论文标题
从2012年到2019
Vertically-resolved observations of Jupiter's quasi-quadrennial oscillation from 2012 to 2019
论文作者
论文摘要
在过去的八年中，使用IRTF的Texes仪器中的中红外CH4观测值的丰富数据集已被用来表征木星平流层的热演化。这些数据用于在50°S和50°N的纬度之间产生垂直分辨的温度图，从而使我们能够跟踪大约两个木星的准季节振荡（QQO）。在观察的前五年中，QQO具有平滑的正弦模式，周期为4.0 $ \ pm $ 0.2岁，振幅为7 $ \ pm $ 1 K $ 1 K $ 1 K，13.5 MBAR（我们的最大敏感性区域）。在2017年，我们注意到这种模式的突然变化，阶段向后移动〜1年。为了寻找QQO延迟的可能原因，我们调查了TexES Zonally-Resolved温度检索，发现在2017年5月/6月，有一个异常温暖的热异常，位于28°N的纬度为28°N，向西的压力为1.2 MBAR，速度为19 $ \ pm $ 4 m/s/s的速度为19美元。我们建议这两个事件之间可能存在联系。
Over the last eight years, a rich dataset of mid-infrared CH4 observations from the TEXES instrument at IRTF has been used to characterize the thermal evolution of Jupiter's stratosphere. These data were used to produce vertically-resolved temperature maps between latitudes of 50°S and 50°N, allowing us to track approximately two periods of Jupiter's quasi-quadrennial oscillation (QQO). During the first five years of observations, the QQO has a smooth sinusoidal pattern with a period of 4.0$\pm$0.2 years and an amplitude of 7$\pm$1 K at 13.5 mbar (our region of maximum sensitivity). In 2017, we note an abrupt change to this pattern, with the phase being shifted backwards by ~1 year. Searching for possible causes of this QQO delay, we investigated the TEXES zonally-resolved temperature retrievals and found that in May/June 2017, there was an unusually warm thermal anomaly located at a latitude of 28°N and a pressure of 1.2 mbar, moving westward with a velocity of 19$\pm$4 m/s. We suggest that there may be a link between these two events.
