地球主磁场的能量密度谱及其长期变化

根据BJ地磁场模型和第8代国际地磁参考场(IGRF)模型，计算并分折了1690～2000年期间地球表面主磁场和分量的能量密度谱及其长期变化。结果表明1690～2000年期间主磁场的能量密度谱一直在减小，其主要原因是由于偶板子磁场的衰减产生的，而非偶板子磁场的能量密度谱在1690～1780年期间减小，1780～1890年增大，1890年以后快速增大。在地磁场总能谱的变化中，Z分量的贡献起主要作用。能量密度随谐波阶数的变化在半对数坐标中近似线性，非偶板子场的等效磁源深度位于核幔边界附近，n＝1，2谐波项的等效磁源位于地球内核边缘，其位置随时间变化。1780和1890年前后是地磁场变化的转折时期。能量密度谱的长期变化存在大约60a的周期规律。     

灰色系统理论在矿床经济评价中的应用

以灰色理论为基础，结合石材矿床实例，详细介绍了综合灰色聚类分析、灰色关联度分析以及灰色局势决策分析等方法的灰色经济评价方法体系，并给出了石材矿床实例应用的结果。     

The Shengli I Point Bar on the Yellow River Delta: Three-Dimensional Structures and Their Evolution

Point bars are well developed on the Yellow River delta, among which the Shengli I point bar is the most typical. The point bar, being about 4 km in length and several tens to more than 100 meters in width, is located on the south side of the Shengli Bridge in Kenli County, Dongying, Shandong. It is a typical fine-grained point bar with silt, which is predominant, some clay and minor plant debris and clay boulders. The Shengli I point bar has complicated 3-D structures. Firstly, in a plane view, it comprises mainly eight sedimentary units, bar edge, bar ridge, bar platform, bar plain, bar channel, bar gully, bar pond and bar bay, developing side by side and superimposed one by one in a complex way. Secondly, its vertical structures are very complex due to the partial superimposition of the 8 sedimentary units. Besides hydatogenesis, very intensive wind erosion, eolian, ice and meltwater actions are also visible on the Shengli I point bar. The complex form is made even more complicated because of the abo     

四川木里海相侏罗纪地层的发现及地质意义

在川滇金沙江－哀牢山结合带以东，从未发现过海相侏罗纪地层。笔者最近在其以东数百公里的四川省木里县瓦厂地区的甘孜－理塘结合带以东发现广泛分布的含层孔Claodocoropsis mirabilis，珊瑚Thecosmilia cf。Weberi Regny,Pratethmos of.discus，水螅Spongiomorpha cf.robusta等生物群的海相侏罗纪地层。此套地层下部为陆源碎屑岩，上部为富产层孔虫、珊瑚、水螅的正常广海台地相碳酸盐岩，底部以底砾岩与下伏晚三叠世曲嗄寺组平行不整合接触。其岩性、生物组合均可与西藏昌都地块侏罗纪地层对比。本区侏罗纪沉积盆 地是在晚三叠世古特提斯洋闭合的基础上，随新特提斯洋开合而发展演化的，消亡于古近纪初期。     

东南极Amery冰架与陆地冰分界线的重新划定及验证

根据无线电回波测厚 (RES)数据对东南极Amery冰架与陆地冰分界线进行了重新划定 ,指出该冰架的接地线位置最南一直向内陆延伸到 73 .2°S处 ,距冰架末端最远距离约 5 0 0km。并在该流域选取了两条具有代表性的剖面 ,分别用水面以下的冰厚度与总的冰厚度的比值、流体静力学平衡理论等进行了验证。同时对该地区所在的整个冰流系统用 5kmERS_1/DEM数据和 1kmRAMP/DEM数据 ,GPS实地测量值等对这一结论进行了验证。最后按流体静力学平衡条件对该流域的漂浮冰部分重新进行了标定     

广东沿海陆地地质灾害系统与灾害动力学

依据地质灾害发生的动力学机制以及对地表的影响深度和灾害载体的运动特征，将广东陆地地质灾害划分为三类灾害系，即表层灾害系、表－浅层灾害系和表－深层灾害系，其影响因素和动力源是大气圈、水圈、岩石圈、生物圈及人文圈（人类活动）。五大圈造成了地质灾害系的形成、演化和发展，又反过来影响这五大圈的变化。灾害系的能量源归属于三大类：日地系统、地球系统和人类系统。文中指出人类系统的能量源在地质环境和地质灾害的形成、演化中占有越来越重要的地位。     

高密度电阻率法二维反演在工程勘探中的应用

应用高密度电阻率法二维反演方法能够提高资料解释的准确性。通过几个最小二乘法反演在工程勘探中的应用实例,说明高密度电阻率法二维反演处理的优越性。     

长春腰分水岭黄土剖面常量化学元素特征及其气候意义

长春腰分水岭中更新世晚期黄土剖面的野外观察和常量化学元素分析结果表明：各层中常量化学元素的规律性变化不仅能够揭示出剖面沉积时气候干冷－湿暖的多次波动，而且与野外各层的宏观特征具有良好的对应性；该项研究对于恢复中更新世晚期古气候及其变化具有重要意义，也为松辽平原东部第四纪地层的划分与对比提供了重要证据。     

Net water vapour exchange over a mixed needle and broad-leaved forest in Changbai Mountain during autumn

Water vapour and CO2 fluxes were measured by the eddy-covariance technique above a mixed needle and broad-leaved forest with affiliated meteorological measurements in Changbai Mountain as part of China's FLUX projects since late August in 2002. Net water vapour exchange and environmental control over the forest were examined from September 1 to October 31 in 2002. To quantify the seasonal dynamics, the transition period was separated into leafed, leaf falling and leafless stages according to the development of leaf area. The results showed that (a) seasonal variation of water vapour exchange was mainly controlled by net radiation (Rn) which could account for 78.5%, 63.4% and 56.6% for leafed, leaf falling and leafless stages, respectively, while other environmental factors' effects varied evidently; (b) magnitude of water vapour flux decreased remarkably during autumn and daily mean of water vapour exchange was 24.2 mg m-2 s-1 (100%), 14.8 mg m-2 s-1 (61.2%) and 10.3 mg m-2 s-1 (42.6%) for leafed, leaf falling and leafless stage, respectively; and (c) the budget of water vapour exchange during autumn was estimated to be 87.1 kg H2O m-2, with a mean of 1427.2 g H2O d-1 varying markedly from 3104.0 to 227.5 g H2O m-2 d-1.     

卫星测高沿轨海面高的精细结构及其应用技术初探

首先介绍了频域和多尺度域中的两种沿轨测高海面高精细结构，进而提出了利用沿轨测高海面高精细结构计算平均海面高与海平面距平的新方法，最后进一步讨论了沿轨平均海面高和海平面距平的频谱和多尺度分解，以及它们随时间的变化特性。