Cycling of phosphorus in the Jiaozhou Bay   总被引：2，自引：1，他引：1  

QI Xiaohong  LIU Sumei  ZHANG Jing  REN Jingling  ZHANG Guiling 《海洋学报(英文版)》2011,30(2):62-74

Dissolved inorganic phosphorus (DIP ),dissolved organic phosphorus (DOP ),particulate inorganic phosphorus (P IP ) and particulate organic phosphorus (P OP ) in the Jiaozhou Bay (JZB) and its adjacent major rivers were analyzed during 2001–2003.DIP was the major form of dissolved phosphorus in JZB,representing 62%–83% of the total dissolved phosphorus (T DP ),and the P IP concentration generally exceeded the P OP concentration.The concentrations of phosphorus were higher in the north than in the south of th...  相似文献   

GEOCHEMICAL RECORDS OF PALAEOCLIMATIC CHANGES IN WEINANSECTION SINCE THE LAST INTERGLACIAL     

文启忠  刁桂仪  贾蓉芬  孙继敏  周厚云 《中国地理科学(英文版)》1997,7(1):39-46

ChineselOeSSischaracterizedbythegreatthicknessandgabscontinuity.ItrererdsQuaternalyclimaticoscillations(Liu,1985).Inrecentyears,scientistshavetriedtOusephysicalorchemicalparameterstOrecostructthepastclimaticchanges.FOrinstance,theparticlesizeisUSedasproxyindicatorforthewintermo~intensity(Liu,1993),stableoxygenisotopicrecordofCarbenatenodulesisusedtoreflectthetemperaturevallationsOfsoilformation(Han,1995),andrnsgneticsuSCeptibilityandCarhanatecontentareughasproxyparametersforsuxnmermourn…  相似文献   

华北地区早期背景地震活动特征与M≥7级大震危险区预测   总被引：1，自引：0，他引：1  

刁守中  郭爱香  王红卫 《高原地震》1994,(2)

本文对华北地区第三、第四活动期早期背景地震研究表明，本区早期背景地震空间分布大体勾画出相应活动期内７级以上大震活动主体区域的基本轮廓，而早期背景地震集中区指示了未来７、８级大震的可能部位。  相似文献   

Quality Control and Evaluation of the Observed Daily Data in the North American Soil Moisture Database   总被引：1，自引：0，他引：1  

Weilin LIAO  Dagang WANG  Guiling WANG  Youlong XIA  Xiaoping LIU 《Journal of Meteorological Research》2019,(3):501-518

The North American Soil Moisture Database (NASMD) was initiated in 2011 to assemble and homogenize in situ soil moisture measurements from 32 observational networks in the United States and Canada encompassing more than 1800 stations. Although statistical quality control (QC) procedures have been applied in the NASMD, the soil moisture content tends to be systematically underestimated by in situ sensors in frozen soils, and using a single maximum threshold (i.e., 0.6 m3 m-3) may not be sufficient for robust QC because of the diverse soil textures in North America. In this study, based on the in situ soil porosity and North American Land Data Assimilation System phase 2 (NLDAS-2) Noah soil temperature, the simple automated QC method is revised to supplement the existing QC approach. This revised QC method is first validated based on the assessment at 78 of the Soil Climate Analysis Network (SCAN) stations where the manually checked data are available, and is then applied to all stations in the NASMD to produce a more strict quality-controlled dataset. The results show that the revised automated QC procedure can flag the spurious and erroneous soil moisture measurements for the SCAN stations, especially for those located in high altitudes and latitudes. Relative to station measurements in the original NASMD, the quality-controlled data show a slightly better agreement with the manually checked soil moisture content. It should be noted that this quality-controlled dataset may be over-flagged for some valid soil moisture measurements due to potential errors of the soil temperature and soil porosity data, and validation in this study is limited by the availability of benchmark soil moisture data. The updated QC and additional validation will be desirable to boost confidence in the product when high-quality data become available in the future.  相似文献   

Magnetotelluric studies in the Zhangzhou Basin geothermal zone, southeastern China     

Chaofeng Wu  Xiangyun Hu  Guiling Wang 《《地质学报》英文版》2018,92(Z1):277-277

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Numerical simulation method based on tracer experiments of geothermal reinjection     

Yanguang Liu  Guiling Wang  Zhihong Zhao  Guihong Wang 《《地质学报》英文版》2018,92(Z1):343-343

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以科研项目为导向的“探究式”教学探索与实践——以GNSS原理与应用课程改革为例     

赵桂玲  王崇倡  祝会忠 《测绘与空间地理信息》2018,(6):5-7,10

为满足测绘工程专业认证人才的培养要求,将科研项目引入课堂,对"探究式"教学方法进行探索和实践,三年来在测绘工程本科专业"GNSS原理与应用"课程中开展以科研项目为导向的"探究式"教学改革实践。改革围绕课程建设、教学设计与实施等内容开展研究。教学实践证明:将前沿性、创新性、交叉性的科研项目与教学融合,有利于学生对课程内容的掌握,培养了学生的实践能力和创新能力,有力地支撑了测绘工程专业认证毕业生要求指标。  相似文献   

基于土壤地球化学分区的重金属污染风险评价——以山东省郯城县某镇为例          下载免费PDF全文

于林松  宋蕊蕊  康桂玲  范海印  胡尊芳  邵丽娟 《山东国土资源》2020,36(3):34-41

以郯城县某镇生态地球化学调查取得的土壤地球化学数据为基础,利用因子分析法将研究区划分为3个土壤地球化学分区,10个土壤地球化学亚区。每个土壤地球化学亚区的元素间彼此存在相关性,而重金属元素的含量往往决定了该土壤地球化学分区或亚区的污染状况。首次尝试以土壤地球化学分区为评价单元,对郯城县某镇耕地土壤中8项重金属污染状况进行了评价。结果表明,该区耕地土壤重金属元素含量属弱至低等变异程度,均一化程度较高,重金属污染风险低,但个别土壤分区存在Hg,Ni,Cr含量分异程度大,点位高于背景比例偏高的现象;单项污染指数中Ni,Cr的值相对偏高,表明存在单个因子人为污染的现象;内梅罗污染指数指示I-3亚区为该镇最高,存在一定的污染隐患;地累积指数指示了I-3亚区中Ni、II-1亚区中Hg的值均>1,为轻微污染等级。此次评价工作也表明,基于土壤地球化学分区的耕地土壤重金属污染评价结果与土壤环境质量评价图件反映的信息较为吻合。  相似文献   

水下动态重力数据实时采集仿真技术研究     

王傲明  李姗姗  范雕  李新星  张驰  黄炎 《海洋测绘》2022,42(1):18-24

针对难以通过水下采集真实重力数据对重力辅助惯性导航关键技术、算法模型进行实验验证与优化,基于捷联惯导反演算法和重力动态测量原理,研究构建了捷联式与平台式水下航迹重力数据实时采集仿真系统,并采用两两采样点间的重力异常之差作为新的匹配量以提高匹配量精度.依据现有器件水平,设置陀螺仪随机常值漂移为0.002°/h,加速度计随...  相似文献   

由现今小震资料研究琼北地区区域应力场和发震构造   总被引：2，自引：1，他引：1  

张新东  王晓山  沈繁銮  张小涛  孙晴  刁桂苓 《地震学报》2013,35(4):451-460

利用2000年以来海南地震台网记录的琼北地区的波形资料,采用双差法对103个地震进行重新定位,采用振幅比方法测定震源机制.在此基础上,反演了琼北地区的区域应力场,由震源位置拟合出两个震源断层面,并且计算在区域应力场作用下的滑动方式.对照历史大震的等震线,WNW走向的震源断层位于极震区中部稍偏东的地方,与等震线长轴方向相同,表明该震源断层是1605年琼山大震的发震构造;高倾角震源断层的北东盘向东南斜下方滑动,对于该盘NNW象限产生强烈拉张,以致出现罕见的陆陷成海现象.另外一条NS向震源断层恰好位于第四系火山岩和第四系盆地交界处,是区域升降运动最为强烈的地方,正断层类型的震源断层东盘下降,与沉积盆地一致.研究表明由现今小震反演的两条震源断层分别与历史大震及构造运动有关,而与浅表断裂并不重合,存在深浅构造不协调的现象.  相似文献