Collaborative Research: Convective Gravity Waves in the Stratosphere (CGWaveS)

合作研究：平流层对流重力波（CGWaveS）

• 批准号: 2017270
• 负责人: Melville Nicholls
• 金额: $ 50.96万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-01-01 至 2022-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2017270&HistoricalAwards=false
• 关键词: Collaborative; Research; Convective; Gravity; Waves

Gravity waves in the atmosphere occur when a parcel of air is lifted, usually by terrain or updrafts in thunderstorms, and then gravity serves as a force to try to restore the parcel to an equilibrium state. The waves occur as the parcel overshoots its equilibrium point, rising or sinking because of its own momentum. Gravity waves play a large role in the atmosphere due to their ability to affect circulation patterns. This award is for the study of thunderstorm-induced gravity waves in the lower to middle atmosphere, using a research aircraft and remote sensing instruments. The observations will be combined with state-of-the-art numerical models to improve understanding of gravity waves and provide guidance for improving their representation in weather and climate models. The project will provide training opportunities for a number of students and early career researchers and public outreach will be conducted during a facility day and K-12 school visits.The collaborative research team will conduct a field campaign and associated modeling effort to increase understanding of convective gravity wave (CGW) dynamics and their role in atmospheric circulation, structure, and variability from Earth’s surface to the stratopause and above. Gravity waves that are generated by deep convection have not previously been quantified by full-column measurements. The CGWaveS field campaign will be conducted in the central US in June 2022 using the NSF/NCAR G-V research aircraft. The G-V will make in situ measurements using tracers of vertical transport and mixing and remote sensing measurements of radial winds from 15-25km using a Na resonance lidar and temperature and perturbations from 25-60km via a Rayleigh lidar. OH airglow measurements at 85km will provide additional data about the atmospheric structure. Multiple numerical models will be used, including the WRF in idealized and real-case configurations, the GATS Complex Geometry Compressible Atmosphere Model (CGCAM) and ERAU Model for Acoustic-Gravity wave Interactions and Coupling (MAGIC) for CGW responses extending throughout the stratosphere, and the GATS spectral DNS models that can resolve instabilities and turbulence. The measurement campaign and analysis and modeling efforts would focus on four main science goals: 1) Measure and quantify CGW generation, propagation, and variability throughout the troposphere and stratosphere, 2) Identify and quantify the convective source dynamics that dictate CGW character and orientations for a variety of source conditions, 3) Quantify CGW refraction in variable winds, breaking and instability dynamics, mean-flow interactions, and their effects in the stratosphere for a range of environments, and 4) Advance the parameterizations of both CGW generation by WSR-88D measurements and the resulting CGW nonlinear dynamics and influences in the troposphere and stratosphere.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

大气中的重力波发生在一团空气被抬升时，通常是通过地形或雷暴中的上升气流，然后重力作为一种力试图将该团恢复到平衡状态。 当包裹超过它的平衡点时，波就发生了，因为它自己的动量而上升或下沉。 重力波在大气中起着重要作用，因为它们能够影响环流模式。 该奖项是为了奖励使用研究飞机和遥感仪器研究雷暴引起的中低层大气重力波。 观测结果将与最先进的数值模型相结合，以提高对重力波的理解，并为改进其在天气和气候模型中的表现提供指导。 该项目将为一些学生和早期职业研究人员提供培训机会，并将在设施日和K-12学校访问期间进行公众宣传。合作研究团队将进行实地活动和相关建模工作，以增加对对流重力波（CGW）动力学及其在大气环流，结构，以及从地球表面到平流层顶及以上的变化。 由深对流产生的重力波以前没有被全柱测量量化。 CGWaveS现场活动将于2022年6月在美国中部使用NSF/NCAR G-V研究飞机进行。 G-V将使用垂直传输和混合示踪剂进行现场测量，并使用钠共振激光雷达对15- 25公里的径向风进行遥感测量，并通过瑞利激光雷达对25- 60公里的温度和扰动进行遥感测量。在85公里处的OH气辉测量将提供有关大气结构的额外数据。 将使用多种数值模式，包括理想化和实际情况配置的WRF、《服务贸易总协定》复杂几何可压缩大气模式（CGCAM）和ERAU声学-重力波相互作用和耦合模式（MAGIC），用于整个平流层的CGW响应，以及可解决不稳定性和湍流的《服务贸易总协定》频谱DNS模式。 测量活动以及分析和建模工作将侧重于四个主要科学目标：1）测量和量化对流层和平流层中CGW的产生、传播和变化，2）识别和量化对流源动力学，该对流源动力学决定了各种源条件下CGW的特征和方向，3）量化可变风、断裂和不稳定动力学中的CGW折射，平均流的相互作用，以及它们在平流层中对一系列环境的影响，4）提出了WSR生成CGW的参数化方法。该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的智力价值和更广泛的影响审查标准。