http://www.sciencedirect.com/science/article/pii/S1674987114000255

Geophysical studies point to a complex tectonic and geodynamic evolution of the Alboran Basin and Gulf of Cadiz.Tomographic images show strong seismic waves velocity contrasts in the upper mantle.The high velocity anomaly beneath the Alboran Sea recovered by a number of studies is now a well established feature.Several geodynamic reconstructions have been proposed also on the base of these images.We present and elaborate on results coming from a recent tomography study which concentrates on both the Alboran and the adjacent Atlantic region.These new results,while they confirm the existence of the fast anomaly below the Alboran region,also show interesting features of the lithosphere-asthenosphere system below the Atlantic.A high velocity body is imaged roughly below the Horseshoe Abyssal plain down to sub-lithospheric depths.This feature suggests either a possible initiation or relic subduction.Pronounced low velocity anomalies pervade the upper mantle below the Atlantic region and separate the lithospheres of the two regions.We also notice a strong change of the upper mantle velocity structure going from south to north across the Gorringe Bank.This variation in structure could be related to the different evolution in the opening of the central and northern Atlantic oceans.     

东印度洋水体输运的季节变化及相关盐度变化

利用20年（1992-2012年）的ECCO2模式模拟数据,主要研究了东印度洋（EIO）水体输运的季节变化.在EIO选取3个断面,分别为赤道、80°E和6°N.研究结果表明,跨赤道和80°E的季节输运主体部分大致相补偿.跨赤道的大部分水体输运局限在上层100 m,80°E的水体输运具有复杂结构,与显著的季风流、Wyrtki Jets（WJs）、赤道潜流（EUC）等有关.6°N上层水体净输运较小,但存在较强的边界流和相对较弱的内区流.纬向流的显著变化发生在80°E.在季风盛行季节,由于WJs减弱,赤道附近的水体输运以西向的梯度流为主,上层100 m的其余区域则主要受季风流控制.同样,由于EUC减弱,西向的梯度流与次表层东向的EUC之间也存在转换.在季风转换季节,季风流减弱,WJs与EUC分别在上层100 m和次表层占主导地位.此外,本研究还讨论了与季风流、WJs和EUC相关的盐水和暖水交换,有助于了解研究区域内温度和盐度的水平和垂直结构.     

Modal Wave Number Tomography and Bottom Parameter Dependence

A shallow water tomography scheme based on the modal wave number inversion technique is considered in this paper. The scheme is based on the assumption that modal wave number for trapped modes can be measured in a suitable way. The tomographic inversion is accomplished in two steps: firstly, the bottom parameters are inverted by using the bottom reflection phase shift with the known sound speed profile; secondly, the variation of sound speed profile at different time is inverted provided the bottom parameters are known. A numerical simulation shows that the proposed scheme works well, and the sensitivity analysis of sound speed profile inversion is performed for shallow water environmental parameters: sound speed, density and attenuation coefficient of the bottom.     

行道树研究——城市生物地理学的课题

导言城市自然地理学的研究在气候学、地貌学和水文学方面已经有很大进展。但是,地理学家对于城市生物区系的研究尚未给予应有的注意。极其丰富多彩的城市植物区系,它与同样是变化多端的生境的联系,以及——更重要地——城市植物区系显著的空间变化,为地理探索提供了有价值的、富于创造性的课题。世界许多地区日益城市化的人类种群以及随之而来的与自然界的隔离,要求在城市区域加强生物学研究。人与环境的相互作用这一地理学的基本课题,在城市植被中鲜明地体现出来。     

冲冼液通过钻具接头漏失的测量

冲洗过程对钻进效果有很大影响.钻进速度、碎岩工具的磨损及钻具的安全运转都与给入钻孔的冲洗液量有关.目前为了控制冲洗规程广泛应用?PM-5型和?MP-2型流量计,它能相当准确地测定给入钻具中的冲洗液量.但是,由于冲洗液在钻具接头处有漏失,所以即使地表上最准确的测定也不可能判明孔底冲洗液的消耗量.对岩心钻探时     

非洲西北部晚元古代安山岩中的金矿化

火山岩的变质作用常被人们公认是形成众多的金矿床的一个主要成矿作用(Boyle,1979)。但是,有关火山岩的背景含金量及金自围岩中活化迁移确切机制的数据资料却是非常缺乏的。本文的目的就是确定Hosggar(非洲西北部)晚元古代女山岩内金的背景值,评价低级变质作用对金在岩石中的分布的影响以及这种低级变质作用在金矿床的形成中所起的作用。     

ON A NEW SPECIES OF CAMPTYLONEMOPSIS (CYANOPHYTA) FROM SOUTH CHINA

In the course of our studies on some old collections of marine cyanophytes in the herbarium of the Institute of Oceanology, we came across a very interesting plant characterized by (1) a crescent-shaped filament attached to the substrate with its middle portion while the two side portions growing freely and bending upwards, (2) its reproduction being carried out by heterocysts and homorgones. Careful studies showed that it is an undescribed species     

石榴石表面的颤动痕可作为古沉积物冰川作用的指示

引言观察曾经历过冰川搬运的石榴石,可见到这些石榴石颗粒表面具有特殊的颤动痕,而非冰川搬运的石榴石却未见有这种特殊的痕迹。技术的应用正如Folk(1975),Gravenor,Mclelwain和Stupavsky (1978)和Gravenor(1979)所指出,未变动的具颤动擦痕的石榴石与冰川搬运距离具有函数关系。如     

三维激发极化及电磁模拟

导言长期以来,由于缺乏足够的解释手段,电法勘探方法的应用受到了限制。为了解释资料,地球物理学家们不得不依靠物理模型实验、简单形体的解析解法,以及最近的二维模型数值解法。所有这些方法都是有用的,但是它们也都有局限性。