Trace gas observations for the investigation of mean age and stratospheric transport under the influence of solar variability and long term change

痕量气体观测，用于研究太阳变率和长期变化影响下的平均年龄和平流层输送

• 批准号: 5454415
• 负责人: Dr. Gabriele P. Stiller
• 金额: --
• 依托单位: IMK - Atmosphärische Spurengase und Fernerkundung
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2007-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5454415?language=en
• 关键词: Trace; gas; observations; investigation; mean

The aim of this proposal is to characterize stratospheric transport time scales and the influence of solar variability and long term change on these time scales, using observations of the age tracers CO2 and SF6 in the stratosphere. Differences between mean age derived from both tracers will be used to study the coupling between the mesosphere and the stratosphere. For this purpose we propose to use existing data sets, in combination with reanalyses of archived stratospheric whole air samples and observations performed with a new light weight balloon borne cryogenic whole air sampler. Together these data sets will cover a period starting in 1973 up to the present. By reanalyzing archived samples, it will be possible to derive high quality data of mean age for the entire period. It is planned to use this data set to characterize stratospheric transport time scales and their variability over the last 30 years under the influence of solar variability and long term change. We will also investigate the potential use of MIPAS satellite SF6 data for the retrieval of mean age. In co-operation with several modelling groups we plan to use the data for model validation and to use the models to study the effect of solar variability on stratospheric dynamics and transport time scales. In particular we want to address the following questions:- under which conditions can SF6 be used to characterize stratospheric transport time scales?- does the solar cycle influence the mesospheric chemistry of SF6 and does this lead to an artefact in SF6 based mean age determination?- Does solar variability influence stratospheric transport to the extend that this leads to changes in the mean age?- How often is mesospheric air transported into the polar vortices in significant amounts? Which dynamic process drive this effect and what is the impact of solar variability on the polar winter stratosphere?

本建议的目的是利用平流层中年龄示踪剂CO2和SF6的观测，确定平流层传输时间尺度的特征以及太阳变化和长期变化对这些时间尺度的影响。两种示踪剂得出的平均年龄之间的差异将用于研究中间层和平流层之间的耦合。为此目的，我们建议使用现有的数据集，结合重新分析存档的平流层整体空气样本和观察进行了一个新的重量轻的气球载低温整体空气采样器。这些数据集将涵盖从1973年到现在的一段时间。通过重新分析存档样本，将有可能获得整个时期平均年龄的高质量数据。计划利用这套数据来描述平流层迁移时间尺度及其在过去30年中受太阳变化和长期变化影响的变化情况。我们还将调查潜在的使用MIPAS卫星SF6数据的平均年龄的检索。在与几个建模小组合作，我们计划使用的数据进行模型验证，并使用模型来研究太阳的变化对平流层动力学和运输时间尺度的影响。特别是，我们要解决以下问题：-在什么条件下可以SF6被用来表征平流层传输时间尺度？-太阳活动周期是否会影响SF6的中间层化学成分，这是否会导致基于SF6的平均年龄测定中的人为现象？太阳的变化是否影响平流层的输送，以至于导致平均年龄的变化？中层空气大量输送到极地涡旋的频率有多高？是什么动力过程驱动了这种效应？太阳变化对极地冬季平流层的影响是什么？