Characteristics of Quasi-Periodic Oscillations During Sea Fog Events

Based on the high-resolution datasets collected in a sea fog field experiment at the northern coast of South China Sea, the variations of liquid water content (LWC) and net longwave radiation flux (NLRF) during two sea fog events on 16th-17th and 18th-19th March, 2008 are exaimeed by wavelet analysis, and the cooling mechanisms for fog formation and persistence are also investigated. The main results are shown as follows. (1) Sea fog may develop and persist whether it is cloudy or not aloft. However, when there is cloud aloft the LWC is less and wind speed in sea fog is higher than that in the clear sky. (2) The quasi-periodic oscillations (QPOs) of NLRF are observed in the formation stage of the two fogs. QPOs of LWC are only found in the developing stage no matter with cloudless or cloudy condition. (3) It is likely that sea fog forms by the cooling effects of longwave radiation and develops through the vertical mixing induced by the radiative cooling at the upper level. (4) During sea fog development and persistence, other mechanisms could also play important roles in fog-layer cooling, such as turbulent heat transport and radiation transport between air-sea interfaces.     

国际地球科学研究热点与发展态势分析

本文以2007~2011年SCI E各年度居前10% 的高被引论文为统计分析源,从国际地球科学研究论文的总体概况、研究的主要国家和机构、研究热点等方面对近年来地球科学的发展现状和发展态势进行文献计量分析,旨在为相关管理部门了解地球科学研究发展态势提供参考。     

SBR污水处理装置运行参数优化

以生活污水为供试水样,通过讨论曝气时间、污泥负荷、厌氧好氧时间分配、pH值等因素对SBR反应器中污水COD去除效果的影响进行研究。结果表明:在室温(20±5)℃和进水pH值为6.45—7.55条件下,SBR反应器优化的运行参数为厌氧150 min、曝气120 min、沉淀60 min,污泥负荷为0.049—0.082 kg BOD5/kg MLSS,MLSS 3000—5000 mg.L-1。在此条件下,COD、BOD5、NH3—N、TP和SS的平均去除率分别为85.45%、95.23%、80.25%、95.04%和85.84%,出水水质可满足城镇污水处理厂污染物排放标准(GB18918-2002)一级A。     

文安Ms5.1地震前后埕古I井的水位异常变化分析

分析了文安Ms5.1级地震前后埕古I井的水位异常变化,探讨了异常机理.认为文安地震前埕古I井水位存在前兆异常,震后的几次水位变化则可能与羊二庄断层蠕动有关.     

文安Ms5．1地震前后埕古Ⅰ井的水位异常变化分析

分析了文安Ms5.1级地震前后埕古Ⅰ井的水位异常变化,探讨了异常机理,认为文安地震前埕古Ⅰ井水位存在前兆异常,震后的几次水位变化则可能与羊二庄断层蠕动有关。     

中国区域水汽输送异常与长江流域旱涝的关系

The characteristics of water vapor transport (WVT) over China and its relationship with precipitation anomalies in the Yangtze River Basin (YRB) are analyzed by using the upper-air station data in China and ECMWF reanalysis data in summer from 1981 to 2002. The results indicate that the first mode of the vertically integrated WVT is significant whose spatial distribution presents water vapor convergence or divergence in the YRB. When the Western Pacific Subtropical High (WPSH) is strong and shifts southward and westward, the Indian Monsoon Low Pressure (IMLP) is weak, and the northern part of China stands behind the middle and high latitude trough, a large amount of water vapor from the Bay of Bengal (BOB), the South China Sea (SCS) and the western Pacific forms a strong and steady southwest WVT band and meets the strong cold water vapor from northern China in the YRB, thus it is likely to cause flood in the YRB. When WPSH is weak and shifts northward and eastward, IMLP is strong, and there is nearly straight west wind over the middle and high latitude, it is unfavorable for oceanic vapor extending to China and no steady and strong southwest WVT exists in the region south of the YRB. Meanwhile, the cold air from northern China is weak and can hardly be transported to the YRB. This brings on no obvious water vapor convergence, and then less precipitation in the YRB. Foundation: International Technology Cooperation Project of the Ministry of Science and Technology of China, No. 2007DFB20210; Application Technology Research and Development Project of Sichuan Province, No. 2008NG0009; Basic Research Foundation of Institute of Chengdu Plateau, China Meteorological Administration, No.BROP2000802 Author: Jiang Xingwen (1983–), specialized in the study of climate diagnosis.     

赤峰--辽蒙交界地区地震活动性及平均波速比分析

分析了赤峰地区地质构造特征、地球动力学环境、历史中强地震活动,表明该区域具备发生中强地震的构造条件;2008年以来的地震活动表明,辽蒙交界地区存在发生5级以上中强震的危险性,该地区的波速比震前异常能够为该地区的地震中期预测提供一定的判定依据。     

辽西凸起南段沙河街组双向物源沉积模式及油气勘探意义

古近系储层发育程度一直是制约辽西凸起南段勘探突破的关键因素。运用钻井地质、磷灰石裂变径迹分析、三维地震等基础资料,针对辽西凸起南段沙河街组储层发育问题,开展精细古热史-构造演化分析、古地貌半定量刻画,对目标区沙河街组储层进行预测,结果表明：辽西凸起南段主要经历了新生代早期构造抬升、古近纪沙河街组沉积期构造沉降、东营组沉积期构造反转和新近纪构造定型4个演化时期;断裂体系可划分为长期活动型、早断早衰型、晚断晚衰型3种断裂类型;辽西凹陷具有“盆满砂溢”的先天供源条件,构造演化的分段性特征又造成辽西凸起南段形成了特殊的“链状岛湾”沉积地貌,既可以为围区提供物源,形成近源沉积体,又可以形成较大的可容纳空间,汇聚来自于辽西凹陷满溢的砂体,在辽西凸起上形成了双向供源沉积模式。以上认识推动了旅大4-3油田的油气勘探评价,且对凸起围区的油气勘探具有较好的借鉴意义。     

中国内蒙古下白垩统白彦华群胜利组的首个同位素年龄

由于丰富的煤炭资源,内蒙古的下白垩统地层具有重要的经济价值.但长期以来相关地层一直缺乏同位素测年研究,影响了区域地层对比工作的开展.本文对内蒙古锡林浩特下白垩统胜利组煤层夹层中的火山灰锆石应用LA-ICP-MS进行U-Pb法测年,结果显示胜利组5煤(层)和6煤(层)形成于大约109-107 Ma(早白垩世阿尔布期).这...     

点吸收式波浪能俘获装置结构优化方法研究

根据布设海域波浪能资源特征,对点吸收式波浪能装置结构进行优化,可有效提高装置的能量俘获效率。本文以威海褚岛北部海域为装置布设目标海域,在对该海域波浪资源特征进行统计分析的基础上,计算得到装置的直径,同时利用数值软件计算出多组工况下点吸收装置吃水深度和装置固有周期的对应关系,并利用统计学方法得出装置固有周期随吃水深度的变化规律,进而分析得出装置在该海域的最佳设计吃水深度,为点吸收波浪能装置结构优化设计提供了新的思路。该方法对于其他技术类型波浪能装置的结构优化设计同样具有借鉴意义。