Impact of Data Assimilation on Thermal Tides in the Case of Venus Express Wind Observation
Impact of Data Assimilation on Thermal Tides in the Case of Venus Express Wind Observation
复制标题
金星快车风观测资料同化对热潮的影响
DOI：
10.1029/2019gl082700
复制
发表时间：
2019
影响因子：
5.2
通讯作者：
Takagi Masahiro
中科院分区：
文献类型：
--
作者：
Sugimoto Norihiko;Kouyama Toru;Takagi Masahiro
利用地球模拟器局部集合变换卡尔曼滤波资料同化系统的金星大气环流模式，研究了水平风同化对热潮的影响。同化的数据是从金星快车轨道器上的金星监测相机拍摄的金星紫外线图像中提取的水平风。结果表明，尽管只有大约一个地球日在南侧的云顶观测一次，但在水平风和温度场中，热潮的三维结构都得到了显著改善。再现的温度场与金星气候轨道器赤月号最近的无线电掩星测量结果吻合得很好。全球纬向风和纬向温度的纬向平均场也得到了改善。这项研究可以重新分析过去对金星的观测。
Impacts of horizontal winds assimilation on thermal tides are investigated by using the Venus atmospheric general circulation model for the Earth Simulator local ensemble transform Kalman filter data assimilation system. The assimilated data are horizontal winds derived from Venus ultraviolet images taken by the Venus Monitoring Camera onboard the Venus Express orbiter. The results show that three‐dimensional structures of the thermal tides are significantly improved not only in the horizontal winds but also in the temperature field, even though the observations are available only at the cloud top level on the southern dayside hemisphere approximately once an Earth day. The reproduced temperature fields agree well with recent radio occultation measurements of the Venus Climate Orbiter Akatsuki. The zonal mean fields of the zonal wind and temperature are also improved globally. This study would enable reanalysis of past Venus observations.