燕山地区中、上元古界地层结构与油气保存条件分析

根据对燕山地区地层结构和岩石组成的分析,确定了以洪水庄组、铁岭组暗色泥、页岩(生)—雾迷山组白云岩(储)—洪水庄组泥、页岩(盖),以及铁岭组、下马岭组暗色泥、页岩(生)—铁岭组白云岩(储)—下马岭组泥、页岩(盖)为主的两套生储盖组合。对泥、页岩生烃指标进行了分析,确定了洪水庄组和下马岭组泥、页岩为主的两套烃源岩。结合地质演化过程的分析,认为燕山地区中、上元古界具有很好的含油气远景。     

Upper crust structure of eastern A’nyemaqên suture zone: Results of Barkam-Luqu-Gulang deep seismic sounding profile

Barkam-Luqu-Gulang deep seismic sounding profile runs from north of Sichuan Province to south of Gansu Prov- ince. It is located at the northeastern edge of Tibetan Plateau and crosses eastern A’nyemaqên suture zone. The upper crust structures around eastern A’nyemaqên suture zone and its adjacent area are reconstructed based on the arrival times of refracted Pg and Sg waves by using finite difference method, ray tracing inversion, time-term method and travel-time curve analysis. The results show that the depth variation of basement along profile is very strong as indicated by Pg and Sg waves. The basement rose in Zoigê basin and depressed in eastern A’nyemaqên suture zone, and it gradually rose again northward and then depressed. The results also indicate that eastern A’nyemaqên suture zone behaves as inhomogeneous low velocity structures in the upper crust and is inclined to- ward the south. Hoh Sai Hu-Maqên fault, Wudu-Diebu fault and Zhouqu-Liangdang fault are characterized by low velocity distributions with various scales. The distinct variation in basement depth occurred near Hoh Sai Hu-Maqên fault and Zhouqu-Liangdang fault, which are main tectonic boundaries of A’nyemaqên suture zone. Wudu-Diebu fault, located at the depth variation zone of the basement, possibly has the same deep tectonic back- ground with Zhouqu-Liangdang fault. The strongly depressed basement characterized by low velocity distribution and lateral inhomogeneity in A’nyemaqên suture zone implies crushed zone features under pinching action.     

A Numerical Simulation Study of Impacts of Historical Land-Use Changes on the Regional Climate in China Since 1700

By using the improved regional climate model (BCC_RegCM1.0), a series of modeling experiments are undertaken to investigate the impacts of historical land-use changes (LUCs) on the regional climate in China. Simulations are conducted for 2 years using estimated land-use for 1700, 1800, 1900, 1950, and 1990. The conversion of land cover in these periods was extensive over China, where large areas were altered from forests to either grass or crops, or from grasslands to crops. Results show that, since 1700, historical LUCs have significant effects on regional climate change, with rainfall increasing in the middle and lower reaches of the Yangtze River Basin, Northwest China, and Northeast China, but decreasing by different degrees in other regions. The air temperature shows significant warming over large areas in recent hundred years, especially from 1950 to 1990, which is consistent with the warming caused by increasing greenhouse gases. On the other hand, historical LUCs have obvious effects on mean circulation, with the East Asian winter and summer monsoonal flows becoming more intensive, which is mainly attributed to the amplifled temperature difference between ocean and land due to vegetation change. Thus, it would be given more attention to the impacts of LUCs on regional climate change.     

信息系统安全外联接入平台初探

根据信息系统内外网络业务数据交换的需要,本文提出一种基于主动数据交换的安全外联接入平台。安全外联接入平台不但具有安全的网络物理隔离功能,而且能提供一系列安全服务认证、授权、安全审计、入侵检测和病毒防范等。     

中国综合地球观测系统10年规划设计与国际发布

2007年11月30日,第4届地球观测峰会在南非开普敦顺利召开,地球观测再次成为世人关注的焦点.会后发布了<开普敦宣言>、地球观测组织(GEO)进展报告及GEO近期成果.科技部长万钢率中国代表团出席此次峰会,中国气象局局长郑国光再次当选为GEO的联合主席.中国作为GEO的创始国之一,两年来积极推进GEOSS 10年执行计划,在GEO国际事务中发挥了越来越重要的作用.国家科技部部署与组织了<中国综合地球观测系统十年规划>(中、英文肋编写工作,11     

A Minireview of Marine Algal Virus-Coccolithoviruses

Coccolithophorid is unicellular marine microalgae with a global distribution in temperate and sub-temperate oceanic regions and has the ability to produce ‘the coccoliths'. It is considered to be the second most productive calcifying organism on earth and becoming an important factor in the global carbonate cycle. Emiliania huxleyi is one of the only two bloom-forming coccolithophores and becomes a species crucial to the study of global biogeochemical cycles and climate modeling. Coccolithoviruse is a recently discovered group of viruses infecting the marine coccolithophorid E. huxleyi. They are a major cause of coccolithophore bloom termination, and DMSP concentration is increasing in the process of viral lysis. Phylogenetic evidences support that some genes are functional both in E. huxleyi and its virus(Eh V). Horizontal gene transfer(HGT) of multiple functionally coupled enzymes occurs in E. huxleyi and its DNA virus Eh V has been confirmed, which contributes to the diversification and adaptation of plankton in the oceans and also critically regulates virus-host infection by allowing viruses to control host metabolic pathways for their replication. Therefore, it is of particular interest to understand this host-virus interaction. On this issue, we have made a minireview of coccolithoviruses focusing on the basic characteristics, phylogenesis, horizontal gene transfer and the interaction between the host and its viruses, as well as its important role in global biogeochemical cycling.     

Trend in Observed and Projected Maximum and Minimum Temperature over N-W Himalayan Basin

Recently, study in past trends of climate variables gained significant consideration because of its contribution in adaptions and mitigation strategies for potential future changes in climate, primarily in the area of water resource management. Future interannual and inter-seasonal variations in maximum and minimum temperature may bring significant changes in hydrological systems and affect regional water resources. The present study has been performed to observe past(1970-2010) as well as future(2011-2100)spatial and temporal variability in temperature(maximum and minimum) over selected stations of Sutlej basin located in North-Western Himalayan region in India. The generation of future time series of temperature data at different stations is done using statistical downscaling technique. The nonparametric test methods, modified Mann-Kendall test and Cumulative Sum chart are used for detecting monotonic trend and sequential shift in time series of maximum and minimum temperature. Sen’s slope estimator test is used to detect the magnitude of change over a period of time on annual and seasonal basis. The cooling experienced in annual TMax and TMin at Kasol in past(1970-2010) would be replaced by warming in future as increasing trends are detected in TMax during 2020 s and 2050 s and in TMin during 2020 s, 2050 s and 2080 s under A1 B and A2 scenarios. Similar results of warming are also predicted at Sunnifor annual TMin in future under both scenarios which witnessed cooling during 1970-2010. The rise in TMin at Rampur is predicted to be continued in future as increasing trends are obtained under both the scenarios. Seasonal trend analysis reveals large variability in trends of TMax and TMin over these stations for the future periods.     

Spatial and Temporal Variability of Water Vapor Content during 1961-2011 in Tianshan Mountains,China

Based on the climate factors data and surface vapor pressure(SVP) data of 44 weather stations in Tianshan Mountains during the years 1961-2011, this paper establishes a water vapor content(WVC) estimation model according to the relationship between monthly WVC of radiosonde and corresponding SVP and analyzes the spatial and temporal variability of WVC and their causes. The results show that the WVC is linearly and negatively related to the elevation and longitude(Vertical zonality and Longitude zonality), while it was not linearly related to the latitude. The westerly wind, geographical situation and sea level elevation composed complex surface conditions to influence the spatial distribution of WVC in the Tianshan Mountains. The Mann-Kendall(M-K) statistical test shows a significant increasing trend in the mean annual WVC in Tianshan Mountains during 1961-2011(P 0.001), with a rate of 0.23 mm/decade, and indicates an abrupt turning point in 1985(P 0.001). Correlation analysis shows that the WVC are significantly correlated to the temperature, especially during the winter, but the summer WVC are significantly correlated to the precipitation. In addition, the North Atlantic Oscillation Index(NAOI)and the Arctic Oscillation Index(AOI) are significantly correlated to the winter WVC in the Tianshan Mountains. As a new Microwave radiometric profilers(MWRPs) instrument, the MP-3000 A provides continuous, real-time and high temporal resolution atmospheric profiles up to 10 km. In order to monitor water vapor and atmosphere profiles in Tianshan Mountains, an MP-3000 A was established in Urumqi(43.8°N, 87.58°N) in May 2008. The results indicated that the MP-3000 A was applicable to this area, and the evolutionary process of water vapor and the WVC peak values of MP-3000 A were a strong signal for rainstorm and flood forecasts for Urumqi and the Tianshan Mountains.     

遥感技术在新疆东部石英滩-裤子山地区盐湖硝酸盐资源评价中的应用

通过对新疆东部石英滩-裤子山地区盐湖遥感影像信息研究,在建立了盐湖相关信息遥感解译标志、总结了盐湖的空间分布规律的基础上,进行了野外地质调查,基本查明盐湖的成因类型、盐类沉积范围、卤水赋存状态、以及硝酸盐成矿地质规律和特征,并预测盐湖硝酸盐资源量可达181.18万t。