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Seasonal Variations of Global Stratospheric Gravity Wave Activity Revealed by COSMIC RO Data

机译：宇宙RO数据揭示的全局平流层重力波活动的季节变化

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Seasonal variations of gravity waves over the globe in the stratosphere are investigated using radio occultation data from the Constellation Observing System for Meteorology, Ionosphere and Climate mission from September 2006 to June 2016. The global distributions of 10-year averaged seasonal means of gravity waves indicate that potential energy is large over tropical and subtropical latitudes (30°S-30°N) in all seasons, as well as over middle and high latitudes in winter hemisphere. Gravity wave potential energy and the outgoing longwave radiation (OLR) which is a proxy for deep convection are negative correlated at equatorial latitudes. This suggests that convection is the primary source of gravity waves in the Tropics. At 50°N and 50°S, gravity waves are mainly generated by the diverse terrains of mountains, and either propagate upward or are filtered out under the effect of background zonal wind. Intense eastward wind, which mainly happens in winter hemisphere, makes great contributions to the upward propagation of gravity waves, while 0 m/s wind level, which is apparent in summer hemisphere, filters out most of the gravity waves. This can explain the seasonal variations of gravity waves at middle and high latitudes.
机译：使用来自2006年9月至2016年6月的气象，电离层和气候任务的星座观测系统的无线电枢化数据研究了平流层中全球的季节性变化。全球10年的平均季节性引力波的全球分布表明在所有季节的热带和亚热带纬度（30°S-30°N）以及冬季半球的中间和高纬度地区，潜在的能量大。作为深度对流的代理的重力波势能和输出长波辐射（OLR）在赤道纬度地区是负相关的。这表明对流是热带地区的重力波主要源。在50°N和50°S处，重力波主要由山脉的各种地带产生，并且向上传播或在背景Zonal风的效果下滤出。激烈的东风，主要发生在冬季半球，对重力波的向上传播产生了巨大贡献，而夏季半球在0米/秒的风电位中显而易见，过滤出大部分重力波。这可以解释中高纬度的重力波的季节变化。

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