Assessing Interannual Variability and Trends of Extratropical Stratosphere-Troposphere Exchange: Using a Hierarchy of Atmospheric Global Circulation Models and Measurements

评估温带平流层-对流层交换的年际变化和趋势：使用大气全球环流模型和测量的层次结构

• 批准号: 1042787
• 负责人: Gang Chen
• 金额: $ 30.98万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1042787&HistoricalAwards=false
• 关键词: Assessing; Interannual; Variability; Trends; Extratropical

This project will investigate the variability of Stratosphere-Troposphere Exchange (STE) from combined perspectives of tropospheric chemistry and atmospheric dynamics. The interannual variability of tropospheric ozone concentrations are highly impacted by El Niño/La Niña-Southern Oscillation (ENSO) and North Atlantic Oscillation (NAO) through changes in STE. Recent chemistry-climate model assessment finds that stratosphere-to-troposphere ozone flux increases significantly as a result of climate change. This work will use a synthesis of model simulations and measurements. The model simulations will use a hierarchy of atmospheric global circulation models. The simplest of these models will use idealized radiative and Sea Surface Temperature (SST) forcing and idealistic ozone-like tracers; the most complex will include realistic simulations of climate forcing with a full chemistry component in both the stratosphere and the troposphere. The investigators will (i) investigate and isolate the role of the STE in the observed and model record during recent decades using a chemistry-transport model driven by reanalysis winds; (ii) investigate and isolate various forcing mechanisms of STE in an atmospheric GCM with idealized SST and radiative forcings; and (iii) investigate the causes of the observed and simulated variability in STE in a set of self-consistent chemistry-climate model simulations with controlled SST and radiative forcings.This project will provide additional evidence for the variability and long-term trend in the stratospheric circulation and stratosphere-troposphere coupling. The STE contributions to tropospheric ozone variability have great implications for regional air quality and human health, tropospheric radiative forcing, and ecosystem productivity. The work has the potential to bridge atmospheric chemistry and atmospheric dynamics communities and foster new research directions. It will support graduate students and undergraduate research experience at Cornell University, and strengthen the collaborations among several US institutions.

该项目将从对流层化学和大气动力学的联合角度研究平流层 - 对流层交换（Ste）的变异性。对流圈臭氧浓度的年际变化受到Elniño/LaNiña-Southern振荡（ENSO）和北大西洋振荡（NAO）的高度影响。最近的化学气候模型评估发现，由于气候变化，稻草层到对流层臭氧通量显着增加。这项工作将使用模型模拟和测量的综合。模型模拟将使用大气全球循环模型的层次结构。这些模型中最简单将使用理想化的辐射和海面温度（SST）强迫和理想主义的臭氧状示踪剂。最复杂的将包括对稻草和对流层中完全化学成分的气候强迫的现实模拟。研究人员将使用由重新分析风驱动的化学 - 传输模型进行（i）调查并隔离Ste在观察到的模型中观察到的和模型记录中的作用； （ii）在具有理想化的SST和辐射强迫的大气GCM中研究并分离了Ste的各种强迫机制； （iii）研究Ste在一组具有控制的SST和辐射强迫的自洽化学气候模型模拟中观察到的和模拟变异性的原因。该项目将为平流层循环和平流层 - 对流层层层层层的差异和长期趋势提供其他证据。对流层臭氧变异性的Ste贡献对区域空气质量和人类健康，对流层辐射强迫和生态系统生产力具有很大的影响。这项工作有可能弥合大气化学和大气动态社区并培养新的研究方向。它将在康奈尔大学（Cornell University）的研究生和本科研究经验，并加强美国几个机构的合作。