辽东本溪、营口花岗岩年龄及锆石饱和温度和Ti温度的地质意义   总被引：1，自引：0，他引：1  

韩军  夏毓亮  修群业 《矿物岩石地球化学通报》2010,29(1):1-10

对辽东本溪连山关、高家沟和营口后仙峪三个花岗岩样品进行了LA-ICPMS锆石U-Pb定年、微量元素以及全岩主量元素分析,计算了锆石饱和温度和Ti温度。连山关和高家沟花岗岩锆石U-Pb一致线上交点年龄分别为2198±31.5 Ma和2162±31 Ma,后仙峪花岗岩锆石207Pb/206Pb加权平均年龄为2204±37 Ma,在误差范围内一致地代表了辽东地区古元古代一期花岗岩浆侵位事件。三件样品Zr温度和Ti温度基本相同,平均温度分别为798℃(787~818℃)和779℃(764~797℃),与Ab-An-Or图解给出的温度范围一致。花岗岩副矿物中出现锆石和含Ti副矿物表明Zr温度和Ti温度既反映了锆石结晶温度也代表了花岗岩浆的上限温度。同时,Ti温度与Th/U、10000/Hf的关系对判断花岗岩浆熔融-结晶分异过程中体系开放程度及岩浆形成构造背景具有重要指示作用。  相似文献   

Dynamics of local extreme rainfall of super Typhoon Soudelor (2015) in East China     

Jinsong Pan  Daigao Teng  Fuqing Zhang  Lingli Zhou  Ling Luo  Yonghui Weng  Yunji Zhang 《中国科学:地球科学(英文版)》2018,61(5):572-594

The characteristics and dynamics associated with the distribution, intensity, and triggering factors of local severe precipitation in Zhejiang Province induced by Super Typhoon Soudelor (2015) were investigated using mesoscale surface observations, radar reflectivity, satellite nephograms, and the final (FNL) analyses of the Global Forecasting System (GFS) of the National Center for Environmental Prediction (NCEP). The rainfall processes during Soudelor’s landfall and translation over East China could be separated into four stages based on rainfall characteristics such as distribution, intensity, and corresponding dynamics. The relatively less precipitation in the first stage resulted from interaction between the easterly wind to the north flank of this tropical cyclone (TC) and the coastal topography along the southeast of Zhejiang Province, China. With landfall of the TC in East China during the second stage, precipitation maxima occurred because of interaction between the TC’s principal rainbands and the local topography from northeastern Fujian Province to southwestern Zhejiang Province. The distribution of precipitation presented significant asymmetric features in the third stage with maximal rainfall bands in the northeast quadrant of the TC when Soudelor’s track turned from westward to northward as the TC decayed rapidly. Finally, during the northward to northeastward translation of the TC in the fourth stage, the interaction between a mid-latitude weather system and the northern part of the TC resulted in transfer of the maximum rainfall from the north of Zhejiang Province to the north of Jiangsu Province, which represented the end of rainfall in Zhejiang Province. Further quantitative calculations of the rainfall rate induced by the interaction between local topography and TC circulation (defined as “orographic effects”) in the context of a one-dimensional simplified model showed that orographic effects were the primary factor determining the intensity of precipitation in this case, and accounted for over 50% of the total precipitation. The asymmetric distribution of the TC’s rainbands was closely related to the asymmetric distribution of moisture resulted from changes of the TC’s structure, and led to asymmetric distribution of local intense precipitation induced by Soudelor. Based on analysis of this TC, it could be concluded that local severe rainfall in the coastal regions of East China is closely related to changes of TC structure and intensity, as well as the outer rainbands. In addition, precipitation intensity and duration will increase correspondingly because of the complex interactions between the TC and local topography, and the particular TC track along large-scale steering flow. The results of this study may be useful for the understanding, prediction, and warning of disasters induced by local extreme rainfall caused by TCs, especially for facilitating forecasting and warning of flooding and mudslides associated with torrential rain caused by interactions between landfalling TCs and coastal topography.  相似文献   

青藏高原木里矿区及其周边土地覆被变化及景观格局脆弱性响应   总被引：1，自引：0，他引：1  

钱大文  颜长珍  修丽娜 《冰川冻土》2020,42(4):1334-1343

矿区开发会导致周边土地覆被及景观格局发生剧烈变化, 但目前对青藏高原典型矿区及其周边土地覆被长时间序列变化缺乏动态监测, 尤其缺乏对景观格局脆弱性响应特征的深入认识, 因此无法针对矿区合理开发和生态修复等提出有效的科学指导。通过遥感技术和土地变化科学研究手段, 以及景观格局脆弱性概念, 对青藏高原北部木里矿区及周边1975 - 2016年土地覆被时空变化和景观格局脆弱性进行分析和评估。结果表明： 木里矿区在2000年后剧烈扩张, 导致周边土地覆被面积缩减, 其中高寒草甸湿地面积损失最大, 其次为其他和高寒草甸。矿区开发对周边生态系统的间接影响效应在逐渐增大, 表现为水域面积减少, 高寒草甸湿地出现退化以及矿区发生少量逆转。受矿区扩张影响, 区域景观格局脆弱性不断增强, 可能对周边生态系统服务功能产生负面影响。因此, 未来矿区的生态修复和规划过程中, 应当优化景观格局, 降低景观格局脆弱性。研究成果可为青藏高原及其他生态脆弱地区的矿区合理开发规划及生态修复等工程提供一定参考。  相似文献   

黄海水温垂直剖面的遥感反演与数值预报模型     

修树孟  逄爱梅  申辉  张钦 《海洋科学进展》2009,27(4)

基于黄海水温垂直剖面分层结构统计分析,建立了一个卫星遥感SST反演水温垂直剖面的参数化模式,以该模式反演数据作为一维数值预报模式的初值,同时用大气预报场资料作为预报模式的过程资料,发展了一个以卫星遥感资料作为主要输入量的黄海水温垂直剖面的数值预报模型.模型实现了利用卫星遥感资料反演预报黄海水温垂直剖面的目的,5 d时效的预报效果明显优于已往强温跃层数值预报模式.  相似文献   

全球和南海海平面变化及其与厄尔尼诺的关系   总被引：6，自引：0，他引：6  

荣增瑞  刘玉光  陈满春  宗海波  修鹏  文凡 《海洋通报》2008,27(1):1-8

利用卫星高度计资料,分析了1993年1月至2004年12月全球和南海的海平面变化特征.结果表明,在1993-2004年期间,全球和南海海平面的平均上升率分别为(2.5±0.2)mm/a 和(4.8±1.2)mm/a.研究发现,全球和南海海平面的低频变化都与 El Ni(n)o 密切相关,但二者对El Ni(n)o 的响应位相相反.1997-1998年 El Ni(n)o 初期,全球平均海平面升高,呈现正异常;El Ni(n)o 后期,全球平均海平面下降并由正异常变为负异常.南海平均海平面在 El Ni(n)o 期间呈现负异常,在 La Ni(n)a期间呈现正异常,其低频变化与南方涛动指数的低频分量位相变化几乎完全一致.ENSO 可以通过南海季风和北太平洋环流(黑潮)的变化来影响南海海平面.El Ni(n)o 发生前后的北风异常,以及同期黑潮流量的变化都对 ENSO 影响南海有一定的贡献.  相似文献