雪峰陆内多期复合造山带震旦—三叠纪沉积演化特征

笔者通过对雪峰及其两侧震旦纪—三叠纪的地层沉积特征进行相关的野外调查和室内总结,基本明确了雪峰地区自震旦纪以来的隆凹变迁规律。根据雪峰地区的隆凹特征及古地理属性将雪峰地区震旦纪—三叠纪的构造沉积演化历程划分为五大阶段,分别为早震旦世—中奥陶世的斜坡-陆棚-盆地阶段;晚奥陶世—晚石炭世的隆起剥蚀阶段;二叠纪的碳酸盐岩台地阶段;早三叠世的碳酸盐质陆棚阶段和中三叠世—白垩纪的隆起—陆相山间盆地阶段。笔者从沉积角度证明雪峰的演化属性并非一个古陆区,而是一个多期复合叠加的陆内造山带。     

江南—雪峰地区加里东期和印支期不整合分布规律

江南—雪峰造山带的构造性质长期以来存在争议。通过对江南—雪峰地区加里东期和印支期不整合面的野外勘查,发现加里东期不整合面空间展布和影响范围分别以安化—溆浦断裂和慈利—保靖—三都断裂为界,安化—溆浦—靖州断裂东南侧为加里东运动的强烈褶皱变形区;两断裂之间为弱变形区;慈利—保靖—三都以西广大区域以垂直抬升运动为特征,没有明显的加里东期褶皱运动。印支期不整合分布规律与加里东期有一定的继承性,其空间展布以蒲圻—慈利—保靖和咸宁—鹤峰—龙山两大断裂为界。蒲圻-慈利-保靖以东为印支运动的强烈褶皱变形区,咸宁—鹤峰—龙山断裂以西为平行不整合分布区。两断裂之间为微角度不整合分布区。从不整合面的分布特征推测印支运动的影响范围向西推进更远。研究表明江南—雪峰隆起区只处于加里东期和印支期两期陆内造山运动的西边缘,而不是其构造中心。     

塔里木盆地寒武纪—奥陶纪区域地球动力学转换的沉积作用响应及其储层地质意义

为了探索塔里木盆地区域构造演化对盆地内沉积相带展布和储层发育的控制,文章在综合了前人对塔里木盆地板块构造演化研究成果的基础上,深入分析了塔里木盆地周边早古生代区域地球动力学从伸展向挤压转换的时间及其所对应的盆地内部的沉积作用响应,认为古隆起的形成演化、台内相带的分异和台内台缘高能礁滩相带的展布、沉积基准面的转换、岩性岩...     

环焦天线口径面相位分析

环焦天线具有特殊的电磁特性和应用领域.对环焦天线的口径面相位误差进行了理论和仿真分析,推导了馈源和副面位置偏差引起的相位误差、主副面之间的补偿关系以及全息测量中天线转动引起的光程差.研究结果将对环焦天线的精确面形测量和补偿提供理论依据和参考.     

季风转换期东印度洋的赤道流系结构和水文特征

基于2013-04夏季风转换期间航次观测数据,对赤道东部印度洋3支东向强流及其水文特征进行分析。结果表明,沿赤道在表层存在Wyrtki急流,在温跃层深度存在赤道潜流,它们携带着阿拉伯海的高盐水向东输运,81°E断面上,核心流量分别为4.76Sv和12.18Sv;南赤道逆流核心在5°S附近,核心流量7.4Sv,并伴有高盐特性。     

潜水埋深对疏叶骆驼刺(Alhagi sparsifoli)幼苗生长和叶片形态的影响

研究了潜水埋深(40、80、120、180、220cm)处理对一年生疏叶骆驼刺(Alhagi sparsifoli)幼苗生长和叶片形态的影响。结果表明:随着潜水埋深的增加,疏叶骆驼刺幼苗叶片厚度逐渐增加,叶片厚度在220cm埋深下最大,长度和宽度在120cm埋深下最大,且叶片长度呈优先减小的趋势;潜水埋深变化对疏叶骆驼刺株高生长影响不大,但对冠幅和分枝数的生长影响显著(p0.05);除40cm埋深处理中根系以平均1.24cm·d-1的速率扎入地下水层外,其他4个处理根系生长速率随潜水埋深的增加而增加,且180cm和220cm埋深下根系生长速率明显高于其他3个处理;根系到达220cm潜水埋深的时间为123d;幼苗生物量积累随着潜水埋深变化先增加后减小,茎叶生物量在120cm埋深处理中达到最大值,而根系生物量在180cm埋深下最大。潜水埋深变化对疏叶骆驼刺地上部分和根系生长的影响不同,潜水埋深增加有利于根系生长和根系生物量增加;以120cm为拐点,潜水埋深过浅或过深都会抑制地上部分生长;220cm潜水埋深条件下,疏叶骆驼刺生长缓慢且生物量的累积最小,表明若潜水埋深大于220cm则对幼苗生长不利。     

The sensitivity of numerical simulation to vertical mixing parameterization schemes: a case study for the Yellow Sea Cold Water Mass

The vertical mixing parameterization scheme,by providing the effects of some explicitly missed physical processes and more importantly closing the energy budgets,is a critical model component and therefore imposes significant impacts on model performance.The Yellow Sea Cold Water Mass(YSCWM),as the most striking and unique phenomenon in the Yellow Sea during summer,is dramatically affected by vertical mixing process during its each stage and therefore seriously sensitive to the proper choice of parameterization scheme.In this paper,a hindcast of YSCWM in winter of 2006 was implemented by using the Regional Ocean Modeling System(ROMS).Three popular parameterization scheme s,including the level2.5 Mellor-Yamada clo sure(M-Y 2.5),Generic Length Scale clo sure(GL S) and K-Profile Parameterization(KPP),were tested and compared with each other by conducting a series of sensitivity model experiments.The influence of different parameterization scheme s on modeling the YSCWM was then carefully examined and assessed based on these model experiments.Although reasonable thermal structure and its seasonal variation were well reproduced by all schemes,considerable differences could still be found among all experiments.A warmer and spatially smaller simulation of YSCWM,with very strong the rmocline,appeared in M-Y 2.5 experiment,while a spatially larger YSCWM with shallow mixed layer was found in GLS and KPP schemes.Among all the experiments,the discrepancy,indicated by core temperature,appeared since spring,and grew gradually by the end of November.Additional experiments also confirmed that the increase of background diffusivity could effectively weaken the YSCWM,in either strength or coverage.Surface wave,another contributor in upper layer,was found responsible for the shrinkage of YSCWM coverage.The treatment of wave effect as an additional turbulence production term in progno stic equation was shown to be more superior to the strategy of directly increasing diffusivity for a coastal region.     

Characterization and diversity of magnetotactic bacteria from sediments of Caroline Seamount in the Western Pacific Ocean

Journal of Oceanology and Limnology - Magnetotactic bacteria(MTB) are a group of microorganisms capable of orientating and swimming along magnetic fields because they contain intracellular...     

Road lateral disconnection and crossing impacts in river landscape of Lancang River Valley in Yunnan Province, China

Roads are conspicuous components in a river landscape;however,their impacts on river landscape patterns and ecological processes have not been systematically studied at the watershed scale.In this paper,the Lancang River Valley in Yunnan Province,China was selected as a case to study road lateral disconnection and crossing impacts and identify river-road network interaction.This study was primarily focused on the road impacts on soil erosion intensity and patch density by using GIS analysis at different scales and explored their distribution with terrain factors.The results showed that river density revealed spatial autocorrelation although both of the roads and rivers were distributed unevenly in the valley.The lateral road(road curvature≥1.1)proportion correlated with soil erosion intensity(p 0.01)at the small sub-basin scale.Soil erosion intensity decreased with increasing lateral road buffer width.Light erosion generally accounted for a large proportion of the erosion in the lateral road buffer zones(1.0–4.0 km),while higher class lateral roads imposed greater impacts on soil erosion than lower class roads,which primarily had a moderate erosion level.In addition,the results of road-river intersection density indicated that road crossing impacts were significantly correlated with patch density at the small sub-basin scale.Topography factor(percent of slope25°in each sub-basin had a close relationship with the ratio of total length of road line with curvature value≥1.1 to the total number of intersections.The correlation(p 0.01)between road impacts and terrain factor revealed that topography affected the road impact distribution in the Lancang River Valley.     

Erratum to: Seasonal variability of zonal heat advection in the mixed layer of the tropical Pacific

<正>Erratum to:Chinese Journal of Oceanology and Limnology Vol.31 No.6,P.1356-1367,2013http://dx.doi.org/10.1007/s00343-014-3019-4The supporting grant information on the footnote of the original version of this article needs to be altered and updated.The new information is given below.