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首页> 外文期刊>Annales Geophysicae >Characteristics of gravity waves generated in a convective and a non-convective environment revealed from hourly radiosonde observation under CPEA-II campaign
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Characteristics of gravity waves generated in a convective and a non-convective environment revealed from hourly radiosonde observation under CPEA-II campaign

机译：在CPEA-II战役中每小时进行的探空仪观测揭示了在对流和非对流环境中产生的重力波的特征

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Analyses of hourly radiosonde data of temperature, wind, and relativehumidity during four days (two with convection and two with no convection)as a part of an intensive observation period in CPEA-2 campaign over KotoTabang (100.32° E, 0.20° S), Indonesia, are presented.Characteristics of gravity waves in terms of dominant wave frequencies atdifferent heights and their vertical wavelengths are shown in the lowerstratosphere during a convective and non-convective period. Gravity waves withperiods ~10 h and ~4–5 h were found dominant neartropopause (a region of high stability) on all days ofobservation. Vertical propagation of gravity waves were seen modified nearheights of the three identified strong wind shears (at ~16, 20, and25 km heights) due to wave-mean flow interaction. Between 17 and 21 kmheights, meridional wind fluctuations dominated over zonal wind, whereas from22 to 30 km heights, wave fluctuations with periods ~3–5 h and~8–10 h in zonal wind and temperature were highly associated,suggesting zonal orientation of wave propagation. Gravity waves fromtropopause region to 30 km heights were analyzed. In general, verticalwavelength of 2–5 km dominated in all the mean-removed (~ weekly mean)wind and temperature hourly profiles. Computed vertical wavelength spectraare similar, in most of the cases, to the source spectra (1–16 km height)except that of zonal wind spectra, which is broad during active convection.Interestingly, during and after convection, gravity waves with shortvertical wavelength (~2 km) and short period (~2–3 h)emerged, which were confined in the close vicinity of tropopause, and werenot identified on non-convective days, suggesting convection to be the sourcefor them. Some wave features near strong wind shear (at 25 km height) werealso observed with short vertical wavelengths in both convective andnon-convective days, suggesting wind shear to be the sole cause of generationand seemingly not associated with deep convection below. A drop in thetemperature up to ~4–5 K (after removal of diurnal component) wasobserved at ~16 km height near a strong wind shear (~45–55 m s?1 km?1) during active period of convection.
机译：在CPEA-2对KotoTabang（100.32°E，0.20°S）进行的密集观测期的一部分，分析了四天（两对流和两对不对流）中四天的温度，风和相对湿度的每小时探空数据，在对流和非对流期间，平流层下部的引力波以不同高度的优势波频率及其垂直波长为特征。在观察的所有天中，发现重力波约为10 h和〜4-5 h，是主要的近层顶乳（高度稳定的区域）。由于波均流相互作用，可以看到重力波的垂直传播改变了三个已确定的强风切变的高度（分别为〜16、20和25 km）。在17至21 kmh的高度上，子午风起伏主要集中在纬向风，而在22至30 km的高度上，纬向风和温度在〜3–5 h和〜8–10 h期间的波浪起伏高度相关，这表明波浪的纬向取向传播。分析了从对流层顶区域到30 km高的重力波。一般而言，在所有平均去除（〜每周平均）风和温度小时剖面中，垂直波长为2–5 km。在大多数情况下，计算出的垂直波长光谱与源光谱（1–16 km高度）相似，但纬向风光谱的光谱在主动对流过程中较宽。有趣的是，在对流期间和之后，短波重力波（约2 km）和短时（〜2–3 h）出现在对流层顶附近，并且在非对流日未被发现，表明对流是它们的来源。在对流和非对流日，在短垂直波长处也观察到强风切变附近的一些波浪特征（高度为25 km），这表明风切变是产生的唯一原因，似乎与下面的深对流无关。在强风切变附近（〜45–55 ms ？1 km ？1），在〜16 km高度处观察到温度下降了约4-5 K（去除了昼夜成分）。 ）。

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