Gravity Waves - Experimental Constraints, Intercomparison and Effects of the Sun

在最近的时间，它已被认识到的重力波（GWs）的垂直耦合是大气环流模式（GCMs）的主要不确定性之一，有必要对GWs在GCMs的代表性的实验约束。这项建议的第一个科学目标是提供这种约束。HIRDLS卫星仪器的数据将用于利用Ern等人（2004年）以前对CRISTA仪器采用的技术得出GW动量通量的最佳估计值。GW动量通量的气候学，以及水平和垂直波长将被导出。本提案的第二个主题是估计全球GW分布的长期变化。GW分布的大部分变化可以归因于大气背景对GW源分布的过滤。基于该近似，长期变化（例如，由于太阳的影响或准两年振荡）的全球GW分布在平流层下部将使用ERA-40大气背景条件和华纳和麦金太尔GW参数化以及全球GW射线跟踪与GROGRAT射线示踪剂估计。将结果与SABER GW方差的长期数据集进行比较。

In the recent time it has been recognized that the vertical coupling by gravity waves (GWs) is one of the major uncertainties in general circulation models (GCMs) and there is a need for experimental constraints regarding the representation of GWs in GCMs. The first scientific objective of this proposal is to provide these kind of constraints. Data of the HIRDLS satellite instrument will be used to derive best estimate values of GW momentum flux using the technique employed before by Ern et al. (2004) for the CRISTA instrument. A climatology of GW momentum flux, as well as horizontal and vertical wavelengths will be derived. The second subject of this proposal is to estimate long term variations of the global GW distribution. Large part of the variation of the GW distribution can be attributed to the filtering of the GW source distribution by the atmospheric background. Based on this approximation long term variations (e.g., due to solar influences or the quasi biennial oscillation) of the global GW distribution in the lower stratosphere will be estimated using ERA-40 atmospheric background conditions and the Warner and McIntyre GW parameterization as well as global GW ray tracing with the GROGRAT ray tracer. The results will be compared to the long-term data set of SABER GW variances.