古老的宇宙"来客"     

朱佛宏 《海洋地质前沿》2002,18(12):31-31

众所周知 ,将近 6 5 Ma前地球与一相当大的天体相撞。降落地点被认为是现在墨西哥南部的尤卡坦半岛沿岸区 ,那儿有一个碰撞时形成的吉格苏鲁巨形火山口。撞击的结果是大量地球的以及天体的物质被抛入大气圈中。这些物质被风带向地球上所有地区。这些堆积物 (在远离墨西哥地区的白垩系和第三系的界面上可以找到它们 )含有对地球岩石来说异常高浓度的铱。不久前 ,美国阿拉巴马州立大学的 T Wdowiak和同事们利用穆斯堡尔谱分析法研究了采自欧洲和中、北美洲边界最上层的标本 ,表明该层具有比下面的岩石更红的颜色及高含量的氢氧化铁和硫酸铁…  相似文献   

与地球磁场有关的铍     

朱佛宏 《海洋地质前沿》1994,(3):24-24

当宇宙射线的带电粒子流通过地球大气圈上层时，发生了氧和氮原子的裂变，并形成了^10Be同位素．这个过程的强度不仅与宇宙射线的数量有关，还决定于地球磁场的状态，因为地球磁场的减弱允许大量的带电粒子透入大气圈的深处．  相似文献   

科拉半岛白海集水区水体底质中的亲铜元素(Hg、Cd、Pb、As)     

Дауваиътер В А  朱佛宏 《海洋地质前沿》2007,23(9):22-23

俄罗斯欧洲部分的北方包括穆尔曼斯克地区,具有独一无二的矿物原料资源。在穆尔曼斯克区土地上有俄罗斯极大的矿山采掘、矿山加工和矿山冶金企业。它们每年从地下采出数百万吨岩石至地表,释放入大气圈、水池和流水中数千吨污染物,其中包含剧毒性的金属化合物和生物质污染物。在  相似文献   

略论我国资源环境犯罪问题     

钟其 《浙江地质》2008,(2):42-44

资源环境问题是人类经济社会发展进程中的重要伴生问题,广义是包括一切形式的资源环境情况恶化或是对生物圈、大气圈造成的一切不利影响。人类社会经济社会的发展,总是需要消耗一定的资源环境作为支撑和依托,并且这种消耗,对于资源环境而言具有负面意义。虽然人类在与自然进行的漫长斗争中,取得了一次又一次的辉煌胜利,然而每一次辉煌胜利的背后,自然界都以它特有的形式报复了人类。  相似文献   

Occurrence of microorganic pollutants in the atmosphere of Singapore during haze and non-haze periods     

Rajasekhar Balasubramanian Chanbasha Basheer Kang Lisa Siao Wei See 《中国地球化学学报》2006,25(B08):183-183

Microorganic pollutants such as polycylic aromatic hydrocarbons （PAHs）, organochlorine pesticides （OCPs）, polychlorinated biphenyls （PCBs） and total petroleum hydrocarbons （TPHs） are known to be present in urban ambient air. These organic compounds are prone to atmospheric transport and deposition over long distances, thus enabling them to accumulate even in regions remote from their sources. Deposition from the atmosphere can be via direct deposition and exchange with crops that may be directly or indirectly ingested by humans. It can also take place via wet and dry deposition and air-water exchange. Following their deposition, these microorganic pollutants tend to accumulate in soils, sediments and in human and ecological food chains. There are many reports in the literature on the atmospheric concentrations of microorganic pollutants, but there are few reports and data in Asia. This study was performed in Singapore to determine the relative amounts of persistent organic pollutants and TPHs in ambient aerosols. One of the important sources of these organic compounds in Southeast Asia is thought to be biomass burning （vegetation fires）. Hence, air sampling was conducted during both smoke haze and non-haze periods. The data obtained from this study will be presented and discussed.  相似文献   

重庆市地学旅游资源研究     

王长生  张荣  范春 《四川地质学报》2004,24(1):39-45

重庆市的地学旅游资源极其丰富，可划分为岩石圈旅游资源等4个大类、地质旅游资源等11个基本类型、地层旅游景观等18种景观和黔江县上白垩统正阳组剖面等107个景区(景点)。它们具有类型齐全、分布广泛、岩溶精品和森林独特的特点。从加强岩溶旅游资源调查等6个方面入手，就可提高对它们的开发利用程度.  相似文献   

固体生活垃圾场——技术成因地质客体     

苑惠明 《水文地质工程地质技术方法动态》2004,(6):27-28

在许多都市化地区，人类由于同地质环境的相互作用，正在承受着因不合理利用环境，尤其是在垃圾场堆积的固体生活垃圾而造成的不良后果。由于人类的经济活动必然产生固体生活垃圾，它们在地质环境的不稳定状态中起着重要作用：堆积着按垃圾构成和来源不同的，对地质介质呈高异常物质的垃圾场是积极作用在地表水和地下水、土壤和以及大气圈，最后影响到人类的作用源。  相似文献   

关于湖泊(水库)环境演变与地球化学研究的几点建议     

李世杰 《矿物岩石地球化学通报》2016,(4):608

正湖泊(水库)是地球表层系统各圈层相互作用的联结点,是陆地水圈的重要组成部分,与生物圈、大气圈、岩石圈等关系密切,具有调节区域气候、记录区域环境变化、维持区域生态系统平衡和繁衍生物多样性的特殊功能。同时,湖泊是重要的国土资源,具有调节河川径流、提供工、农业和城镇居民饮用的水源、繁衍水生生物、沟通航运、改善区域生态环境以及开发矿产等多种功能,在国民经济的发展中发挥着重要作用。然而,近几十年来,随着全球气候变  相似文献   

Some Phenomena of the Interaction Between Vegetation and a Atmosphere on Multiple Scales     

胡隐樵  陈晋北  郑元润  李国庆  左洪超 《大气科学进展》2006,23(4):639-648

This article studies the response of the distribution pattern and the physiological characteristics of the ecosystem to the spontaneous precipitation and the interaction between vegetation and the atmosphere on multiple scales in arid and semi-arid zones, based on measured data of the ecological physiological parameters in the Ordas Plateau of northern China. The results show that the vegetation biomass and the energy use efficiency of photosynthesis are especially sensitive to the annual precipitation; strong and complex interactions exist between the vegetation and the atmosphere on multiple scales leading to supernormal thermal heterogeneity of the underlying surface, the strong vortex movement and turbulence. This study can facilitate understanding of the land surface processes and the influences of global climate change as well as human activities on the human environment in the arid and semi-arid zones. It also aids in improving the parameterization schemes of turbulent fluxes of a heterogeneous underlying surface for land surface processes in climate models.  相似文献   

Study on Ozone Change over the Tibetan Plateau   总被引：2，自引：0，他引：2       下载免费PDF全文

ZHOU Xiuji  LI Weiliang  CHEN Longxun  LIU Yu 《Acta Meteorologica Sinica》2006,20(2):129-143

This paper reviewed the main results with respect to the discovery of low center of total column ozone (TCO) over the Tibetan Plateau (TP) in summer, and its formation mechanism. Some important advances are summarized as follows: The fact is discovered that there is a TCO low center over the TP in summer, and the features of the background circulation over the TP are analyzed; it is confirmed that the TP is a pathway of mass exchange between the troposphere and stratosphere, and it influences the TCO low center over the TP in summer; models reproduce the TCO low center over the TP in summer, and the formation mechanism is explored; in addition, the analyses and diagnoses of the observation data indicate that not only there is the TCO low center over the TP in summer, but also TCO decrease trend over the TP is one of the strong centers of TCO decrease trend in the same latitude; finally, the model predicts the future TCO change over the TP.  相似文献