Structure and processes of the upper troposphere and lower stratosphere, and their sensitivity to changes in atmospheric CO2 concentrations

对流层上层和平流层下层的结构和过程及其对大气二氧化碳浓度变化的敏感性

• 批准号: NE/D009510/1
• 负责人: Stephan Fueglistaler
• 金额: $ 50.29万
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Fellowship
• 财政年份: 2007
• 资助国家: 英国
• 起止时间: 2007 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FD009510%2F1
• 关键词: Structure; processes; upper; troposphere; lower

The separation of troposphere and stratosphere is traditionally based on criteria of the vertical temperature structure, with a sharp tropopause at an altitude of about 10 km, that bulges steeply upward over the subtropics to an altitude of about 17 km over the tropics. However, other characteristics such as radiative properties or correlations of trace gas concentrations suggest a more gradual transition over a vertical layer extending from the upper troposphere (UT) into the lower stratosphere (LS). The structure of the UT/LS is determined both by tropospheric and stratospheric processes, and may be sensitive to changes in atmospheric carbon dioxide concentrations. Conversely, changes in the UT/LS may have a strong feedback on climate. The proposed project will help to improve our understanding of the processes that control the UT/LS structure in order to provide improved predictions of how this layer changes in a changing climate, and how the changes in this layer may have an impact on climate. To this end, we will make use of space-borne atmospheric observations, as well as of in-situ observations from instruments onboard of high flying aircrafts. The analysis of these observations will help to formulate hypotheses, which will be tested with the help of large-scale numerical models, ranging in complexity from primitive equation models to coupled chemistry/climate models.

对流层和平流层的分离在传统上是基于垂直温度结构的标准，在约10 km的高度上具有尖锐的对流层顶，在亚热带上陡峭地向上膨胀至热带地区约17 km的高度。但是，其他特征（例如辐射特性或痕量气体浓度的相关性）表明，垂直层从对流层上部（UT）延伸到下层平流层（LS）。 UT/LS的结构既通过对流层和平流层过程，并且可能对大气二氧化碳浓度的变化敏感。相反，UT/LS的变化可能对气候有很大的反馈。拟议的项目将有助于提高我们对控制UT/LS结构的过程的理解，以改善对该层在不断变化的气候变化以及该层中该层的变化如何影响气候的预测。为此，我们将利用太空传播的大气观测以及高空飞机上仪器的原地观察。这些观察结果的分析将有助于提出假设，该假设将在大规模数值模型的帮助下进行测试，从原始方程模型到耦合化学/气候模型的复杂性范围。

项目成果

Sensitivity of stratospheric Br<sub>y</sub> to uncertainties in very short lived substance emissions and atmospheric transport

平流层 Br 的灵敏度

• DOI: 10.5194/acp-11-1379-2011
• 发表时间: 2011
• 期刊: Atmospheric Chemistry and Physics
• 影响因子: 6.3
• 作者: Schofield R

The annual cycle in lower stratospheric temperatures revisited

• DOI: 10.5194/acp-11-3701-2011
• 发表时间: 2010-11
• 期刊: Atmospheric Chemistry and Physics
• 影响因子: 6.3
• 作者: S. Fueglistaler;P. Haynes;P. Forster

Insight from ozone and water vapour on transport in the tropical tropopause layer (TTL)

• DOI: 10.5194/acp-11-407-2011
• 发表时间: 2010-10
• 期刊: Atmospheric Chemistry and Physics
• 影响因子: 6.3
• 作者: F. Ploeger;S. Fueglistaler;J. Grooß;G. Günther;P. Konopka;Y. Liu;R. Müller;F. Ravegnani;C. Schiller;A. Ulanovski;M. Riese

A low-level circulation in the tropics

• DOI: 10.1175/2007jas2463.1
• 发表时间: 2008-03
• 期刊: Journal of the Atmospheric Sciences
• 影响因子: 3.1
• 作者: I. Folkins;S. Fueglistaler;G. Lesins;T. Mitovski