NURE航空计划回顾与新时代航空γ能谱勘查启示     

李敬敏  米耀辉  骆遥 《物探与化探》2021,(2):394-402

国家铀资源评价(NURE)计划实现了覆盖美国本土和阿拉斯加的1∶250000 NTMS图幅航空γ能谱测量和航磁测量,通过简要回顾该计划历程,重点针对NURE中航空地球物理勘查(航空γ能谱和航磁测量),讨论了航空地球物理勘查中测量技术、数据处理及解释方法等。NURE航空测量在铀矿勘查和辐射环境评价、洲际航空地球物理编图等领域发挥了巨大作用,产生了意义深远的影响。在总结NURE航空测量经验和做法的基础上,针对我国航空γ能谱测量勘查现状,建议从国家层面进行顶层设计,尽快实施我国陆域范围内的航空γ能谱和航磁框架性测量,实现对我国陆域航空γ能谱测量全覆盖,建设具有中国特色的航空γ能谱测量与监测体系。  相似文献   

BCC模式及其开展的CMIP6试验介绍   总被引：2，自引：0，他引：2  

辛晓歌  吴统文  张洁  张芳  李伟平  张艳武  路屹雄  房永杰  颉卫华  张莉  董敏  史学丽  李江龙  储敏  刘茜霞  颜京辉 《气候变化研究进展》2019,15(5):533-539

世界气候研究计划（WCRP）正在组织实施第六次国际耦合模式比较计划（CMIP6),国家气候中心作为参与单位之一,通过近几年的模式研发,推出3个最新模式版本参与该计划,包括含有气溶胶化学模块的地球系统模式BCC-ESM1.0、中等分辨率气候模式BCC-CSM2-MR和高分辨率气候模式BCC-CSM2-HR。除了CMIP6中的气候诊断、评估和描述试验（DECK）和历史气候模拟试验（Historical),这3个模式共将参与CMIP6中的10个模式比较子计划。文中主要介绍这3个模式的基本情况以及所开展的CMIP试验,并对BCC-CSM2-MR模式的Historical试验结果进行简要评估,为试验数据使用者提供参考。  相似文献   

Linking pesticides and human health: A geographic information system (GIS) and Landsat remote sensing method to estimate agricultural pesticide exposure     

《Applied geography (Sevenoaks, England)》2015

Accurate pesticide exposure estimation is integral to epidemiologic studies elucidating the role of pesticides in human health. Humans can be exposed to pesticides via residential proximity to agricultural pesticide applications (drift). We present an improved geographic information system (GIS) and remote sensing method, the Landsat method, to estimate agricultural pesticide exposure through matching pesticide applications to crops classified from temporally concurrent Landsat satellite remote sensing images in California. The image classification method utilizes Normalized Difference Vegetation Index (NDVI) values in a combined maximum likelihood classification and per-field (using segments) approach. Pesticide exposure is estimated according to pesticide-treated crop fields intersecting 500 m buffers around geocoded locations (e.g., residences) in a GIS. Study results demonstrate that the Landsat method can improve GIS-based pesticide exposure estimation by matching more pesticide applications to crops (especially temporary crops) classified using temporally concurrent Landsat images compared to the standard method that relies on infrequently updated land use survey (LUS) crop data. The Landsat method can be used in epidemiologic studies to reconstruct past individual-level exposure to specific pesticides according to where individuals are located.  相似文献   

Unraveling Hong Kong Geopark experience with visitor-employed photography method     

《Applied geography (Sevenoaks, England)》2015

Geoparks have been established around the world with the major objective of protecting significant geoheritage features and reinforcing geoconservation ideas and support through educating visitors. Understanding visitors' perception of geoheritage can inform educational and conservation endeavors. This study used the visitor-employed photography (VEP) method to unravel visitor perception of geoheritage and associated natural and cultural features in the recently designated Hong Kong Global Geopark of China (HKGP). Participants were asked to take photographs of scenes with an effect on their experience in the HKGP and to elaborate in a logbook the chosen subject, reason of choice, and effect on their travel experience. Aimed at capturing real-time and organic experiences, it was found that geoheritage plays a major role in HKGP visits. Visitors develop strong emotional connections with nature through appreciating and learning about prominent features of both small and landscape scales. However, a mismatch was found between visitor belief or incorrect geological or geomorphological knowledge with inherently strong enthusiasm in deciphering the science behind geoheritage. The findings permit development of a new approach of geopark interpretation, commencing with aesthetic and emotional connections with geoheritage features. Modification of fixed on-site provisions and guiding services directed at visitor interests can better spread geoheritage knowledge and reinforce geoconservation ideas. Modeling after overseas practices, a park ranger system, audio guide devices and smart phone applications are essential to achieve meritorious geopark management, appreciation, and enjoyment.  相似文献   

Polygonal deformation bands     

《Journal of Structural Geology》2015

We report for the first time the occurrence of polygonal faults in sandstone, which is compelling given that layer-bound polygonal fault systems have been observed so far only in fine-grained sediments such as clay and chalk. The polygonal faults are shear deformation bands that developed under shallow burial conditions via strain hardening in dm-wide zones. The edges of the polygons are 1–5 m long. The shear deformation bands are organized as conjugate faults along each edge of the polygon and form characteristic horst-like structures. The individual deformation bands have slip magnitudes ranging from a few mm to 1.5 cm; the cumulative average slip magnitude in a zone is up to 10 cm. The deformation bands heaves, in aggregate form, accommodate a small isotropic horizontal extension (strain <0.005). The individual shear deformation bands show abutting T-junctions, veering, curving, and merging where they mechanically interact. Crosscutting relationships are rare. The interactions of the deformation bands are similar to those of mode I opening fractures. The documented fault networks have important implications for evaluating the geometry of km-scale polygonal fault systems in the subsurface, top seal integrity, as well as constraining paleo-tectonic stress regimes.  相似文献   

郑州黄河国家地质公园生态环境地质状况及防治措施分析     

刘超良  赵晓斌  张汇涛  彭智博  李文香 《四川地质学报》2011,(4):442-445

在收集分析大量最新资料基础上,重点介绍了郑州黄河国家地质公园的地貌特征、区域地质背景、水文地质条件,调查了公园内的生态环境地质状况,对已出现的重要生态环境地质问题提出了相应的措施及防治对策,实现对生态环境地质的妥善保护、合理开发与科学重建.  相似文献   

青州国家地质公园地质遗迹资源类型及评价     

张莉莉  王元波  王心兵  姜能翔  袁野  王志强 《山东地质》2011,(9):25-28

重要地质遗迹是人类的宝贵财富,是生态环境的重要组成部分。青州国家地质公园5.3亿年前处于海陆边缘地带,地质遗迹类型丰富,保存完好,对研究我国东部乃至东南亚地区环境的演变具有重要的科学价值。该文详细介绍了青州国家地质公园的地质遗迹类型,并对其进行了评价。  相似文献   

http://www.sciencedirect.com/science/article/pii/S1674987111000156   总被引：1，自引：0，他引：1  

Xiaohuan Xi  Zhongfang Yang  Yujun Cui  Shumei Sun  Chengguang Yu  Min Li 《地学前缘(英文版)》2011,2(2):115-123

Employing the Unit Soil Carbon Amount (USCA) approach, soil carbon storage was calculated across the Northeast Plain of China based on the Multi-purpose Regional Geochemical Survey conducted in 2004 – 2006 (MRGS). The results indicated that the soil organic carbon (SOC) storage in topsoil (0 – 0.2 m), subsoil (0 – 1 m) and deep soil (0 – 1.8 m) was 768.1 Mt, 2978.4 Mt and 3729.2 Mt with densities of 3327.8 t/km2, 12,904.7 t/km2 and 16,157.5 t/km2, respectively. These values were consistent with national averages, whereas the soil carbon densities showed a clear increasing trend from the southern area of the Northeast Plain (Liaoning), to the middle (Jilin) and the northern Plain (Heilongjiang) — particularly in terms of topsoil carbon density, which increased from 2284.2, to 3436.7 and 3861.5 t/km2, respectively. In comparison to carbon data obtained from the Second National Soil Survey in 1984 – 1986 (SNSS), the topsoil SOC storage values from the MRGS were found to have decreased by 320.59 Mt (29.4%), with an average annual decline of 16.0 Mt (l.73%) over the 20 years. In the southern, middle and northern areas of the plain, soil carbon densities decreased by 1060.6 t/km2, 1646.4 t/km2 and 1300.2 t/km2, respectively, with an average value of 1389.0 t/km2 for the whole plain. These findings indicate that the decrease in soil carbon density varied according to the different ecosystems and land use types. Therefore, ratios of soil carbon density were calculated in order to study the carbon dynamic balance between ecosystems, and to further explore distribution characteristics, as well as the sequestration potential of SOC.  相似文献   

Influence of Tourists′ Environmental Tropisms on Their Attitudes to Tourism and Nature Conservation in Natural Tourist Destinations: A Case Study of Jiuzhaigou National Park in China     

CHENG Shaowen    ZHANG Jie  LU Shaojing  XU Feifei  ZHANG Honglei 《中国地理科学(英文版)》2011,(3)

People′s environmental tropism has an effect on their understanding of tourism-nature relationship,and also influences their attitudes to natural resources utilization and environmental protection.Taking Jiuzhaigou National Park of China as a study case,the authors conducted some quantitative analyses with the tools of SPSS 16.0 and LISREL 8.7,to explore the influence of tourists′ environmental tropism on their attitudes to tourism and nature conservation in the natural tourist destination.Three hypotheses ...  相似文献   

巴基斯坦红其拉甫国家公园种子植物区系分析   总被引：1，自引：0，他引：1  

海鹰  阿布力米提·阿布都卡迪尔  曾雅娟  陈济丁  王云  陶双成  周剑 《干旱区地理》2011,34(3):486-491

红其拉甫国家公园(国家自然保护区)位于巴基斯坦北部地区,喀喇昆仑山南坡,介于36°04′～37°05′N和74°38′～75°45′E之间,海拔3 200～6 000 m之间,平均海拔4 000 m,总面积约2 270 km2,建于1975年.通过实地考察和查阅相关文献资料,对分布于该地区的植物从区系组成、区系性质的角...  相似文献