Controls on the Northward Movement of the ITCZ over the South China Sea in Autumn: A Heavy Rain Case Study

The autumn Intertropical Convergence Zone(ITCZ) over the South China Sea(SCS) is typically held south of 10°N by prevailing northeasterly and weakening southwesterly winds. However, the ITCZ can move north, resulting in heavy rainfall in the northern SCS(NSCS). We investigate the mechanisms that drove the northward movement of the ITCZ and led to heavy non-tropical-cyclone rainfall over the NSCS in autumn of 2010. The results show that the rapid northward movement of the ITCZ on 1 and 2 October was caused by the joint influence of the equatorial easterlies(EE), southwesterly winds, and the easterly jet(EJ) in the NSCS. A high pressure center on the east side of Australia, strengthened by the quasibiweekly oscillation and strong Walker circulation, was responsible for the EE to intensify and reach the SCS. The EE finally turned southeast and together with enhanced southwesterly winds associated with an anticyclone, pushed the ITCZ north. Meanwhile, the continental high moved east, which reduced the area of the EJ in the NSCS and made room for the ITCZ. Further regression analysis showed that the reduced area of the EJ and increased strength of the EE contributed significantly to the northward movement of the ITCZ. The enhancement of the EE preceded the northward movement of the ITCZ by six hours and pushed the ITCZ continually north. As the ITCZ approached 12°N, it not only transported warm moist air but also strengthened the dynamic field by transporting the positive vorticity horizontally and vertically which further contributed to the heavy rainfall.     

Unusual Quartz Phenocrysts in a Newly Discovered Porphyritic Granite near the Giant Dongping Gold Deposit in Northern Hebei Province,China

正Objective The giant Dongping gold deposit,situated in northern Hebei Province,is the first recognized deposit among the alkaline complex-hosted gold system in China.The gold deposits in the Dongping district are usually defined as alkaline rock-related gold deposits because they are hosted     

四川垭紫罗裂陷槽西北缘（黔水地1井）发现上古生界海相页岩气

正1研究目的(Objective)目前志留系龙马溪组页岩气在四川盆地已基本实现商业开发,寒武系、震旦系和二叠纪等页岩层系也相继取得重要突破,而中国南方石炭纪地层尽管同样被认为是一套重要页岩层系,但至今仍未取得实质性突破。"垭都—紫云—罗甸"裂陷槽为一个从泥盆系开始发育的狭长海槽,裂陷槽中心内发育石炭系打屋坝组富有机质页岩,具有页岩沉积厚度大、有机质丰度高、热演化成熟度适中等特点,有较大勘探潜力。因此,为进一步探索石炭系打屋坝组页岩气形成地质条件及含气性,在裂陷槽西北缘的威水背斜部署实施了黔水地1井。     

氨水溶液解吸-压缩制冷循环的理论研究与实验

氨水溶液解吸-压缩制冷循环(简称ADAR循环)是1种以氨水溶液解吸-吸收过程取代蒸发和冷凝过程的制冷循环。对该循环进行理论分析和热力计算,并对循环的关键步骤低压发生过程进行实验。结果表明:在相同高低温下ADAR循环的理论制冷系数随低压发生过程压降幅度的减小而升高;在其他条件不变的情况下,增大冷却水进口温度,循环COP下降;增大低温热媒进口温度,循环COP升高;低压发生器的变压解吸过程可以实现。     

崂山湾日本对虾增殖放流效果的初步研究

对2008年崂山湾放流日本对虾(Penaeus japonicus Bate)群体的洄游分布、生长特征及回捕率进行了研究。结果显示日本对虾7~8月主要分布在崂山湾浅水区域(水深5 m),9月份随着水温的降低,作季节性短距离的由浅水区向深水区移动。日本对虾生长速度快,且具有雌雄生长的差异,雄虾生长较快,但雌虾能达到更大的个体。回捕调查表明,由于受浒苔灾害的影响,日本对虾放流群体的回捕率仅为0.48%。根据崂山湾的自然环境条件和日本对虾放流群体的生长特性,认为适宜的放流时间为5月下旬,合理的开捕日期应为9月1日。     

基于ArcObjects的广州地铁售票系统设计与开发

选用了ArcObjects组件结合.NET平台,进行了GIS二次开发,整合了售票业务流程与地理导航功能。     

用天然地震探测青藏高原中部地壳、上地幔结构

从西藏南部的定日、嘎拉至青海铜铁山的天然地震探测剖面，实际路线长约２０００ｋｍ，布设了约１１０台便携地震仪，记录了数百次远震和近震事件，采用多种方法进行了资料处理与解释．依据ＳＫＳ，ＰＫＳ，ｐｓ等横波分裂特征计算的青藏高原中部上地幔的地震各向异性表明：研究区各构造单元内的地震各向异性有明显变化，发现上地幔各向异性快速波的偏振方向与造山带的走向不完全一致．在雅江缝合线、崩错－嘉黎、唐古拉山口、昆仑山口几条断裂带处南、北各向异性出现显著的差异，而金沙江缝合线和班公－怒江缝合线的南、北则没有明显的各向异性变化．由Ｐ波走时残差，利用层析技术反演了４００ｋｍ深度内的速度图像，可以看出近地表１００ｋｍ范围内速度的不均匀变化与地表划分的构造单元很吻合，进一步佐证了青藏高原是由不同时期的微板块拼合而成的认识．在青藏高原中部１５０ｋｍ深度以下发现了多处低速区．在金沙江缝合带下方约２００ｋｍ深度处有一长２５０ｋｍ以上、延伸１５０ｋｍ的低速体，推测可能是一地幔柱．利用ＰＳ转换波划分的界面，显示出青藏高原北部具有低速层和高速层交替出现的地壳结构．     

基于离散裂缝网络模型裂缝储层的随机模拟——以王窑区块为例

在燕山期、喜山期构造活动作用下,王窑区块发育北东向和南北向共轭剪切裂缝。针对该裂缝进行了统计分析,并利用离散裂缝网络模型对裂缝进行了随机模拟。模拟结果表明:研究区共轭裂缝北东向较为显著,且以高角度裂缝为主。裂缝对渗透率影响较为明显,将研究区的渗透率提高到20×10-3μm2,孔隙度增加约2%。     

Transformations between Aeromagnetic Gradients in Frequency Domain

Aeromagnetic gradients are often used to enhance details or add new insights for interpretation. The gradients may be measured or derived from the total field or from transformation between horizontal and vertical gradients. At present, vertical, horizontal, and triaxial aeromagnetic gradiometers are in operation throughout the world, while the first two are used more widely. Transformations between horizontal and vertical gradients are needed for acquiring three gradient components or for checking the vali...     

湖南渣渡矿区南段至毛易矿区外围找煤前景分析

渣渡矿区南段—毛易矿区外围位于晏家铺含煤向斜至毛易含煤向斜之间,根据以往地质勘查资料分析,本区尚存在一些构造解释问题。结合生产矿井揭露煤层情况以及最新地质勘查资料,对该区段构造进行了重新厘定,认为金盘仑断层(F1)为本区主要控煤构造,是一条规模较大的由南东向北西的逆冲推覆构造,其下盘测水组(C1c)在区内呈现一向斜构造,为一隐伏含煤区,通过估算获得预测资源量(334)3 075万t。研究认为本区具有较好的找煤前景,其分析方法对进一步寻找煤炭资源勘查靶区具有实际意义。