Venus’s Southern Polar Vortex Reveals Precessing Circulation
Venus’s Southern Polar Vortex Reveals Precessing Circulation
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金星的南极涡旋揭示了进动环流
DOI：
10.1126/science.1201629
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发表时间：
2011
期刊：
影响因子：
56.9
通讯作者：
F. Nuccilli
中科院分区：
文献类型：
--
作者：
D. Luz;D. Berry;G. Piccioni;P. Drossart;R. Politi;C. Wilson;S. Erard;F. Nuccilli
金星快车轨道器的观测揭示了复杂的极地大气动力学。金星快车使命拍摄的金星南极的初始图像显示了一个明亮的，高度可变的漩涡的存在，类似于行星的北极。使用金星快车可见光和红外热成像光谱仪（VIRTIS）仪器对极地风的高分辨率红外测量，我们显示涡旋具有不断变化的内部结构，旋转中心从地理南极偏移约3个纬度，并以5至10个地球日的周期围绕极地漂移。这表明极地大气环流相对于行星轴的不对称和变化的岁差。
Observations with the Venus Express Orbiter reveal complex polar atmospheric dynamics. Initial images of Venus’s south pole by the Venus Express mission have shown the presence of a bright, highly variable vortex, similar to that at the planet’s north pole. Using high-resolution infrared measurements of polar winds from the Venus Express Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) instrument, we show the vortex to have a constantly varying internal structure, with a center of rotation displaced from the geographic south pole by ~3 degrees of latitude and that drifts around the pole with a period of 5 to 10 Earth days. This is indicative of a nonsymmetric and varying precession of the polar atmospheric circulation with respect to the planetary axis.