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首页> 外文期刊>Atmospheric chemistry and physics >Aerosol optical properties relevant to regional remote sensing of CCN activity and links to their organic mass fraction: Airborne observations over Central Mexico and the US West Coast during MILAGRO/INTEX-B
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Aerosol optical properties relevant to regional remote sensing of CCN activity and links to their organic mass fraction: Airborne observations over Central Mexico and the US West Coast during MILAGRO/INTEX-B

机译：与CCN活动的区域遥感有关的气溶胶光学特性及其与有机物质量分数的联系：MILAGRO / INTEX-B期间在墨西哥中部和美国西海岸的空中观测

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摘要

Remote sensing of cloud condensation nuclei (CCN) would help evaluate the indirect effects of tropospheric aerosols on clouds and climate. To assess its feasibility, we examined relationships of submicron aerosol composition to CCN activity and optical properties observed during the MILAGRO/INTEX-B aircraft campaigns. An indicator of CCN activity, K, was calculated from hygroscopicity measured under saturation, K for dry 100nm particles decreased with increasing organic fraction of non-refractory mass of submicron particles (OMF) as 0.34-0.20xOMF over Central Mexico and 0.47-0.43xOMF over the US West Coast. These fits represent the critical dry diameter, centered near 100 nm for 0.2% supersaturation but varied as K~((-1/3)), within measurement uncertainty (～20%). The decreasing trends of CCN activity with the organic content, evident also in our direct CCN counts, were consistent with previous ground and laboratory observations of highly organic particles. The wider range of OMF, 0-0.8, for our research areas means that aerosol composition will be more critical for estimation of CCN concentration than at the fixed sites previously studied. Furthermore, the wavelength dependence of extinction was anti-correlated with OMF as -0.70xOMF+2.0 for Central Mexico's urban and industrial pollution air masses, for unclear reasons. The Angstrom exponent of absorption increased with OMF, more rapidly under higher single scattering albedo, as expected for the interplay between soot and colored weak absorbers (some organic species and dust). Because remote sensing products currently use the wavelength dependence of extinction albeit in the column integral form and may potentially include that of absorption, these regional spectral dependencies are expected to facilitate retrievals of aerosol bulk chemical composition and CCN activity over Central Mexico.
机译：遥感云凝结核（CCN）将有助于评估对流层气溶胶对云和气候的间接影响。为了评估其可行性，我们检查了在MILAGRO / INTEX-B飞机战役期间观察到的亚微米气溶胶成分与CCN活性和光学性质之间的关系。 CCN活性的指标K是根据饱和条件下测得的吸湿性计算得出的，干燥的100nm颗粒的K随中部墨西哥中部非耐火材料亚微米级颗粒（OMF）的有机组分的增加（0.34-0.20xOMF和0.47-0.43xOMF）而降低在美国西海岸。这些拟合表示临界干直径，对于0.2％的过饱和，中心位于100 nm附近，但在测量不确定度（〜20％）之内以K〜（（-1/3））变化。 CCN活性随有机物含量下降的趋势，在我们直接的CCN计数中也很明显，与先前对高有机颗粒的地面观察和实验室观察一致。对于我们的研究领域，OMF的范围更广，为0-0.8，这意味着与以前研究的固定位置相比，气溶胶成分对CCN浓度的估计将更为关键。此外，由于不清楚的原因，对于墨西哥中部城市和工业污染气团，消光的波长依赖性与OMF为-0.70xOMF + 2.0反相关。吸收的Angstrom指数随OMF的增加而增加，在较高的单散射反照率下会更快，这与烟灰和有色弱吸收剂（某些有机物和粉尘）之间的相互作用有关。由于遥感产品目前使用的是灭绝的波长依赖性，尽管是柱状积分形式，并且可能包括吸收波长，因此这些区域光谱依赖性有望促进墨西哥中部气溶胶的化学成分和CCN活性的获取。

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