三亚河与三亚湾溶存N_2O分布特征与影响因素研究   总被引：2，自引：0，他引：2  

孙文凭  徐继荣  殷建平  高华生  胡友木  林立 《海洋与湖沼》2010,41(2):266-273

2008年4月在三亚河设置24h观测连续站,10月在三亚湾设置13个采样站,同时采集大气、表层和底层海水样品,运用静态顶空气相色谱法对海水中溶存N2O的浓度进行了测定。结果表明,三亚湾海水中溶存N2O的浓度范围为7.57—15.04nmol/L,饱和度范围为101.8%—202.2%,均处于过饱和状态,明显受到三亚河水人为污染的影响;三亚河N2O浓度日变化范围在12.7—17.6nmol/L,饱和度范围在170.9%—236.9%,全天也均处于高度过饱和状态,表明三亚河和三亚湾都是大气N2O的源。对三亚河和三亚湾N2O浓度与盐度,营养盐的关系进行相关分析可得,其与盐度之间的关系为负相关,与硝酸盐,亚硝酸盐,氨盐的关系为正相关。此外还利用Liss提出的双层模型计算了三亚河和三亚湾的N2O海-气交换通量,分别为5.71—11.63μmol/(m2·d)、0.33—8.26μmol/(m2·d),表明三亚河与三亚湾水体中N2O的过饱和现象主要来源于城市污水的影响。  相似文献   

辽宁绥中县地质灾害发育特征及成因分析     

邵跃章  张琦 《化工矿产地质》2007,29(4):227-231

绥中县发育有不稳定斜坡(潜在危岩体崩塌、滑塌)、泥石流和海水入侵等三种主要地质灾害类型。地质灾害的分布在时间、空间上都有一定的规律,主要与地形地貌、地层岩性、人类的工程活动等因素有关。通过对该县地质灾害形成条件及影响因素的分析认为,境内地质灾害的形成和发展与地质环境固有条件密不可分,是地质灾害的先决基础条件,人类工程活动是加剧和诱发地质灾害的必然结果。  相似文献   

A sensitivity analysis of factors affecting in geologic CO2 storage in the Ordos Basin and its contribution to carbon neutrality     

《China Geology》2022,5(3):359-371

To accelerate the achievement of China’s carbon neutrality goal and to study the factors affecting the geologic CO₂ storage in the Ordos Basin, China’s National Key R&D Programs propose to select the Chang 6 oil reservoir of the Yanchang Formation in the Ordos Basin as the target reservoir to conduct the geologic carbon capture and storage (CCS) of 100000 t per year. By applying the basic theories of disciplines such as seepage mechanics, multiphase fluid mechanics, and computational fluid mechanics and quantifying the amounts of CO₂ captured in gas and dissolved forms, this study investigated the effects of seven factors that influence the CO₂ storage capacity of reservoirs, namely reservoir porosity, horizontal permeability, temperature, formation stress, the ratio of vertical to horizontal permeability, capillary pressure, and residual gas saturation. The results show that the sensitivity of the factors affecting the gas capture capacity of CO₂ decreases in the order of formation stress, temperature, residual gas saturation, horizontal permeability, and porosity. Meanwhile, the sensitivity of the factors affecting the dissolution capture capacity of CO₂ decreases in the order of formation stress, residual gas saturation, temperature, horizontal permeability, and porosity. The sensitivity of the influencing factors can serve as the basis for carrying out a reasonable assessment of sites for future CO₂ storage areas and for optimizing the design of existing CO₂ storage areas. The sensitivity analysis of the influencing factors will provide basic data and technical support for implementing geologic CO₂ storage and will assist in improving geologic CO₂ storage technologies to achieve China’s carbon neutralization goal.©2022 China Geology Editorial Office.  相似文献   

Spatial distribution characteristics and main controlling factors of germanium in soil of northern Dabie Mountains,China          下载免费PDF全文

Qiu-yao Dong  Jiao Xiang  Chao Song  Pan Wang  Hao-tian Wen  Ming-jiang Yan 《地下水科学与工程》2022,10(4):381-392

With the increasing application of germanium (Ge) elements in modern industry, military and medical health industries, especially with the growing demand for Ge-rich agricultural products, the study of Ge-rich soil has become particularly important, but the enrichment pattern and control factors of Ge-rich soil are still not well understood due to the high dispersion and high migration of Ge-rich soil. In this paper, 495 surface soil (0–20 cm) and 149 deep soil (150–200 cm) samples were collected from the northern foothills of Dabie Mountain using a double-layer grid layout, and the spatial distribution and enrichment characteristics of Ge were studied by high-resolution method, and the controlling factors affecting the distribution of Ge-rich soil was analyzed by geo-statistics and spatial analogy. The results show an average Ge content of 1.34 mg/kg for the surface and 1.36 mg/kg for the deep soil. In the assessment grade classification of surface and deep soil for Ge, the abundant and sub-abundant grades account for 37.97% and 31.70%, respectively, covering 752 km² and 634 km². Surface Ge-rich regions are distributed in concentrated strips in the north-central part of the studied region, and there is no clear pattern in the spatial distribution of deep soils. In the areas under study, such as Fenlukou, Dingji, and Jiangjiadian, the surface soil is very rich in Ge and has a high enrichment factor, which is valuable for agricultural development. In surface soils, river deposits and shallow metamorphic rock parent materials have the highest content of Ge, while in deep soils, the highest content has been found in the parent material of moderately acidic rock. Both surface and deep soils have the highest Ge content in purple paddy soils and plain areas. The source of Ge in the soils of the study area is most influenced by the lithology of the soil-forming parent material, while the distribution of Ge in the surface soils is jointly influenced by pH, SiO₂, TFe₂O₃, and Al₂O₃ in the soil. This study has implications for understanding the enrichment pattern of Ge in soil and its controlling factors as well as for the development of Ge-rich agricultural products.  相似文献   

海河流域湿地格局变化分析   总被引：4，自引：2，他引：2  

卢善龙  吴炳方  李发鹏 《遥感学报》2011,15(2):349-371

利用遥感和GIS技术,制作了海河流域1980年、1990年、2000年和2007年4期湿地分布图,分析了湿地格局变化过程与区域气候变化以及人类活动的影响.结果表明:(1)流域内天然湿地面积萎缩趋势明显,由1980年的5360 km2降至2007年的4331 km2;人工湿地面积先增加后减小,由1980年的3492 km...  相似文献   

1957-2009年南澳蒸发量变化特征及影响因子          下载免费PDF全文

林苗青  杜勤博  翁武坤 《气象与环境学报》2011,27(1):40-44

利用1957-2009年南澳县小型蒸发皿蒸发量资料,分析了南澳蒸发量的气候变化趋势.结果表明:南澳10月蒸发量最大,2月蒸发量最少;秋季蒸发量最大,夏季次之,冬季最少.1957-2009年蒸发量呈明显下降趋势,20世纪60-90年代基本上是锐减,21世纪的第1个10 a反而上升,平均以7.2mm/a的趋势下降;11月减...  相似文献   

2001-2010年辽宁区域性暴雨阶段性特征   总被引：4，自引：0，他引：4       下载免费PDF全文

公颖  陈力强 《气象与环境学报》2011,27(6):14-19

利用辽宁自动气象站逐小时降水资料和1°×1°NCEP资料,对2001-2010年汛期共25次辽宁暴雨过程进行分析,以期得到暴雨过程时间分布特征和典型影响系统.结果表明:25次辽宁暴雨过程中有7次为阶段性暴雨即两段持续性暴雨过程中间有明显的降水减弱与天气系统转换,占总数的28%;辽宁暴雨过程高层(以200 hPa为代表)...  相似文献   

原子荧光光度法测定地化样品砷不确定度评定   总被引：1，自引：0，他引：1  

韦克桥  宋江伟  张代云  艾靖娇  黎红波 《云南地质》2011,30(1):95-98

测定过程中的不确定度分量分析,并计算各分量标准不确定度及合成不确定度。通过合成标准不确定度,得出测量结果的扩展不确定度及最终结果表示:(14.8±0.50)μg/g。  相似文献   

贵州铜仁碧江区耕地土壤硒富集分布特征及影响因素研究     

沈小庆  洪万华  涂飞飞  杨炳南  张德实  韩姚飞  余万泽 《贵州地质》2021,38(4):480-486

硒是重要的人体必需微量元素,对特色农业发展起着重要的助力作用。碧江区土壤硒元素含量平均值超过贵州省及全国硒含量均值。富硒耕地面积达29426 8万亩,具有较大的富硒资源开发潜力。成土母岩为炭质页岩所形成的土壤中硒元素含量高于其他类型成土母岩所形成的土壤,强酸性土壤中硒元素含量平均值高于其他酸碱度等级土壤,水田中硒元素含量平均值显著高于旱地、果园、水浇地等其他类型土地。成土母质是土壤中硒元素的主要来源及影响因素,pH值、有机质、土壤质地等理化条件对土壤硒元素有一定影响。  相似文献   

浅谈电影片名翻译技巧     

毛妙维 《广东海洋大学学报》2006,26(2):115-120

电影不仅是作为一种艺术品，同时也是作为一种商品存在，而电影片名就好比是电影的一件外衣，因此，确切地翻译电影片名非常重要。电影片名的翻译技巧有很多，同时影响电影片名的翻译的因素也有很多。因此．在翻译电影片名时要从各方面因素考虑，从而选择恰当的翻译技巧．使得译名不仅能够从意义上忠实于源名。涵盖电影的内容，同时在形式上做到简练并具有吸引力。  相似文献