Anzahl- und Massenflüsse von Aerosolpartikeln über einer Stadt, erfasst mit hoher Größenauflösung

本建议的范围是量化城市树冠上的气溶胶粒子数量和质量通量。我们计划解决一个仍然广泛开放的科学领域。仪器技术的最新发展现在提供了直接研究这些通量的机会，采用涡动相关法。城市化地区既是颗粒物的来源，也是颗粒物的汇。源特性主要适用于颗粒数，这是未来有关纳米级气溶胶颗粒毒理学考虑的一个相关参数。汇特征更适用于质量输运，这对目前的研究（和目前的立法）、PM2.5和PM10源分配的研究以及将粒子输运实现到中尺度输运模式都很重要。目前，对城市交换过程及其时空特征的研究还很少。这项研究旨在提供一个大数据基础，以了解这些通量作为大气条件（即稳定性）、土地利用（排放因子）、一天、一周和一年的时间，以及最重要的气溶胶大小的函数。只有通过通量的详细大小分离，我们才能进一步了解对通量起作用的气溶胶动力学过程。研究的一个重要问题是成核过程在粒子的大气数量和质量输运中的作用。

The scope of this proposal is to quantify aerosol particle number and mass fluxes over an urban canopy. We plan to address a scientific field that is still widely open. Recent development of instrumental techniques now offers the chance to study these fluxes directly, employing the eddy covariance method. Urbanized areas are both sources and sinks for particles. The source characteristic applies mainly to the particle number, which is a relevant parameter for future toxicological considerations concerning nano-sized aerosol particles. The sink characteristic rather applies to the mass transport, which is important for present studies (and present legislation), for the study of source apportionment of PM2.5 and PM10, and for implementation of particle transport to mesoscale transport models. Presently, there is little knowledge about the exchange processes over the cities and their temporal and spatial characteristics. This study aims to produce a large data basis to produce understanding of these fluxes as function of atmospheric conditions (i.e., stability), land use (emission factors), time of day, week, and year, and, mostly important, of aerosol size. Only through a detailed size segregation of the fluxes we can develop understanding of the aerosol dynamical processes contributing to the fluxes. One of the important issues to be studied is the role of nucleation processes during atmospheric number and mass transport of particles.