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Journal of Oceanology and Limnology - Multi-year Simple Ocean Data Assimilation (SODA) and National Centers for Environmental Prediction (NCEP) datasets were used to investigate the leading... 相似文献
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为了研究正断层在油气成藏与分布中的作用,通过分析正断层输导与不同运移方向所形成的油气分布之间关系,对正断层输导油气运移输导模式及其对油气分布的控制作用进行了研究,结果表明：正断层输导油气运移模式主要有输导油气垂向运移和输导油气侧向运移2种模式。正断层输导油气垂向运移模式又可分为输导油气以垂向运移为主模式和输导油气先垂后侧运移模式;正断层输导油气侧向运移模式又可分为输导油气侧向连接运移模式和输导油气先侧后垂运移模式。正断层输导油气垂向运移模式对油气分布的控制作用主要表现在2个方面：①正断层输导油气垂向运移模式控制着油气剖面分布特征,输导油气以垂向运移为主模式形成的油气可以在盖层上下分布,输导油气先垂后侧运移模式形成的油气只能在盖层之下分布。②正断层上盘高砂地比地层是其垂向输导油气运移模式形成油气平面分布的主要部位。正断层输导油气侧向运移模式对油气分布的控制作用主要表现在2个方面：①正断层输导油气侧向运移模式控制着油气剖面分布特征,输导油气先侧后垂运移模式形成的油气可以在盖层上下分布,输导油气侧向连接运移模式形成的油气只能在盖层之下分布。②反向正断层下盘是其侧向输导运移模式形成油气平面分布的主要部位。 相似文献
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The low-frequency atmosphere-ocean coupled variability of the southern Indian Ocean(SIO) was investigated using observation data over 1958-2010.These data were obtained from ECMWF for sea level pressure(SLP) and wind,from NCEP/NCAR for heat fluxes,and from the Hadley Center for SST.To obtain the coupled air-sea variability,we performed SVD analyses on SST and SLP.The primary coupled mode represents 43% of the total square covariance and is featured by weak westerly winds along 45-30 S.This weakened subtropical anticyclone forces fluctuations in a well-known subtropical dipole structure in the SST via wind-induced processes.The SST changes in response to atmosphere forcing and is predictable with a lead-time of 1-2 months.Atmosphere-ocean coupling of this mode is strongest during the austral summer.Its principle component is characterized by mixed interannual and interdecadal fluctuations.There is a strong relationship between the first mode and Antarctic Oscillation(AAO).The AAO can influence the coupled processes in the SIO by modulating the subtropical high.The second mode,accounting for 30% of the total square covariance,represents a 25-year period interdecadal oscillation in the strength of the subtropical anticyclone that is accompanied by fluctuations of a monopole structure in the SST along the 35-25 S band.It is caused by subsidence of the atmosphere.The present study also shows that physical processes of both local thermodynamic and ocean circulation in the SIO have a crucial role in the formation of the atmosphere-ocean covariability. 相似文献
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Journal of Oceanology and Limnology - Traditionally, the estimated volume transport of the North Equatorial Current/Undercurrent (NEC/NEUC) is based on geostrophic equations and/or model results;... 相似文献
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复杂三维建筑物模型由于其具有建筑构件及其结构关系的详尽几何描述,将越来越多的出现在各类精细化虚拟地理环境应用中.但是,当前图形硬件处理能力的增长仍远落后于激增的三维数据规模,从而导致该类模型难以被高效地绘制.并且,模型中错综复杂的构件关系妨碍了用户对其结构的快速认知.因此,急需对该类模型自动化地建立多个细节层次(level of detail,LOD)的三维模型.由于已有模型自动简化方法对复杂三维建筑物模型存在保真性与合理性方面的严重不足,复杂建筑物模型的简化需要大量人工干预,代价大且易产生人为错误,已成为复杂三维建筑物模型广泛应用的重要瓶颈.如何针对模型不同的复杂性,定量优化LOD模型的细节水平,自适应的保留重要特征并减少不必要的冗余,以符合人对其认知过程的层次性,是计算机图形学与虚拟地理环境领域亟待解决的前沿难点问题. 相似文献
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Hu Shijian Hu Dunxin Guan Cong Xing Nan Li Jianping Feng Junqiao 《Climate Dynamics》2017,49(7-8):2431-2449
Climate Dynamics - Sea surface temperature (SST) structure inside the western Pacific warm pool (WPWP) is usually overlooked because of its distinct homogeneity, but in fact it possesses a clear... 相似文献
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We investigated the intraseasonal variability of equatorial Pacific subsurface temperature and its relationship with El Nino-Southern Oscillation(ENSO) using Self-Organizing Maps(SOM) analysis.Variation in intraseasonal subsurface temperature is mainly found along the thermocline.The SOM patterns concentrate in basin-wide seesaw or sandwich structures along an east-west axis.Both the seesaw and sandwich SOM patterns oscillate with periods of 55 to 90 days,with the sequence of them showing features of equatorial intraseasonal Kelvin wave,and have marked interannual variations in their occurrence frequencies.Further examination shows that the interannual variability of the SOM patterns is closely related to ENSO;and maxima in composite interannual variability of the SOM patterns are located in the central Pacific during CP El Nino and in the eastern Pacific during EP El Nino.The se results imply that some of the ENSO forcing is manife sted through changes in the occurrence frequency of intraseasonal patterns,in which the change of the intraseasonal Kelvin wave plays an important role. 相似文献
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We investigate the influence of low-frequency Rossby waves on the thermal structure of the upper southwestern tropical Indian
Ocean (SWTIO) using Argo profiles, satellite altimetric data, sea surface temperature, wind field data and the theory of linear
vertical normal mode decomposition. Our results show that the SWTIO is generally dominated by the first baroclinic mode motion.
As strong downwelling Rossby waves reach the SWTIO, the contribution of the second baroclinic mode motion in this region can
be increased mainly because of the reduction in the vertical stratification of the upper layer above thermocline, and the
enhancement in the vertical stratification of the lower layer under thermocline also contributes to it. The vertical displacement
of each isothermal is enlarged and the thermal structure of the upper level is modulated, which is indicative of strong vertical
mixing. However, the cold Rossby waves increase the vertical stratification of the upper level, restricting the variability
related to the second baroclinic mode. On the other hand, during decaying phase of warm Rossby waves, Ekman upwelling and
advection processes associated with the surface cyclonic wind circulation can restrain the downwelling processes, carrying
the relatively colder water to the near-surface, which results in an out-of-phase phenomenon between sea surface temperature
anomaly (SSTA) and sea surface height anomaly (SSHA) in the SWTIO. 相似文献