Annual variation of the southern boundary current in the Banda Sea

ADCP measurements in the southern Banda Sea, obtained with the bulk carrier “MS First Jupiter” from 1997 until 2000, have been analysed. The observations reveal the presence of an eastward flowing southern boundary current, bringing water from the Indonesian throughflow towards the connections with the Indian Ocean in Ombai Strait and the Timor Sea. The mean transport in the upper 300 m is estimated to be about 5 Sv, over 50% of the outflow towards the Indian Ocean in this layer through the eastern passages near Timor. The velocity in the boundary current shows a clear annual variation, more or less in phase with the annually varying inflow through Makassar Strait and the outflow near Timor. The phase of the annual variation cannot be explained by the monsoonal variation of the local winds. Therefore this annual variation of the throughflow is probably generated by large-scale forcing. A considerable reduction of the strength of the boundary current was observed in 1998, following the 1997–1998 El Niño with a delay of about half a year. On shorter time scales, Kelvin waves, entering the Banda Sea from the Indian Ocean, cause flow reversals of the boundary current.     

Influence of micrometeorological features on coastal boundary layer aerosol characteristics at the tropical station, Trivandrum

Characteristics of aerosols in the Atmospheric Boundary Layer (ABL) obtained from a bistatic CW lidar at Trivandrum for the last one decade are used to investigate the role of ABL micro-meteorological processes in controlling the altitude distribution and size spectrum. The altitude structure of number density shows three distinct zones depending on the prevailing boundary layer feature; viz, the well-mixed region, entertainment region and upper mixing region. In the lower altitudes vertical mixing is very strong (the well-mixed region) the upper limit of which is defined as aerosol-mixing height, is closely associated with the low level inversion. The aerosol mixing height generally lies in the range 150 to 400 m showing a strong dependence on the vertical eddy mixing processes in ABL. Above this altitude, the number density decreases almost exponentially with increase in altitude with a scale height of 0.5–1.5 km. The aerosol mixing height is closely associated with the height of the Thermal Internal Boundary Layer (TIBL). Sea-spray aerosols generated as a result of the interaction of surface wind with sea surface forms an important component of mixing region aerosols at this location. This component shows a non-linear dependence on wind speed. On an average, depending on the season, the mixing region contributes about 10–30% of the columnar aerosol optical depth (AOD) at 0.5Μm wavelength. A long term increasing trend (∼ 2.8% per year) is observed in mixing region AOD from 1989 to 1997. A study on the development of the aerosols in the nocturnal mixing region shows that the convectively driven daytime altitude structure continues to persist for about 4–5 hrs. after the sunset and thereafter the altitude structure is governed by vertical structure of horizontal wind. Stratified aerosol layers associated with stratified turbulence is very common during the late night hours.     

三维介质界面裂纹的动力分析

本文通过区域的连续映射推导了一种映射半解析边界元法，将其应用于界面裂纹问题的动力分析，可大大减小计算一。典型算例的结构表明，本文方法是非常有效的，并可推广应用于三维复杂形状裂纹的计算问题。     

Auto CAD技术在市政工程系列图成图上的应用

本文通过对ＡｕｔｏＣＡＤ技术的二次开发，实现了市政工程系列图图形的直观显示、编码管理、快速成图等功能。     

地幔对流环型场的激发(Ⅰ)

讨论了地幔内部的粘滞度及施加在地表和CMB 的边界条件对地幔对流环型场的激发分析表明,当粘滞度侧向均匀时,环型场与极型场自然解耦,且环型场不影响重力位,当粘滞度侧向不均时,环型场与极型场耦合在一起.两者共同影响重力位.当引入板块运动速度时,边界条件非零,也能激发环型场;对侧向均匀粘滞度地幔,零边界条件不能激发环型场     

凝结潜热对锋生的影响

本文在二维半地转峰生模式中，考虑了水汽凝结加热和边界层抽吸作用对锋生及越锋环流的影响。水汽凝结加热考虑了大尺度凝结加热和对流凝结加热两种方式。计算结果表明：水汽凝结加热和边界层抽吸对峰区环流具有显著的作用，凝结加热使锋生加快，使锋区上升运动倍增，并使其水平尺度明显减少。边界层抽吸作用也使垂直环流加强。现在     

Study on the Thermal internal Boundary Layer and Dispersion of Air Pollutant

ＳｔｕｄｙｏｎｔｈｅＴｈｅｒｍａｌｉｎｔｅｒｎａｌＢｏｕｎｄａｒｙＬａｙｅｒａｎｄＤｉｓｐｅｒｓｉｏｎｏｆＡｉｒＰｏｌｌｕｔａｎｔｉｎＣｏａｓｔａｌＡｒｅａｂｙＮｕｍｅｒｉｃａｌＳｉｍｕｌａｔｉｏｎ￥ＪｉａｎｇＷｅｉｍｅｉ（蒋维楣）ａｎｄＹｕＨｏｎｇ...     

弹性波边界元法正演模拟

弹性波边界元地震模型方法（ＢＥＥＳＭ），实现了二维和三维问题的纵、横波及转换波的同时模拟，并且能模拟任意复杂构造的地震声波正演模型．根据地震模型的特点，本文发展了数值积分计算与矩阵消元同步进行的块状高斯消元法；用解析法处理奇异积分；用无限元法处理边界吸收问题；采用单元长度随介质速度和计算频率变化的变单元算法，及自动剖分单元等技术，提高了计算精度，节省了内存，缩短了计算时间．     

我国对越南直接投资初探

本文从理论和实际的结合上，论述了我国开展对越直接投资的必要性和可能性。文中对投资机遇、边境贸易、对越经援等问题作了深入分析，并提出了对越投资的产业导向和区域战略。     

Microfossils from the Chert in the Lower Cambrian Shuijingtuo Formation at Miaohe,Zigui, Hubei Province1

Abstract This paper reports for the first time on the microfossils discovered in the black cherts of the basal part of the Lower Cambrian Shuijingtuo Formation at Miaohe village, Zigui County, Hubei Province, all of which were observed in thin sections. Nine genera, 9 species and 3 indeterminate species (including a new species) are described. According to these microfossils, the conclusion is made that the microfossil zone may be equivalent to the small shelly fossil assemblage zones 2-3 of the Meishucun stage. They have provided another important line of evidence for the correlation of the Sinian-Cambrian boundary strata with those of the adjacent areas.