Short-Term Predictability of the Bay of Bengal Region Using a High-Resolution Indian Ocean Model

IF 2 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Marine Geodesy Pub Date : 2021-03-06 DOI:10.1080/01490419.2021.1894273

L. Pandey, S. Dwivedi, Matthew J. Martin

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引用次数: 2

Abstract

Abstract An ocean circulation model, Nucleus for European Modelling of the Ocean (NEMO version 3.6) is customized to run at high-resolution over a regional domain [30oE-105oE; 20oS-30oN] in the Indian Ocean. It uses horizontal resolution of 1/12° in longitude/latitude and 75 levels in the vertical direction. The model well captures the observed space-time variations of temperature and salinity at the surface and subsurface, and the surface currents and eddy kinetic energy. The short-term spatio-temporal predictability of the Bay of Bengal (BoB) region is quantified using the model currents. The Lagrangian measure of predictability, Finite Time Lyapunov Exponent (FTLE) is compared with the Eulerian measure (Okubo-Weiss parameter). The regions of chaotic stirring are identified in the BoB. The FTLE analysis reveals that the predictability on a biweekly time scale in the BoB is minimum during October-November, and the highest during May to July. The FTLE is shown to serve as a useful tool for planning targeted observations in the BoB region.

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使用高分辨率印度洋模式对孟加拉湾地区的短期可预测性

摘要一个海洋环流模型，欧洲海洋建模核心（NEMO 3.6版）被定制为在印度洋的区域域[30oE-105oE；20oS-30oN]上以高分辨率运行。它在经度/纬度上使用1/12°的水平分辨率，在垂直方向上使用75级。该模型很好地捕捉到了观测到的地表和地下温度和盐度的时空变化，以及地表电流和涡流动能。孟加拉湾（BoB）地区的短期时空可预测性使用模型洋流进行量化。将可预测性的拉格朗日测度，有限时间李雅普诺夫指数（FTLE）与欧拉测度（大久保-维斯参数）进行了比较。在BoB中确定了混沌搅拌的区域。FTLE分析显示，英国央行每两周一次的可预测性在10月至11月期间最低，在5月至7月期间最高。FTLE被证明是规划BoB地区目标观测的有用工具。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Marine Geodesy 地学-地球化学与地球物理

CiteScore

4.10

自引率

6.20%

发文量

审稿时长

>12 weeks

期刊介绍： The aim of Marine Geodesy is to stimulate progress in ocean surveys, mapping, and remote sensing by promoting problem-oriented research in the marine and coastal environment. The journal will consider articles on the following topics: topography and mapping; satellite altimetry; bathymetry; positioning; precise navigation; boundary demarcation and determination; tsunamis; plate/tectonics; geoid determination; hydrographic and oceanographic observations; acoustics and space instrumentation; ground truth; system calibration and validation; geographic information systems.