Experimental Evidence of Arctic Summer Mesospheric Upwelling and its Connection to Cold Summer Mesopause
Experimental Evidence of Arctic Summer Mesospheric Upwelling and its Connection to Cold Summer Mesopause
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北极夏季中层上升流及其与冷夏季中层顶联系的实验证据
DOI：
10.1002/2017gl074759
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发表时间：
2017
影响因子：
5.2
通讯作者：
and P. Hoffmann
中科院分区：
文献类型：
--
作者：
Laskar;F. I. ;J. L. Chau;J. P. St-Maurice;G. Stober;C. M. Hall;M. Tsutsumi;J. Hoeffner;and P. Hoffmann
利用相距约130公里的两个雷达站的共同体积中层流星探测资料，反演了69°N附近82~96公里高度的水平风场，并由风场的梯度估算了水平风散散。这是第一次对中间层进行这类测定。12年几乎连续的数据集揭示了水平风散度场的系统夏季特征，即恰好在中层顶以下的最小特征。有迹象表明，中层顶最小值附近的水平散度与中层顶温度有关。此外，与中层散度最小相对应的海拔高度也有逐年增加的趋势。我们从中层的水平风散散度中得到垂直风速，这表明向上的风在中层顶附近达到峰值。这些风表明，在夏季中高层最低温度区域绝热冷却最强。利用相距约130公里的两个雷达站的共同体积中层流星探测，反演了高纬度、69°N附近82到96公里高度的水平风场，根据风场的梯度估计了水平风散。这是第一次对中间层进行这类测定。12年几乎连续的数据集揭示了水平风散度场的系统夏季特征，即恰好在中层顶以下的最小特征。有迹象表明，中层顶最小值附近的水平散度与中层顶温度有关。此外，与中层散度最小相对应的海拔高度也有逐年增加的趋势。我们发现，中层水平风散度的反转与中层顶附近的上升风峰值是一致的。这些风表明，在夏季中高层最低温度区域绝热冷却最强。利用相距约130公里的两个雷达站的共同体积中层流星探测，反演了高纬度、69°N附近82到96公里高度的水平风场，根据风场的梯度估计了水平风散。这是第一次对中间层进行这类测定。12年几乎连续的数据集揭示了水平风散度场的系统夏季特征，即恰好在中层顶以下的最小特征。有迹象表明，中层顶最小值附近的水平散度与中层顶温度有关。此外，与中层散度最小相对应的海拔高度也有逐年增加的趋势。我们发现，中层水平风散度的反转与中层顶附近的上升风峰值是一致的。这些风表明，绝热冷却在夏季中顶层顶温度最低的区域最强。
Common volume mesospheric meteor detections from two radar stations separated by about 130 km were used to retrieve horizontal wind fields between 82 and 96 km altitudes at high latitudes, near 69°N. The horizontal wind divergence was estimated from the gradients of the wind fields. This determination is the first of its kind for the mesosphere. Twelve years of nearly continuous data sets reveal systematic summer signatures in the horizontal wind divergence field, namely, a minimum just below the mesopause. There are indications that the horizontal divergence near the mesopause minimum is correlated with the mesopause temperature. Also, the altitude corresponding to the mesospheric divergence minimum tends to increase over the years. We derived the vertical velocity from the horizontal wind divergence at the mesosphere, which shows upward winds peaking near the mesopause. These winds indicate that adiabatic cooling was strongest at the region of the deep temperature minimum seen in the summer mesopause.Common volume mesospheric meteor detections from two radar stations separated by about 130 km were used to retrieve horizontal wind fields between 82 and 96 km altitudes at high latitudes, near 69°N. The horizontal wind divergence was estimated from the gradients of the wind fields. This determination is the first of its kind for the mesosphere. Twelve years of nearly continuous data sets reveal systematic summer signatures in the horizontal wind divergence field, namely, a minimum just below the mesopause. There are indications that the horizontal divergence near the mesopause minimum is correlated with the mesopause temperature. Also, the altitude corresponding to the mesospheric divergence minimum tends to increase over the years. We show that the reversal in the horizontal wind divergence at the mesosphere is consistent with upward winds peaking near the mesopause. These winds indicate that adiabatic cooling was strongest at the region of the deep temperature minimum seen in the summer mesopause.Common volume mesospheric meteor detections from two radar stations separated by about 130 km were used to retrieve horizontal wind fields between 82 and 96 km altitudes at high latitudes, near 69°N. The horizontal wind divergence was estimated from the gradients of the wind fields. This determination is the first of its kind for the mesosphere. Twelve years of nearly continuous data sets reveal systematic summer signatures in the horizontal wind divergence field, namely, a minimum just below the mesopause. There are indications that the horizontal divergence near the mesopause minimum is correlated with the mesopause temperature. Also, the altitude corresponding to the mesospheric divergence minimum tends to increase over the years. We show that the reversal in the horizontal wind divergence at the mesosphere is consistent with upward winds peaking near the mesopause. These winds indicate that adiabatic cooling was strongest at the region of the deep temperature minimum seen in the summer mesopause.