• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of geophysical research. Planets >Orientation and distribution of recent gullies in the southern hemisphere of Mars: Observations from High Resolution Stereo Camera/Mars Express (HRSC/MEX) and Mars Orbiter Camera/Mars Global Surveyor (MOC/MGS) data
【24h】

Orientation and distribution of recent gullies in the southern hemisphere of Mars: Observations from High Resolution Stereo Camera/Mars Express (HRSC/MEX) and Mars Orbiter Camera/Mars Global Surveyor (MOC/MGS) data

机译：火星南半球最近沟壑的方向和分布：来自高分辨率立体相机/火星快车（HRSC / MEX）和火星轨道相机/火星全球测量师（MOC / MGS）的观测数据

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Geologically recent small gullies on Mars display morphologies consistent with erosion by water or by debris flows. Suggested formation models are divided into two main categories: (1) groundwater or (2) melting of near-surface ice/snow sourced from the atmosphere. We have measured location and orientation and recorded the local contexts of gullies to constrain the likely models of gully formation. More than 22,000 Mars Orbiter Camera Narrow Angle (MOC NA) and >120 Mars Express High Resolution Stereo Camera (HRSC) images in the southern hemisphere were searched for gullies. Discrete gullied slope sections with consistent orientation were recorded rather than individual gullies. Slope setting (impact crater, valley wall, etc.), location, and orientation were recorded for each slope section. More than 750 MOC images with gullies (>900 distinct gullied slope sections) and more than 40 HRSC images (>380 distinct gullied slope sections) were identified. From both MOC and HRSC, gullies were found to be most common between ?30 and ?50 degrees latitude and to have an overall pole facing preference. The preferred gully orientation for HRSC is southeast rather than south in MOC, owing to illumination effects that make gullies difficult to detect on south- to southwest-facing slopes in HRSC. In both MOC and HRSC surveys, higher-latitude gullies show less preference for pole facing than those at mid latitudes. Both data sets produced similar results, demonstrating that our data are reliable. We suggest that the observed latitudinal and orientation distributions of gullies show that insolation and atmospheric conditions play a key role in gully formation.
机译：火星上最近的地质小沟显示出与水或泥石流侵蚀相一致的形态。建议的地层模型分为两个主要类别：（1）地下水或（2）来自大气的近地表冰/雪融化。我们已经测量了位置和方向，并记录了沟壑的局部环境，以约束沟壑形成的可能模型。在南半球搜索了22,000多个火星轨道摄像机的窄角（MOC NA）和> 120幅火星快速高分辨率立体摄像机（HRSC）的图像。记录了具有一致方向的离散沟壑坡面，而不是单个沟壑。记录每个坡度部分的坡度设置（撞击坑，山谷壁等），位置和方向。识别出超过750个具有沟壑的MOC图像（> 900个不同的沟渠坡面）和40多个HRSC图像（> 380个不同的沟壑坡面）。从MOC和HRSC中，发现沟壑在纬度30至50度之间最为常见，并且总体上具有极向性。 HRSC的首选沟壑方向是MOC的东南方向，而不是南部，这是由于光照效应使HRSC的西南向西南坡度很难检测到沟壑。在MOC和HRSC的调查中，高纬度的沟壑比中纬度的沟壑对极面的偏爱要小。两种数据集都产生了相似的结果，表明我们的数据是可靠的。我们建议观察到的沟壑的纬度和方向分布表明日晒和大气条件在沟壑形成中起关键作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号