Diurnal Variation of Tropical Cyclone Rainfall in the Western North Pacific in 2008–10          下载免费PDF全文

SHU Hai-Long  ZHANG Qing-Hong  XU Bin 《大气和海洋科学快报》2013,6(2):103-108

Diurnal variation of tropical cyclone (TC) rainfall in the western North Pacific (WNP) is investigated using the high-resolution Climate Prediction Center’s morphing technique (CMORPH) products obtained from the National Oceanic and Atmospheric Administration (NOAA). From January 2008 to October 2010, 72 TCs and 389 TC rainfall days were reported by the Joint Typhoon Warning Center’s (JTWC) best-track record. The TC rain rate was partitioned using the Objective Synoptic Analysis Technique (OSAT) and interpolated into Local Standard Time (LST). Harmonic analysis was applied to analyze the diurnal variation of the precipitation. Obvious diurnal cycles were seen in approximately 70% of the TC rainfall days. The harmonic amplitude and phase of the mean TC rainfall rate vary with TC intensity, life stage, season, and spatial distribution. On the basis of intensity, tropical depressions (TDs) exhibit the highest precipitation variation amplitude (PVA), at approximately 30%, while super typhoons (STs) contain the lowest PVA, at less than 22%. On the basis of lifetime stage, the PVA in the decaying stage (more than 37%) is stronger than that in the developing (less than 20%) and sustaining (28%) stages. On the basis of location, the PVA of more than 35% (less than 18%) is the highest (lowest) over the high-latitude oceanic areas (the eastern ocean of the Philippine Islands). In addition, a sub-diurnal cycle of TC rainfall occurs over the high-latitude oceans. On the basis of season, the diurnal variation is more pronounced during summer and winter, at approximately 30% and 32%, respectively, and is weaker in spring and autumn, at approximately 22% and 24%, respectively.  相似文献   

疏散星团M11的研究:4.CM图、光度函数和分层效应     

束成钢  赵君亮  田凯平 《中国天文和天体物理学报》1997,(1)

利用上海天文台 40cm天体照相仪底片资料所提供的疏散星团M1 1天区 (团心距r≤2 5′)内的 785颗恒星的相对自行和成员概率 ,讨论了M1 1的CM图、年龄、距离、半径、光度函数、质量和分层效应 ,得到M1 1的距离为 1 659pc ,年龄为 (1 .8— 2 .2 )× 1 0 8年 ,半径约为 2 4 .5pc ,光度质量 4354M⊙ ,位力质量 50 0 0M⊙ ,在确定光度函数时 ,提出了一种考虑样本天区不完备的修正办法 ,以便从观测光度函数导出现时光度函数 .分析表明 ,作为一个中等年龄的疏散星团 ,M 1 1中的团星已表现出较明显的空间质量分层效应 ;而另一方面 ,尽管存在速度质量分层效应 ,但很不明显  相似文献   

Mosaic-based positioning and improved motion-estimation methods forautomatic navigation of submersible vehicles     

Negahdaripour  S. Xun Xu 《Oceanic Engineering, IEEE Journal of》2002,27(1):79-99

Knowledge of the camera trajectory, which may be determined from the motions between consecutive frames of a video clip, can be used to register images for constructing image mosaics. We discuss a mosaic-based positioning framework for building photo-mosaics and concurrently utilizing them for improved positioning. In this approach, the mosaic is directly exploited in bounding the accumulation of position errors as we integrate the incremental motions of the camera. It is also shown that two earlier closed-form solutions for the estimation of motion directly from spatio-temporal image gradients, as for most gradient-based techniques based on the application of linear(ized) image motion constraint equations, are corrupted with systematic biases. These can be reduced significantly by incorporating the higher-order terms. We propose recursive methods to solve the new nonlinear constraint equations, and investigate the performance of the new solutions in a number of experiments with synthetic and real data  相似文献   

星载铷原子频率标准的可靠性研究     

邓爱民  陈循  张春华  董理 《时间频率学报》2004,27(2):138-145

星载原子频率标准在许多空间系统中担当着重要的角色,其性能和可靠性对这些系统的功能有重要的影响。介绍了广泛使用的星载铷原子频率标准的基本工作原理,分析了影响其可靠性的各种因素,并探讨了提高其可靠性的基本途径。  相似文献   

受摄限制性三体问题平动点线性稳定性的判断条件及在Robe问题的应用   总被引：2，自引：2，他引：0  

舒斯会  陆本魁  陈务深  文福窑 《天文学报》2004,45(2):195-203

给出了受摄限制性三体问题平动点线性稳定性的一个判断条件．条件只与平动点切映像的特征方程系数有关，使用方便．用判断条件，讨论了Robe问题平动点在阻力摄动下的线性稳定性，得到了Hallan等给出的Robe问题平动点在阻力摄动下的线性稳定范围．并改进了Giordanoc等的结果．  相似文献   

Facies-controlled volcanic reservoirs of northern Songliao Basin, NE China     

WANG Pu-jun  HOU Qi-jun  SHU Ping  HUANG Yu-long  GUO Zhen-hua  LI Jin-long College of Earth Sciences  Jilin University  Changchun  Jilin  China Jilin Petroleum Company  Songyuan  Jilin  China Daqing Petroleum Company  Daqing  HeiLongjiang  China 《东北亚地学研究》2005,(Z1)

Volcanic rocks of the late Mesozoic are very important reservoirs for the commercial natural gases including hydrocarbon, carbon dioxide and rare gases in the northern Songliao Basin. The reservoir volcanic rocks include rhyolite, andesite, trachyte, basalt and tuff. Facies of the volcanic rocks can be classified into 5 categories and 15 special types. Porosity and permeability of the volcanic reservoirs are facies-controlled. Commercial reservoirs were commonly found among the following volcanic subfacies: volcanic neck (I1) , underground-explosive breccia (I3), pyroclastic-bearing lava flow (II3), upper effusive (III3) and inner extrusive ones (IV1). The best volcanic reservoirs are generally evolved in the interbedded explosive and effusive volcanics. Rhyolites show in general better reservoir features than other types of rocks do.  相似文献   

深层卤水自喷钻井若干特征的分析     

周训 《地球科学与环境学报》1992,(3)

本文以四川盆地中部的L_1井为例,讨论深层卤水自喷钻井卤水产出特征、水文地球化学特征和开采动态特征,并对钻井的测试资料进行分析,预测该钻井的卤水可采资源量。  相似文献   

记联合国亚太经社会(ESCTP)第一次浅成热液型金矿讨论会     

赵逊 《南方国土资源》1989,(3)

联合国亚太经社会主持召开的第一次浅成热液型金矿讨论会,于1989年5月9—12日在日本筑波市举行。亚太地区的16国代表参加了会议,分别就亚大地区的黄全地质勘查、开发工作的现状及前景,各国黄金工作开展情况和浅成热液型金矿代表矿床地质特征进行了交流。会后于5月13～18日前往九州进行野外考察,并现场讨论了菱刈、岩户金矿的找矿标志、成因和勘查方法。  相似文献   

Progress in the Study of Deep Profiles of Tibet and the Himalayas (INDEPTH)   总被引：5，自引：0，他引：5  

ZHAO Wenjin  ZHAO Xun  SHI Danian  LIU Kui  JIANG Wan  WU Zhenhan  XIONG Jiayu  ZHENG Yukun Chinese Academy of Geological Sciences  Beijing 《《地质学报》英文版》2004,78(4):931-939

This paper introduces 8 major discoveries and new understandings with regard to the deep structure and tectonics of the Himalayas and Tibetan Plateau obtained in Project INDEPTH, They are mainly as follows. (1) The upper crust, lower crust and mantle lithosphere beneath the blocks of the plateau form a "sandwich" structure with a relatively rigid-brittle upper crust, a visco-plastic lower crust and a relatively rigid-ductile mantle lithosphere. This structure is completely different from that of monotonous, cold and more rigid oceanic plates. (2) In the process of north-directed collision-compression of the Indian subcontinent, the upper crust was attached to the foreland in the form of a gigantic foreland accretionary wedge. The interior of the accretionary wedge thickened in such tectonic manners as large-scale thrusting, backthrusting and folding, and magmatic masses and partially molten masses participated in the crustal thickening. Between the upper crust and lower crust lies a large detachment (e.g  相似文献   

会计处理方法的选择对纳税筹划的影响          下载免费PDF全文

舒建军 《山东国土资源》2004,20(6):24-25

1纳税筹划的含义及其目的纳税筹划主要是指在国家政策的许可下,按照税收法律法规的立法导向,通过对筹资、经营、投资、理财等活动进行合理的事前筹划和安排,取得"节税"效益,最终实现企业利润最大化和企业价值最大化的一种经济活动。它主要是通过对纳税业务进行事先策划,制定一整套的纳税操作方案,从而达到节税的目的。税务筹划包含着两个层面的意思,从征税人的角度而言,他们要进行的是税收筹划;而站在纳税人的立场上,需要进行的则是纳税筹划。纳税筹划包括了避税、节税和转嫁几方面的内容。纳税筹划不是偷税,也不完全等同于避税或节税。它具…  相似文献