Subseasonal Variation in Neptune’s Mid-infrared Emission
Subseasonal Variation in Neptune’s Mid-infrared Emission
复制标题
海王星中红外发射的次季节变化
作者：
M. Roman;L. Fletcher;G. Orton;T. Greathouse;J. Moses;N. Rowe;P. Irwin;A. Antuñano;J. Sinclair;Y. Kasaba;T. Fujiyoshi;I. de Pater;H. Hammel
我们提出了一个分析所有目前可用的地基成像海王星在中红外。这些照片拍摄于2003年至2020年之间，揭示了海王星2005年南夏至前后中红外线（108 -25 μm）发射随时间的变化。对平流层乙烷（12 μm）、甲烷（18 μm）和CH 3D（19 μm）敏感的图像显示了区域和全球尺度上显著的亚季节时间变化。与H2 S（1）氢四极（17.035 μm）光谱的比较表明，这些变化主要与平流层温度变化有关。平流层似乎在2003年至2009年期间在多个过滤波长上冷却，随后在2018年至2020年期间南极急剧变暖。相反，对流层上层的温度--从17至25微米的图像推断--在这段时间里似乎没有变化，除了南极，南极在2003年至2006年之间似乎最热。我们讨论了观测到的变化的背景下，季节性强迫，对流层气象学和太阳周期。总的来说，这些数据提供了迄今为止最有力的证据，表明在海王星的平流层中，这些过程在全球和区域尺度上都产生了亚季节变化。
We present an analysis of all currently available ground-based imaging of Neptune in the mid-infrared. Dating between 2003 and 2020, the images reveal changes in Neptune’s mid-infrared (∼8–25 μm) emission over time in the years surrounding Neptune’s 2005 southern summer solstice. Images sensitive to stratospheric ethane (∼12 μm), methane (∼8 μm), and CH3D (∼9 μm) display significant subseasonal temporal variation on regional and global scales. Comparison with H2 S(1) hydrogen quadrupole (∼17.035 μm) spectra suggests that these changes are primarily related to stratospheric temperature changes. The stratosphere appears to have cooled between 2003 and 2009 across multiple filtered wavelengths, followed by a dramatic warming of the south pole between 2018 and 2020. Conversely, upper-tropospheric temperatures—inferred from ∼17 to 25 μm imaging—appear invariant during this period, except for the south pole, which appeared warmest between 2003 and 2006. We discuss the observed variability in the context of seasonal forcing, tropospheric meteorology, and the solar cycle. Collectively, these data provide the strongest evidence to date that processes produce subseasonal variation on both global and regional scales in Neptune’s stratosphere.
海王星上的新黑暗漩涡
DOI：
10.3847/1538-3881/aaa6d6
发表时间：
2018
期刊：
The Astronomical Journal
影响因子：
--
作者：
Wong, Michael H.;Tollefson, Joshua;Hsu, Andrew I.;Pater, Imke de;Simon, Amy A.;Hueso, Ricardo;Sánchez-Lavega, Agustín;Sromovsky, Lawrence;Fry, Patrick;Luszcz-Cook, Statia
通讯作者：
Luszcz-Cook, Statia