Thermohygroscopic properties of biogenic particles from the sea-surface microlayer

海面微层生物颗粒的热吸湿特性

• 批准号: 66270692
• 负责人: Professor Dr. Jost Heintzenberg
• 金额: --
• 依托单位: Leibniz-Institut für Troposphärenforschung e.V. (TROPOS)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/66270692?language=en
• 关键词: Thermohygroscopic; properties; biogenic; particles; sea

This project is dedicated to field and laboratory investigations of the characteristics of biogenic aerosol particles derived from the sea-surface microlayer (SML). After two Arctic Ocean expeditions and additional recent findings from other parts of the world's oceans these SML-derived particles have come into the focus of marine aerosol research because of their likely widespread occurrence and because of the lack of understanding concerning their generation and physicochemical properties. Part of this lack of understanding is due to the unstable nature und the highly complex composition of SML-derived material. The upcoming Arctic Summer Cloud Study (ASCOS; http://www.misu.su.se/~michaelt- / ASCOS/ASCOS. htm) to be launched in the summer of 2008 provides a unique opportunity to use highly sensitive in situ aerosol instrumentation developed at IfT to characterize the thermohygroscopic particle properties as proxies for their physicochemical characteristics. At the same time new SML-samples will be collected during ASCOS, which, together with samples from AOE-2001 (the Arctic Ocean Experiment in summer of 2001) the North Atlantic, and the Baltic Sea, will be utilized in subsequent laboratory experiments at IfT. In these laboratory experiments aerosol particles will be generated from the SML-samples for detailed thermohygroscopic characterization up to 300°C and 101% relative humidity. Complementary chemical analyses will characterize the different SML-samples as far as state-of-the-art bulk methods allow. By exposing SML-derived particles to UV/VIS light in an aerosol chamber and by evaporating fog drops generated on SML-derived particles the stability of airborne SML-derived material will be explored. Finally a size-dependent particle model will be developed to describe the thermohygroscopic properties and stability of SML-derived particles that is consistent with both field data from AOE-2008 and with the subsequent laboratory results. The work will be realized within the scope of a Ph.D. thesis at Leipzig University.

该项目致力于对源自海面微层（SML）的生物气溶胶颗粒的特性进行实地和实验室调查。经过两次北冰洋考察和最近从世界其他地区的海洋中发现这些SML衍生的颗粒已经成为海洋气溶胶研究的焦点，因为它们可能广泛存在，因为缺乏了解他们的生成和物理化学性质。这种缺乏了解的部分原因是由于不稳定的性质和高度复杂的组成SML衍生材料。即将进行的北极夏季云研究（ASCOS; http://www.misu.su.se/~michaelt-）。htm）将于2008年夏季发射，这为使用IfT开发的高灵敏度原位气溶胶仪器来表征作为其物理化学特性代表的吸湿颗粒特性提供了一个独特的机会。与此同时，将在南极海洋观测系统期间收集新的标准海洋层样本，这些样本将与AOE-2001（2001年夏季北冰洋实验）、北大西洋和波罗的海的样本一起用于IfT随后的实验室实验。在这些实验室实验中，将从SML样品中产生气溶胶颗粒，以进行高达300°C和101%相对湿度的详细热吸湿表征。补充化学分析将在最先进的散装方法允许的范围内表征不同的SML样品。通过将SML衍生颗粒暴露于气溶胶室中的UV/维斯光，并通过蒸发SML衍生颗粒上产生的雾滴，将探索气载SML衍生材料的稳定性。最后，将开发一个尺寸相关的颗粒模型，以描述SML衍生颗粒的热吸湿特性和稳定性，该模型与AOE-2008的现场数据和随后的实验室结果一致。这项工作将在博士学位的范围内实现。莱比锡大学的毕业论文