Transport timescales and halogen budget in the Arctic polar Vortex and the UTLS during HALO-ASCCI

HALO-ASCCI 期间北极涡旋和 UTLS 的传输时间尺度和卤素预算

• 批准号: 522325798
• 负责人: Professor Dr. Andreas Engel
• 金额: --
• 依托单位: Institut für Atmosphäre und Umwelt (IAU)
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/522325798?language=en
• 关键词: Transport; timescales; halogen; budget; Arctic

The project ASCCI is a HALO mission in the Northern Hemisphere polar late winter to early spring to study ozone in the Arctic lowermost stratosphere and upper troposphere. The scientific background of the ASCCI campaign is described in the campaign co-ordination proposal by the same applicant (Andreas Engel) and Björn-Martin Sinnhuber (KIT Karlsruhe). Here we focus specifically on aspects related to the work proposed at University Frankfurt in relation to the ASCCI campaign. University Frankfurt operates an in-situ gas chromatograph with electron capture (GC-ECD) and with mass spectrometric (GC-MS) detection. The instrument is capable of measuring a wide suite of halocarbons, using both Electron Impact (EI) and Negative Chemical Ionization (NCI), and also the mean age tracer SF6. We focus on aspects related to halocarbons, their atmospheric distribution, on total halogen loading of the atmosphere, available chlorine and bromine in the stratosphere and on aspects of mean age of air, specifically for the polar winter conditions to be investigated during ASCCI. The main research question we will adress within this proosal are: - how has the atmospheric chlorine budget chenged in comparison to the winter 2015/2016 when the last Arctic polar winter campaign with HALO was performed. - how has the atmospheric bromine budget chenged in comparison to the winter 2015/2016 when the last Arctic polar winter campaign with HALO was performed - what are typical transport times (mean age of air) in the lower stratosphere using a new and improved method to determine mean age? - How do chlroine and bromine budgets and also mean age compare to the Southern Hemisphere distributions, in particular if data are comared in a vortex-relative coordinate system?

ASCCI项目是在北方半球极区的冬末至早春进行的一项HALO使命，目的是研究北极平流层最低层和对流层上部的臭氧。ASCCI活动的科学背景在同一申请人（Andreas Engel）和Björn-Martin Sinnhuber（KIT Karlsruhe）的活动协调提案中进行了描述。在这里，我们特别关注的方面提出的工作在法兰克福大学在ASCCI运动。法兰克福大学运行一台带有电子捕获（GC-ECD）和质谱（GC-MS）检测的原位气相色谱仪。该仪器能够使用电子轰击（EI）和负化学电离（NCI）以及平均年龄示踪剂SF6测量各种卤代烃。我们专注于有关方面的卤代烃，其大气分布，在大气中的总卤素负载，有效的氯和溴在平流层和空气的平均年龄方面，特别是极地冬季条件ASCCI期间进行调查。我们将在本项目中解决的主要研究问题是：-与2015/2016年冬季相比，大气氯预算如何变化，当时进行了最后一次北极极地冬季活动。 - 与2015/2016年冬季相比，大气溴预算发生了怎样的变化，当时进行了最后一次北极极地冬季活动，使用新的和改进的方法来确定平均年龄，平流层下部的典型传输时间（空气的平均年龄）是多少？- 氯和溴的收支以及平均年龄与南半球的分布相比如何，特别是如果数据是在涡旋相对坐标系中比较的话？