中国地磁基本台网绝对观测仪之比较     

周锦屏  程安龙 《国际地震动态》1992,(11):10-13

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The possible influences of the increasing anthropogenic emissions in India on tropospheric ozone and OH   总被引：2，自引：0，他引：2  

LIU Yu  LI Weiliang  ZHOU Xiuji  I.S.A.ISAKSEN  J.K.SUNDET  HE Jinhai 《大气科学进展》2003,20(6):968-977

A 3-D chemical transport model (OSLO CTM2) is used to investigate the influences of the increasing anthropogenic emission in India. The model is capable of reproducing the observational results of the INDOEX experiment and the measurements in summer over India well. The model results show that when NOx and CO emissions in India are doubled, ozone concentration increases, and global average OH decreases a little. Under the effects of the Indian summer monsoon, NOx and CO in India are efficiently transported into the middle and upper troposphere by the upward current and the convective activities so that the NOx, CO, and ozone in the middle and upper troposphere significantly increase with the increasing NOx and CO emissions. These increases extensively influence a part of Asia, Africa, and Europe, and persist from June to September.  相似文献   

Characteristics and formation causes of Qingdao Cold Water Mass   总被引：2，自引：0，他引：2  

张启龙  刘兴泉  程明华  于新胜 《中国海洋湖沼学报》2002,20(4):303-308

In this work,the main characteristics of the Qingdao Cold Water Mass were studied by using“the comparison analysis method”based on 1980 temperature,salinity and dissolved oxygen data on the western South Yellow Sea.The formation cause of the water mass was analyzed based on February of 1959 temperature and salinity data for this area and on some other authors’studies.The results showed that the Qingdao Cold Water Mass has growing and vanishing processes：appears in the last ten days of March;has stable pattern in April;is biggest in its area in May;becomes small in its area in June;vanishes in July.It comes from the northem Shandong Coastal Water and is characterized by low temperature and salinity and high disolved oxygen.The mass is formed under the joint effects of anticyclonic circulation and solar radiation.  相似文献   

比较行星地质学的主要科学问题     

欧阳自远 《矿物岩石地球化学通报》2006,25(Z1):197-201

根据太阳系探测的成果,对比分析类地行星大气层与水体的形成与演化过程、类地行星地形地貌与地质构造的共性与特性、类地行星的岩石类型比较、类地行星的热历史与内部结构的比较,行星的质量大小和行星与太阳的距离的相互耦合,制约了行星的形成和演化的复杂过程.  相似文献   

闽台地区近震震级ML量规函数研究   总被引：1，自引：0，他引：1  

林仙坎 《中国地震》2006,22(3):287-293

作者精心地挑选了发生在台湾地区的ML=4.0~5.0壳内地震215个,用福建台网记录到的这些地震的最大地动位移资料,利用多元回归分析方法,拟合出最大地动位移的衰减特征为logA=2.07 231.1/Δ(150km≤Δ≤650km)与之相应的量规函数的表达式为R(Δ)=3.45-231.1(1/Δ-0.01)(150km≤Δ≤650km)对于1999年9月~2005年8月发生在台湾地区地壳内的790个地震,分别利用相关部门在1997年制定的量规函数和上式所示量规函数,求出福建台网测定的平均震级及均方差。结果表明,据前者所得的平均均方差为0.20,而后者为0.18。如果在测定震级时,考虑到台基修正值,则后者为0.13;把测定的结果与台湾相关部门的测定结果进行比较,前者平均低了0.50左右,而后者高了0.08左右。  相似文献   

基于气象站资料的中国地区太阳日辐射量算法研究   总被引：2，自引：0，他引：2  

孙睿  梁璐  杨玲 《气象与环境科学》2007,30(1):24-27

现行计算水平面太阳日辐射主要有两种方式:一种是利用影响辐射的相关要素建立模型,另一种是依据实测资料进行空间插值.但后一种方法若要保证精度则需有足够多的样本.针对上述问题,利用我国不同区域67个站点的数据,在VP-RAD模型的基础上,建立了一个适用于中国地区的逐日太阳辐射算法CNR,该算法仅需要输入站点基本信息、最高最低温度和降水量.模拟结果与实际观测结果比较吻合.  相似文献   

综合评价方法在水质评价应用中的比较研究   总被引：1，自引：0，他引：1       下载免费PDF全文

吴沛  高军省 《气象与环境科学》2007,30(4):71-73

以黄河某取水口监测点19981999年的水质为评价对象,利用灰色关联分析法、模糊综合评价法和物元分析法分别进行了综合评价,结果表明,模糊综合评价和物元分析法的评价结果一致,"中心化"灰色关联法评价结果与上述两方法的评价结果一致.  相似文献   

不同GPS接收机RTK定位精度比较分析     

于兴旺  邰贺  王甫红 《测绘信息与工程》2007,32(2):21-22

讨论了高遮挡环境下采用双星接收机与单星接收机进行RTK作业时的精度问题,针对性地设计了测试方案,通过实际作业比较了其定位精度的差异。  相似文献   

Comparison of the spatial distribution of ground motion between main shocks and strong aftershocks     

吕晓健高孟潭  高战武米素婷 《地震学报(英文版)》2007,20(3):312-318

Using the ground motion attenuation relation, we calculated and compared the effective peak acceleration (EPA) generated by main shocks and their strong aftershocks of 21 earthquake sequences with MS≥7 occurred in Chinese mainland and offing of China during 1966~2002. The result shows that EPA of strong aftershocks usually exceed that of main shock for 76.2% earthquake sequences and EPA of more than 50% strong aftershocks are greatly lar-ger than that of main shocks in large area, which suggests that it is necessary to take damage produced by strong aftershock into account in the probabilistic seismic hazard analysis and the seismic design.  相似文献   

"浊积岩型金矿"质疑     

何立贤 《贵州地质》2007,24(3):196-196

明代学者陈献章说过:"学贵有疑". 读完《贵州地质》2007年1期,"浊积岩型金矿简介"一文以后,脑海中充满疑问.首先感到"简介"一文的结构比较特别.按常理,写完前4节,已完成"简介"任务,第5节似属多余.  相似文献