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首页> 外文期刊>Atmospheric Chemistry and Physics Discussions >Particle partitioning potential of organic compounds is highest in the Eastern US and driven by anthropogenic water
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Particle partitioning potential of organic compounds is highest in the Eastern US and driven by anthropogenic water

机译：在美国东部，受人为水驱使，有机化合物的颗粒分配潜力最高

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pstrongAbstract./strong Gas-phase water-soluble organic matter (WSOMsubg/sub) is ubiquitous in the troposphere. In the summertime, the potential for these gases to partition to particle-phase liquid water (Hsub2/subOsubptcl/sub) where they can form secondary organic aerosol (SOAsubAQ/sub) is high in the Eastern US and low elsewhere, with the exception of an area near Los Angeles, CA. This spatial pattern is driven by mass concentrations of Hsub2/subOsubptcl/sub, not WSOMsubg/sub. Hsub2/subOsubptcl/sub mass concentrations are predicted to be high in the Eastern US, largely due to sulfate. The ability of sulfate to increase Hsub2/subOsubptcl/sub is well established and routinely included in atmospheric models; however WSOMsubg/sub partitioning to this water and subsequent SOA formation is not. The high mass concentrations of Hsub2/subOsubptcl/sub in the southeast (SE) US but not the Amazon may help explain why biogenic SOA mass concentrations are high in the SE US but low in the Amazon. Furthermore, during the summertime in the Eastern US, the potential for organic gases to partition into liquid water is greater than their potential to partition into organic matter (OM) because concentrations of WSOMsubg/sub and Hsub2/subOsubptcl/sub are higher than semi-volatile gases and OM. Thus, unless condensed phase yields are substantially different ( ~ order of magnitude), we expect that SOA formed through aqueous-phase pathways (SOAsubAQ/sub) will dominate in the Eastern US. These findings also suggest that Hsub2/subOsubptcl/sub is largely anthropogenic and provide a previously unrecognized mechanism by which anthropogenic pollutants impact the amount of SOA mass formed from biogenic organic emissions. The previously reported estimate of the controllable fraction of biogenic SOA in the Eastern US (50%) is likely too low./p.
机译：> >摘要。对流层中普遍存在气相水溶性有机物（WSOM g ）。在夏季，这些气体可能分配到颗粒相液态水（H 2 O ptcl ）中，在那里它们可以形成二次有机气溶胶（SOA AQ ）在美国东部地区最高，而在其他地区则较低，除了加利福尼亚洛杉矶附近的地区。这种空间格局是由H 2 O ptcl 而不是WSOM g 的质量浓度驱动的。据预测，在美国东部，H 2 O ptcl 的质量浓度较高，这主要是由于硫酸盐。硫酸盐增加H 2 O ptcl 的能力已得到很好的确立，并通常包括在大气模型中。但是，WSOM g 不能分配到该水中，因此不能形成随后的SOA。美国东南部（SE）的H 2 O ptcl 的高质量浓度，但亚马逊地区可能无法解释为什么美国东南部的生物SOA质量浓度高在亚马逊。此外，在美国东部的夏季，由于WSOM g 和H 的浓度，有机气体分配到液态水中的潜力大于其分配到有机物质（OM）中的潜力。 2 O ptcl 高于半挥发性气体和OM。因此，除非凝聚相的收率基本不同（>〜数量级），否则我们预计通过水相途径形成的SOA（SOA AQ ）将在美国东部占主导地位。这些发现还表明，H 2 O ptcl 很大程度上是人为的，并提供了以前未被认识的机制，人为的污染物通过该机制影响由生物有机排放物形成的SOA量。先前报道的对美国东部可控制比例的生物SOA（50％）的估计可能太低了。。

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