Float Observations of the Southern Ocean. Part I: Estimating Mean Fields, Bottom Velocities, and Topographic Steering
Float Observations of the Southern Ocean. Part I: Estimating Mean Fields, Bottom Velocities, and Topographic Steering
复制标题
南大洋的浮标观测。
DOI：
10.1175/1520-0485(2003)033
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发表时间：
2003
影响因子：
3.5
通讯作者：
S. Gille
中科院分区：
文献类型：
--
作者：
S. Gille
摘要利用自主拉格朗日环流探测器（ALACE）浮标探测南大洋900米深度的平均流和涡动通量。从浮子数据的平均温度和动态地形是一致的，从水文调查早期的估计，虽然浮子意味着温暖的温度和狭窄的锋面结构比地图集数据。水文地形和ALACE动力地形之间的差异表明，在南极绕极流向东流动的急流下方存在着约2 cm s−1的向东的海底速度。流量由测深仪控制，可以表示为等效正压系统，e-折叠深度约为700 m。
Abstract Autonomous Lagrangian Circulation Explorer (ALACE) floats are used to examine mean flow and eddy fluxes at 900-m depth in the Southern Ocean. Mean temperature and dynamic topography from float data are consistent with earlier estimates from hydrographic surveys, although floats imply warmer temperatures and narrower frontal structures than do atlas data. Differences between hydrographic and ALACE dynamic topography suggest the presence of eastward bottom velocities of about 2 cm s−1 below the eastward-flowing jets of the Antarctic Circumpolar Current. Flow is steered by bathymetry and can be represented as an equivalent barotropic system with an e-folding depth of about 700 m.