中国高分辨率温度和降水模拟数据的验证   总被引：17，自引：3，他引：17  

朱华忠  罗天祥 《地理研究》2003,22(3):349-359

PRISM模型是一种基于地理特征和回归统计方法生成气候图的模型。基于中国及其周边国家地区2450多个气象台站观测数据,以PRISM模型模拟生成了中国2.5′×2.5′(≈4～5km)逐月温度和降水数据。利用独立于模拟数据的中国生态系统研究网络18个野外观测站的长年气候观测数据,检验了PRISM模型的模拟结果,表明PRISM模型较好地模拟了我国温度和降水的空间分布及季节变化,除了在高山和亚热带地区由于地表覆盖和局部地形的差异影响模拟结果,其模拟值与实测值之间的趋势线同1∶1线基本一致,具有显著相关关系,其中降水效果略差  相似文献   

Phase relations in the CH₄-H₂O-NaCl system at 2 kbar, 300 to 600°C as determined using synthetic fluid inclusions     

William M Lamb  Christopher J McshaneRobert K Popp 《Geochimica et cosmochimica acta》2002,66(22):3971-3986

Synthesis of fluid inclusions in the CH₄-H₂O-NaCl system was accomplished by subjecting fractured quartz or fluorite, along with known quantities of CH₄, H₂O, and NaCl, to a pressure of 2 kbar and temperatures of 300, 400, 500, or 600°C, in sealed Au capsules. Under the elevated P-T conditions, some of the fractures healed, trapping fluids as inclusions. Microthermometric measurements conducted on the fluid inclusions show that at 2 kbar and 400 to 600°C, there are very broad regions of fluid unmixing in the CH₄-H₂O-NaCl system. For those bulk fluid compositions that lie in the two-phase (i.e., immiscible fluids) field, the high-density phase is enriched in NaCl, whereas the low-density phase is enriched in CH₄. For any given bulk composition, the degree of NaCl enrichment in the high-density phase increases, whereas the degree of CH₄ enrichment in the low-density phase decreases, as temperature increases from 400 to 600°C. Our experimental constraints on the size of the two-phase field are generally consistent with results generated using the equation-of-state GEOFLUIDS (available at http://geotherm.ucsd.edu/geofluids/). However, when comparing the compositions of coexisting immiscible fluids, as determined experimentally vs. calculated using GEOFLUIDS, we find that some relatively small but probably significant differences exist between our experiments and this equation of state.  相似文献   

The Late Cenozoic uplift – climate change paradox   总被引：3，自引：0，他引：3  

William W. Hay  Emanuel Soeding  Robert M. DeConto  Christopher N. Wold 《International Journal of Earth Sciences》2002,91(5):746-774

The geologic evidence for worldwide uplift of mountain ranges in the Neogene is ambiguous. Estimates of paleoelevation vary, according to whether they are based on the characteristics of fossil floras, on the masses and grain sizes of eroded sediments, or on calculations of increased thickness of the lithosphere as a result of faulting. Detrital erosion rates can be increased both by increased relief in the drainage basin and by a change to more seasonal rainfall patterns. The geologic record provides no clear answer to the question whether uplift caused the climatic deterioration of the Neogene or whether the changing climate affected the erosion system in such a way as to create an illusion of uplift. We suggest that the spread of C₄ plants in the Late Miocene may have altered both the erosion and climate systems. These changes are responsible for the apparent contradictions between data supporting uplift and those supporting high elevations in the past.  相似文献   

Book Review: Stratigraphic Systems: Origin and Application. By Glenn S. Visher. Academic Press,San Diego, 1999     

Kendall  Christopher G. 《Mathematical Geosciences》2002,34(2):247-248

Mathematical Geosciences -  相似文献   

Tremendous change of the earth surface system and tectonic setting of salt-lake formation in Yuncheng Basin since 7.1 Ma     

王强  李彩光  田国强  张文治  刘椿  宁联元  岳军  程自刚  何翠英 《中国科学D辑(英文版)》2002,45(2):110-122

The Yuncheng salt lake has formed under the setting of stepped subsidence of fault-blocks from the north to the south in Yuncheng Basin. In the phase of red clay accumulation during 7.1-3.6 Ma, the size of palaeo-lake was larger than the present salt lake, and palaeo-monsoon had formed. At 3.6 Ma, the northern basement in the basin raised abruptly due to the radiative effect of Qinghai-Tibet Plateau uplifting, and palaeo-lake was contracting southwards. At ca. 2.6 Ma ancient river flowed into the northern part of the basin. During ca. 2.0-1.9 Ma aerolian effect strengthened and loess started to accumulate on the most part of the basin. Since ca. 1.8-1.0 Ma the subsidence of the lake fault-block has been speeding up abruptly. As under the natural hydrogradient the salt lake received enough groundwater supply, and the rate of loess accumulation in the lake area was lower than that of subsidence of the lake fault-block, the lake could be preserved and becomes the only modern lake on Chinese Loess Plateau. Four large strengthening change records of the monsoon were found in the lake sequence of 5.8-1.9 Ma B.P.  相似文献   

流体势场中油气运移分隔槽的自动识别及运聚单元的划分   总被引：3，自引：1，他引：3       下载免费PDF全文

刘晓冬  徐景祯  李椿  于舒杰 《地质科学》2002,37(3):295-301

流体势场是控制油气二次运移的主要因素。根据网格化的流体势数据,采用基于数字高程模型的剖面识别与多边形除边脊线识别算法(PPA),可以自动地识别出流体势场中的油气运移分隔槽。在此基础上可进一步划分出油气运聚单元或含油气系统,从而为利用网格化的数值模拟结果计算不同油气运聚单元内的油气资源量提供了一种有效的方法。通过在吐鲁番—哈密盆地台北凹陷三间房组的应用,自动划分的分隔槽比人工划分的分隔槽更精细,位置更准确。  相似文献   

试论合肥中新生代盆地构造单元划分   总被引：4，自引：0，他引：4  

王亚琳  张交东  邱连贵  裴磊  徐春华 《安徽地质》2002,12(2):97-103

介绍了原有构造单元划分方案,对其存在的问题进行了剖析,根据合肥盆地布格重力异常特征,结合中、新生代沉积特点分别对盆地中、新生代构造单元进行了划分:中生代采用构造术语划分出6个二级构造单元;新生代采用盆地划分的术语划分出6个构造单元.  相似文献   

山东山城金矿I号脉矿物找矿标型     

范春光  胡大千  楚湘涛 《吉林大学学报(地球科学版)》2002,32(4):329-332,339

Ⅰ号矿脉是山城金矿区中主要的工业矿体之一。黄铁矿和石英是主要的载金矿物 ,其标型特征是在矿脉空间上有规律的分布。矿体上部的黄铁矿以聚形晶为主 ,主要是八面体和立方体聚形晶以及立方体、八面体和五角十二面体聚形晶。黄铁矿的电物理性质 ,vnp>|- 17|,α >|- 12 0 |。石英相对吸光度D1、D2 、D2 /D3 、D3 /D1、D2 + 3 /D1相对较大。矿体下部的黄铁矿晶体形态主要是立方体单晶和立方体与八面体聚形晶 ,vnp<|- 17|,α <|- 12 0 |,D1、D2 、D2 /D3 、D3 /D1、D2 + 3 /D1相对较小。依据矿物标型展布规律 ,结合矿脉金含量的分布、载金矿物黄铁矿的晶体形态和热电性 ,以及石英相对吸光度的空间展布特征 ,建立了矿物学找矿模型 ,对深部矿脉进行了预测  相似文献   

Seismicity response to stress perturbations, analysed for a world-wide catalogue   总被引：2，自引：0，他引：2  

David Marsan  Christopher J. Bean 《Geophysical Journal International》2003,154(1):179-195

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广西电视天气预报节目广告资源的差异化营销分析     

彭鸣仕  于春红  莫生兆 《气象研究与应用》2002,23(3):60-61

从差异化市场营销理论出发 ,结合对 2 0 0 0～ 2 0 0 1年广西电视天气预报节目的特性分析 ,探讨广西电视天气预报节目广告资源的差异化营销策略  相似文献