Improving Estimates of the Antarctic Circumpolar Current Streamlines in Drake Passage
Improving Estimates of the Antarctic Circumpolar Current Streamlines in Drake Passage
复制标题
改进对德雷克海峡南极绕极流流线的估计
DOI：
10.1175/2007jpo3834.1
复制
发表时间：
2008
影响因子：
3.5
通讯作者：
J. Sprintall
中科院分区：
文献类型：
--
作者：
Y. Lenn;T. Chereskin;J. Sprintall
摘要准确分辨南极绕极流对于确定对全球经向翻转环流具有重要意义的南大洋涡旋通量是至关重要的。由于缺乏对南大洋的观测，以前对Acc平均值的估计受到限制。结合卫星测高测量的海面高度异常和高分辨率声学多普勒海流剖面仪的最新观测资料，提出了一种新的德雷克航道平均海面AC值的估算方法。由平均流客观绘制的平均流函数(地面高度场)被用来验证最近的两个动态高度气候。新的流函数有更窄和更强的ACC锋面，被更弱的气流的静止区隔开，从而提高了在其他气候学中观察到的ACC锋面的分辨率。不同的流线可以与特定的ACC锋面相关联，并在动态高度的随时间变化的地图中跟踪。这项分析..。
Abstract Accurately resolving the mean Antarctic Circumpolar Current (ACC) is essential for determining Southern Ocean eddy fluxes that are important to the global meridional overturning circulation. Previous estimates of the mean ACC have been limited by the paucity of Southern Ocean observations. A new estimate of the mean surface ACC in Drake Passage is presented that combines sea surface height anomalies measured by satellite altimetry with a recent dataset of repeat high-resolution acoustic Doppler current profiler observations. A mean streamfunction (surface height field), objectively mapped from the mean currents, is used to validate two recent dynamic height climatologies. The new streamfunction has narrower and stronger ACC fronts separated by quiescent zones of much weaker flow, thereby improving on the resolution of ACC fronts observed in the other climatologies. Distinct streamlines can be associated with particular ACC fronts and tracked in time-dependent maps of dynamic height. This analysis...