...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Physical Oceanography >The Shallow and Deep Western Boundary Circulation of the South Atlantic at 5°-11°S
【24h】

The Shallow and Deep Western Boundary Circulation of the South Atlantic at 5°-11°S

机译：5°-11°S处南大西洋的浅层和深层西部边界环流

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Repeated shipboard observation sections across the boundary flow off northeastern Brazil as well as acoustic Doppler current profiler (ADCP) and current-meter records from a moored boundary array deployed during 2000-04 near 11°S are analyzed here for both the northward warm water flow by the North Brazil Undercurrent (NBUC) above approximately 1100 m and the southward flow of North Atlantic Deep Water (NADW) underneath. At 5°S, the mean from nine sections yields an NBUC transport of 26.5 ± 3.7 Sv (Sv = 10~6 m~3 s~(-1)) along the boundary; at 11°S the mean NBUC transport from five sections is 25.4 ± 7.4 Sv, confirming that the NBUC is already well developed at 11°S. At both latitudes a persistent offshore southward recirculation between 200- and 1100-m depth reduces the net northward warm water flow through the 5°S section (west of 31.5°W) to 22.1 ± 5.3 Sv and through the 11°S section to 21.7 ± 4.1 Sv (west of 32.0°W). The 4-yr-long NBUC transport time series from 11°S yields a seasonal cycle of 2.5 Sv amplitude with its northward maximum in July. Interannual NBUC transport variations are small, varying only by ±1.2 Sv during the four years, with no detectable trend. The southward flow of NADW within the deep western boundary current at 5°S is 25.5 ± 8.3 Sv with an offshore northward recirculation, yielding a nine-section mean of 20.3 ± 10.1 Sv west of 31.5°W. For Antarctic Bottom Water, a net northward flow of 4.4 ± 3.0 Sv is determined at 5°S. For the 11°S section, the moored array data show a pronounced energy maximum at 60-70-day period in the NADW depth range, which was identified in related work as deep eddies translating southward along the boundary. Based on a kinematic eddy model fit to the first half of the moored time series, the mean NADW transfer by the deep eddies at 11°S was estimated to be about 17 Sv. Given the large interannual variability of the deep near-boundary transport time series, which ranged from 14 to 24 Sv, the 11°S mean was considered to be not distinguishable from the mean at 5°S.
机译：在这里分析了巴西东北部边界流的重复舰船观测部分，以及在2000-04年11月附近部署的系泊边界阵列的声学多普勒电流剖面仪（ADCP）和电流计记录，以了解北向暖水流大约1100 m以上的北巴西暗流（NBUC）以及下方的北大西洋深水（NADW）的南流。在5°S时，九个剖面的平均值沿边界产生26.5±3.7 Sv的NBUC传输（Sv = 10〜6 m〜3 s〜（-1））。在11°S时，来自五个断面的NBUC平均运移速度为25.4±7.4 Sv，这证明NBUC在11°S时已经发育良好。在两个纬度上，深度在200至1100米之间的持续的向南海上回流将通过5°S段（31.5°W以西）和11°S段的北向净热水净流量降低至22.1±5.3 Sv。 ±4.1 Sv（32.0°W以西）。从11°S开始的长达4年的NBUC运输时间序列产生了一个2.5 Sv振幅的季节性周期，其最大的北移时间是7月。年度NBUC传输变化很小，在四年中仅变化±1.2 Sv，没有可检测的趋势。在5°S的深西部边界流内，NADW的南流为25.5±8.3 Sv，并伴有向北的海上回流，在31.5°W以西的九个剖面平均值为20.3±10.1 Sv。对于南极底水，在5°S时确定的净北向流量为4.4±3.0 Sv。对于11°S断面，系泊的阵列数据显示在NADW深度范围内60-70天期间有明显的能量最大值，这在相关工作中被确认为深涡流沿边界向南平移。根据适合于系泊时间序列前半部分的运动涡模型，估计深涡在11°S的平均NADW传递约为17 Sv。鉴于深层近边界运输时间序列的年际变化较大，范围在14至24 Sv之间，因此认为11°S的平均值与5°S的平均值没有区别。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号