论南方岩溶山区生态环境的元素有效态

岩溶环境的元素有效态应当考虑土壤固体、岩溶水、土壤水三种载体.岩溶区富钙偏碱的地球化学背景使土壤中的元素有效态含量较低,但相对来说,岩石背景含量高的元素,其土壤中的有效态含量也明显较高.南方岩溶区强烈的岩溶作用,不但使岩石和土壤中可溶性的Ca、Mg、Na、K大量溶解于水中,而且,某些难溶元素,如Si、Al、Fe、Mn等在岩溶水和土壤水中也有一定的离子含量,使之成为植物中元素的一部分来源 .     

中国南方现今地热特征

根据中国南方地温梯度和大地热流的数据各418个,编制了中国南方地温梯度图和中国南方大地热流图,研究了中国南方现今地温梯度分布特征和大地热流分布特征.结果显示,中国南方地温梯度介于7.82～162.5℃/km,平均24.1℃/km;大地热流变化于22～220 mW/m2之间,平均值为64.2 mW/m2.东南沿海和滇西南地区为高地温梯度分布区,扬子地块为中－低温地温梯度区.地温梯度不仅与区域热构造背景有关,还显著地受地下水热活动、断裂以及地层热导率影响.中国南方大地热流东部、西南部高,中部低,且异常高值点主要沿板块边界缝合带、深大断裂活动带分布.大地热流与区域构造运动、最后一次热事件发生的时间、岩石圈拉张程度、地壳厚度、壳内高导层埋深等因素具有明显的相关性.     

南方CASS7.1在资源储量估算中的运用

随着计算机技术的发展和普及,传统地质在对矿山进行资源储量估算方法上面临严峻的挑战。用CASS7.1结合Excel进行资源储量估算具有很好的实用性。     

风景小城 四面环水有5个湖泊环绕 风景小岛 家家临水有15条河流流淌 风景小桥 户户通舟有49座桥相连接 江苏省吴江市同里镇以悠久历史典型水乡风格“东方小威尼斯”的美誉推靓了其地名俏姿

同里隶属江苏省吴江市,位于太湖之滨,京杭大运河畔,紧依上海、苏州、杭州中国南方三大著名城市,距苏州市18公里,距上海80公里,面积33公顷,被五个湖泊环抱。同里风景优美,镇外四面环水,镇内由15条河流纵横分割为7个小岛,全镇由49座     

北倚长城 境内绵延80余公里古长城有万里长城最窄处和千年长城交汇点 头枕燕山 境内有我国现存规模最宏大体系最完整的帝王陵建筑群 身偎滦水 鹫峰山禅林寺有国内现存规模最大的千年银杏园 “畿东第一城”遵化古韵古迹名胜佳境如画风景极大地拨动着游人们的心弦

遵化,头枕燕山,身偎滦水,北倚长城,西眺北京,南临津唐,东通辽沈,素有"畿东第一城"之称。遵化,自古便以"风水宝地"而被世人所称道。"万里河山有燕塞,千年风气自荆轲",充分展示了这里诱人的风貌。     

Synoptic Characteristics of Heavy Rainfall Events in Pre-monsoon Season in South China

Persistent heavy rainfall events in South China can be divided into pre-and post-monsoon-onset events according to the onset of the South China Sea Summer Monsoon. In this study, daily rainfall data from 174 stations in South China and daily NCEP/NCAR reanalysis data are used to investigate pre-monsoon-onset events. The synoptic characteristics of pre-monsoon-onset heavy rainfall events are examined in detail. It is found that 21 heavy rainfall cases happened in the pre-monsoon period between 1961 and 2005....     

2008年我国南方暴雨学术研讨会在京召开

为提升我国暴雨研究水平及暴雨监测与预测能力,促进科研与业务的互动,加强国家重大科研项目研究人员与地方各级气象业务、研究人员的沟通与交流,2008年9月26～28日,由我院973项目“我国南方致洪暴雨监测与预测的理论和方法研究”和灾害天气国家重点实验室联合主办的2008年我国南方暴雨学术研讨会在北京召开。来自全国各级气象部门的研究与业务人员140人参会,陶诗言、     

雪灾后反思 气象工作暴露出的问题

对2008年初出现在我国南方地区的雨雪冰冻灾害及成因进行介绍,对灾害发生过程中气象工作所暴露出的问题进行具体分析,并对应该如何解决以上这些问题提出了建议。     

A Preliminary Analysis of Features and Causes of the Snow Storm Event over the Southern Areas of China in January 2008

Four successive freezing rain/heavy snowfall processes occurred in the southern part of China from 11 January to 2 February 2008 （named ＂0801 Southern Snow Disaster＂ hereafter）, during which a large-scale blocking circulation lasted for a long time over the mid-high latitudes of the Euro-Asian continent. This severe event is featured with a broad spatial scale, strong intensity, long duration, and serious damage. During the event, the blocking situation in the mid-high latitudes maintained quasi-sationary, but weather systems in the lower latitudes were active. Abundant water vapor was supplied, and favorable weather conditions for ice storms were formed over the large areas across the southern part of China. The results in this paper demonstrate that the significant factors responsible for the abnormal atmospheric circulation and this severe event include： 1） the very active Arctic Oscillation （AO）, which helped the permanent maintenance of the planetary-scale waves; 2） the continuous transfer of negative vorticity from the upstream region around 50°E into the blocking area, which caused the blocking situation reinforced repeatedly and sustained for a long time; and 3） the active air currents south of the Tibetan Plateau, which ensured abundant moisture supply to the southern areas of China. The 0801 Southern Snow Disaster was accompanied by extremely severe icing. In this paper, the data from Cloud-Profile Radar onboard the satellite CloudSat are used to study the dynamic and microphysical features of this event. The results show that there existed a melting layer between 2 and 4 km, and ice particles could be found above this layer and in the layer near the ground surface. Surface temperature kept between -4℃ and 0℃ with relative humidity over 90%, which provided the descending supercooled waterdrops with favorable synoptic and physical conditions to form glaze and ice at the surface via freezing, deposition and/or accretion. Causes of the event might be, as a whole, traced back to the planetary-scale systems. The study on the polar vortex anomaly in this paper reveals that changes in the polar vortex in the stratosphere preceded those in the troposphere, especially in early December 2007, while the intensification of the polar vortex in the troposphere delayed dramatically until middle January and early February of 2008. This implies that changes in the polar vortex in the stratosphere may be a precursor of the ensuing severe event and a meaningful clue for extended forecasts of such a disaster.