Characteristics of the Quiet‐Time Hot Spot Gravity Waves Observed by GOCE Over the Southern Andes on 5 July 2010
Characteristics of the Quiet‐Time Hot Spot Gravity Waves Observed by GOCE Over the Southern Andes on 5 July 2010
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2010年7月5日GOCE观测到的安第斯山脉南部安静时间热点重力波特征
DOI：
10.1029/2019ja026693
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Baumgarten, Gerd
中科院分区：
文献类型：
--
作者：
Vadas, Sharon L.;Xu, Shuang;Yue, Jia;Bossert, Katrina;Becker, Erich;Baumgarten, Gerd
我们分析了2010年7月5日23 UT重力场和海洋环流探测卫星飞越南安第斯山脉时的静止时间数据。我们利用傅里叶分析从密度扰动和横轨风中提取了20个最大的行进大气扰动。利用包含现实分子黏度的重力波耗散理论，对参数空间进行搜索，以确定哪些热点传播的大气扰动是重力波。结果表明，17 gw的水平波长λ h = 170 ~ 1850 km，本征周期τ ir = 11 ~ 54 min，本征水平相速scih = 245 ~ 630 m/s，密度摄动0.03 ~ 7%。我们明确地确定了其中11个gw的传播方向，并发现大多数gw的传播方向具有较大的经向分量。通过反向光线追踪，我们发现其中的10个gww一定是在中间层或热层中产生的。研究表明，当天早些时候在平流层观测到山波（MWs），这些山波在距离对流不稳定约70-75公里处饱和。我们认为，这10个重力场和海洋环流探索者热点GWs很可能是由次级GWs的耗散产生的第三级（或更高阶）GWs，这些次级GWs是由由MW断裂产生的局部体力所激发的。我们认为另一个GW可能是二级或三级（或更高阶）GW。这项研究强烈表明，常规的全球环流模式不能成功地模拟在对流层或平流层发射的静止时间中冬热层中南安第斯山脉的热点GWs。
We analyze quiet‐time data from the Gravity Field and Ocean Circulation Explorer satellite as it overpassed the Southern Andes atz≃275 km on 5 July 2010 at 23 UT. We extract the 20 largest traveling atmospheric disturbances from the density perturbations and cross‐track winds using Fourier analysis. Using gravity wave (GW) dissipative theory that includes realistic molecular viscosity, we search parameter space to determine which hot spot traveling atmospheric disturbances are GWs. This results in the identification of 17 GWs having horizontal wavelengthsλH= 170–1,850 km, intrinsic periodsτIr= 11–54 min, intrinsic horizontal phase speedscIH= 245–630 m/s, and density perturbations 0.03–7%. We unambiguously determine the propagation direction for 11 of these GWs and find that most had large meridional components to their propagation directions. Using reverse ray tracing, we find that 10 of these GWs must have been created in the mesosphere or thermosphere. We show that mountain waves (MWs) were observed in the stratosphere earlier that day and that these MWs saturated atz∼ 70–75 km from convective instability. We suggest that these 10 Gravity Field and Ocean Circulation Explorer hot spot GWs are likely tertiary (or higher‐order) GWs created from the dissipation of secondary GWs excited by the local body forces created from MW breaking. We suggest that the other GW is likely a secondary or tertiary (or higher‐order) GW. This study strongly suggests that the hot spot GWs over the Southern Andes in the quiet‐time middle winter thermosphere cannot be successfully modeled by conventional global circulation models where GWs are parameterized and launched in the troposphere or stratosphere.
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