Comparison of Mesospheric Winds From a High-Altitude Meteorological Analysis System and Meteor Radar Observations During the Boreal Winters of 2009-2010 and 2012-2013
Comparison of Mesospheric Winds From a High-Altitude Meteorological Analysis System and Meteor Radar Observations During the Boreal Winters of 2009-2010 and 2012-2013
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DOI：
10.1016/j.jastp.2016.12.007
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发表时间：
2017-02
影响因子：
1.9
通讯作者：
J. McCormack;K. Hoppel;D. Kuhl;R. D. Wit;G. Stober;P. Espy;N. Baker;P. Brown;D. Fritts;
中科院分区：
文献类型：
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作者：
J. McCormack;K. Hoppel;D. Kuhl;R. D. Wit;G. Stober;P. Espy;N. Baker;P. Brown;D. Fritts;
我们提出了一个新的高空数值天气预报（NWP）系统在2009-2010年和2012-2013年的北方冬季在中层和低热层（MLT）的水平风的研究。该系统以海军全球环境模型（NAVGEM）的修改版为基础，其垂直范围扩大到116公里高度，再加上一个混合四维变分数据同化系统，该系统既同化对流层的标准业务气象观测数据，也同化平流层和中间层的温度、臭氧和水汽卫星观测数据。基于NAVGEM的MLT分析风使用独立的流星雷达风观测从9个不同的网站从69°N-67°S纬度进行验证。时间平均NAVGEM纬向和纬向风廓线之间的75和95公里的高度显示出良好的定性和定量的协议与相应的流星雷达风廓线。小波分析发现，3小时NAVGEM和1小时雷达风都表现出半日，日，准日变化的振幅和相位的垂直廓线也很好的一致性。小波分析还揭示了2010年1月和2013年1月主要平流层突然变暖（SSW）前后整个北方热带外区域的NAVGEM和雷达风的共同时频行为，在SSW之前的60°N中层风反转前后开始出现半日振幅减小，随后是半日振幅的放大，在中层风逆转开始后10-14天达到峰值。在这项研究中提出的初步结果表明，高空NAVGEM系统所产生的风分析准确地捕捉在这两个北方冬季期间观测到的MLT风的关键特征。
We present a study of horizontal winds in the mesosphere and lower thermosphere (MLT) during the boreal winters of 2009–2010 and 2012–2013 produced with a new high-altitude numerical weather prediction (NWP) system. This system is based on a modified version of the Navy Global Environmental Model (NAVGEM) with an extended vertical domain up to ∼116 km altitude coupled with a hybrid four-dimensional variational (4DVAR) data assimilation system that assimilates both standard operational meteorological observations in the troposphere and satellite-based observations of temperature, ozone and water vapor in the stratosphere and mesosphere. NAVGEM-based MLT analyzed winds are validated using independent meteor radar wind observations from nine different sites ranging from 69°N–67°S latitude. Time-averaged NAVGEM zonal and meridional wind profiles between 75 and 95 km altitude show good qualitative and quantitative agreement with corresponding meteor radar wind profiles. Wavelet analysis finds that the 3-hourly NAVGEM and 1-hourly radar winds both exhibit semi-diurnal, diurnal, and quasi-diurnal variations whose vertical profiles of amplitude and phase are also in good agreement. Wavelet analysis also reveals common time-frequency behavior in both NAVGEM and radar winds throughout the Northern extratropics around the times of major stratospheric sudden warmings (SSWs) in January 2010 and January 2013, with a reduction in semi-diurnal amplitudes beginning around the time of a mesospheric wind reversal at 60°N that precedes the SSW, followed by an amplification of semi-diurnal amplitudes that peaks 10–14 days following the onset of the mesospheric wind reversal. The initial results presented in this study demonstrate that the wind analyses produced by the high-altitude NAVGEM system accurately capture key features in the observed MLT winds during these two boreal winter periods.