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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Observations of high-latitude lower thermospheric winds from Thule Air Base and Sondre Stromfjord, Greenland
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Observations of high-latitude lower thermospheric winds from Thule Air Base and Sondre Stromfjord, Greenland

机译：来自格陵兰Thule空军基地和Sondre Stromfjord的高纬低层热层风的观测

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Lower thermospheric winds have been determined from Fabry-Perot interferometer (FPI) measurements of the Doppler shift of the 5577-A O(~1S) emission over Thule Air Base (76.5 deg N, 69.0 deg W) and Sondre Stromfjord (67.0 deg N, 50.9 deg W), Greenland. These winds normally correspond to the altitude of the peak of the airglow O(~1 S) emission layer, near 97 km. The altitude ambiguity due to auroral contamination has been reduced by eliminating data when the intensity of the emission increases significantly. Contamination by airglow emission of 5577-A O(~1 S) originating from higher altitudes has been investigated by an FPI simulation code. The simulation results indicate that this latter emission may contribute an anomalous diurnal oscillation to ground-based 5577-A O(~1 S) FPI measurements of lower thermospheric wind. The agreement of diurnal phases between that deduced from the green-line measurements and that determined from simultaneous red-line observation supports this conclusion. The same simulation applied to observations from Sondre Stromfjord shows that the upper layer contamination is much weaker and is not serious. Significant day-to-day variation is evident in the lower thermospheric wind field. Average neutral winds are calculated, and a harmonic analysis is carried out to examine the major low-frequency wind components. The seasonal variations of these wind components are compared with radar data and model predictions. The observations are generally in good agreement with model results. The comparison between FPI and radar results also shows reasonable agreement. The semidiurnal amplitudes observed with the Sondre Stromfjord radar during the Lower Thermospheric Coupling Study (LTCS-1) and LTCS-2 periods are always greater than the climatological values obtained from averaging FPI and Chatanika radar observations. This result shows the variability that can be expected when comparing "instantaneous" estimates of tidal parameters with climatological results.
机译：根据法布里-珀罗干涉仪（FPI）对Thule空军基地（76.5度N，69.0度W）和Sondre Stromfjord（67.0度N， 50.9度W），格陵兰。这些风通常对应于接近97 km的气辉O（〜1 S）发射层的峰值高度。通过在发射强度显着增加时消除数据，降低了因极光污染引起的高度模糊性。通过FPI模拟代码研究了源自更高海拔的5577-A O（〜1 S）的气辉发射造成的污染。仿真结果表明，后者的这种排放可能对低热层风的地面5577-A O（〜1 S）FPI测量产生异常的昼夜振荡。绿线测量值与红线同时观测值确定的昼夜相一致证明了这一结论。用于Sondre Stromfjord观测的相同模拟结果表明，上层污染要弱得多，而且并不严重。在较低的热层风场中，每天的变化明显。计算平均中性风，并进行谐波分析以检查主要的低频风分量。将这些风分量的季节变化与雷达数据和模型预测进行比较。观察结果通常与模型结果非常吻合。 FPI与雷达结果的比较也显示出合理的一致性。在下热圈耦合研究（LTCS-1）和LTCS-2期间，使用Sondre Stromfjord雷达观测到的半日振幅始终大于平均FPI和Chatanika雷达观测所获得的气候值。此结果显示了将潮汐参数的“瞬时”估计值与气候结果进行比较时可以预期的可变性。

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