当前位置: X-MOL 学术J. Oper. Oceanogr. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Development of a feature-oriented regional modelling system for the North Brazil Undercurrent region (1°–11°S) and its application to a process study on the genesis of the Potiguar Eddy
Journal of Operational Oceanography ( IF 3.1 ) Pub Date : 2020-03-23 , DOI: 10.1080/1755876x.2020.1743049
Ana Paula Morais Krelling 1, 2 , Avijit Gangopadhyay 2 , Ilson da Silveira 3 , Felipe Vilela-Silva 2, 3
Affiliation  

ABSTRACT

Key elements of a Feature-oriented regional modelling system (FORMS) in the Western Equatorial Atlantic (1°–11°S) are developed for possible application in an operational forecast system as well as in process-oriented studies. This equatorial margin region is dominated by the northwestward flowing near surface North Brazil Undercurrent (NBUC) and the southeastward Deep Western Boundary Current (DWBC). Specifically, we investigate the genesis of a subsurface frontal meander of the NBUC, centred at about 4°S, 36.5°W, called the Potiguar Eddy (PE). The Feature Models (FMs) of NBUC and DWBC are first developed from observed velocity data, with temperature calculated through the thermal wind equation, and salinity from climatology. Two numerical experiments were then set up for the process study, (i) a realistic NBUC + DWBC experiment, with maximum depth of 5500 m, and (ii) a NBUC-only experiment, with maximum depth limited to 1500 m. Results conclude that the PE can be generated by a velocity field containing only the NBUC, and the DWBC – induced vertical shear seems to play a part on the eddy’s baroclinic characteristics (vertical extent and strength). This study highlights the potential of applicability of FORMS for operational forecasts and for process studies in similar regions of the world ocean where currents and topography interact to create permanent and/or semi-permanent eddies.



中文翻译:

巴西北部潜流区域(1°–11°S)面向特征的区域建模系统的开发及其在波蒂瓜涡流成因过程研究中的应用

摘要

开发了西赤道大西洋(1°–11°S)中面向特征的区域建模系统(FORMS)的关键要素,以便可能应用于业务预报系统以及面向过程的研究。该赤道边缘区域以近地表巴西北部暗流(NBUC)和东南向的深西部边界流(DWBC)为主导。具体来说,我们研究了 NBUC 的地下正面曲流的成因,中心位于 4°S,36.5°W,称为 Potiguar 涡流 (PE)。NBUC 和 DWBC 的特征模型 (FM) 首先是根据观测到的速度数据开发的,温度通过热风方程计算,盐度通过气候学计算。然后为过程研究设置了两个数值实验,(i) 一个现实的 NBUC + DWBC 实验,最大深度为 5500 m,以及 (ii) 仅 NBUC 实验,最大深度限制为 1500 m。结果得出结论,PE 可以由仅包含 NBUC 的速度场产生,而 DWBC 引起的垂直剪切似乎对涡流的斜压特性(垂直范围和强度)起作用。本研究强调了 FORMS 在世界海洋类似区域的业务预测和过程研究的适用性潜力,在这些区域中,洋流和地形相互作用以产生永久和/或半永久涡流。而 DWBC 诱导的垂直剪切似乎对涡流的斜压特性(垂直范围和强度)起作用。本研究强调了 FORMS 在世界海洋类似区域的业务预测和过程研究的适用性潜力,在这些区域中,洋流和地形相互作用以产生永久和/或半永久涡流。而 DWBC 诱导的垂直剪切似乎对涡流的斜压特性(垂直范围和强度)起作用。本研究强调了 FORMS 在世界海洋类似区域的业务预测和过程研究的适用性潜力,在这些区域中,洋流和地形相互作用以产生永久和/或半永久涡流。

更新日期:2020-03-23
down
wechat
bug