...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Physical Oceanography >Interdecadal Dynamics of the North Pacific Ocean
【24h】

Interdecadal Dynamics of the North Pacific Ocean

机译：北太平洋年代际动力学

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

An isopycnal ocean model forced by NCEP-NCAR reanalysis wind stresses and heat fluxes is used to study the interdecadal variability of the Pacific Ocean in the 1958―97 period. A reasonable agreement is found between the model's modes of variability and those obtained by other researchers from both 100 years of observations and theoretical predictions. In agreement with previous observational work, decadal and interdecadal timescales have different descriptions, and from this study it is suggested that they indeed have different dynamics. This study focuses on the dynamics of the ocean's interdecadal variability, that is, of timescales of about 20 yr. The decadal timescale, that is, 10 yr, is briefly outlined and compared with previous studies. It is found that atmospheric heat fluxes play a key role in establishing the interdecadal SST pattern in the midlatitudinal North Pacific. These fluxes would excite a high baroclinic mode, igniting a series of events that move around the basin. In midlatitudes, interdecadal SSTs are most sensitive to the heat flux forcing along the eastern boundary north of about 30°N, in the western North Pacific at about 40°N, and along 20°N eastward of the date line; in the eastern North Pacific and north of 40°N, interdecadal pycnocline anomalies move across the Gulf of Alaska and toward the Aleutian Islands up to about the Kamchatka Peninsula, continuing to the southwest down to about 28°N. In their path, pycnocline oscillations induce SST changes in the Kuroshio-Oyashio Extension. On the other hand, in the eastern Tropics, the wind stress curl would induce interdecadal pycnocline oscillations that (between 10°and 20°N) propagate as Rossby waves, similar to those observed there for annual and interannual timescales, which, after crossing the date line, turn toward the north-northwest. All of these waves and/or events move or propagate within areas where the mean flow is of smaller amplitude than the phase speed in the direction of motion. In addition, the results presented here would suggest that a process similar to a servomechanism, and as envisaged by other authors, is present along 40°N, suggestive of an active ocean-atmosphere interaction over this area. Major differences are found between decadal and interdecadal dynamics.
机译：利用NCEP-NCAR再分析风应力和热通量的等渗海洋模型，研究了1958〜97年期间太平洋年代际变化。在模型的可变模式与其他研究人员从100年的观察和理论预测中获得的模式之间找到了合理的共识。与以前的观测工作相一致，年代际和年代际时标具有不同的描述，并且从这项研究中建议它们确实具有不同的动力学。这项研究的重点是海洋年代际变化的动力学，即约20年的时间尺度。简要概述了十年时间尺度，即10年，并与以前的研究进行了比较。研究发现，大气热通量在建立北太平洋中纬度年代际SST模式方面起着关键作用。这些通量将激发高斜压模式，引发围绕盆地移动的一系列事件。在中纬度，年代际海表温度对沿东边界以北约30°N，在北太平洋西部约40°N和沿日期线以东20°N的热通量最为敏感；在北太平洋东部和北纬40°以北，年代际多面线异常横穿阿拉斯加海湾，一直向阿留申群岛移动，直到堪察加半岛附近，再一直向西南向下至约28°N。在它们的路径中，比索环振荡会引起黑潮-延潮扩展中的SST变化。另一方面，在东热带地区，风应力的卷曲会引起年代际的跃点振荡（在10°和20°N之间）以Rossby波传播，类似于在那里观测到的年度和年际时标，在穿越日期线，朝西北偏北。所有这些波和/或事件在平均流的幅度小于运动方向上的相速度的幅度内移动或传播。此外，这里提出的结果表明，在40°N处存在类似于伺服机制的过程，并且正如其他作者所设想的那样，表明该区域海洋与大气之间存在活跃的相互作用。发现年代际和年代际动力学之间的主要差异。

著录项

  • 来源
    《Journal of Physical Oceanography》 |2003年第12期|p.2483-2503|共21页
  • 作者

    GUILLERMO AUAD;

  • 作者单位

    Climate Research Division, Scripps Institution of Oceanography, 9500 Gilman Drive, Dept. 0224, La Jolla, CA 92093-0224;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋学;
  • 关键词

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