Seasonal Variation in Gravity Wave Momentum and Heat Fluxes in the Mesopause Region Observed by Sodium Lidar
Seasonal Variation in Gravity Wave Momentum and Heat Fluxes in the Mesopause Region Observed by Sodium Lidar
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钠激光雷达观测到的中层顶区域重力波动量和热通量的季节变化
DOI：
10.1029/2022jd037558
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发表时间：
2022-11
期刊：
影响因子：
--
通讯作者：
Caiwen Xu
中科院分区：
文献类型：
--
作者：
Tao Li;Chao Ban;Xin Fang;Feng Li;Yetao Cen;Dexin Lai;Cong Sun;Leilei Sun;Jialing Zhang;Caiwen Xu
利用合肥窄带钠激光雷达近10年（2012 - 2021年）的温度和风观测资料，计算了中层顶重力波纬向动量和热量垂直通量的季节变化。除夏季外，西风纬向动量通量主要向西分布，其中近80%由短周期（10 min-1 hr）的西风贡献，且与偏东的纬向风有关。春季和冬季的平均西向纬向动量通量分别为-2.55和-1.78 m2/s2，远强于秋季的-0.98 m2/s2。夏季的动量通量主要是向东的，主要是长周期（1 - 16小时）的GWs。这些纬向动量通量的季节变化主要是由于低层平均背景风对全球Ws的过滤。年平均纬向动量通量偏西，数值为− 1.08 m2/s2。由通量散度计算的加速度在93公里以下偏西，与偏东的平均纬向风相反。94公里以下的热通量全年呈下降趋势，没有明显的季节变化。年平均热通量主要是向下的，在87至95公里之间的冷却速率为每天10 - 35 K。
The seasonal variations in gravity wave (GW) vertical fluxes of zonal momentum and heat in the mesopause region are calculated using nearly 10 years (from 2012 to 2021) of temperature and wind observations by a narrowband sodium lidar located in Hefei, China (32°N, 117°E). Except in summer, the GW zonal momentum fluxes are mostly westward, with ∼80% contributed by the short‐period (10 min–1 hr) GWs, and anticorrelate with the eastward zonal wind. The mean westward zonal momentum fluxes in spring and winter are −2.55 and −1.78 m2/s2, respectively, which are much stronger than −0.98 m2/s2 in fall. The momentum flux in summer is primarily eastward, dominated by long‐period (1–16 hr) GWs. These seasonal variations in zonal momentum fluxes are mainly due to the filtering of GWs by the mean background wind at lower altitudes. The annual mean zonal momentum flux is westward with a value of −1.08 m2/s2. The calculated acceleration from flux divergence is westward below 93 km, opposite to the eastward mean zonal wind. The heat flux below 94 km is downward throughout the year, with no apparent seasonal variation. The annual mean heat flux is primarily downward, with a cooling rate of ∼−35 K/day between 87 and 95 km.
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