晚更新世末期东亚季风活动与陆架区沉积环境变迁

从距今 18 0 0 0年的最后冰期最盛时期到距今 10 0 0 0年开始的全新世海侵 ,全球气侯发生过急剧的变化。位于亚洲东部的古季风活动也经历了盛衰变化。大量的钻孔及浅地层剖面分析资料已经证实 ,冰期最盛时期陆架区古季风活动加强 ,陆架出现了沙漠环境与黄土沉积。当冰期结束 ,气候转暖 ,冬季风减弱之际 ,南黄海陆架及长江三角洲一带的沙漠与黄土分布范围也随之缩小 ,原先的沙漠活动区变成了黄土分布区 ,也就是所谓硬粘土沉积区。随着古季风活动的进一步衰退和海面的不断升高 ,来自陆架区的东北风变为冷湿气流。长江三角洲地区和陆架上出现了有利于沼泽发育的环境 ,全新世海侵把泥炭层淹没。陆架区晚更新世末期以来的地层中出现沙层、硬粘土和泥炭层的沉积序列 ,即“三元沉积结构”,是古冬季风盛衰过程的最好记录     

青藏高原珠峰绒布河谷地区近地层湍流输送特征

利用2006年6月和2007年6月中国科学院HEST大气科学实验在珠峰绒布河谷地区获取的近地层湍流观测资料,分析了近地层湍流谱特征和方差统计特征,讨论了上下2层(2m和8m)基本气象要素和湍流通量的日变化特征.结果表明,珠峰地区湍流能谱基本上符合Monin-Obukov相似性理论在惯性副区的变化规律;由于山谷复杂地形和下垫面的影响,湍流方差统计值均小于高原其它地方;珠峰地区近地层感热通量白天下层大于上层,夜间相反;潜热通量一天内基本上上层大于下层.     

秦岭勉略带中鞍子山蛇绿杂岩的地球化学：——古洋壳碎片的证据及意义

鞍子山蛇绿杂岩位于秦岭勉略带东段,它由蛇纹石化变质橄榄岩和ＭＯＲＢ型变质镁铁质岩组成。蛇纹石化变质橄榄岩主要是方辉橄榄岩和少量二辉橄榄岩,表了古洋幔的上部岩石;变质镁铁质岩为斜长角闪岩,其原岩是基性火成岩类,它多以亏损ＬＲＥＥ元素和具有很高的＾１４３Ｎｄ／＾１４４Ｎｄ值为特征,类似于现代洋壳中的洋中脊玄武岩（ＭＯＲＢ）,代表了古洋壳的残余部分。这表明鞍子山晕绿杂岩是勉略混杂岩带中又一个典型的蛇绿岩     

南极威尔克斯地SGR钻孔处雪冰转化过程中的密度变化特征

本文着重描述了SGR钻孔处冰盖上的积雪在密实化过程中的特征变化,并对该过程进行了分段的和全面的回归分析.结果表明,冰盖密度随深度增大,但增长幅度随深度减小.作者提出密度变化减小度的概念.计算得出的所研究冰芯钻取点的密度变化减小度为-0.15kg/m~3·m~2,粒雪成冰前的密实速率平均值为4.08kg/m~3·a.本文得到的冰盖密度变化“临界点”与以往报道的有所不同.分析这一现象时,作者强调当积雪还在活动层时冰盖温度的影响,并以此解释密度剖面的异常变化以及离差的回升.特别指出,积雪的密度变化具有气候学意义,它在一定程度上能够反映出积雪形成及变化过程中气候变化的某些信息.本文由密度变化确定的钻孔点雪冰转化深度为50米.     

褐藻多酚合成的模拟研究

褐藻多酚是间苯三酚的聚合物,结构复杂,有关生物合成途径方面的研究报道甚少。近年发现,褐藻多酚具有多种生物活性和医药价值(Ragan & Glombitza,1986),因此，研究褐藻多酚的人工合成不仅可模似研究褐藻多酚的生物合成过程,而且为寻找替代自然资源打下了基础。 作者在实验中观察到配制的间苯三酚溶液放置一段时间后会逐渐发黄,因此认为间苯三酚在放置过程中发生了氧化聚合,并对此作了进一步研究。     

粤北地区乳源-潮州MT剖面深部电性结构及地学意义

为了揭示粤北地区岩石圈深部结构、深大断裂性质及花岗岩分布规律等科学问题,布设了乳源-潮州宽频带大地电磁探测剖面。由二维反演得出的电性结构,讨论了粤北地区岩石圈导电性结构特点。沿剖面存在3个花岗岩分布区,呈现不同的类型,可能代表不同的成因模式。沿剖面划分3条北东向断裂带:吉安-四会断裂、赣江断裂于韶关东形成宽度近20km的低阻区域,其间形成断陷盆地;河源-邵武断裂带,其两侧发育壳幔高导层并发育壳幔混合型花岗岩,深部电性结构复杂,可能为壳幔剧烈作用的场所;丽水-海丰断裂带,控制了燕山晚期花岗岩的分布。韶关、连平之间和龙川、丰顺之间50～150km存在2个巨大的低阻体,可能是地幔物质底侵作用的"通道";且底侵方向指向连平和龙川之间的区域,由于底侵作用力贡献,发育了一系列的壳内和上地幔高导层。粤北地区岩石圈从西向东逐渐减薄,从100余km减薄到60km,反映了太平洋板块对欧亚板块的消减作用。潮州100km深度以下的中-低阻特征,推断为太平洋板块俯冲作用留下的"洋壳"物质。     

上饶市广信区国土空间规划"一张图"实施监督信息系统探索

国土空间规划"一张图"实施监督信息系统是在国土空间基础信息平台和国土空间规划"一张图"基础上,为国土空间规划编制、审查、实施、监督提供技术支撑的信息化系统.该系统引入一种用于三维可视化的倾斜摄影数据采集方法,构建三维立体"一张图",真实地浏览和展示数据,开发"一键式"综合分析功能,将复杂空间分析步骤高度集成和定制化,建立监测预警大数据平台.该系统可辅助审查及决策,有效提升管理部门办事效率,全面提升国土空间规划动态监测、综合监管及社会公众服务能力,助力自然资源管理及空间治理迈向智慧化.     

Study on distribution characteristics of strong earthquakes in Sichuan-Yunnan area and their geological tectonic background

Introduction Both Sichuan and Yunnan are provinces with more earthquakes. Based on catalogue of strong earthquakes in China compiled by the Prediction Department of China Earthquake Administration, there are 639 M5.0 earthquakes during 26 B.C.~A.D. 2001. Among them, 475 are M=5.0~5.9 events, 124 are M=6.0~6.9 events, 39 are M=7.0~7.9 events, and one is M=8 event occurred in Sichuan and Yunnan area. Here is one of the areas where seismic activities are most active in China. Sichuan-Yun…     

Changes in the hydrography of Central California waters associated with the 1997–98 El Niño

Oceanographic conditions off Central California were monitored by means of a series of 13 hydrographic cruises between February 1997 and January 1999, which measured water properties along an oceanographic section perpendicular to the California Coast. The 1997–98 El Niño event was defined by higher than normal sea levels at Monterey, which began in June 1997, peaked in November 1997, and returned to normal in March 1998. The warming took place in two distinct periods. During June and July 1997, the sea level increased as a result of stronger than normal coastal warming below 200 dbars and within 100 km of the coast, which was associated with poleward flow of saltier waters. During this period, deeper (400–1000 dbar) waters between 150–200 km from shore were also warmed and became more saline. Subsequently, sea level continued to rise through January 1998, mostly as a result of the warming above 200 dbars although, after a brief period of cooling in September 1997, waters below 200 dbar were also warmer than normal during this period. This winter warm anomaly was also coastally trapped, extending 200 km from shore and was accompanied by cooler and fresher water in the offshore California current. In March and April 1998, sea level dropped quickly to normal levels and inshore waters were fresher and warmer than the previous spring and flowed southward.The warming was consistent with equatorial forcing of Central California waters via propagation of Kelvin or coastally-trapped waves. The observed change in heat content associated with the 1997–98 El Niño was the same as that observed during the previous seasonal cycle. The warming and freshening events were similar to events observed during the 1957–58 and 1982–83 El Niños.     

重力活塞取样器取样技术研究

现代海洋沉积物柱状取样技术是一套综合性的高新技术系统,它一般应该包括：优良的取样器具,方便灵活的取样操作设备,高精度的定位导航仪器和高分辨率的地形、地貌、地层探测系统等四个方面。我国和先进国家相比,取样操作设备方面差距最大,应该成为我国今后取样技术研究和发展的重点