提要采用多种资料研究南大洋南极绕极流(Antarctic Circumpolar Current,ACC)区中尺度涡的年际变化规律及机制。通过分析网格化融合卫星海洋资料AVISO(Archiving,Validation and Interpretation of Satellites Oceanographic DATA-AVISO...提要采用多种资料研究南大洋南极绕极流(Antarctic Circumpolar Current,ACC)区中尺度涡的年际变化规律及机制。通过分析网格化融合卫星海洋资料AVISO(Archiving,Validation and Interpretation of Satellites Oceanographic DATA-AVISO)卫星高度计资料发现,ACC区涡动能(Eddy Kinetic Energy,EKE)的季节变化不明显,但年际变化非常显著。对纬向风应力与年际南半球环状模(Southern Annular Mode,SAM)异常事件的分析表明,纬向风应力极大/极小值超前EKE极大/极小值3年左右出现,EKE对风应力延时响应的时间及强度依赖于风应力异常的强度。此外,还采用海洋环流与气候评估协会(Estimating the Circulation and Climate of the Ocean,ECCO)温盐数据,计算了南极绕极流区斜压能量转化率的分布,并基于此来分析年际尺度上风场、背景海洋间的能量传递关系。研究认为:ACC区中尺度涡的年际变化是由于年际南半球环状模相关的风应力变化引起ACC流量变化以及ACC相关洋域的等密面倾斜程度发生改变,导致背景海洋向中尺度涡的斜压能量转换改变,造成中尺度涡的活动产生年际调整。展开更多
A coupled sea ice-mixed layer-isopycnal model (OPYC, alias PIPE) was applied to simulate the circulation in the Southern Ocean. The model domain covered the Southern Ocean south of 24°S. The model was first spun ...A coupled sea ice-mixed layer-isopycnal model (OPYC, alias PIPE) was applied to simulate the circulation in the Southern Ocean. The model domain covered the Southern Ocean south of 24°S. The model was first spun up in a coarse resolution grid (2° longitude×1°latitude) for 40 years running; then was shifted into a fine resolution grid (1°longitude×0.5°latitude with a focus in the Indian Sector and the Antarctic Marginal Sea) for additional 5 years running in order to creat the detailed circulation pattern in the area of interest. The simulated annual averaged volume transport through Drake Passage was 145.3×106m 3/s and more similar to the observed result (134×106m 3/s) than FRAM’s result (about 200×106m 3/s). The simulated results of circulation and sea ice also agreed with those of previous results. The meridional streamfuction and meridional transport obtained from the simulated results were used to study the meridional characteristics of the Antarctic Circumpolar Current(ACC). The ACC is traditionally considered to be a zonal current. However, the modeled result showed the ACC’s significant non-zonal feature in some regions, such as the Kerguelen Plateau in the Indian Sector. Arranged in a staggered way, the northward and southward transport areas occur in the ACC region. The isopycnals go up in the northward transport areas and go down in the southward transport areas, which implied a spiral motion of fluid particles in the ACC. This spiral motion is caused by the non-zonal feature of the ACC and is constructed by the ACC’s north and south shifts in several regions of the Southern Ocean not only the Drake Passage. Though most meridional motions are limited in the ACC region, some meridional exchange channels across the ACC might exist in some areas, for example, in the Southeast Australian Basin near 150°E. The meridional streamfuction shows the Subtropical Cell, the Deacon Cell, the Subpolar Cell and the Polar Cell, but misses the Deep Cell. All the cells change with seasons. The Deacon Cell and the Subpolar Cell connect with each other in summer but are separate in the other three seasons. Their ranges are smaller in summer and larger in winter. In contrast, the Polar Cell’s range covers a quite large region between the Antarctic coast and 64°S in summer but becomes smaller in winter, which implies that the Polar Cell is related to the sea ice’s melt process.展开更多
使用中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室(LASG/IAP)开发的第三代气候海洋模式(LASG/IAP Climate system Ocean Model version 3,LICOM3.0)低分辨率版本在海洋模式比较计划(Ocean Model Intercompari...使用中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室(LASG/IAP)开发的第三代气候海洋模式(LASG/IAP Climate system Ocean Model version 3,LICOM3.0)低分辨率版本在海洋模式比较计划(Ocean Model Intercomparison Project,OMIP)试验中的模拟数据,描述了南极绕极流(Antarctic Circumpolar Current,ACC)和南大洋经向翻转环流(Meridional Overturning Circulation,MOC)在1958-2009年的平均状态及其变化,并与已有的模式模拟结果和观测结果对比以评估LICOM模式的模拟效果.通过对比已有模式模拟数据发现,LICOM3.0模式模拟的ACC和南大洋MOC在两组OMIP试验中平均状态相仿、结果在合理范围内,但OMIP1试验中海表强迫的变化趋势较OMIP2试验中的变化更大,得到的环流输送在OMIP1试验中增长趋势也更大.展开更多
文摘提要采用多种资料研究南大洋南极绕极流(Antarctic Circumpolar Current,ACC)区中尺度涡的年际变化规律及机制。通过分析网格化融合卫星海洋资料AVISO(Archiving,Validation and Interpretation of Satellites Oceanographic DATA-AVISO)卫星高度计资料发现,ACC区涡动能(Eddy Kinetic Energy,EKE)的季节变化不明显,但年际变化非常显著。对纬向风应力与年际南半球环状模(Southern Annular Mode,SAM)异常事件的分析表明,纬向风应力极大/极小值超前EKE极大/极小值3年左右出现,EKE对风应力延时响应的时间及强度依赖于风应力异常的强度。此外,还采用海洋环流与气候评估协会(Estimating the Circulation and Climate of the Ocean,ECCO)温盐数据,计算了南极绕极流区斜压能量转化率的分布,并基于此来分析年际尺度上风场、背景海洋间的能量传递关系。研究认为:ACC区中尺度涡的年际变化是由于年际南半球环状模相关的风应力变化引起ACC流量变化以及ACC相关洋域的等密面倾斜程度发生改变,导致背景海洋向中尺度涡的斜压能量转换改变,造成中尺度涡的活动产生年际调整。
文摘A coupled sea ice-mixed layer-isopycnal model (OPYC, alias PIPE) was applied to simulate the circulation in the Southern Ocean. The model domain covered the Southern Ocean south of 24°S. The model was first spun up in a coarse resolution grid (2° longitude×1°latitude) for 40 years running; then was shifted into a fine resolution grid (1°longitude×0.5°latitude with a focus in the Indian Sector and the Antarctic Marginal Sea) for additional 5 years running in order to creat the detailed circulation pattern in the area of interest. The simulated annual averaged volume transport through Drake Passage was 145.3×106m 3/s and more similar to the observed result (134×106m 3/s) than FRAM’s result (about 200×106m 3/s). The simulated results of circulation and sea ice also agreed with those of previous results. The meridional streamfuction and meridional transport obtained from the simulated results were used to study the meridional characteristics of the Antarctic Circumpolar Current(ACC). The ACC is traditionally considered to be a zonal current. However, the modeled result showed the ACC’s significant non-zonal feature in some regions, such as the Kerguelen Plateau in the Indian Sector. Arranged in a staggered way, the northward and southward transport areas occur in the ACC region. The isopycnals go up in the northward transport areas and go down in the southward transport areas, which implied a spiral motion of fluid particles in the ACC. This spiral motion is caused by the non-zonal feature of the ACC and is constructed by the ACC’s north and south shifts in several regions of the Southern Ocean not only the Drake Passage. Though most meridional motions are limited in the ACC region, some meridional exchange channels across the ACC might exist in some areas, for example, in the Southeast Australian Basin near 150°E. The meridional streamfuction shows the Subtropical Cell, the Deacon Cell, the Subpolar Cell and the Polar Cell, but misses the Deep Cell. All the cells change with seasons. The Deacon Cell and the Subpolar Cell connect with each other in summer but are separate in the other three seasons. Their ranges are smaller in summer and larger in winter. In contrast, the Polar Cell’s range covers a quite large region between the Antarctic coast and 64°S in summer but becomes smaller in winter, which implies that the Polar Cell is related to the sea ice’s melt process.
文摘使用中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室(LASG/IAP)开发的第三代气候海洋模式(LASG/IAP Climate system Ocean Model version 3,LICOM3.0)低分辨率版本在海洋模式比较计划(Ocean Model Intercomparison Project,OMIP)试验中的模拟数据,描述了南极绕极流(Antarctic Circumpolar Current,ACC)和南大洋经向翻转环流(Meridional Overturning Circulation,MOC)在1958-2009年的平均状态及其变化,并与已有的模式模拟结果和观测结果对比以评估LICOM模式的模拟效果.通过对比已有模式模拟数据发现,LICOM3.0模式模拟的ACC和南大洋MOC在两组OMIP试验中平均状态相仿、结果在合理范围内,但OMIP1试验中海表强迫的变化趋势较OMIP2试验中的变化更大,得到的环流输送在OMIP1试验中增长趋势也更大.
