SGER: Exploration for Aerosols in Nucleated Marine Coastal Environment

该项目正在阿拉斯加湾一个相对未受污染但生物丰富的潮间带沿海地区对气溶胶进行探索性实地观测。其目的是探索气溶胶的成核，随后的增长和云成核特性，以确定这个源的“背景”对流层气溶胶人口的贡献。在另一个地点的观测表明，在低潮时，可能会有大量的新粒子产生的均匀成核和非均匀生长的粒子在这样一个网站。该项目将探索这种可能性，如果观察到这种粒子的产生，将为未来的多学科项目奠定基础，以更详细地探索成核过程。具体目标是确定是否有大量的新粒子生产在低潮期间，并确定是否爆发显示出与潮汐相关联的证据，以确定新形成的粒子与阳光强度和气象条件的关联，并测量新成核胚胎的生长速率。该项目还为阿拉斯加清洁沿海环境制作气溶胶粒度分布的气候记录，该奖项的主要广泛影响可能是证明一个项目的可行性，该项目有可能涉及许多其他调查人员，并有助于提高对清洁地区气溶胶来源的了解。这些气溶胶对云的性质、大气中的辐射传输和大气中的非均质化学有着广泛的影响，因此对其来源的更好理解可能会改善它们在大气过程模型中的表现方式。

This project is making exploratory field observations of aerosols at a relatively unpolluted but biologically rich intertidal coastal location in the Gulf of Alaska. The objective is to explore the nucleation, subsequent growth, and cloud nucleating properties of aerosols to determine the contribution of this source to the "background" tropospheric aerosol population. Observations at another location have suggested that, at low tide, there may be substantial new particle production by homogeneous nucleation and heterogeneous growth of particles at such a site. This project will explore this possibility and, if such particle production is observed, will establish the basis for a future multidisciplinary project to explore the nucleation process in greater detail. The specific objectives are to determine if there is substantial new-particle production during low tide, and to determine if the bursts show evidence of being correlated with tidal phase, to determine the association of the newly formed particles to sunlight intensity and meteorological conditions, and to measure the growth rates of newly nucleated embryos. The project is also producing a climatological record of the aerosol size distribution for the clean coastal Alaskan environment.The primary broader impact of this award is likely to be the demonstration of feasibility of a project that has the potential to involve many other investigators and can help improve understanding of aerosol sources in clean regions. These aerosols have widespread effects on cloud properties, radiative transfer in the atmosphere, and heterogeneous chemistry in the atmosphere, so improved understanding of their sources may lead to improvements in the ways they are represented in models of atmospheric processes.