Cold Collar Reproduced by a Venus GCM With the Akatsuki Horizontal Wind Assimilation

Cold Collar Reproduced by a Venus GCM With the Akatsuki Horizontal Wind Assimilation
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维纳斯 GCM 借助晓水平风同化再现冷领

DOI:
10.1029/2022je007689
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发表时间:
2023
期刊:
Journal of Geophysical Research: Planets
影响因子:
--
通讯作者:
Matsuda Yoshihisa
Matsuda Yoshihisa
中科院分区:
--
文献类型:
--
作者:
Ando Hiroki;Fujisawa Yukiko;Sugimoto Norihiko;Takagi Masahiro;Matsuda Yoshihisa

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金星极地地区高层大气的热结构是通过同化来自赤月紫外线图像的低纬度和中纬度的水平风来再现的。所获得的结构与红外和无线电掩星测量结果很好地吻合。特别是,我们模型中金星极涡的冷领和暖极区等独特的热特征是真实的:冷领所在的水平以及冷领和暖极区的温差与数据是一致的。金星极区高层大气的热结构之所以符合实际,是因为云顶附近纬向风的分布和热潮诱导的剩余平均经向环流的结构相对于没有资料同化的模式有所改善。我们的研究结果还表明,金星上极区的热结构与大气动力学密切相关。
The thermal structure of the upper atmosphere in the Venus polar region is reproduced by the assimilation of horizontal winds in low‐ and mid‐latitudes derived from the Akatsuki ultra‐violet images. The obtained structure is well consistent with infrared and radio occultation measurements. In particular, the unique thermal features in the Venus polar vortex such as the cold collar and the warm polar region in our model are realistic: the level where the cold collar is located and the temperature difference between the cold collar and the warm polar region are consistent with data. The reasons why the thermal structure of the upper atmosphere in the Venus polar region is realistic are that the zonal wind distribution around the cloud top level and the structure of the residual mean meridional circulation induced by the thermal tides are improved with respect to the model without data assimilation. Our results also suggest that the thermal structure in the Venus upper polar region is closely related to the atmospheric dynamics.
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