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Journal of Tropical Oceanography >

2016 , Vol. 35 >Issue 6: 10 - 18

DOI: https://doi.org/10.11978/2016004

Marine Hydrography

Assimilation experiments of high frequency ground wave radar current in the northern coast of the South China Sea

  • ZHU Yuhang ,
  • ZENG Xuezhi ,
  • PENG Shiqiu
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  • 1. State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 510301, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. South China Sea Marine Prediction Center, State Oceanic Administration, Guangzhou 510310, China;

Received date: 2016-01-11

  Revised date: 2016-05-27

  Online published: 2016-12-15

Supported by

*感谢南海海洋研究所的高性能计算中心为本文数值模拟提供的技术支持。

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Abstract

Based on the Regional Oceanic Modeling System (ROMS) and multi-scale three-dimensional variational data assimilation scheme, the sea surface currents (SSCs) observed by double HF Radar stations Bohe and Doulong are assimilated into the ocean model. The effect of assimilation using different observation coverages and the sustainability of assimilation effect using different assimilation intervals are investigated through sensitivity experiments. The results show that the assimilation of HF Radar SSC significantly improves the SSC simulation. The experiments show no significant difference under different coverages of SSC observations when the coverage is over 40%, which indicates the background error covariance is able to make up for the missing data of the HF Radar SSC in space. The results also show that the sustainability of assimilation effect is influenced by the interval of assimilation: assimilating data too often will exacerbate the dynamic imbalance of the initial field, which makes the sustainability of the improvement worse, while a too large interval of assimilation will lose the assimilation effect before the next assimilation starts. The sustainability of the improvement in assisimilation achieves the best optimization when the assimilation interval is 6 or 12 hours. The sustainability of the improvement of model forecast after the assimilation lasts for 4 to 6 hours.

Key words： high frequency ground wave radar; three-dimensional variational assimilation; sea surface current assimilation; regional oceanic modeling system

Cite this article

ZHU Yuhang , ZENG Xuezhi , PENG Shiqiu . Assimilation experiments of high frequency ground wave radar current in the northern coast of the South China Sea[J]. Journal of Tropical Oceanography, 2016 , 35(6) : 10 -18 . DOI: 10.11978/2016004

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