Gases in Taiwan mud volcanoes: Chemical composition,methane carbon isotopes,and gas fluxes     

Hung-Chun Chao  Chen-Feng You  Chih-Hsien Sun 《Applied Geochemistry》2010

Mud volcanoes are important pathways for CH₄ emission from deep buried sediments; however, the importance of gas fluxes have hitherto been neglected in atmospheric source budget considerations. In this study, gas fluxes have been monitored to examine the stability of their chemical compositions and fluxes spatially, and stable C isotopic ratios of CH₄ were determined, for several mud volcanoes on land in Taiwan. The major gas components are CH₄ (>90%), “air” (i.e. N₂ + O₂ + Ar, 1–5%) and CO₂ (1–5%) and these associated gas fluxes varied slightly at different mud volcanoes in southwestern Taiwan. The Hsiao-kun-shui (HKS) mud volcano emits the highest CH₄ concentration (CH₄ > 97%). On the other hand, the Chung-lun mud volcano (CL) shows CO₂ up to 85%, and much lower CH₄ content (<37%). High CH₄ content (>90%) with low CO₂ (<0.2%) are detected in the mud volcano gases collected in eastern Taiwan. It is suggestive that these gases are mostly of thermogenic origin based on C₁ (methane)/C₂ (ethane) + C₃ (propane) and δ¹³C_CH4 results, with the exception of mud volcanoes situated along the Gu-ting-keng (GTK) anticline axis showing unique biogenic characteristics. Only small CH₄ concentration variations, <2%, were detected in four on-site short term field-monitoring experiments, at Yue-shi-jie A, B, Kun-shui-ping and Lo-shan A. Preliminary estimation of CH₄ emission fluxes for mud volcanoes on land in Taiwan fall in a range between 980 and 2010 tons annually. If soil diffusion were taken into account, the total amount of mud volcano CH₄ could contribute up to 10% of total natural CH₄ emissions in Taiwan.  相似文献   

青岛沧口断裂的地质构造特征与第四纪活动性研究   总被引：1，自引：1，他引：0  

郭玉贵  邓志辉  尤惠川  黄永华  刘保华  楚全芝  丁志峰  唐方头  吴金龙  金秉福  秦小光  孟繁友 《震灾防御技术》2007,2(2):102-115

本文根据青岛市活断层探测与地震危险性评价项目初查阶段第四纪地层分析、遥感影像解译、地球化学探测、地质地貌调查与探槽开挖、浅层地震勘探与钻孔探测、地质年代测定等获得的丰富的第一手资料,对青岛沧口断裂的地质构造特征和第四纪活动性进行了详细分析与综合研究,结果表明:沧口断裂经历多期构造变动,是本区的重要断裂之一,它由多支断层组成,控制了中生代的火山活动、盆地沉积和岩浆侵入以及晚第四纪的盆地沉积、山体隆升和水系发育;第四纪以来,沧口断裂的主要活动发生于中更新世晚期至晚更新世早期,表现出中高角度向南东倾的逆冲活动特点,错断了上更新统底面1—6m,而最新活动时代为晚更新世中期,以走滑活动为主,垂直错距0.2—1.1m。  相似文献   

Eight new quasars discovered by the Guoshoujing Telescope (LAMOST) in one extragalactic field     

Xue-Bing Wu  Zhen-Dong Jia  Zhao-Yu Chen  Wen-Wen Zuo  Yong-Heng Zhao  A-li Luo  Zhong-Rui Bai  Jian-Jun Chen  Hao-Tong Zhang  Hong-Liang Yan  Juan-Juan Ren  Shi-Wei Sun  Hong Wu  Yong Zhang  Ye-Ping Li  Qi-Shuai Lu  You Wang  Ji-Jun Ni  Hai Wang  Xu Kong  Shi-Yin Shen 《中国天文和天体物理学报》2010,10(8)

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强沙尘暴天气形成机制个例分析   总被引：5，自引：0，他引：5  

张海霞  尤凤春  周伟灿  王连喜 《气象科技》2007,35(1):101-106

从气候背景、天气形势、地形作用、沙尘形成热力和动力学机制等方面,分别对2005年4月19、20日两天发生在冀南地区的扬沙、沙尘暴天气进行分析。结果表明:对流层低层横切变线和华北地形槽的存在使冀南地区沙尘天气加剧;沙尘发生前冀南弱辐合上升运动和上冷下暖的不稳定垂直结构可以迫使当地沙尘向空中扬起,上游地区较强的上升运动将当地的沙尘垂直输送到空中,在高空强西北气流的引导下将沙尘水平输送到下游地区;沙尘天气发生在上游地区对流层螺旋度最大正值区的下游,对流层螺旋度大小对沙尘暴预报有一定的指示意义。  相似文献   

潜艇作战系统数字孪生体应用需求分析          下载免费PDF全文

罗浩  张剑锋  宁云晖  尤岳 《数字海洋与水下攻防》2021,4(3):233-237

目前潜艇作战系统数字孪生体的有关研究并不多见,在对数字孪生技术概念内涵进行描述的基础上,结合潜艇作战系统全寿命周期,对其数字孪生体的军事应用需求进行了深入分析,提出了有关应用面临的问题并探讨了解决思路及方法,可为潜艇作战系统数字孪生体的方案设计提供参考借鉴。  相似文献   

老矿区深部资源量预测的地球化学方法——以江西九江城门山铜矿深部铜资源量预测为例     

龚鹏  龚敏  熊燃  赵波  王磊  马振东  贾先巧  石伟民  张星培  寸金鸿 《地质通报》2010,29(203):414-420

老矿区面临着提高资源保障能力和保证矿山长远发展的挑战,对其深部资源量进行预测具有重要的现实意义。以江西城门山铜矿深部铜资源量的预测为例,以富Cu地质体为资源量计算对象,通过函数拟合积分和三维地质体可视化模型,探讨用面金属量积分法和三维地质体块段法进行深部铜资源量预测的原理和具体操作流程。最后尝试利用这2种方法计算第一空间(0～-500m)和预测第二空间(-500～-1000m)的资源量。结果表明：第一空间2种方法均可行,计算结果与传统的储量计算结果十分接近;第二空间资源量预测以三维地质体块段法为宜。当铜矿体边界品位指标分别为0.3%和0.2%时,三维地质体块段法预测深部资源量为57.97×104t和137.58×104t,深部铜资源量主要集中在似层状含Cu黄铁矿中(Ⅰ号矿体)。  相似文献   

Earth fissures in Jiangsu Province,China and geological investigation of Hetang earth fissure   总被引：1，自引：0，他引：1  

G. Y. Wang  G. You  B. Shi  Z. L. Qiu  H. Y. Li  M. Tuck 《Environmental Earth Sciences》2010,60(1):35-43

Earth fissures are a geohazard in Jiangsu Province, China. They can be caused by earthquakes and active faults, underground mining, groundwater extraction and landslides. In order to establish a provincial rehabilitation plan in Jiangsu, a range of monitoring programs, surveys, geological investigations and modeling have been implemented or planned. One of the focuses of the project is the land subsidence and earth fissures caused by excessive groundwater withdrawal in Suzhou, Wuxi and Changzhou (Su-Xi-Chang) area, southern Jiangsu Province. Hetang earth fissure within the Su-Xi-Chang area was first reported in 1995 and a series of investigation has been conducted since then. The site investigations and geophysical survey in 1997 have recognized the causative factor as the excessive groundwater drawdown coupled by the underlying bedrock ridge. An open trench excavation in 2007 and a plane strain analysis suggest that Hetang earth fissures may have cracked from the bedrock ridge to ground surface. Geological drilling in 2007 has further confirmed the existence and configuration of the ridge and extracted soil samples for laboratory tests to obtain soil parameters for numerical analyses and modeling of land subsidence and earth fissures in the Su-Xi-Chang area, Jiangsu, China. The laboratory tests are currently in progress and the result of numerical analyses and modeling is expected to be presented in the near future.  相似文献   

Estimating Black Hole Masses of AGNs using Ultraviolet Emission Line Properties     

Min-Zhi Kong  Xue-Bing Wu  Ran Wang  Jin-Lin Han National Astronomical Observatories  Chinese Academy of Sciences  Beijing  Department of Astronomy  Peking University  Beijing 《中国天文和天体物理学报》2006,6(4):396-410

Based on measured broad line region sizes in the reverberation-mapping AGN sample, two new empirical relations are introduced to estimate the central black hole masses of radio-loud high-redshift (z > 0.5) AGNs. First, using the archival IUE/HST spectroscopy data at UV band for the reverberation-mapping objects, we obtained two new empirical relations between the BLR size and Mg II/C IV emission line luminosity. Secondly, using the newly determined black hole masses of the reverberation-mapping sample as calibration, we found two new relationships for determining the black hole mass with the full width at half maximum and the luminosity of Mg II/C IV line. We then apply the relations to estimate the black hole masses of the AGNs in the Large Bright Quasar Survey and a sample of radio-loud quasars. For the objects with small radio-loudness, the black hole mass estimated using the RBLR-LMgII/C IV relation is consistent with that from the RBLR-L3000 (?)/1350(?) relation. For radio-loud AGNs, however, the mass estimated from the RBLR-LMgII/CIV relation is sys- tematically lower than that from the continuum luminosity L3000(?)/1350(?). Because jets could have significant contributions to the UV/optical continuum luminosity of radio-loud AGNs, we emphasize once again that for radio-loud AGNs, the emission line luminosity may be a better tracer of the ionizing luminosity than the continuum luminosity, so that the relations between the BLR size and UV emission line luminosities should be used to estimate the black hole masses of high redshift radio-loud AGNs.  相似文献   

Further testing of the integrated hydrology model (InHM): multiple‐species sediment transport     

Qihua Ran  Christopher S. Heppner  Joel E. VanderKwaak  Keith Loague 《水文研究》2007,21(11):1522-1531

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Simplified formulae system for resonant inverse Compton scattering of a fast electron in an intense magnetic field     

J. H. You  W. P. Chen  S. N. Zhang  L. Chen  D. B. Liu  C. K. Chou 《Monthly notices of the Royal Astronomical Society》2003,340(2):687-693

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