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首页> 外文期刊>Theoretical and applied climatology >Climatology of diurnal tide and its long-term variability in the lower middle atmosphere over a tropical station
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Climatology of diurnal tide and its long-term variability in the lower middle atmosphere over a tropical station

机译：热带台站中低层大气的日潮气候及其长期变化

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ECMWF reanalysis (ERA-interim) data of winds for two solar cycles (1991-2012) are harmonically analyzed to delineate the characteristics and variability of diurnal tide over a tropical site (13.5A degrees N, 79.5A degrees E). The diurnal cycle horizontal winds measured by Gadanki (13.5A degrees N, 79.2A degrees E) mesosphere-stratosphere-troposphere (MST) radar between May 2005 and April 2006 have been used to compute 24 h tidal amplitudes and phases and compared with the corresponding results obtained from ERA winds. The climatological diurnal tidal amplitudes and phases have been estimated from surface to similar to 33 km using ERA interim data. The amplitudes and phases obtained in the present study are found to compare reasonably well with Global Scale Wave Model (GSWM-09). Diurnal tides show larger amplitudes in the lower troposphere below 5 km during summer and in the mid-stratosphere mainly during equinoctial months and early winter. Water vapor and convection in the lower troposphere are observed to play major roles in exciting 24-h tide. Correlations between diurnal amplitude and integrated water vapor and between diurnal amplitude and outgoing longwave radiation (OLR) are 0.59 and -0.34, respectively. Ozone mixing ratio correlates (rho = 0.66) well with diurnal amplitude and shows annual variation in the troposphere whereas semi-annual variation is observed at stratospheric heights with stronger peaks in equinoctial months. A clear annual variation of diurnal amplitude is displayed in the troposphere and interannual variability becomes prominent in the stratosphere which could be partly due to the influence of equatorial stratospheric QBO. The influence of solar activity on diurnal oscillations is found to be insignificant.
机译：对两个太阳周期（1991-2012年）的风的ECMWF再分析（ERA中期）数据进行谐波分析，以描绘热带站点（北纬13.5A，东经79.5A）的日潮特征和变化。用2005年5月至2006年4月由Gadanki（北纬13.5A，东经79.2A）的中层-平流层-对流层（MST）雷达测得的昼夜周期水平风计算了24小时的潮汐振幅和相位，并与相应的从ERA风获得的结果。使用ERA临时数据，已估算了从表面到大约33 km的气候日潮幅和相位。发现本研究中获得的振幅和相位可以与全球尺度波动模型（GSWM-09）进行比较。夏季和对流层中部的平流层主要在等月月份和初冬期间，日对流潮在较低的对流层中显示出较大的振幅。观测到对流层低层的水蒸气和对流在激发24小时潮汐中起主要作用。日振幅与水汽积分之间的相关性以及日振幅与长波辐射（OLR）之间的相关性分别为0.59和-0.34。臭氧混合比与日振幅密切相关（rho = 0.66），并显示出对流层的年变化，而平流层高度观测到半年变化，在等月月份峰值更强。对流层的日振幅存在明显的年际变化，平流层的年际变化也很明显，这可能部分是由于赤道平流层QBO的影响。发现太阳活动对日振荡的影响微不足道。

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