巴莱斯塔斯鸟岛

秘鲁有三大奇迹：库斯科的马丘比丘印加古村、大西洋沿岸的鸟岛和西部沿海的史前纳斯卡巨幅地画。世人多数知道马丘比丘,可能连知道库斯科的人都不多,而知道纳斯卡巨幅地画和鸟岛的人就更少了。     

中国采矿史简析

正在考古遗物中发现,中国古代勤劳的先民很早就学会了勘探和开采有利用价值的矿物,明显领先于世界其他地区的文明。在辽宁抚顺煤田的废墟中,发现有古代的玉石雕刻,经测定其年龄大约是距今6000年(新石器时代)前的产物。中国北方最早的铜器是新石器时代的青铜器皿,曾被商代(16至公     

某废弃化工场地地下水有机污染健康风险评价

根据U.S.EPA的健康风险评价模型,笔者评价了某废弃化工场地对人体的健康风险,结果表明:1)该场地地下水的典型有机污染物为1,2-二氯丙烷、苯、甲苯、三氯甲烷;2)对于非致癌风险和致癌风险,3种暴露途径的健康风险顺序均为:呼吸途径>饮水途径>皮肤接触途径;3)非致癌风险中3个点超过规定限值1.0,致癌风险中4个点均超过规定限值10-6,是不可接受的。保持居住环境内空气畅通,可以在一定程度上降低健康风险。     

A case study of a Kuroshio main path cut-off event and impacts on the South China Sea in fall-winter 2013–2014

This study examines a Kuroshio main path(KMP) cut-off event east of Taiwan Island occurred in fall-winter2013–2014 and its impacts on the South China Sea(SCS) by analyzing satellite altimetry and mooring observations. Satellite altimeter sea level anomaly(SLA) images reveal a complete process that a huge cyclonic eddy(CE) from the Pacific collided with the Kuroshio and the western boundary from 15 October 2013 to 15 January 2014. Mooring observations evidenced that the Kuroshio upper ocean volume transport was cut off more than 82% from 17×106 m~3/s in September to 3×106 m~3/s in November 2013. The KMP cut-off event caused the Kuroshio branching and intruding into the SCS and strengthened the eddy kinetic energy in the northern SCS west of the Luzon Strait. Using the total momentum as a dynamic criterion to determine the role of eddy collision with the Kuroshio reasonably explains the KMP cut-off event.     

2012年夏季海南岛东岸上升流区的混合观测

The turbulent mixing in the upwelling region east of Hainan Island in the South China Sea is analyzed based on in situ microstructure observations made in July 2012. During the observation, strong upwelling appears in the coastal waters, which are 3℃ cooler than the offshore waters and have a salinity 1.0 greater than that of the offshore waters. The magnitude of the dissipation rate of turbulent kinetic energy ε in the upwelling region is O(10–9 W/kg), which is comparable to the general oceanic dissipation. The inferred eddy diffusivity K_ρ is O(10–6 m~2/s), which is one order of magnitude lower than that in the open ocean. The values are elevated to K_ρ≈O(10–4 m~2/s) near the boundaries. Weak mixing in the upwelling region is consistent with weak instability as a result of moderate shears versus strong stratifications by the joint influence of surface heating and upwelling of cold water.The validity of two fine-scale structure mixing parameterization models are tested by comparison with the observed dissipation rates. The results indicate that the model developed by Mac Kinnon and Gregg in 2003 provides relatively better estimates with magnitudes close to the observations. Mixing parameterization models need to be further improved in the coastal upwelling region.     

南海海盆中尺度涡移动速度统计分析

基于1993-2017年卫星高度计数据得到的中尺度涡追踪产品,分析了1000 m以深南海海盆中尺度涡移动速度C的时空分布特征。结果表明,南海海盆气候态平均的中尺度涡纬向移动速度c_x均为西向,经向移动速度c_y在海盆西北侧为南向,东南侧为北向。c_y随经度的变化与背景经向流的变化一致,相关系数达0.96,而c_x的变化与背景纬向流和β效应有关。c_x和C存在明显季节变化,夏季最慢,冬季最快。年际变化上,c_x和c_y的大值多发生在太平洋年代际涛动（PDO）负位相期的La Nina年。中尺度涡在其生命周期的开始和结束阶段（即生成和耗散阶段）移速较快,而在稳定的“中期”阶段移动缓慢。该趋势与涡旋转速呈反相关,相关系数为-0.93。以移速小于1.5 cm/s和大于15.4 cm/s定义的极慢和极快涡旋,分别占总涡旋数量的1.5%和1.9%。移速极慢的涡多出现在海盆的中部,且主要发生在夏季;移速极快的涡多出现在海盆的边缘,且主要发生在冬季。机制分析显示,南海海盆中尺度涡移动速度的时空分布受到大尺度背景流场调制。     

山西省基础气象资料检索系统

基础气象资料检索系统是山西省气象局2011年青年基金课题《基础气象资料检索系统》的具体实现,根据科研工作对气象资料的需求,基于B／S构架,系统利用动态网页技术和数据库技术,发挥气象部门局域网优势,使得用户可以通过WEB浏览器访问系统,以实现相关气象资料的查询。     

山西省绛县大气环境容量研究

本文分析了山西省绛县大气环境质量状况和大气污染物排放特点,用A—P—S法计算出绛县的大气环境容量以及现状各污染源的允许排放量,并分析了全县以及各乡镇的大气环境容量剩余状况,提出了绛县大气污染防治对策措施建议。     

北冰洋油气资源之争“冰融相见”

加拿大总理哈珀在视察军事演习时说,随着一些国家对北极地区所蕴藏资源的兴趣与日俱增,加拿大必须继续加强行使主权并保卫其高纬度北极地区的安全,因而“纳努克行动”的重要性也不断增加     

利用瑞雷面波反演华北克拉通东北部边界的岩石圈结构

运用瑞雷面波相速度频散曲线分析和反演得到了华北克拉通东北部边界及其邻近区域岩石圈的精细S波速度结构.利用11个地震事件、60个台站的瑞雷面波波形资料,得到了周期从25-150 S的相速度频散曲线,并且通过线性反演方法得到了深度从40-300 km的S波速度结构.结果表明,该研究区域S波速度存在强烈的不均匀性.从东南部的...