基于LRO Diviner数据的月球虹湾地区表面亮温时空分布
投稿时间:2017-02-09  修订日期:2017-05-03  点此下载全文
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作者单位E-mail
马明 吉林大学 121303083@qq.com 
陈圣波 吉林大学 chensb@jlu.edu.cn 
基金项目:国家自然科学基金项目(41372337,3A415AK44423),科技基础专项项目(2015FY210500)和863计划(2015AA123704)
中文摘要:Diviner在7年多的运行时间内,共获得了超过3.3×1011个辐射亮度测量值。这些数据除了具有的推扫性、条带性和少量的“坏点线”与“故障”等特征外,在一个月球日内呈现白天正午前后和整个夜晚亮温值变化幅度相对均匀,上下午尤其是日出和日落前后亮温值变化剧烈的规律。本文利用昼夜分段亮温拟合模型,结合数值模拟、奇异值剔除、分段拟合和纬向校正等方法获得了虹湾地区6个时刻的高分辨率和高覆盖度的亮温分布。结果表明,白天的亮温与太阳辐射通量值计算的温度值相接近,敏感于地形起伏、物质混合和通道光度计特性等因素,最高和最低亮温分别出现在朝向赤道方向的山坡和落差最大的撞击坑中心位置;夜晚的亮温敏感于视场内物质的热物理属性差异,变化幅度由上半夜的相对剧烈逐渐过渡到下半夜的趋于均匀。文章揭示了月表热能量交换规律,解释了复杂和异常月表热红外环境的本质,提供了一个关于无大气星体的风化层如何存储热红外辐射能量以及与空间环境进行能量交换的新视角。
中文关键词:虹湾  Diviner  亮温  时空分布
 
The Sinus Iridum Surface Brightness Temperature Temporal-Spatial Distributions by LRO Diviner Data
Abstract:Approximately more than 330 billion calibrated radiance measurements of the Moon had been acquired by Diviner over 7 years. Diviner data were routinely interrupted by pushbroom nadir mapping mode and had a small number of outliers during spacecraft or instrument anomalies. In one lunar day, the change of brightness temperature is relatively uniform at noon or throughout the night and abnormally severe in the morning or afternoon especially during sunrise and sunset. The Sinus Iridum bright temperature distributions of high spatial resolution and high coverage in 6 moments have been obtained by processing methods which include numerical simulation of bright temperature, elimination of singularities, piecewise fit and latitudinal direction correction. Remarkably, diurnal brightness temperatures are nearly equal to that calculated from the solar flux and vary depending on the distribution of topography range, material composition and channel photometric properties. The highest value appears in the direction of the slope towards the equator and the lowest value appears at the center of the crater where the elevation difference is the biggest. Nevertheless, nocturnal brightness temperatures mainly are sensitive to materials with differing thermophysical properties and brightness temperature drop rate changes from severly in the first half of the night and gradually becomes uniform in the latter half of the night. Results of the paper reveal the surface energy balance of the Moon, explain the complex and extreme nature of the lunar surface thermal environment and provide a new comprehensive view of how regoliths on airless heavenly bodies store and exchange thermal energy with the space environment.
keywords:Sinus Iridum  Diviner  BrightnessSTemperature  Temporal-SpatialSDistributions
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