GRACILE: a comprehensive climatology of atmospheric gravity wave parameters based on satellite limb soundings
GRACILE: a comprehensive climatology of atmospheric gravity wave parameters based on satellite limb soundings
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DOI：
10.5194/essd-10-857-2018
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发表时间：
2018-04-27
影响因子：
11.4
通讯作者：
Riese, Martin
中科院分区：
文献类型：
--
作者：
Ern, Manfred;Quang Thai Trinh;Riese, Martin
重力波是大气动力学的主要驱动力之一。然而，大多数全球大气模型的空间分辨率太粗糙，无法正确分辨小尺度的重力波，这些重力波的水平范围从几十到几千公里，垂直范围从不到1公里到几十公里。重力波源过程涉及更小的尺度。因此，大气环流模式（GCMs）和化学气候模式（CCM）通常将重力波对全球环流的影响参数化。这些参数化非常简单。为此，与全球观测的重力波的比较是必要的参数化的改进和减轻的模式bias.We提出了一个重力波气候学的基础上观测卫星（GRACILE）的大气红外临边辐射。GRACILE是由红外线临边探测卫星仪器高分辨率动力学临边探测器和宽带发射辐射测量大气探测仪观测到的平流层和中间层重力波分布全球数据集。提供了重力波垂直波长和沿轨迹水平波数的典型分布（纬向平均值和全球地图），以及重力波温度方差、势能和绝对动量通量。这一全球数据集反映了这些参数的典型季节变化及其空间变化。GRACILE数据集适用于科学研究，可用于与其他仪器（地面、机载或其他卫星仪器）进行比较，并与大气环流模型和集束弹药模型中的重力波分布进行比较，无论是解析的还是参数化的。GRACILE数据集作为补充数据可在https://doi.org/10.1594/PANGAEA.879658上获得。
Gravity waves are one of the main drivers of atmospheric dynamics. The spatial resolution of most global atmospheric models, however, is too coarse to properly resolve the small scales of gravity waves, which range from tens to a few thousand kilometers horizontally, and from below 1 km to tens of kilometers vertically. Gravity wave source processes involve even smaller scales. Therefore, general circulation models (GCMs) and chemistry climate models (CCMs) usually parametrize the effect of gravity waves on the global circulation. These parametrizations are very simplified. For this reason, comparisons with global observations of gravity waves are needed for an improvement of parametrizations and an alleviation of model biases.We present a gravity wave climatology based on atmospheric infrared limb emissions observed by satellite (GRACILE). GRACILE is a global data set of gravity wave distributions observed in the stratosphere and the mesosphere by the infrared limb sounding satellite instruments High Resolution Dynamics Limb Sounder (HIRDLS) and Sounding of the Atmosphere using Broadband Emission Radiometry (SABER). Typical distributions (zonal averages and global maps) of gravity wave vertical wavelengths and along-track horizontal wavenumbers are provided, as well as gravity wave temperature variances, potential energies and absolute momentum fluxes. This global data set captures the typical seasonal variations of these parameters, as well as their spatial variations. The GRACILE data set is suitable for scientific studies, and it can serve for comparison with other instruments (ground-based, airborne, or other satellite instruments) and for comparison with gravity wave distributions, both resolved and parametrized, in GCMs and CCMs. The GRACILE data set is available as supplementary data at https://doi.org/10.1594/PANGAEA.879658.