共查询到19条相似文献，搜索用时 843 毫秒
1.
涡旋核心线是海洋中尺度涡旋结构的重要组成要素,涡旋核心线提取和可视化对于切入中尺度涡三维结构研究、开展海洋物质能量垂直运输分析具有重要意义。本文基于客观参考框架和准则,提出了使用客观化的流场参数得到区域,并提取其山谷线作为涡旋核心线的方法,实现了对海洋三维结构中尺度涡旋核心线的提取和可视化。首先,引入了最优局部参考系,使速度、速度梯度等测度转换为在运动的参考系下保持不变的客观量,提升了在海洋科学实践中的可靠性和实用性。其次,针对含有垂向速度的海洋三维流场数据,计算其空间雅可比矩阵,展示了涡旋核心区域的三维结构,实现了海洋涡旋研究从二维到三维的提升。最后,分别在多个半径大小播撒流线种子点,分析不同旋转方向的涡旋,对已提取的涡旋核心线实验结果进行验证,证明了客观海洋三维涡旋核心线提取方法的有效性及可行性。 相似文献
2.
海洋中尺度涡旋可视化可以将海洋中尺度涡旋的运动规律以图形图像等直观的方式加以展现,是研究海洋中尺度涡旋强有力的工具。然而,现有的可视化方法存在一些不足,如时空连续可视化框架中的流线不能表现全时空连续的运动过程,应用到海洋涡旋提取的特征值受阈值影响严重,交互式传输函数依赖用户经验等。为解决已有的不足,本文首次提出了全时空连续框架和传输函数标准形态模式,将基于区域的涡旋提取技术(?准则)应用到海洋中尺度涡旋可视化中,并提出了全时空连续可视化框架二维及三维的GPU实现方案。实验结果表明,本文的可视化方案达到了实时可交互的级别,对于海洋中尺度涡旋交互式可视化具有重要意义。 相似文献
3.
海洋中尺度涡是一种常见的中尺度海洋现象,研究海洋中尺度涡的分布及运动特性对航运、气候、军事等具有重要作用,海洋中尺度涡的识别是海洋学和计算机科学领域的一个热门研究课题。运用深度学习的方法和框架,对中尺度涡的二维识别和三维结构构建展开研究分析。首先,获取全球海洋再分析数据并进行流线可视化,构建涡旋流线数据集;其次,利用YOLO v5s卷积神经网络对涡旋流线数据集进行训练,并对南海区域中尺度涡进行有效检测。实验结果表明,YOLO v5s训练后得到最优模型经过测试,平均检测精度均值达到了86.10%;最后,根据涡旋检测结果,对检测出的同时刻不同深度的涡旋判断是否属于同一涡旋,确定后进行该涡旋的三维结构构建。 相似文献
4.
内尔斯海峡位于加拿大埃尔斯米尔岛与格陵兰岛之间,是北极海冰输出的重要通道之一,这些海冰融化后带来的表层淡水对巴芬湾、拉布拉多海的深层水形成具有重要影响。但由于该海峡较为狭窄,缺乏对此区域海冰运动情况的精细研究。本研究利用每日的哨兵1号影像提取了2016年9月至2017年8月的内尔斯海峡北部区域海冰运动信息,展示了海峡中浮冰的运动过程,并结合风速、海流速度等数据分析浮冰运动特征及影响因素。结果表明风和海流二者共同主导了海冰的运动过程,相关系数分别达到了0.767和0.709,由风速、海流速度、海冰密集度3个自变量与浮冰速度建立的多元线性回归模型复决定系数也达到了0.727。进一步分析发现,风和海流在速度相对稳定时对浮冰速度的影响都会减小。本研究关于风和海流等要素对海冰运动过程影响的研究结果,可以为海洋–大气动力学模型的研究提供参考。 相似文献
5.
6.
7.
渤海海冰漂移数值研究 总被引：1，自引：0，他引：1
本文利用海冰－海洋动力耦合模式对渤海典型天气形势下海冰动力过程作了数值模拟，海冰模式建立在动量和质量守恒基础上，忽略了海冰变化的热力过程。海冰厚度被划分为三类：堆积冰、平整冰和开阔冰，冰的形变由一个厚度的重新分布约束条件确定。海洋模式是一个二维风暴潮模式．同时考虑了潮汐的作用。风场资料来自于沿岸气象观测站每日四次的风观测，计算网格是十分之一经纬度。主要的分析和模拟是在大气和海洋共同作用下海冰的漂流特点。观测结果比较表明，数值模拟结果基本上反映了该海域流冰的漂移性质，同时也可为短期冰情预报提供有益的参考。 相似文献
8.
热带海表温度(SST)模拟偏差是困扰海气耦合模式发展的经典问题之一,其原因仍不完全清晰。针对海气耦合模式CESM1(Community Earth System Model version 1)模拟的热带印度洋SST偏差,我设计了单独大气-陆面模式、单独海洋-海冰模式以及海气耦合模式等一系列数值实验。在此基础上,采用大气-陆面模式和海洋-海冰模式隐式(implicit)SST偏差的分析方法,诊断了CESM1模拟的热带印度洋SST偏差的来源,并分析了大气模式和海洋模式中影响热带印度洋上层海温模拟的主要因素。通过分析热带印度洋不同地区SST的模拟偏差来源,发现耦合模式CESM1中孟加拉湾SST模拟偏冷主要是由海洋-海冰模式中过强的垂直混合、平流作用等海洋动力偏差引起的。在阿拉伯海和赤道西印度洋,过多的潜热释放导致SST降低,大气-陆面模式模拟误差是这两个海域SST冷偏差的主要来源。对于赤道中印度洋,潜热通量偏差和垂直混合、平流作用等模拟误差共同影响上层海水温度,潜热释放偏少、海水垂直混合偏弱以及经向平流向南输送过多暖水使耦合模式模拟的赤道中印度洋SST出现暖偏差,而在赤道东印度洋,模拟的SST偏冷是由大气-陆面模式中短波辐射偏少和海洋-海冰模式中海水垂直混合过强引起的,潜热通量偏差影响较小。分析表明,耦合模式中海气相互作用只影响SST模拟偏差的大小,但不是引起SST偏差的根本原因。 相似文献
9.
青岛-石岛近海反气旋中尺度涡旋存在证据及数值模拟 总被引：3，自引：1，他引：2
系统整理的历史实测海流和温盐资料显示出青岛-石岛近海水域全年都存在着中尺度反气旋式涡旋运动.利用二维数值模式,首次模拟出该涡旋的存在,并对这一涡旋的形成机制进行了探讨,数值模拟结果和实测吻合良好.数值计算表明:在冬季盛行风的作用下,山东半岛南岸出现减水,迫使北上的黄海暖流中的一部分向西北方向延伸,在到达山东半岛近海后向右转向,形成东北向沿岸流,这样,与绕过山东半岛大约沿40～50m等深线南下的黄海沿岸流作用,在青岛-石岛近海形成一个中尺度反气旋涡旋.夏季由于偏南风的作用,致使山东半岛南部近海浅水区域海水都向东北方向流动,与沿黄海冷水团锋面南下的黄海沿岸流相作用,由于流速切变也形成了上述涡旋. 相似文献
10.
系统整理的历史实测海流和温盐资料显示出青岛─石岛近海水域全年都存在着中尺度反气旋式涡旋运动．利用二维数值模式,首次模拟出该涡旋的存在,并对这一涡旋的形成机制进行了探讨,数值模拟结果和实测吻合良好．数值计算表明：在冬季盛行风的作用下,山东半岛南岸出现减水,迫使北上的黄海暖流中的一部分向西北方向延伸,在到达山东半岛近海后向右转向,形成东北向沿岸流,这样,与绕过山东半岛大约沿40～50m等深线南下的黄海沿岸流作用,在青岛─石岛近海形成一个中尺度反气旋涡旋．夏季由于偏南风的作用,致使山东半岛南部近海浅水区域海水都向东北方向流动,与沿黄海冷水团锋面南下的黄海沿岸流相作用,由于流速切变也形成了上述涡旋． 相似文献
11.
《Ocean Modelling》2011,36(4):304-313
We implemented an explicit forcing of the complete lunisolar tides into an ocean model which is part of a coupled atmosphere–hydrology–ocean–sea ice model. An ensemble of experiments with this climate model shows that the model is significantly affected by the induced tidal mixing and nonlinear interactions of tides with low frequency motion. The largest changes occur in the North Atlantic where the ocean current system gets changed on large scales. In particular, the pathway of the North Atlantic Current is modified resulting in improved sea surface temperature fields compared to the non-tidal run. These modifications are accompanied by a more realistic simulation of the convection in the Labrador Sea. The modification of sea surface temperature in the North Atlantic region leads to heat flux changes of up to 50 W/m2. The climate simulations indicate that an improvement of the North Atlantic Current has implications for the simulation of the Western European Climate, with amplified temperature trends between 1950 and 2000, which are closer to the observed trends. 相似文献
12.
A coupled ocean-ice-wave model is used to study ice-edge jet and eddy genesis during surface gravity wave dissipation in a frazil-pancake ice zone. With observational data from the Beaufort Sea, possible wave dissipation processes are evaluated using sensitivity experiments. As wave energy dissipated, energy was transferred into ice floe through radiation stress. Later, energy was in turn transferred into current through ocean-ice interfacial stress. Since most of the wave energy is dissipated at the ice edge, ice-edge jets, which contained strong horizontal shear, appeared both in the ice zone and the ocean. Meanwhile, the wave propagation direction determines the velocity partition in the along-ice-edge and cross-ice-edge directions, which in turn determines the strength of the along-ice-edge jet and cross-ice-edge velocity. The momentum applied in the along-ice-edge(cross-ice-edge)direction increased(decreased) with larger incident angle, which is favorable condition for producing stronger mesoscale eddies, vice versa. The dissipation rate increases(decreases) with larger(smaller) wavenumber, which enhances(reduces) the jet strength and the strength of the mesoscale eddy. The strong along-ice-edge jet may extend to a deep layer(> 200 m). If the water depth is too shallow(e.g., 80 m), the jet may be largely dampened by bottom drag, and no visible mesoscale eddies are found. The results suggest that the bathymetry and incident wavenumber(magnitude and propagation direction) are important for wave-driven current and mesoscale eddy genesis. 相似文献
13.
海洋中尺度涡在本质上是属于满足准地转平衡的大尺度运动,因此理论上,其在短时间内的运动将主要受到准地转平衡关系的约束,而外部强迫场的影响在短期内不会明显改变其运动特征。基于上述思想,我们提出了一种基于四维变分同化初始场的中尺度涡旋预报方案。为了检验该方案的可行性,本文使用区域海洋模式(regional ocean modeling system, ROMS)和其内建的增量强约束四维变分同化(incremental strong constraint four dimensional variational, I4D-Var)模块,建立了一个南海海洋同化模拟系统。首先,通过I4D-Var方法将AVISO卫星高度计资料同化到海洋数值模拟中,获得了理想的中尺度涡同化模拟结果。同化、模式模拟和观测三者的中尺度涡统计结果表明,该同化系统模拟的南海中尺度涡的路径、半径、海表高度异常和振幅等特征信息与AVISO(Archiving ValidationandInterpolationofSatelliteOceanographicData)观测结果高度吻合,同时在深度上的分析表明,涡旋对应的温度、盐度和密度均得到有效的调整。然后,将该同化系统的模拟结果做为初始场,对某一特定时段的南海中尺度涡进行了后报模拟和结果的定量化分析。通过比较后报模拟与观测资料中对应涡旋的海表面高度异常(sea surface height anomalies, SSHA)相关系数、涡心差距和半径绝对误差,证明该方案的中尺度涡后报时效至少可达10 d以上。后报实验结果验证了该中尺度涡预报方案的可行性,从而为中尺度涡的预报提供一定的理论基础和可行性方案。 相似文献
14.
The comprehensive three-dimensional structures of an anti-cyclonic mesoscale eddy(AE) in the subtropical northwestern Pacific Ocean were investigated by combining the Argo floats profiles with enhanced vertical and temporal sampling and satellite altimetry data. The AE originated near the Kuroshio Extension and then propagated westward with mean velocity of 8.9 cm/s. Significant changes and evolutions during the AE's growing stage(T1) and further growing stage(T2) were revealed through composite analysis. In the composite eddy core,maximum temperature(T) and salinity(S) anomalies were of 1.7(1.9)°C and 0.04(0.07) psu in T1(T2) period,respectively. The composite T anomalies showed positive in almost whole depth, but the S anomalies exhibited a sandwich-like pattern. The eddy's intensification and its influence on the intermediate ocean became more significant during its growth. The trapping depth increased from 400×10~4 Pa to 580×10~4 Pa while it was growing up, which means more water volume, heat and salt content in deeper layers can be transported. The AE was strongly nonlinear in upper oceans and can yield a typical mean volume transport of 0.17×10~6 m~3/s and a mean heat and salt transport anomaly of 3.6×10~(11) W and –2.1×10~3 kg/s during the observation period. The Energy analysis showed that eddy potential and kinetic energy increased notably as it propagated westward and the baroclinic instability is the major energy source of the eddy growth. The variation of the remained Argo float trapped within the eddy indicated significant water advection during the eddy's propagation. 相似文献
15.
A.M Davies 《Progress in Oceanography》1985,15(2):71-128
The solution of the linear three dimensional hydrodynamic equations describing wind induced flow in a sea region is developed using the Galerkin method through the vertical. A basis set of B-splines is shown to have some computational advantages over a set of eigenfunctions (vertical modes). However, a basis set of modes leads to a system of essentially uncoupled equations and current profiles can be interpreted in terms of vertical modes.The influence of wind induced surface turbulence and turbulence at depth due to tidal motion upon current profiles in both deep (260 m) and shallow (35 m) sea regions is examined. The variation in the angle between surface current and surface wind for different viscosity profiles, and the effect of bottom friction upon it is considered.The magnitude and direction of the surface current is significantly influenced by surface eddy viscosity. However, viscosity at depth due to tidal motion also has an important effect upon the surface current.The time evolution of current structure following the sudden onset of a wind is examined using the modal model. Calculations show that the rate of damping of the internal modes is inversely proportional to the square of the depth. Consequently wind induced current structure takes longer to reach a steady state in a deep sea region than a shallow area.The influence of sea surface elevation gradients in determining the direction of surface current is also considered. 相似文献
16.
《Ocean Modelling》2002,4(2):137-172
A new sea ice model, GELATO, was developed at Centre National de Recherches Météorologiques (CNRM) and coupled with OPA global ocean model. The sea ice model includes elastic–viscous–plastic rheology, redistribution of ice floes of different thicknesses, and it also takes into account leads, snow cover and snow ice formation. Climatologies of atmospheric surface parameters are used to perform a 20-year global ocean–sea ice simulation, in order to compute surface heat fluxes from diagnosed sea ice or ocean surface temperature. A surface salinity restoring term is applied only to ocean grid cells with no sea ice to avoid significant surface salinity drifts, but no correction of sea surface temperature is introduced. In the Arctic the use of an ocean model substantially improves the representation of sea ice, and particularly of the ice edge in all seasons, as advection of heat and salt can be more accurately accounted for than in the case of, for example, a sea ice–ocean mixed layer model. In contrast, in the Antarctic, a region where ocean convective processes bear a much stronger influence in shaping sea ice characteristics, a better representation of convection and probably of sea ice (for example, of frazil sea ice, brine rejection) would be needed to improve the simulation of the annual cycle of the sea ice cover. The effect of the inclusion of several ice categories in the sea ice model is assessed by running a sensitivity experiment in which only one category of sea ice is considered, along with leads. In the Arctic, such an experiment clearly shows that a multicategory sea ice model better captures the position of the sea ice edge and yields much more realistic sea ice concentrations in most of the region, which is in agreement with results from Bitz et al. [J. Geophys. Res. 106 (C2) (2001) 2441–2463]. 相似文献
17.
LIAO Guanghong YANG Chenghao XU Xiaohu SHI Xingang YUAN Yaochu HUANG Weigen 《海洋学报(英文版)》2012,31(5):26-40
The mesoscale eddy and internal wave both are phenomena commonly observed in oceans. It is aimed to investigate how the presence of a mesoscale eddy in the ocean affects wave form deformation of the internal solitary wave propagation. An ocean eddy is produced by a quasi-geostrophic model in f-plane, and the one-dimensional nonlinear variable-coefficient extended Korteweg-de Vries (eKdV) equation is used to simulate an internal solitary wave passing through the mesoscale eddy field. The results suggest that the mode structures of the linear internal wave are modified due to the presence of the mesoscale eddy field. A cyclonic eddy and an anticyclonic eddy have different influences on the background environment of the internal solitary wave propagation. The existence of a mesoscale eddy field has almost no prominent impact on the propagation of a smallamplitude internal solitary wave only based on the first mode vertical structure, but the mesoscale eddy background field exerts a considerable influence on the solitary wave propagation if considering high-mode vertical structures. Furthermore, whether an internal solitary wave first passes through anticyclonic eddy or cyclonic eddy, the deformation of wave profiles is different. Many observations of solitary internal waves in the real oceans suggest the formation of the waves. Apart from topography effect, it is shown that the mesoscale eddy background field is also a considerable factor which influences the internal solitary wave propagation and deformation. 相似文献
18.
The sensitivity of the North Atlantic gyre circulation to high latitude buoyancy forcing is explored in a global, non-eddy resolving ocean general circulation model. Increased buoyancy forcing strengthens the deep western boundary current, the northern recirculation gyre, and the North Atlantic Current, which leads to a more realistic Gulf Stream path. High latitude density fluxes and surface water mass transformation are strongly dependent on the choice of sea ice and salinity restoring boundary conditions. Coupling the ocean model to a prognostic sea ice model results in much greater buoyancy loss in the Labrador Sea compared to simulations in which the ocean is forced by prescribed sea ice boundary conditions. A comparison of bulk flux forced hindcast simulations which differ only in their sea ice and salinity restoring forcings reveals the effects of a mixed thermohaline boundary condition transport feedback whereby small, positive temperature and salinity anomalies in subpolar regions are amplified when the gyre spins up as a result of increased buoyancy loss and convection. The primary buoyancy flux effects of the sea ice which cause the simulations to diverge are ice melt, which is less physical in the diagnostic sea ice model, and insulation of the ocean, which is less physical with the prognostic sea ice model. Increased salinity restoring ensures a more realistic net winter buoyancy loss in the Labrador Sea, but it is found that improvements in the Gulf Stream simulation can only be achieved with the excessive buoyancy loss associated with weak salinity restoring. 相似文献