• 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 >A survey of Martian dust devil activity using Mars Global Surveyor Mars Orbiter Camera images
【24h】

A survey of Martian dust devil activity using Mars Global Surveyor Mars Orbiter Camera images

机译：火星全球测量师火星轨道器摄像机图像对火星尘埃魔鬼活动的调查

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

A survey of dust devils using the Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) wide- and narrow-angle (WA and NA) images has been undertaken. The survey comprises two parts: (1) sampling of nine broad regions from September 1997 to July 2001 and (2) a focused seasonal monitoring of variability in the Amazonis region, an active dust devil site, from March 2001 to April 2004. For part 1, dust devils were identified in NA and WA images, and dust devil tracks were identified in NA images. Great spatial variability in dust devil occurrence is highlighted, with Amazonis Planitia being the most active region examined. Other active regions included Cimmerium, Sinai, and Solis. Numerous dust devil tracks, but very few dust devils, were observed in Casius. This may suggest dust devils here occur at local times other than that of the MGS orbit (～2 pm). Alternatively, variations in surface properties may affect the ability of dust devils to leave visible tracks. The seasonal campaign within Amazonis shows a relatively smooth variation of dust devil activity with season, peaking in mid northern summer and falling to zero in southern spring and summer. This pattern of activity correlates well with the boundary layer maximum depth and hence the vigor of convection. Global maps of boundary layer depth and surface temperature do not predict that Amazonis should be especially active, potentially suggesting a role for mesoscale circulations. Measurement of observed dust devils yields heights of up to 8 km and widths in excess of 0.5 km.
机译：使用火星全球测量师（MGS）的火星轨道相机（MOC）的广角和窄角（WA和NA）图像对尘埃进行了调查。该调查包括两个部分：（1）从1997年9月至2001年7月对9个大区域进行采样;（2）从2001年3月至2004年4月，对活跃的尘埃魔鬼站点Amazonis地区进行有针对性的季节性监测。如图1所示，在NA和WA图像中识别出尘土飞沫，并且在NA图像中识别出了尘埃魔鬼轨道。突出显示了尘埃魔鬼发生的巨大空间变异性，其中Amazonis Planitia是最活跃的区域。其他活跃区域包括Cimmerium，Sinai和Solis。在卡修斯（Casius），发现了许多尘埃魔鬼的踪迹，但尘埃魔鬼很少。这可能表明这里的尘土飞尘发生在MGS轨道（〜2 pm）以外的其他地方。可选地，表面性质的变化会影响灰尘魔鬼留下可见轨迹的能力。亚马逊地区的季节性活动表明，沙尘暴活动随季节变化相对平稳，在北部夏季中期达到顶峰，在南部春季和夏季降至零。这种活动模式与边界层的最大深度以及对流的活力密切相关。边界层深度和表面温度的全球图谱并未预测亚马逊河应该特别活跃，这可能暗示了中尺度环流的作用。测量观测到的尘埃会产生高达8 km的高度和超过0.5 km的宽度。

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