Middle Atmosphere NOx variations and solar UV VAriability: Examples to study mesospheric/stratospheric coupling and the impact of solar variability on stratospheric ozone

中层大气氮氧化物变化和太阳紫外线变化：研究中层/平流层耦合以及太阳变化对平流层臭氧影响的示例

• 批准号: 5454133
• 负责人: Dr. Thomas Reddmann
• 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 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5454133?language=en
• 关键词: Middle; Atmosphere; NOx; variations; solar

A unique record of spectral radiance measurements has been provided by the instrument MIPAS on-board the ENVISAT satellite which covers the lower stratosphere up to the lower mesosphere globally and in particular the polar night regions. The first two years of its operation encompassed phases of varying solar activity including the solar storm in October 2003. From these observations the chemical effects of increased stratospheric NOx values, especially on ozone depletion, and the contribution to the NOy budget has been assessed by comparing MIPAS observations and the results of the KASIMA model. During the third phase of the project the data basis will be extended by providing up to present observations using the reduced resolution mode of the instrument, by filling gaps in the time and spatial coverage of the data, and by adapting and developing retrieval techniques. Using the extended data set the role of solar proton events compared to auroral activity for NOx production and the dependence on the dynamic situation during polar winters ruling downward transport will be analysed for more meteorological, solarphysical and geomagnetical situations using data analysis and model simulations. As a model inter-comparison undertaken during the second funding period showed major deficits in the understanding of the build-up of HNO3 and ClONO2 during SPEs, related NOx, HOx and chlorine chemistry will be studied by detailed observation and model simulations. In close co-operation with other CAWSES partners the project aims to contribute to the improvement of chemical climate models with respect to their capability to simulate natural forcings as solar variability.

ENVISAT卫星上的MIPAS仪器提供了光谱辐射测量的独特记录，该仪器覆盖全球平流层下层至中间层下层，特别是极地夜间地区。它运行的头两年包括不同阶段的太阳活动，包括2003年10月的太阳风暴。通过比较MIPAS的观测结果和KASIMA模式的结果，从这些观测结果中评估了平流层NOx值增加的化学效应，特别是对臭氧消耗的影响，以及对NOy预算的贡献。在项目的第三阶段，数据基础将得到扩展，办法是利用仪器的低分辨率模式提供到目前为止的观测结果，填补数据在时间和空间覆盖方面的空白，以及调整和发展检索技术。利用扩展的数据集，与极光活动相比，太阳质子事件对氮氧化物产生的作用，以及对极地冬季控制向下输送的动态情况的依赖，将通过数据分析和模型模拟，在更多的气象、太阳物理和地磁情况下进行分析。由于在第二个资助期内进行的模型相互比较表明，在了解SPEs期间HNO3和ClONO2的积累方面存在重大缺陷，因此将通过详细观察和模型模拟来研究相关的NOx， HOx和氯化学。在与其他CAWSES伙伴的密切合作下，该项目旨在促进化学气候模式的改进，提高其模拟太阳变率等自然强迫的能力。

项目成果

Atmospheric effects of energetic particle precipitation in the Arctic winter 1978–1979 revisited

重新审视 1978 年至 1979 年北极冬季高能粒子降水的大气影响

• DOI: 10.1029/2011jd016663
• 发表时间: 2012
• 期刊: Journal of Geophysical Research
• 作者: L. A. Holt;C. E. Randall;V. L. Harvey;E. E. Remsberg;G. P. Stiller;B. Funke;P. F. Bernath;K. A. Walker
• 通讯作者: K. A. Walker