Temporal Variations in Vertical Cloud Structure of Jupiter's Great Red Spot, Its Surroundings and Oval BA From HST/WFC3 Imaging

Temporal Variations in Vertical Cloud Structure of Jupiter's Great Red Spot, Its Surroundings and Oval BA From HST/WFC3 Imaging
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HST/WFC3 成像中木星大红斑及其周围环境和椭圆 BA 垂直云结构的时间变化

DOI:
10.1029/2022je007427
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发表时间:
2023
期刊:
Planets
影响因子:
--
通讯作者:
Anguiano-Arteaga A
Anguiano-Arteaga A
中科院分区:
--
文献类型:
--
作者:
Anguiano-Arteaga A

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在这项研究中,我们介绍了2015年至2021年木星大红斑(GRS),其周围环境和椭圆BA中霾的性质和垂直分布的演变。要检索的主要大气参数,我们建模的光谱反射率的一些动态和/或光谱感兴趣的地区与辐射传输工具,使用最佳的估计方案。选定区域的光谱是从高分辨率的哈勃空间望远镜宽视场相机3图像中获得的,覆盖了200至900 nm的光谱范围。用于描述不同木星区域的先验模型大气取自安吉亚诺-阿特阿加等人。(2021,https://doi.org/10.1029/2021JE006996)。我们发现,GRS的最大变化发生在2019年开始的平流层和对流层霾层的光学厚度和2018年对流层霾粒子的平均尺寸。这两种霾的吸收光谱在分析的地区和年份之间变化不大,平流层霾的性质似乎与Carlson等人提出的发色团相容。(2016,https://doi.org/10.1016/j.jumus.2016.03.008)。我们报告的颜色变化的椭圆形BA从红色到白色,在这些年来,根据我们的模型,可以主要解释在平流层霾光学厚度的减少。
In this study, we present the evolution of the properties and vertical distribution of the hazes in Jupiter's Great Red Spot (GRS), its surroundings and Oval BA from 2015 to 2021. To retrieve the main atmospheric parameters, we model the spectral reflectivity of a number of dynamically and/or spectrally interesting regions with a radiative transfer tool that uses an optimal estimator scheme. The spectra of the selected regions are obtained from high‐resolution Hubble Space Telescope Wide Field Camera 3 images that cover the spectral range from 200 to 900 nm. The a priori model atmosphere used to describe the various Jovian regions is taken from Anguiano‐Arteaga et al. (2021, https://doi.org/10.1029/2021JE006996) for each corresponding area. We find that the biggest variations in the GRS occur in the optical thickness of the stratospheric and tropospheric haze layers starting in 2019 and in the mean size of the tropospheric haze particles in 2018. The absorption spectra of both hazes show little variations among the analyzed regions and years, with the stratospheric haze properties seeming compatible with the chromophore proposed by Carlson et al. (2016, https://doi.org/10.1016/j.icarus.2016.03.008). We report a color change of Oval BA from red to white during these years that, according to our models, can be mostly explained in terms of a decrease in the stratospheric haze optical depth.
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