...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Physical oceanographic conditions to the northwest of the sub-Antarctic Island of South Georgia
【24h】

Physical oceanographic conditions to the northwest of the sub-Antarctic Island of South Georgia

机译：南乔治亚南部亚南极岛西北部的自然海洋条件

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

Ocean physics is a key aspect of the operation of island ecosystems, yet the hydrodynamics is sometimes poorly understood. A high-resolution oceanographic survey to the north of South Georgia identified two water masses. These are South Georgia Shelf Water (SGSW) and Antarctic Zone Water (AZW). At the surface, SGSW is both colder and fresher than AZW; at the near-surface temperature minimum these differences are reversed. There are two causes: SGSW is close to the island and has an additional contribution to the heat and salt balance from increased precipitation and island runoff, and second, AZW has advected from higher latitudes. Both of these mechanisms imply SGSW is retained around the island. Between these water masses is a variable width frontal region that has a mixture of both water masses. In general terms, the mean current of the AZW is to the west. In the SGSW the general flow also appears to be to the west, but at reduced magnitude; there is evidence of a stronger westerly current close to the shore. In both water masses there are easterly surface currents most likely driven by the prevailing wind. An approximation for the limit of SGSW is that it is constrained to water depths <500 m, A significant deviation is caused by an anticyclonic flow around a prominent bank that can be associated with significant, upwelling. Finally, we comment on the ecological significance of the system observed. [References: 42]
机译：海洋物理学是岛屿生态系统运作的关键方面，但有时人们对水动力学的了解却很少。南乔治亚北部的一项高分辨率海洋学调查确定了两个水团。这些是乔治亚州南部的架子水（SGSW）和南极地带水（AZW）。从表面上看，SGSW比AZW更冷更新鲜。在近地表温度最低时，这些差异将反转。原因有两个：SGSW靠近岛屿，并且由于降水增加和岛屿径流增加而对热量和盐分平衡做出了额外贡献;其次，AZW已从较高的纬度平移。这两种机制都意味着SGSW被保留在岛上。在这些水团之间是具有两个水团的混合物的可变宽度的额叶区域。一般而言，AZW的平均流向西。在SGSW中，总流量似乎也向西，但幅度减小了。有证据表明靠近海岸的西风较强。在这两个水团中，最有可能是由盛行风驱动的东风表面水流。 SGSW极限的近似值是将其限制在水深<500 m内。明显的偏差是由明显堤岸周围的反气旋气流引起的，该气流可能与明显的上升流有关。最后，我们对观察到的系统的生态意义进行评论。 [参考：42]

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