Kelvin模型应用于福建水口库区斜溪形变场地沉浮分析

沿斜溪场地乡村公路布设4个水准测点,其中2个点高差在1997~2015年趋势下降,之后趋势上升。研究斜溪断裂性质认为,断层上盘在2015年前后由下沉转为上浮,经异常核实为机砖厂影响所致。为解释场地沉浮现象,采用粘弹性介质模型,利用跨断层短水准观测资料和最小二乘方法计算介质的延滞时间为32个月。     

On the Response of Subduction in the South Pacific to an Intensification of Westerlies and Heat Flux in an Eddy Permitting Ocean Model

Based on an eddy permitting ocean general circulation model, the response of water masses to two distinct climate scenarios in the South Pacific is assessed in this paper. Under annually repeating atmospheric forcing that is characterized by different westerlies and associated heat flux, the response of Subantarctic Mode Water(SAMW) and Antarctic Intermediate Water(AAIW) is quantitatively estimated. Both SAMW and AAIW are found to be warmer, saltier and denser under intensified westerlies and increased heat loss. The increase in the subduction volume of SAMW and AAIW is about 19.8 Sv(1 Sv =10~6m~3s~(-1)). The lateral induction term plays a dominant role in the changes in the subduction volume due to the deepening of the mixed layer depth(MLD). Furthermore, analysis of the buoyancy budget is used to quantitatively diagnose the reason for the changes in the MLD. The deepening of the MLD is found to be primarily caused by the strengthening of heat loss from the ocean to the atmosphere in the formation region of SAMW and AAIW.     

Impacts of a wind stress and a buoyancy flux on the seasonal variation of mixing layer depth in the South China Sea

The seasonal variation of mixing layer depth(MLD) in the ocean is determined by a wind stress and a buoyance flux.A South China Sea(SCS) ocean data assimilation system is used to analyze the seasonal cycle of its MLD.It is found that the variability of MLD in the SCS is shallow in summer and deep in winter,as is the case in general.Owing to local atmosphere forcing and ocean dynamics,the seasonal variability shows a regional characteristic in the SCS.In the northern SCS,the MLD is shallow in summer and deep in winter,affected coherently by the wind stress and the buoyance flux.The variation of MLD in the west is close to that in the central SCS,influenced by the advection of strong western boundary currents.The eastern SCS presents an annual cycle,which is deep in summer and shallow in winter,primarily impacted by a heat flux on the air-sea interface.So regional characteristic needs to be cared in the analysis about the MLD of SCS.     

6 000米AUV深海试验研究

简要介绍6000米AUV的总体结构和主要功能,重点研究AUV深海试验中的无动力下潜试验和载体浮力测量试验,提出三种深海浮力测量方法。根据试验数据,通过调整载体配重,在控制特性不变的情况下,使AUV在水下航行达到能量最优。此方法是一种理论和工程实际相结合的方法,对于其它类型深水AUV试验具有指导意义。