Moore Casey A, Moores John E, Newman Claire E, Lemmon Mark T, Guzewich Scott D, Battalio Michael
York University, Centre for Research in Earth and Space Sciences (CRESS), 4700 Keele Street, Toronto ON M3J 1P3, Canada.
Aeolis Research, Pasadena, CA 91107, United States.
Icarus. 2019 Sep 1;329:197-206. doi: 10.1016/j.icarus.2019.03.041. Epub 2019 Apr 1.
This paper updates the record of atmospheric dust loading within northern Gale Crater, Mars, by providing line-of-sight extinction (LOS-Ext) measurements of the intervening dust between the rover and the crater rim. These measurements are derived from images taken with the Navigation Cameras (Navcam) onboard the Mars Science Laboratory (MSL) rover, Curiosity. The observations span 2.44 Mars years, from Mars Year (MY) 31 at a solar longitude ( ) of 208° to t = 7° of MY34, sols 100 - 1701 of the MSL surface mission. This work examines the dataset for seasonal trends of the LOS-Ext in addition to horizontal variations and the vertical structure of LOS-Ext. The LOS-Ext has a repetitive pattern with a single peak in the latter half of the Mars year. The atmosphere in the crater is well mixed horizontally but not vertically as larger LOS-Ext is seen nearer the crater floor than at higher altitudes within the crater. The results allow a discussion on whether or not Gale Crater is a sink for atmospheric dust or a source of atmospheric dust in the current era.
本文通过提供火星车与环形山边缘之间中间尘埃的视线消光（LOS-Ext）测量值，更新了火星盖尔陨石坑北部大气尘埃负荷的记录。这些测量值源自火星科学实验室（MSL）漫游车“好奇号”上的导航相机（Navcam）拍摄的图像。观测跨越2.44个火星年，从火星年（MY）31的太阳经度（ ）208°到火星年34的 = 7°，即MSL表面任务的第100 - 1701个火星日。这项工作除了研究LOS-Ext的水平变化和垂直结构外，还检查了LOS-Ext季节性趋势的数据集。LOS-Ext具有重复模式，在火星年下半年出现单峰。陨石坑内的大气在水平方向上混合良好，但在垂直方向上并非如此，因为在陨石坑底部附近比在陨石坑内较高海拔处观察到更大的LOS-Ext。这些结果有助于讨论在当前时代，盖尔陨石坑是大气尘埃的汇还是源。
