Reconciliation of measurements of hygroscopic growth and critical supersaturation of aerosol particles in central Germany
Reconciliation of measurements of hygroscopic growth and critical supersaturation of aerosol particles in central Germany
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DOI：
10.5194/acp-10-11737-2010
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发表时间：
2010-01-01
影响因子：
6.3
通讯作者：
McFiggans, G.
中科院分区：
文献类型：
--
作者：
Irwin, M.;Good, N.;McFiggans, G.
在2007年6月和7月在德国西南部黑森林的Hornisgrinde山地，在COPS（对流和地形引起的降水研究）期间，在COPS（对流和地形引起的降水研究）的一系列气管中测量了气溶胶物理，化学和吸湿性。用气溶胶质谱仪测量了非fractractory气溶胶组成，同时又是86％的相对湿度和CCN活性测量的干燥（<20％）直径为27至217 nm的颗粒，颗粒水的摄入量具有实质性可变性，并显示出86％的相对湿度和CCN活性测量。时间和粒度的时间。尺寸表明对颗粒水亲和力的重要成分影响。使用单个参数的吸湿性近似，从测量的HTDMA平均生长因子偏离了临界性过饱和预测，超出了测量不确定性，偏离了从CCN测量的关键过饱和度。这些导致差异在CCN数量（N-CCN）的平均值约为35％，以取决于平均方法，而单个时间段内通常要大得多。这表明在本实验中通过单个参数表示未解决的水吸收行为的各个方面，取决于其起源，可能对其广义使用产生重要影响。
Aerosol physical, chemical and hygroscopic properties were measured in a range of airmasses during COPS (Convective and Orographically-induced Precipitation Study) ground-based in June and July of 2007 at the Hornisgrinde mountain site in the Black Forest, Southwest Germany. Non-refractory aerosol composition was measured with an Aerosol Mass Spectrometer, simultaneous to hygroscopic growth factors at 86% relative humidity and CCN activity measurements for particles of dry (< 20%) diameters 27 to 217 nm, with particle water uptake exhibiting substantial variability with time and with particle size.Variability in the measurements of hygroscopic growth factor and critical supersaturation for particles of similar sizes indicates significant compositional impact on particle water affinity. Critical supersaturation prediction using a single parameter hygroscopicity approximation derived from measured HTDMA mean growth factors deviate, beyond measurement uncertainties, from critical supersaturations derived from CCN measurements. These led to differences averaging around 35% in the number of CCN (N-CCN) for the most reliable measurements depending on averaging methodology, often very much larger for individual time periods. This indicates aspects of water uptake behaviour unresolved in this experiment by the single parameter representation which, depending on its origin, may have important consequences on its generalised use.