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首页> 外文期刊>Geophysical Research Letters >Low latitude 2-day planetary wave impact on austral polar mesopause temperatures: revealed by a January diminution in PMSE above Davis, Antarctica
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Low latitude 2-day planetary wave impact on austral polar mesopause temperatures: revealed by a January diminution in PMSE above Davis, Antarctica

机译：低纬度2天行星波对南极极地绝经温度的影响：南极戴维斯上方PMSE的1月份减小显示

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摘要

A new characteristic of the austral summer polar mesopause as revealed by ground-based radar and satellite temperature measurements is reported, that is linked to inter-annual variability of the low-latitude easterly wind jet.Four consecutive seasons of polar mesosphere summer echoes (PMSE) and mesosphere temperature observations above Davis, Antarctica (68.6°S) show a mid-January diminution in PMSE occurrence rate that coincides with a minor mesopause warming of several degrees. Spectral analyses of PMSE, Aura Microwave Limb Sounder (MLS)temperatures and radar meridional winds show the presence of -4-5-day planetary waves (PWs) throughout the austral summer in the polar upper mesosphere together with enhanced ～2-day PW activity from mid-January to mid-February. Analysis of MLS temperatures show that the ～2-day PWs have zonal wavenumbers (S) with both westward (S = -2, -3) and eastward (S = +2, +3)components. Although displaying some inter-annual variation in the peak onset time, the mid-January mesopause warming coincides with a weakening of the equatorward meridional wind above Davis and enhancement of low-latitude 2-day PW activity.
机译：据报道，通过地面雷达和卫星温度测量揭示了夏季南极极地绝经的新特征，这与低纬度东风气流的年际变化有关。连续四个季节的极地中层夏季回波（PMSE） ）和南极戴维斯（68.6°S）上方的中层温度观测结果显示，一月中旬PMSE发生率降低，与中度更年期的轻微升温相吻合。对PMSE，Aura微波探空仪（MLS）温度和雷达子午风的光谱分析表明，整个极地中层中层夏季整个南半球夏季都存在-4-5天的行星波（PWs），同时〜2天的PW活动增强从1月中旬到2月中旬。对MLS温度的分析表明，〜2天PW具有向西（S = -2，-3）和向东（S = +2，+3）分量的纬向波数（S）。尽管在一月中旬高峰期出现了一些年际变化，但一月中旬的更年期变暖与戴维斯上方的赤道子午风减弱以及低纬度两天PW活动增强有关。

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