The westerly anomalies over the tropical pacific and their dynamical effect on the enso cycles during 1980–1994

In this paper, the zonal wind anomalies in the lower troposphere over the tropical Pacific during 1980–1994 are analyzed by using the observed data. The results show that during the formation of the 1982/83, 1986/87 and 1991 / 92 ENSO events, there were the larger westerly anomalies in the lower troposphere over the equatorial Pacific. Moreover, it is explained by using the correlation analyses that the westerly anomalies over the equatorial Pacific could cause the warm episodes of the equatorial central and eastern Pacific. A simple air-sea coupled model is used to discuss theoretically the dynamical effect of the observed westerly anomalies of wind stress near the sea surface of the equatorial Pacific on the ENSO cycle occurred in the period of 1981–1983. It is shown by using the theoretical calculations of the equatorial oceanic Kelvin wave and Rossby waves responding to the forcing of the observed anomalies of zonal wind stress near the sea surface of the equatorial Pacific that the westerly anomalies of wind stress near the sea surface of the equatorial Pacific make significant dynamical effect on the ENSO cycles occurred in the period of 1982–1983.     

Regionalized difference of the 660 km discontinuity beneath Izu-Bonin

Introduction The detail structure of the Earths interior is a major field of geophysics and the existences and properties of mantle discontinuities are its important content. Based on the seismic tomographic results (Fukao, et al, 1992, Van der Hilst, et al, 1991) and the distribution of earthquake hypocenters in the Circum-Pacific region and other regions, the effects of subducting slab at different regions on the 660 km discontinuity are different: some subducting slabs penetrate through; …     

对俯冲带深震成因的探讨

根据一种准动力学计算方案,用有限元方法计算了不同模型俯冲带的热结构．在此基础上计算了俯冲带的密度分布和P波速度异常．通过与地震波探测结果和实验室破裂实验结果的对比,指出400 km以下俯冲带的地震可能由反裂纹机制所控制．      

淄博市人工影响天气作业决策指挥系统

根据当地地理和气候特点建立的人工影响天气作业指挥系统，体现了智能化、积累型的特点，使人工影响天气作业指挥向客观化、自动化迈进了一步，提高了人工影响天气的作业效果。     

世界上最古老的沉积海泡石矿床——华北中元古代沉积海泡石矿

华北中元古代沉积海泡石产于燕山裂陷槽内，赋存于蓟县系雾迷山组韵律的底层，呈多层产出，并集中成组出现。矿层延伸稳定，海泡石含量随与山海关古陆的距离加大而减少。与国内外同类型矿床相比，本矿床具有成矿时代的古老性、万丈和作用的特殊性和保存条件的优越性3个突出特点。     

地球内部间断面研究的地震学方法

总结了近年来较为突出的几种研究地球内部间断面的方法及有关工作。其中包括：Ｓｈｅａｒｅｒ对全球数字台网数据进行叠加，使间断面震相易于识别，找到间断面存在的地震学证据；Ｈｅｌｍｂｅｒｇｅｒ等人利用体波的理论地震图，由试错拟合，求得北美西海岸及加拿大地盾等区域的上地幔速度剖面，由此确定间断面的深度及间断面上体波速度的变化；Ｙｏｕｎｇ和Ｌａｙ则利用体波的理论地震图研究了不同区域的核幔边界及Ｄ″区域内的速度梯度；而Ｒｅｖｅｎａｕｇｈ和Ｊｏｒｄａｎ利用ＳＨ多次反射波进行反演，研究了西太平洋等区域下的间断面，讨论了４００ｋｍ和６７０ｋｍ间断面的起伏及物理特性。     

Impact of urbanization on hydrological processes under different precipitation scenarios

Natural Hazards - According to analysing the trends of land use changes in the upper reaches of Minjiang River in the past 30 years and precipitation in the last 50 years, nine...     

中国地幔结构及物性研究的进展

对2004——2007年中国地球物理学家在地幔内部结构和物质性质方面的研究工作进行了总结. 对地幔结构的地震波速度成像,地幔介质的各向异性,地幔间断面,地幔对流,以及地幔介质物性进行了综述,指出了各方面的主要内容,使用的主要方法和主要结果. 从这4年的研究可以发现,一些原有的研究领域工作更加深入,方法更加先进,而且进行了广泛的国际合作,合作的范围也逐渐扩大,方式多样,并出现了一些新的研究方向.