载人月球探测科学目标及着陆区选址建议

聚焦月球探测和应用的前沿科学问题,基于载人航天和月球探测的技术能力以及月球与行星科学研究水平,围绕月球科学研究、月基科学研究和资源勘查利用3个方面,提出了载人月球探测任务的科学目标,包含9个顶层目标和38个具体目标。依据科学目标和国内外载人月球探测着陆区选择现状与发展趋势,提出了我国载人月球探测着陆区选择基本原则和流程。结合科学价值和载人登月任务的工程实施条件,提出了30个精选着陆区,并给出了后续确定着落区地址需考虑的因素。科学目标和着陆区选址建议是载人月球探测工程的重要牵引和顶层输入,将为工程的方案设计和后续实施提供支撑。

川西林盘乡土景观基因识别研究——以都江堰龙泉村为例

在统筹城乡协同发展的背景下,众多城市都陷入“千城一面”的窘境——城镇正在逐渐丧失特有的文化特色和风貌景观。与此同时,不少乡村也呈现出同质化发展的现象,即使在具有鲜明特色、丰富传统性特征的地方,也很难保存原有的地域性特征。川西林盘作为一种特殊的乡村聚居形式,是传统川西农耕文明的结晶,是宝贵的历史沉淀产物,其地域景观独具特色。然而城镇化进程使部分林盘的物质类和非物质类乡土景观缺乏自身特色,逐渐丧失其特有文化。本文基于景观基因的研究视角,以四川省都江堰市聚源镇龙泉村林盘为研究对象,挖掘和解析其乡土景观基因,识别其景观特征,并提出景观基因识别的8大识别因子和23项识别指标,构建了川西林盘乡土景观基因识别指标体系,为我国川西林盘乡土景观的保护与发展提供新的思路。

Chang'E-1 Lunar Mission:An Overview and Primary Science Results

Chang'E-1 is the first lunar mission in China,which was successfully launched on Oct.24th,2007.It was guided to crash on the Moon on March 1,2009,at 52.36°E,1.50°S,in the north of Mare Fecunditatis.The total mission lasted 495 days,exceeding the designed life-span about four months.1.37Terabytes raw data was received from Chang'E-1.It was then processed into 4Terabytes science data at different levels.A series of science results have been achieved by analyzing and applicating these data,especially "global image of the Moon of China's first lunar exploration mission".Four scientific goals of Chang'E-1 have been achieved.It provides abundant materials for the research of lunar sciences and cosmochemistry.Meanwhile these results will serve for China's future lunar missions.

Data Analysis of Chang'E-1 Gamma-Ray Spectrometer and Global Distribution of U,K,and Th Elemental Abundances

Gamma-ray spectrometer （GRS） is one of the main payloads on the Chang＇E-1 （CE-1） lunar probe, mainly aimed to detect the elemental abundances and distributions on the lunar surface. At 03：58 on 28 November 2007, it performed the first observation of the lunar gamma rays. As of 24 October 2008, 2105 h of effective gamma rays spectra had been acquired by CE-1 GRS, which covers the whole surface of the moon. This paper mainly describes the data processing procedures and methods of deriving the elemental abundances by using the CE-1 GRS time series corrected spectra： first, to bin data into pixels for mapping; then, to perform a background deduction of the cumulative spectra and obtain a peak area of the elements; and finally, to use the elemental abundances inversion model to produce the elemental abundances. Based on these processing methods, the global abundance maps of U, K, and Th at a 5°×5° equal-area pixel are acquired by CE-1 GRS data. The paper gives a preliminary analysis of the uncertainties of the elemental abundances.

Preliminary results of FeO mapping using Imaging Interferometer data from Chang'E-1

Information about the variability,and spatial distribution of iron abundance is important to understand lunar geological history and for future resource utilization. In this paper we present a preliminary model to produce an iron abundance map using images taken by an Imaging Interferometer on board the satellite Chang'E-1. Compared with the Clementine UVVIS images,the images from the Chang'E-1 satellite also allowed for the extraction of FeO abundance distributions on the Moon. However,the prelimi-nary model results suggest an underestimation of ～2 wt.% for the FeO content of the mare region and an overestimation of ～3 wt.% for the highland region.

Preliminary results of TiO_2 mapping using Imaging Interferometer data from Chang'E-1

The distribution of titanium abundance on the lunar surface is important knowledge for lunar geologic studies and future resource utilization.In this paper,we develop a preliminary model based on"ground truths"from Apollo and Luna sample-return sites to produce a titanium abundance map from Chang’E-1 Imaging Interferometer(IIM) images.The derived TiO2 abundances are validated with Clementine UVVIS results in several regions,including lunar highlands neighboring the Apollo 16 landing site,and high-Ti and low-Ti maria near the standard site of Mare Serenitatis(MS2) .The validation results show that TiO2 abundances modeled with Chang’E-1 IIM data are overestimated for highlands(～0.7 wt.%) and low-Ti maria(～1.5 wt.%) and underestimated for high-Ti maria(～0.8 wt.%).

Cratering process and morphological features of the Xiuyan impact crater in Northeast China

By using crater impact morphological theory and mathematics modeling,the paper studies the cratering process and morphological features of the Xiuyan Crater in Northeast China based on remote sensing imagery,digital elevation model(DEM)and drilling and measuring data.The results show that:1)Simulated calculation indicates the diameter of the transient crater was1406±12 m and the depth was 497±4 m.The diameter of the final crater was 1758±15 m and the depth was 374.5±3.5 m;the thickness of the breccia lens was 188.5±0.5 m.The data is basically the same as previous drilling data.2)Preliminary determination of the size of Xiuyan impactor:The diameter at about 55 m for an iron meteorite,and about 115 m for a stony meteorite.3)The depth-to-diameter ratio is 0.143,similar to the typical simple crater.The circularity index of the Xiuyan Crater is0.884,indicating erosion and degradation.4)The distribution pattern of radial fractures has priority in NW-SE and WNW-ESE and these fractures control the development and evolution of drainage inside the crater.