春季南黄海表层海水中二氧化碳的分布特征及其影响因素

根据2007年4月南黄海区块(SYS)表层海水中二氧化碳分压(pCO₂)的连续走航数据,结合水温(T)、盐度(S)、叶绿素 (Chla)以及pH的同步观测资料,对该海域pCO₂分布特征及其主要影响因素进行了初步探讨。分析结果表明：春季南黄海pCO₂的范围在365.2~734.9 μatm之间,平均值为548.0 μatm;最高值出现在121.5°E,33.4°N海域,最低值出现在123°E,32.3°N海域。受海水中物理、化学和生物因素的综合影响,pCO₂的分布存在较大的不均匀性,总体上表现为西部高于东部,中间高于南北两边;在苏北浅滩和鲁南海区,pCO₂与水温的变化呈正相关关系,与盐度的大小呈明显的负相关关系,而在长江入海口变化趋势则相反;此外,在整个调查海区pCO₂与叶绿素、pH基本上呈负相关关系。研究将两台检测器串联进行互校,同时利用二氧化碳标准气体对其中一台仪器进行全程校准,可连续不间断观测海水和大气中的pCO₂。该方法操作简单,获得的数据准确可靠,可为节能减排能力建设提供技术支持。     

深海风暴的原位观测

 深海风暴是高悬浮颗粒浓度水体在深海近海底的快速运动,能够损坏甚至摧毁一切障碍物,改变海底地形,影响深海底栖生态环境,但对其发生过程和沉积记录的认识尚缺乏原位观测研究。选择南海东北部台湾岸外高屏海底峡谷堤岸,通过布放锚系原位观测了2016年9月一次由浊流活动引发深海风暴的沉积物弥散发生过程,发现其表现为近海底悬浮颗粒浓度快速增加,并伴随温度升高和盐度降低。研究认为,深海风暴的沉积物弥散是海底峡谷沉积纹层形成的主要动力过程。     

华南晚古生代Zoophycos时空分布及其控制因素

 基于对华南晚古生代3条剖面Zoophycos的精细解剖和前人资料分析,识别了螺旋形和舌形Zoophycos两种形态,揭示了华南晚古生代Zoophycos时空分布具有3个方面的特征：(1) 在时间上,Zoophycos广泛分布于早-中泥盆世(埃姆斯期-艾菲尔期)、密西西比亚纪(维宪期)及中二叠世(沃德期);(2) 在空间上,Zoophycos主要发育于黔东南、湘中南、桂东北一带;(3) 临滨至浅海下部是Zoophycos的主要产出环境。研究表明,华南晚古代Zoophycos的时空分布与大气含氧量(17%—24%),气候和温度(20—25℃),海水地球化学成分(方解石海Mg/Ca<2)以及生物灭绝事件等具有耦合关系。     

南海北部天然气水合物气源系统与成藏模式

天然气水合物成矿成藏条件与油气成藏条件虽然存在差异,但亦存在共同之处,即均需要有充足烃源供给及烃源供给系统输送与有利聚集场所的时空耦合配置。为了深入研究天然气水合物与常规油气运聚成藏条件之差异,根据南海北部陆坡深水区构造沉积演化特点及油气地质条件与多年来油气及水合物勘探成果,综合剖析了油气及天然气水合物气源构成特点与流体运聚输导系统特征,同时根据地质地球物理及地球化学分析,初步研究了气源供给运聚通道系统类型与高压低温天然气水合物稳定带的时空耦合配置关系,并结合油气地质及天然气水合物成矿成藏基本地质条件,总结和建立了南海北部陆坡深水区“生物气源自生自储扩散运聚型”、“热解气源断层裂隙输导下生上储运移渗漏型”和“热解气源底辟及气烟囱输导下生上储运移渗漏型”等3种成因类型的天然气水合物成矿成藏模式,以期能为南海北部深水区天然气水合物资源预测及有利勘查目标评价优选等提供决策依据与指导。     

魏晋南北朝时期新批评方法的出现与文学批评视角的转移

伴随着文学的自觉,魏晋南北朝时期文学批评也逐渐兴盛起来。文学批评方法作为文学批评的基本要素之一也随之变得多样化。这些批评模式除传统的社会历史批评、比较批评、审美批评、伦理道德批评,还有一些现代意义上的批评方法,如心理批评、推理批评、文化批评和语言学批评等批评方法,这些新批评方法的出现,不仅对文学自觉起到了一定的推进作用,也促进了魏晋南北朝时期文学批评视角的转移。     

Sea surface temperature and terrestrial biomarker records of the last 260 ka of core MD05-2904 from the northern South China Sea

This paper reports high-resolution biomarker records of the last 260 ka for core MD05-2904 from the northern South China Sea （SCS）. The sea surface temperature （SST） record using the U37^k＇, index reveals a minimum of 21.5℃（MIS 2） and a maximum of 28.3℃（MIS 5.5）, for a temperature difference of almost 7℃, and provides the longest high-resolution U37^k＇ SST record in northern SCS. The content of odd-number long chain n-alkanes and several n-alkanes indexes such as the CPI, ACL and the C31/C27 ratio, all reveal generally higher values during the glacials and lower values during the interglaclals. Terrestrial input as Indicated by n-alkane content was mostly controlled by sea-level changes： During the glacials, lower sea-level exposed the continental shelf to enable rivers to transport more terrestrial materials to the slope; and the situation reverses during the interglacials. The n-alkane indexes changes reveal more n-alkanes from contemporary vegetation during glacials as a result of the proximity of the core site to the source region, while the increases in ACL and C81/C27 ratio during glaclals indicate a change to more grassy vegetation. However, the highest values for CPI, ACL and the C81/C27 ratio all occurred during late MIS 3, and it was suggested that this period was characterized by a strong summer monsoon-dominated humid climate which resulted in a denser vegetation for the exposed continental shelf region.     

Magnetostratigraphy of the Zanda basin in southwest Tibet Plateau and its tectonic implications

The Zanda basin is one of the very important basins at the north slope of the Himalaya Range. Thus the study of the basin strata will provide critical information about the tectonic evolution of the Himalayan Orogenic Belt. 268 oriented block samples were collected in the 750-m-thick sections of the Zanda basin. The characteristic remanent magnetization （ChRM） was isolated that decays linearly to the origin between 500℃ and 690℃for most studied samples. An age range of 9.5-2.6 Ma was estimated from the correlation between our observed polarity column and the Geomagnetic Polarity Time Scale （GPTS）. The age of the Zanda basin does not support the models that the South Tibetan Detach system （STDS） is one of the basin controlling faults. Given the sedimentological features in the basin and the tectonic features at the north edge of the basin, the Zanda basin was a half graben that was possibly controlled by the Karakorum fault on the northeast.     

Evaluation of a 3dVAR system for the South China Sea

The authors evaluate a three-dimensional variational （3dVAR） system for the South China Sea （SCS） in this study. The assimilation method applied in the system takes into consideration error correlation along each ground track and uses recursive filter for optimiza- tion. Data from three R/V cruises during the spring and summer of 1998 and the summer of 2000 are used to evaluate the system. The root-mean-square error and bias are reduced significantly and when the altimeter data are assimilated, the distribution of the error is much closer to the Gaussian distribution. Precipitation and river discharge in the southwestern SCS are reproduced, and the variability of sea surface height is efficiently transferred to the subsurface. The 3dVAR system performs well for each of the three cruises, suggesting that it is steady for routine usage.     

太原市城南供暖系统超负荷运行水力分析

以太原市城南供热系统为研究对象,对其供热管网进行了水力计算,计算得出供热管网在初、末寒期运行时的最佳流量为5000t/h,在严寒期运行时的最佳流量为6200t/h,并针对目前的超负荷运行提出了相应的改进措施。     

南煤北调系统在云冈矿的应用

将南部的煤部分调到北部以缓解南部运输系统的压力,改造南煤北调皮带系统,南煤北调皮带采用变频调速,建立和完善煤炭生产高产高效矿井地质保障系统。