, i.e., BrOC, is estimated at 2 to 3 %. The simulated mean SSA are 0.81 (565 nm) and 0.84 (550 nm) in clear and above cloudy scenes respectively, in good agreement with those retrieved by POLDER-3 (0.85 ± 0.05 at 565 nm in clear-sky and at 550 nm above clouds) for the studied period.
影响因子：
6.3
作者：
Gordon, Hamish;Field, Paul R.;Carslaw, Ken S.
通讯作者：
Carslaw, Ken S.
影响因子：
4.4
作者：
Capes, G.;Johnson, B.;Coe, H.
通讯作者：
Coe, H.
影响因子：
6.3
作者：
Bian, Huisheng;Chin, Mian;Tsyro, Svetlana G.
通讯作者：
Tsyro, Svetlana G.