An Examination of the Predictability of Tropical Cyclone Genesis in High-Resolution Coupled Models with Dynamically Downscaled Coupled Data Assimilation Initialization

Predicting tropical cyclone(TC) genesis is of great societal importance but scientifically challenging. It requires fineresolution coupled models that properly represent air-sea interactions in the atmospheric responses to local warm sea surface temperatures and feedbacks, with aid from coherent coupled initialization. This study uses three sets of highresolution regional coupled models(RCMs) covering the Asia-Pacific(AP) region initialized with local observations and dynamically downscaled coup...     

Fingerprinting subducted oceanic crust and Hainan Plume in the melt sources of Cenozoic Basalts from the South China Sea Region

Geochemical data compilation of Cenozoic basalts recovered from the South China Sea tectonic domain shows westward weakening of the influence of a focal zone‐like component in Nd–Hf, Nd–Pb and Sr–Pb, but not in Pb–Pb isotope spaces because the Pb isotopes are dominantly controlled by the high U/Pb component derived from the subducted Pacific oceanic slab. Low Th/U melt generated by recycling of marine carbonates, rather than the subduction‐related enriched mantle (EM2), signals the emplacement of the Hainan Plume at ~25 Ma. Radiogenic Hf in the pre‐existing ancient sub‐continental lithospheric mantle beneath the Cathaysia Block was greatly depleted by early‐stage magmatism influenced by the high U/Pb component. Hence, late Cenozoic basalts associated with the carbonatitic melts display contrasting Nd–Hf isotope covariations, with the Red River–Zhongnan Fault System as a dividing line, implying that the East and Southwest sub‐basins have been developed on the Cathaysia and Indochina Blocks respectively.     

Petrogenesis of lunar meteorite Northwest Africa 2977: Constraints from in situ microprobe results

Abstract– Northwest Africa (NWA) 2977 is an olivine‐gabbro lunar meteorite that has a distinctly different petrographic texture from other lunar basalts. We studied this rock with a series of in situ analytical methods. NWA 2977 consists mainly of olivine and pyroxene with minor plagioclase. It shows evidence of intense shock metamorphism, locally as high as shock‐stage S6. Olivine adjacent to a melt vein has been partially transformed into ringwoodite and Al,Ti‐rich chromite grains have partially transformed into their high‐pressure polymorph (possibly CaTi₂O₄‐structure). Olivine in NWA 2977 contains two types of lithic inclusions. One type is present as Si,Al‐rich melt inclusions that are composed of glass and, in most cases, dendritic pyroxene. The other type is mafic and composed of relatively coarse‐grained augite with accessory chromite, RE‐merrillite, and baddeleyite. Two Si,Al‐rich melt inclusions are heavy rare earth elements (REE) enriched, whereas the mafic inclusion has high REE concentrations and a KREEP‐like pattern. The mafic inclusion could be a relict fragment captured during the ascent of the parent magma of NWA 2977, whereas the Si,Al‐rich inclusions may represent the original NWA 2977 melt. The calculated whole‐rock composition has a KREEP‐like REE pattern, suggesting that NWA 2977 has an affinity to KREEP rocks. Baddeleyite has recorded a young crystallization age of 3123 ± 7 Ma (2σ), which is consistent with results from previous whole‐rock and mineral Sm‐Nd and Rb‐Sr studies. The petrography, mineralogy, trace element geochemistry, and young crystallization age of NWA 2977 support the possibility of pairing between NWA 2977 and the olivine‐gabbro portion of NWA 773.     

云南省威信县地质灾害与防治对策

威信县地质构造较复杂,地质灾害破坏严重。主要地质灾害类型有滑坡、崩塌、泥石流、不稳定斜坡及地裂缝五种。其中以滑坡和不稳定斜坡为主,灾害点分布较广且个体规模小,稳定性较差。调查显示,威信县地质灾害的形成与发生时多种致灾因素相互作用的结果。通过对威信县地质灾害成因分析得出:地质构造、岩土体类型、地形地貌、生态植被等因素是滑坡、泥石流、崩塌及不稳定斜坡形成的基本条件;降雨及人类活动等因素是形成滑坡、泥石流、崩塌、地裂缝及不稳定斜坡的主导因素。对地质灾害的防治应采用以群测群防为基本手段,与搬迁避让、工程防治、生物防治、清除危岩(土)体及排水为主的防治措施相结合的综合治理方法。     

进入21世纪新疆非油气矿产资源物探勘查技术的应用

新疆矿产资源优势明显、找矿潜力巨大。进入21世纪以来,新疆在地质勘查资金投入大幅度增加的条件下,地质勘查工作获得了又一次难得的发展机遇。地质勘查工作遵照"区划、区调、物化探、勘查科研五统一"的科学地质勘查体系,非油气资源物探勘查技术在铁、铜镍、铅锌和煤等矿产勘查、攻深找盲及寻找地下水源地等方面取得了重要进展,对新疆重要成矿带地质找矿突破和矿业开发发挥了重要作用。     

基于云原生的时空大数据平台设计与实现

作为测绘地理信息工作实现"两支撑、一提升"定位的服务载体、自然资源管理的统一底板、智慧城市的时空基础设施、数字孪生城市的空间数字底盘等,时空大数据平台已成为城市信息化建设不可或缺的内容.时空大数据平台服务领域不断扩大,对其在时空大数据汇聚、融合、管理、共享、分析,以及高可用、高并发、高弹性等方面的要求也不断提升.本文基...     

陕西关中地区层状云降水及雷达特征分析

作为人工增雨的一项基础工作,利用陕西关中地区宝鸡等3个雷达站附近共12个气候站1998-2007年2~11月的降水及雷达实测资料,分析了该地区的层状云降水及雷达回波特征。结果表明,(1)关中地区人工增雨的适宜时段为每年的2月5日~11月15日;(2)对层状云降雨的天气形势和雷达回波进行了分类;(3)统计分析了宝鸡雷达站稳定性层状云降雨和混合性层状云降雨雷达回波的最大回波强度、回波顶高度、冷层厚度、暖层厚度、融化层厚度、融化层高度等特征;(4)春、秋季稳定性层状云及混合性层状云冷层厚度大于暖层厚度一倍以上,云层中水汽条件较好,更适合人工增雨作业。     

信息系统机房防雷技术浅析

本文重点介绍了中国人民银行西藏昌都地区分行信息系统机房在布线、SPD设计、电磁屏蔽、等电位连接、接地等防雷技术实践中的应用,以保障信息系统安全稳定的运行.     

西北太平洋柔鱼中心渔场环境分析系统的设计与开发

针对海洋渔业领域中,运用SST(海洋表层温度)数据进行中心渔场预测分析的实际情况以及地理信息系统的设计,完成了西北太平洋柔鱼中心渔场环境分析系统的需求分析、总体设计,并采用ArcGIS软件为二次开发平台研发了原型系统。系统采用三层结构模型,运用关系型数据库存储空间数据,实现了空间数据和属性数据一体化的无缝管理;并且采用成熟的COM技术和先进的WebService技术用于系统的集成与发布,确保了系统的可靠性、规范性和可扩展性,为海洋渔业部门提供决策支持。     

基于改进失水模式和增加建模站点的Palmer旱度模式

根据1965年Palmer旱度模式的思路,在1986年修正版及2003年修正版的基础上,为了使Palmer旱度模式更适用于我国北方干旱、半干旱地区,通过改进2003年修正的Palmer旱度模式在建模时表层失水模式的假设以及增加建模站点个数两个方面对Palmer旱度模式进行进一步修正。将计算的Palmer指数值与2003年计算的Palmer指数值及一些文献记载的实际旱涝灾情相对照进行验证,结果表明:新修正的Palmer旱度模式能更好地评估旱涝情况,扩大其在我国干旱地区的适用性。