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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Smoke aerosol from biomass burning in Mexico: Hygroscopic smoke optical model
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Smoke aerosol from biomass burning in Mexico: Hygroscopic smoke optical model

机译：墨西哥生物质燃烧产生的烟雾气溶胶：吸湿烟雾光学模型

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The May 1998 transport of smoke from fires in Mexico and Central America into the United States is examined. We combine data from ground-based Interagency Monitoring of Protected Visual Environments aerosol chemical sampling sites with in situ airborne and Sun photometer measurements to develop a consistent picture of the transported smoke-impacted aerosol optical and chemical properties. The aerosol observed in Mexico and the southern United States is found to have a higher sulfate mass fraction, higher single-scattering albedo, and larger accumulation mode radius than biomass burning aerosols observed by similar instrumentation in South America and Africa. We postulate that the smoke-impacted aerosol in the 1998 event was more hygroscopic than that observed in the other locations, because of the higher mass fractions of sulfate, and show that a simple model of corresponding changes in aerosol water content yields agreement with the observed variations in refractive index and radii. We further show that the single-scattering albedo cannot be fully explained by hygroscopic growth alone. Modifications to the model invoking variations in aerosol light-absorbing carbon content, which are consistent with differences in observed composition among the various smoke-impacted aerosols, bring the predictions of single-scattering albedo into alignment with our observations. The model demonstrates that the panicle size, single-scattering albedo, and real refractive index of smoke-impacted aerosols are not independent but vary in tandem with variations in particle hygroscopicity and with variations in black carbon content. This relationship is an important consideration in the assessment of the effects of biomass burning aerosols, particularly those subject to long-range transport, on radiative forcing and climate. [References: 26]
机译：考察了1998年5月墨西哥和中美洲大火将烟雾输送到美国的情况。我们将来自受保护的视觉环境气溶胶化学采样地点的地面机构间监测数据与原位机载和太阳光度计测量结果结合起来，以得出运输的烟雾影响的气溶胶光学和化学性质的一致图像。与在南美和非洲通过类似仪器观测到的生物质燃烧气溶胶相比，在墨西哥和美国南部观测到的气溶胶具有更高的硫酸盐质量分数，更高的单散射反照率和更大的积累模式半径。我们推测，由于硫酸盐的质量分数较高，在1998年事件中受烟雾影响的气溶胶比在其他位置观察到的更易吸湿，并且表明，相应的气溶胶水含量变化的简单模型与观察到的一致折射率和半径的变化。我们进一步表明，单散射反照率不能仅由吸湿性增长完全解释。对模型的修改涉及气溶胶吸光碳含量的变化，这与各种受烟雾影响的气溶胶在观察到的成分上的差异相一致，从而使单散射反照率的预测与我们的观察结果一致。该模型表明，受烟雾影响的气溶胶的穗大小，单散射反照率和实际折射率不是独立的，而是随颗粒吸湿性的变化和黑碳含量的变化而变化。在评估燃烧生物质的气雾剂，特别是那些长期运输的气雾剂对辐射强迫和气候的影响时，这一关系是重要的考虑因素。 [参考：26]

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