Collaborative Reasearch: CEDAR--Gravity Wave Momentum Fluxes and Instability Studies Using Coupled Lidar, Temperature Mapper and Modeling Studies at ALOMAR and Cerra Pachon

合作研究：CEDAR——在 ALOMAR 和 Cerra Pachon 使用耦合激光雷达、温度测绘仪和建模研究进行重力波动量通量和不稳定性研究

• 批准号: 1259136
• 负责人: David Fritts
• 金额: $ 11.78万
• 依托单位: GLOBAL ATMOSPHERIC TECHNOLOGIES AND SCIENCES, INC.
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-07-15 至 2014-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1259136&HistoricalAwards=false
• 关键词: Collaborative; Reasearch; CEDAR; Gravity; Wave

The investigators will conduct comprehensive experimental studies aimed at quantifying gravity wave (GW) momentum transport and the GW instability dynamics that drive energy and momentum deposition and energy transfers in the mesosphere and lower thermosphere (MLT). GWs having small horizontal scales and large amplitudes and momentum fluxes provide the majority of the mean and variable forcing in the MLT, and these vary significantly in space and time. Understanding of this forcing and variability is highly uncertain, but it is extremely important for parameterization of such dynamics in large-scale modeling of the MLT, and throughout the atmosphere. The same parameterization needs are also critical for general circulation models (GCMs), climate models, and numerical weather prediction (NWP) models in related fields. To quantify these GW and instability dynamics and their mean and variable forcing as fully as possible, the investigators will employ instrument suites at the only two sites able to define these dynamics in the most complete and quantitative manner. Low-latitude measurements will use the comprehensive instrumentation of the new Cerro Pachon Observatory in Chile (30°S); high-latitude measurements will employ the even more extensive suite of instrumentation at the ALOMAR observatory in northern Norway (69°N).These instrument suites permit the most complete, and redundant, specification of the GW, instability, and mean parameters needed to quantify GW amplitudes, momentum fluxes, and instability dynamics at any site. The recognized role of GWs in driving the mean and variable structure of the MLT makes an understanding of their various contributions, and an ability to model their effects, a high priority. These dynamics also influence a wide range of other processes ranging from tidal and planetary wave structures and dynamics to minor species transport. The need to describe such effects accurately also has broader implications for modeling climate change, responses to variable solar forcing, and Space Weather.

研究人员将进行旨在量化重力波（GW）动量转运的全面实验研究以及驱动中层和下热层（MLT）中能量和动量沉积和能量转移的GW不稳定性动力学。具有较小的水平尺度和大放大器和动量通量的GW提供了MLT中的大部分平均值和可变强度，并且它们在时空和时间上有很大差异。了解这种强迫和可变性是高度不确定的，但是对于MLT的大规模建模和整个大气中的这种动力学的参数化非常重要。相同的参数化需求对于一般循环模型（GCM），气候模型和数值天气预测（NWP）模型也至关重要。为了量化这些GW和不稳定性动力学及其平均值和可变强迫，研究人员将在只有两个地点使用仪器套件可以以最完整和定量的方式定义这些动力学。低纬度测量将使用智利新的Cerro Pachon天文台的综合仪器（30°S）；高纬度测量将在挪威北部（69°N）的Alomar观察中采用更广泛的仪器套件。这些仪器套件允许在任何站点量化GW放大器，动量通量和不稳定性动力学所需的黄金周，不稳定性和平均参数的最完整，最冗余。 GWS在推动MLT的平均值和可变结构中的公认作用使他们了解了它们的各种贡献，并具有建模其效果的能力，即高优先级。这些动态还影响了从潮汐和行星波结构和动力学到次要物种运输的广泛其他过程。准确地描述这种效果的需求也对建模气候变化，对可变太阳能强迫的响应和空间天气具有更广泛的影响。