Diurnal evolution of the barrier layer and its local feedback in the central Taiwan Strait

Diurnal evolution of the barrier layer (BL) and its local feedback features in the central Taiwan Strait (119.2oE,24.3oN) during summertime monsoon are investigated using in situ moored observations conducted by the Yan-Ping 2 research vessel in late June 2005.During the initiation phase,for the non-solar radiation tends to be trapped in the upper mixed layer,whereas the solar radiation can penetrate deeply through the mixed layer approaching the thermocline,most heat is accumulated inside the BL inducing a...     

FZY-1型多分量式钻孔应变仪的设计

介绍了最新研制的FZY-1型多分量式钻孔应变仪的探头的设计,所采用的电路,仪器参数的检测方法及该仪器的安装方法。     

双轴压力下岩样自电位变化实验的新结果

利用伺服控制双轴加载系统,采用阵列式布局的应变、自电位测量方法,对岩石样品弹性变形阶段和破坏过程中的应变和自电位进行了实验研究. 结果表明,在突然加卸载、黏滑和岩样破裂几种特定情况下,自电位和应变场均出现了互相关联的脉冲状突然变化,且具有相当大的空间展布. 尽管有时应力σ值相当高,但当应力变化率γ= dσ/ dt为零（恒载）且保持正、负常数（匀速加、卸载）时,自电位始终没有异常出现. 反之,无论γ的增量Δγ为正值或负值,当γ突变,即对样品进行突然加卸载的时刻则出现了脉冲状自电位信号ΔV,Δγ的正或负对ΔV的影响是相反的. 分析表明,应力突变时ΔV与Δγ的异常幅度成正比. 应力突变和岩石破裂过程中自电位明显的时空变化意味着,孕震区附近如果自电位有突变,就有可能观测到相关的自电位前兆和同震变化, 并可能出现同步的应变变化,这给地震的自电位和应变前兆方法提供了实验证据.     

孟加拉湾季风爆发可预测性的分析和初步应用

基于季风区对流层中高层副高脊附近的经向温度梯度能表征季节转换和季风爆发的物理本质这一事实,使用1980—1999年过渡季节期间(3～5月)逐日和月平均的NCEP／NCAR高空温度场再分析资料,对该温度梯度潜在的预报季风爆发进行了分析。结果表明：在已知初始时刻孟加拉湾季风区对流层中高层经向温度梯度的前提下,依据初始时刻的经向温度梯度和气候平均的经向增温率梯度,可以对孟加拉湾季风爆发的迟早做出定性预测。另外,由于孟加拉湾地区季风爆发日期与3月份青藏高原上空对流层中高层气温有显著相关,故前期高原上空对流层中高层的气温高低也是判断孟加拉湾季风爆发迟早的重要因子。对2000年和2001年孟加拉湾季风爆发迟早定性预测的结果表明,这两种预报方法具有潜在的应用价值。     

A Study of SST Warming Trend in the Western Equatorial Pacific in a Coupled Ocean-Atmosphere-Land GCM

１．ＢａｃｋｇｒｏｕｎｄＡｇｌｏｂａｌｏｃｅａｎ－ａｔｍｏｓｐｈｅｒｅ－ｌａｎｄｓｙｓｔｅｍｇｅｎｅｒａｌｃｉｒｃｕｌａｔｉｏｎｍｏｄｅｌ（ＧＣＭ）ｈａｓｂｅｅｎｄｅｖｅｌｏｐｅｄｉｎｔｈｅＳｔａｔｅＬａｂｏｒａｔｏｒｙｏｆＮｕｍｅｒｉｃａｌＭｏｄ...     

四川盆地卤水钾资源分布类型及其品质的研究

四川盆地三叠纪海相沉积层屡有地下卤水,品质优异,除普遍含K+,构成液态钾资源外,并伴生Br-、I-、B3+,Li+等多种有用组分,经济价值极高。卤水钾有沉积变质型和与钾盐溶滤叠加型两类。对局部构造深层卤水储量,在当前条件下,可采用容积法计算。对其开发利用可为我国钾盐提供新的矿物原料。目前需要对卤水钾资源的资产意识问题、开发利用及环境问题、地质勘查及相应的研究问题、开发的统一部署问题,认真加以解决。     

山东黄河流域下游土壤粒度和深度试验成果

以黄河流域下游野外获得的土壤粒度和深度纵剖面试验资料为基础，分析了黄河流域下游不同土壤类型区、不同地貌单元的土壤粒级组成、元素在各粒级组中的分配特征和元素在土壤纵剖面中的含量、纵向变化规律，探讨了其在生态地球化学调查中的意义。确定了能代表区域内土壤主要物质组成的粒级范围，提出了本区生态地球化学调查的最佳样品筛分加工方案和表层、深层土壤样品采集的有效深度和层位。     

秦岭发现金刚石:横贯中国中部巨型超高压变质带新证据及古生代和中生代两期深俯冲作用的识别

在秦岭北带榴辉岩及其围岩片麻岩的锆石中发现金刚石和大量石墨包裹体。金刚石具典型的1331～1334cm~(-1)拉曼谱峰。变质金刚石的发现证明秦岭北带榴辉岩及其围岩片麻岩经历了超高压变质作用,其俯冲深度>120 km。片麻岩锆石的SHRIMP定年表明,锆石核部代表岩浆事件的年龄或之前的残核年龄为1200～1800 Ma,超高压变质新增生边部的年龄为507±38 Ma,属早古生代。认为北秦岭超高压变质带与印支期大别超高压变质带(240～200 Ma)是时空上两个带。北秦岭超高压变质带向西可以与南阿尔金—柴北缘早古生代(490～440Ma)超高压变质带相连,向东与大别西北部的熊店和浒湾早古生代榴辉岩(420～400 Ma)相连,组成一条沿中央造山带北部分布的加里东期超高压变质带。认为主要分布在大别山南部的印支期超高压变质带应与南秦岭的高压蓝片岩带相连,组成一条分布在中央造山带南部的印支期高压超高压变质带。北秦岭超高压变质带的发现,为中央造山带存在一条西起阿尔金,东至苏鲁的近4000 km的世界上最大的一条超高压变质带的确定提供了新的关键性证据。而沿中央造山带分布的两条超高压变质带说明:①中国南北大陆在早古生代就已拼接在一起,其后,又有印支期的俯冲和碰撞叠加,加里东期超高压变质带主要分布在北部,后者在南部,两者时     

电磁法综合探测系统研究

针对地下隐伏资源勘查对大深度、多参量电磁法技术的发展要求,利用天然场音频大地电磁的大深度探测及人工场激电法的多参量探测,在对分布式的场量接收和大功率的发射仪器硬件研制,以及数据处理资料解释研究基础上,成功研制了阵列天然场电磁法探测技术及混场源电磁法探测技术系统。经矿区试验应用表明,阵列天然场电磁法探测技术系统具有轻便高效大深度探测的特点,适宜于不同地貌景观尤其是困难条件下隐伏资源的大深度探测,而混场源电磁法探测技术系统不仅可获取大深度的天然场电阻率信息,还能获取人工场激电信息,可广泛应用于金属矿资源、地下水资源及油气资源的勘查。     

A Characteristic Analysis of the Dynamic Evolution of Preseismic- Coseismic-Postseismic Interferometric Deformation Fields Associated with the M 7.9 Earthquake of Mani, Tibet in 1997

By using the D-InSAR technique,we have acquired the temporal-spatial evolution images of preseismic-cosesimci-postseismic interferometric deformation fields associated with the M 7.9 earthquake of Mani,Tibet on 8 November 1997.The analysis of these images reveals the relationships between the temporal-spatial evolution features of the interferometric deformation fields and locking, rupturing,and elastic restoring of the source rupture plane,which represent the processes of strain accumulation,strain release,and postseismic restoration.The result shows that 10 months prior to the Mani event,a left-lateral shear trend appeared in the seismic area,which was in accordance with the earthquake fault in nature.The quantity of local deformation on the north wall was slightly larger than that on the south wall,and the deformation distribution area of the north wall was relatively large.With the event impending,the deformation of the south wall varied increasingly,and the deformation center shifted eastward.Two and half monthd before the event,the west side of the fault was still locked while the east side began to slide,implying that the whole fault would rupture at any moment.These features can be regarded as short-term precursors to this earthquake.Within the period from 16 April 1996 to two and half months before the earthquake,the most remarkable deformation zones appeared in the north and south walls,which were parallel to and about 40 km apart from the fault,with accumulated local displacements of 344 mm and 251 mm on the north and south walls,respectively.The south wall was the active one with larger displacements.Five months after the earthquake,the distribution feature of interferometric fringes was just opposite to that prior to the event,expressing evident right-lateral shear.The recovered displacements are～179 mm on the north wall and～79 mm on the south wall,close to the east side of the fault.However,in the area of the south wall far from the fault there still existed a trend of sinistral motion.The deformation of the north wall was small but recovered fast in a larger area,while the active south wall began to recover from the east section of the fault toward the WSW.