An assessment of paleodepositional environment and maturity of organic matter in sediments of the Setap Shale and Belait formations in West Sabah,East Malaysia by organic geochemical methods     

Amer M. Burgan  Che Aziz Ali 《中国地球化学学报》2010,29(1):42-52

The black shale samples collected from two Neogene formations in the Klias Peninsula area, West Sabah, have been assessed and characterized in details by gas chromatography, gas chromatography-mass spectrometry and a variety of organic geochemical parameters. The aims of this study are to describe the characteristics of organic matter of these sediments in terms of source/type of the organic matter, assess its thermal maturity and paleoenvironment of deposition, based primarily on biomarker distributions. The results of both formations do not reveal significant differences within the rock extracts. The gas chromatograms of the saturated hydrocarbon fractions of the Setap Shale and the Belait formations displayed monomodal n-alkane distributions and nearly identical regular sterane compositions with a predominance of C₂₇ regular steranes. These are consistent with open marine depositional environments dominated by marine biological matter. Another related feature of these rock extracts is the presence of a high relative abundance of gammacerane, indicating anoxic marine hypersaline source depositional environment. The relatively high abundance of common land plant-derived biomarkers, such as bicadinanes and oleananes, is a clear indication of a major terrigenous input to the source of the extractable organic matter. The predominance of oleanane biomarkers in both formations is indicative of angiospermis input and Tertiary source rocks. The high C₂₉/C₃₀ hopane ratios, moderate development of C₃₃–C₃₅ hopanes, high abundance of tricyclic terpanes and a slight predominance of C₂₇ regular sterane over C₂₈ and C₂₉ steranes are characteristic features tending to suggest a significant marine influence on these source rocks, thereby suggesting a mixed source input. The 22S/(22S+22R)C₃₂ hopane ratio has reached equilibrium, and this is supported by the high maturity level as indicated by the 22S/22SC_31–33 extended hopane ratios and 20S/(20S+20R)C₂₉ regular steranes ratios.  相似文献   

45年间影响中国东海附近海区热带气旋统计特征   总被引：2，自引：2，他引：0  

赵宝庆  车永刚  孙光武 《气象科技》2009,37(5):556-559

根据1961-2005年有编号的热带气旋资料,从时间和空间两个方面统计分析了影响中国东海附近海区（117°-131°E,22°-33°N）的热带气旋特征。结果表明,统计区域内的影响热带气旋具有明显的年际变化特征,年平均频数为8.6个,年频数与厄尔尼诺具有很好的相关性,厄尔尼诺年为影响热带气旋少频年;影响热带气旋主要集中在6-10月,持续时间多在1-4天之间;影响热带气旋大多生成于菲律宾以东洋面和关岛附近洋面,从统计区域的南侧和东侧进入,主要有西北、东北和转向3条移动路径。  相似文献   

基于标准化降水指数的石家庄干旱时空特征   总被引：7，自引：0，他引：7  

车少静  李春强 《气象科技》2010,38(1):66-70

干旱是影响石家庄的主要气象灾害之一。基于1972～2006年石家庄市17个气象站的逐月降水资料,采用标准化降水指数,分析了石家庄的干旱时空分布特征。结果表明,石家庄干旱的发生程度具有阶段性特征,20世纪70年代和90年代是比较严重的干旱阶段,70年代春旱严重,到90年代夏秋旱比较严重。用主成分分析对石家庄干旱的空间分布特征进行分析,石家庄干旱在空间分布上具有显著的一致性,同时也存在一定的区域性,根据因子分析将石家庄分为北部、东部和南部3个区域,90年代后较90年代前东部和南部干旱有所增多,北部减少。  相似文献   

CE-318型太阳光度计常见问题及其解决方法     

张晓春  车慧正  魏垚 《气象科技》2010,38(1)

介绍了CE-318型太阳光度计在运行过程中容易出现的问题,分析和说明了出现问题的原因,并给出了解决办法,提出了对仪器进行日、周、月、年检查、维护注意事项。旨在为台站观测技术人员提高CE-318型观测仪器的使用、维护和检修能力,进行仪器的常规检查和维护提供参考,也为提高仪器运行的稳定性和数据质量的可靠性提供基础保障。  相似文献   

Aerosol optical properties and its radiative forcing over Yulin,China in 2001 and 2002     

车慧正  张小曳  赵剑琦 《大气科学进展》2009,26(3):564-576

The aerosol optical properties and direct radiative forcing over the Mu Us desert of northern China, acquired through a CE318 sunphotometer of the ground-based Aerosol Robotic Network (AERONET), are analyzed. The seasonal variations in the aerosol optical properties are examined. The effect of meteorological elements (pressure, temperature, water vapor pressure, relative humidity and wind speed) on the aerosol optical properties is also studied. Then, the sources and optical properties under two different cases, a dust event and a pollution event, are compared. The results show that the high aerosol optical depth (AOD) found in Yulin was mostly attributed to the occurrence of dust events in spring from the Mu Us desert and deserts of West China and Mongolia, as well as the impacts of anthropogenic pollutant particles from the middle part of China in the other seasons. The seasonal variation and the probability distribution of the radiative forcing and the radiative forcing efficiency at the surface and the top of the atmosphere are analyzed and regressed using the linear and Gaussian regression methods.  相似文献   

Spatial and Temporal Variations of Tropical Cyclones at Different Intensity Scales over the Western North Pacific from 1945 to 2005          下载免费PDF全文

YUAN Jinnan  LIN Ailan  LIU Chunxia 《Acta Meteorologica Sinica》2009,23(5):550-561

The tropical cyclone （TC） track data provided by the Joint Typhoon Warning Center （JTWC） of the U.S. Navy over the western North Pacific （including the South China Sea） from 1945 to 2005 are employed to analyze the temporal and spatial variations of TCs of different intensity scales. Most of the TCs occurred between 15° and 25°N, from the northern part of the South China Sea to the eastern part of the Bashi Channel until near 140°E. Most of the severe and super typhoons occurred over waters from the eastern part of the Bashi Channel to about 140°E. The TCs in a weakening or steady state take up a weak majority in the area west of 123°E and north of 20°N; those in an intensifying or steady state are mostly found in the area east of 123°E and south of 20°N. For severe tropical storms, typhoons, severe typhoons, and super typhoons, their average decaying rates are all greater than the respective average growing rates; for tropical storms, however, the average decaying rate is smaller than the average growing rate. Generally speaking, the stronger the TC, the faster the intensification （weakening） is. The percentage of weak TCs is higher in June to August while that of strong TCs is higher in September to November. There are annual, interannual, and interdecadal variations in the observed number （every 6 h） and frequency of TCs at different intensity scales. As far as the long-term trend is concerned, the frequency and observed number of tropical storms have a significant linear increase, but the averaged intensity and number of TCs of other intensity categories do not exhibit such a significant linear trend. In E1 Nifio years, the number and percentage of super typhoons are significantly higher, while the total number of tropical storms, severe tropical storms, typhoons, and severe typhoons is significantly lower, and the mean intensity of TCs is prominently stronger; in La Nifia years, however, the opposite comes true.  相似文献   

Spatial patterns of Tropospheric Biennial Oscillation and its numerical simulation   总被引：3，自引：0，他引：3  

郑彬  谷德军  林爱兰  李春晖 《大气科学进展》2008,25(5):815-823

In order to investigate the spatial patterns of the Tropospheric Biennial Oscillation （TBO） on the global scale, the Climate Prediction Center （CPC） Merged Analysis of Precipitation （CMAP） monthly averaged precipitation and the Climate Diagnostics Center （CDC） monthly outgoing long-wave radiation （OLR） and SST are used in conjunction with TBO bandpass-filtering. The results indicate active biennial variability in the tropical eastern-central Pacific regions. It is evident that observations reflect the biennial component of the ENSO rather than the TBO itself. Since some studies have pointed out that the TBO is a broad-scale phenomenon differing from the ENSO, to investigate the pure TBO the ENSO signal must be excluded. The Scale Interaction Experiment-FRCGC （SINTEX-F） coupled general circulation model （CGCM） developed at Japan Frontier Research Center for Global Change （FRCGC） can capture both the ENSO and the biennial signals. Air-sea interactions in the tropical eastern-central Pacific are decoupled to eliminate the effects of ENSO in a experiment by SINTEX-F and the results show that biennial variability still exists even without ENSO. It seems to mean that the TBO and ENSO are independent from each other. Furthermore, the model results indicate that the two key regions are southwest Sumatra and the tropical western Pacific for the TBO cycle.  相似文献   

测定震源深度的意义的初步讨论   总被引：32，自引：5，他引：32  

高原  周蕙兰 《中国地震》1997,13(4):321-329

在地震目录中，震源深度是地震学最基本的参数之一，然而它也是一个最不易测准的参数，ＰＤＥ报告中的震源深度以及ＵＳＧＳ和Ｈａｒｖａｒｄ大学的ＣＭＴ反演的矩心深度和利用宽频带波形的深度震相资料获得的震源深度各不相同，其含义也不同，而宽频带波形模拟得到又是一种破裂“核心”的深度。本文对不同测量手段的震源深度的不同物理意义做了初步的探讨。  相似文献   

大华北南部地区地下流体异常与南黄海6.1级地震     

鱼金子  邢玉安 《华南地震》1997,17(3):17-22

系统清理了１９９５－１９９６年大华北南部地区地下流体异常，并分析了其与１９９６年１１月９日南海Ｍｓ６．１级地震的关系，认为地下流体异常的主体是场兆，但又不能全部归属于这次地震。文中还指出了该区未来地震向ＮＷ方向迁移的可能性及其对豫交界、鲁豫次界区可能产生的影响，以及需要进一步加强的研究工作。  相似文献   

延怀盆地上地壳热流体特征及其与地震活动的关系   总被引：6，自引：0，他引：6       下载免费PDF全文

车用太  王基华  鱼金子  刘五洲  宋贯一 《地震地质》2001,23(1):49-54

系统研究了延怀盆地上地壳热流体的温度、水化学、气体化学与同位素化学特征 ,确定热水成因与大气降水渗入有关 ,并计算了热储温度与水循环深度 ,认为热水活动对中小地震活动有一定的控制作用并影响断裂活动强度  相似文献