Nocturnal thermal structure of the mesosphere and lower thermosphere region at Maui, Hawaii (20.7°N), and Starfire Optical Range, New Mexico (35°N) : Mesospheric Dynamic and Thermodynamic Studies
Nocturnal thermal structure of the mesosphere and lower thermosphere region at Maui, Hawaii (20.7°N), and Starfire Optical Range, New Mexico (35°N) : Mesospheric Dynamic and Thermodynamic Studies
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DOI：
10.1029/2004jd004891
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发表时间：
2005-05
影响因子：
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通讯作者：
X. Chu;C. Gardner;S. Franke
中科院分区：
文献类型：
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作者：
X. Chu;C. Gardner;S. Franke
利用Na激光雷达观测资料，对新墨西哥州星火光学靶场（SOR）（35.0°N，106.5°W）和夏威夷毛伊岛（20.7°N，156.3°W）的中层和低热层（MLT）夜间热结构进行了特征分析。这两个地点都显示出MSIS-00模式没有预测到的85至100公里之间的中间层逆温层。毛伊岛MIL的振幅（105.8 K）约为SOR（109.8 K）的一半，毛伊岛MIL的宽度（1011.1 km）小于SOR MIL（1014.5 km）。毛伊岛激光雷达的温度通常比MSIS-00的预测值高，而SOR激光雷达的数据与MSIS-00的数据相当，除了在MIL高度范围内。SOR和毛伊岛中层顶温度在盛夏最冷，在中层顶过渡期最热。然而，毛伊岛的中层顶比SOR温暖，并且毛伊岛的中层顶温度变化的幅度（109 K）比SOR（1019 K）小得多。SOR季节性资料清楚地显示了两个不同的中层顶高度水平，夏季（5月至8月）的低高度约为86.5 km，其余时间的高高度约为101 km。两个稳定水平之间的突然转变发生在5月初和9月初。激光雷达的测量结果表明，在毛伊岛7月份，当以当地午夜为中心的10小时内平均时，中层顶高度接近87.5公里。
The nighttime thermal structure of the mesosphere and lower thermosphere (MLT) region at the Starfire Optical Range (SOR), New Mexico (35.0°N, 106.5°W), and at Maui, Hawaii (20.7°N, 156.3°W), are characterized using Na lidar observations. Both locations exhibit mesospheric temperature inversion layers (MILs) between 85 and 100 km that are not predicted by the MSIS-00 model. The amplitudes of the Maui MILs (∼5.8 K) are about half of those at SOR (∼9.8 K), and the Maui MILs have a smaller width (∼11.1 km) compared to the SOR MILs (∼14.5 km). The Maui lidar temperatures are generally warmer than the MSIS-00 predictions, while the SOR lidar data are comparable to the MSIS-00, except in the MIL altitude range. Both SOR and Maui mesopause temperatures are coldest in midsummer and are warmest during the mesopause transition periods. However, the Maui mesopause is warmer than the SOR, and the amplitude of the mesopause temperature variations at Maui (∼9 K) is much smaller than at SOR (∼19 K). Two distinct levels of mesopause altitudes are clearly shown in the SOR seasonal data with a low altitude around 86.5 km in summer (May through August) and a high altitude around 101 km during the rest of the year. Abrupt transitions between the two stable levels occur in early May and early September. The lidar measurements indicate a low mesopause altitude near 87.5 km in July at Maui when averaging over a 10-hour period centered at local midnight.