Using TRMM Latent Heat as a Source to Estimate Convection Induced Gravity Wave Momentum Flux in the Lower Stratosphere
Using TRMM Latent Heat as a Source to Estimate Convection Induced Gravity Wave Momentum Flux in the Lower Stratosphere
复制标题
使用 TRMM 潜热作为源估算平流层下部对流引起的重力波动量通量
DOI：
10.1029/2021jd035785
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Bacmeister, Julio
中科院分区：
文献类型：
--
作者：
Liu, Chuntao;Alexander, Joan;Richter, Jadwiga;Bacmeister, Julio
由于观测资料的缺乏，由对流产生的重力波向平流层低层输送的动量通量是一个很大的挑战。这限制了我们对平流层大气环流动力学和准两年振荡模拟的真实性的理解。在过去的十年中，一些大气环流模式将动量通量与次网格尺度对流降水的潜热联系起来，取得了一定的成功。然而，这些模式中的次网格尺度对流来源仍存在很大的不确定性。本文将动量通量与对流潜热之间的联系直接应用于热带和副热带地区16年TRMM降水雷达观测的对流降水。利用TRMM谱潜热产品和ERA-临时数据集的大尺度风廓线计算了100hPa100 hpa的总动量通量和方向动量通量。我们首次从观测到的对流源估计了热带和副热带100百帕动量通量的地理分布。给出并讨论了导出动量通量的日变化、季节变化和年际变化。这些结果可为验证大气环流模式中热带对流层和平流层之间的动力耦合提供参考。
Due to a lack of observations, it is a big challenge to quantify the momentum flux transported from the troposphere into the lower stratosphere by gravity waves generated by convection. This limits our understanding of the dynamics of general circulation in the stratosphere and the realism of simulations of the Quasi Biennial Oscillation. In the past decade, some general circulation models have linked the momentum flux to the latent heating from subgrid scale convective precipitation with some success. However, there is still a large uncertainty in the sources of subgrid scale convection in these models. This study applies the links between the momentum flux and convective latent heating directly to the convective precipitation derived from 16 years of TRMM precipitation radar observations in the tropics and subtropics. The total and directional momentum flux at 100 hPa are derived at individual convective pixels by using the TRMM Spectrum Latent Heating product and large‐scale wind profiles from the ERA‐Interim dataset. For the first time, we are able to estimate the geographical distribution of momentum flux at 100 hPa in tropics and subtropics from the observed convective sources. The diurnal, seasonal, and interannual variations of the derived momentum flux are presented and discussed. These results could provide a reference to validate the dynamic coupling between the tropical troposphere and the stratosphere in the general circulation models.
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影响因子：
3.1
作者：
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影响因子：
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DOI：
--
发表时间：
2020
期刊：
影响因子：
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作者：
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影响因子：
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作者：
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影响因子：
8.9
作者：
D. Parker;R. Burton;A. Diongue‐Niang;R. Ellis;M. Felton;C. Taylor;C. Thorncroft;P. Bessemoulin;A. Tompkins
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