Untersuchung der langjährigen, interannualen Variabilität von Staubstürmen im Hinblick auf geomorphologische, biologische und meteorologische Kontrollmechanismen an Hand von Beobachtungen und Modellsimulationen

利用观测和模型模拟研究沙尘暴在地貌、生物和气象控制机制方面的长期、年际变化

• 批准号: 144058785
• 负责人: Professorin Dr. Kerstin Schepanski
• 金额: --
• 依托单位: Canada Research Chair, Climate, Resources and Global Change (aufgelöst)
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/144058785?language=en
• 关键词: Untersuchung; der; langj; hrigen; interannualen

Airborne mineral dust is an important player in our environment on local and global scales. However, our knowledge on source areas and their activity is limited. The spatiotemporal distribution of occurrences of dust storms that emit large amounts of mineral dust into the atmosphere is controlled by surface properties and atmospheric conditions. Changes in the atmosphere or the ecologic and geomorphologic environment lead to changing conditions for dust emission and thereby to variations in dust storm occurrence. In the proposed research, time-series of observed active dust sources from remote sensing and reports from weather stations will be analysed with respect to interannual variability and changes in environmental conditions affecting dust emissions. In addition, an off-line dust emission model driven by atmospheric reanalysis fields will be used to evaluate the effect of a changing environment on the regional occurrence of dust storms. The study will focus on North Africa and North America areas in which dust storm activities vary considerably from year-to-year. Understanding the interannual controls on dust emission will help to improve seasonal dust storm forecasts as well as predict changes in dust storm activities in a changing climate.

空气中的矿物粉尘是一个重要的球员在我们的环境在当地和全球范围内。然而，我们对源区及其活动的了解是有限的。沙尘暴向大气中排放大量矿物粉尘，其时空分布受地表特性和大气条件的控制。大气或生态地貌环境的变化，导致沙尘暴发生条件的变化，从而引起沙尘暴发生的变化。在拟议的研究中，将分析从遥感和气象站报告中观测到的活跃灰尘源的时间序列，以了解影响灰尘排放的环境条件的年际变化和变化。此外，还将使用一个由大气再分析场驱动的离线沙尘排放模式来评估不断变化的环境对沙尘暴区域发生的影响。这项研究将侧重于沙尘暴活动每年变化很大的北非和北美地区。了解沙尘排放的年际控制将有助于改善季节性沙尘暴预报，以及在气候变化中预测沙尘暴活动的变化。