Analysis of satellite measurements of halogen oxides in the Antarctic: source regions, transport and comparison to model simulations

南极卤氧化物卫星测量分析：源区、迁移以及与模型模拟的比较

• 批准号: 45789433
• 负责人: Dr. Andreas Richter
• 金额: --
• 依托单位: Institut für Umweltphysik (IUP)
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/45789433?language=en
• 关键词: Analysis; satellite; measurements; halogen; oxides

Sea ice is a major source of atmospheric sea salt in Antarctica. This recent finding triggered a change in paradigm for the paleoclimatic interpretation of polar ice core records. Moreover, the release of reactive gas-phase halogens from the salty ice surface and of salt aerosol is of major importance for the tropospheric chemistry. The presence of reactive bromine in the polar troposphere causes the often complete depletion of ozone in the boundary layer, and a fast oxidation of other trace species such as mercury and the biologically produced dimethyl sulfide (DMS). An oxidation product of the latter, methanesulfonic acid (MSA), and sea salt concentration from ice core records have been used as proxies to infer information about the past sea ice extent. We propose to investigate the processes related to the salt aerosol generation on the sea ice surface, the atmospheric salt transport, the halogen release, and the impact on the tropospheric composition in a joint project. Here we describe one part of this project: the remote sensing of tropospheric BrO and the analysis of source regions and transport patterns. The analysis of the sea ice parameters from remote sensing data, the development of a sea ice aerosol model and the investigation of the major ions from Neumayer station aerosol filter measurements as well as from existing ice core and snow pit records is part of a joint proposal by the University of Hamburg. The lagrangian modeling of aerosol transport and halogen chemistry is part of a parallel proposal from the MPI Mainz. The proposed joint project is embedded in the International Polar Year IPY core project "Air Ice Chemical Interactions (AICI-IPY)".

海冰是南极洲大气海盐的主要来源。这一最近的发现引发了极地冰芯记录的古气候解释范式的变化。此外，盐冰表面和盐气溶胶中活性气相卤素的释放对对流层化学具有重要意义。极地对流层中活性溴的存在往往导致边界层臭氧的完全耗尽，以及汞和生物产生的二甲基硫化物(DMS)等其他痕量物种的快速氧化。后者的氧化产物甲烷磺酸(MSA)和来自冰芯记录的海盐浓度被用作推断过去海冰范围的信息。我们建议在一个联合项目中研究与海冰表面盐气溶胶产生、大气盐分输送、卤素释放以及对对流层组成的影响有关的过程。在这里，我们描述了这个项目的一个部分：对流层BRO的遥感以及源区和输送模式的分析。根据遥感数据分析海冰参数，开发海冰气溶胶模型，调查Neumayer站气溶胶过滤测量以及现有冰芯和雪坑记录中的主要离子，是汉堡大学联合提案的一部分。气溶胶输送和卤素化学的拉格朗日模型是MPI Mainz提出的一项平行建议的一部分。拟议的联合项目嵌入国际极地年核心项目“大气冰化学相互作用(AICI-IPY)”。