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首页> 外文期刊>Geophysical Research Letters >UARS MLS observations of gravity waves associated with the Arctic winter stratospheric vortex
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UARS MLS observations of gravity waves associated with the Arctic winter stratospheric vortex

机译：UARS MLS观测与北极冬季平流层涡相关的重力波

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Passive satellite microwave limb radiances were used to study interactions between gravity waves and stratospheric winds in mid- to high latitude winter. We found that the radiance variances depend significantly on the instrument line-of-sight (LOS) and the background wind. The radiance variances are outstanding at two viewing angles where the LOS is about 30 degrees or 90 degrees from the wind vector. Waves propagating in preferred directions likely cause the two optimal angles observed. The variances at the 90 degrees angle, located inside the polar vortex, seem produced by the gravity waves propagating nearly parallel to the wind direction. The variances at the 30 degrees angle, located near the edge of the vortex, are likely associated with perturbations propagating almost perpendicularly to the wind direction. The variance of both modes increases with the background wind speed, but saturation is observed for the waves inside the vortex as wind speed exceeds about 60m/s. Interestingly, we also found that the temperature co-located with the variance inside the vortex is warmer by 20K at background wind speeds >60m/s, which might be correlated with the wave breaking in the vortex. [References: 11]
机译：在中高纬度冬季，被动卫星微波肢体辐射被用于研究重力波与平流层风之间的相互作用。我们发现，辐射度差异很大程度上取决于仪器的视线（LOS）和背景风。在两个视角（LOS与风矢量大约成30度或90度）时，辐射差异非常明显。沿优选方向传播的波可能会导致观察到两个最佳角度。位于极涡内部的90度角变化似乎是由几乎平行于风向传播的重力波产生的。位于旋涡边缘附近的30度角的变化可能与几乎垂直于风向传播的扰动有关。两种模式的方差都随背景风速而增加，但是当风速超过约60m / s时，在涡旋内的波中观察到饱和。有趣的是，我们还发现，在背景风速> 60m / s的情况下，与涡旋内部并列的温度升高了20K，这可能与涡旋中的波浪破裂有关。 [参考：11]

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