收稿日期: 2010-01-06
修回日期: 2010-03-23
网络出版日期: 2011-10-10
基金资助
海洋公益性行业科研专项(200705027)
Optimal interpolation assimilation experiments based on Envisat ASAR ocean wave spectral data
Received date: 2010-01-06
Revised date: 2010-03-23
Online published: 2011-10-10
Supported by
海洋公益性行业科研专项(200705027)
基于第三代海浪数值模式LAGFD-WAM, 分别利用4种不同形式的各向同性背景误差相关函数进行了Envisat 高级合成孔径雷达(ASAR)海浪谱资料的最优插值同化试验。与4个浮标实测数据的比较验证表明, ASAR海浪谱资料的最优插值能够有效地改进海浪模式有效波高的模拟。4种不同形式的各向同性背景误差相关函数的同化结果相差不大, 决定同化效果好坏的关键是对相关距离尺度的选取。针对自回归形式的背景误差相关函数的试验结果表明, 相关距离尺度的量级在400—500km时同化效果最好, 此时同化后的模式有效波高均方根误差比未同化时相对减小了26%。
任启峰,张杰,尹训强,杨永增, . Envisat ASAR海浪谱资料的最优插值同化试验[J]. 热带海洋学报, 2010 , 29(5) : 17 -23 . DOI: 10.11978/j.issn.1009-5470.2010.05.017
With the third generation wave model named LAGFD-WAM, optimal interpolation assimilation experiments are performed based on Envisat Advanced Synthetic Aperture Radar (ASAR) ocean wave spectral data using four different iso-tropic background error correlation functions. The experiment results are compared with observation data from four different moored buoys. The results show that the optimal interpolation of ASAR wave spectral data can effectively improve the sig-nificant wave height (SWH) simulation of the wave model. The differences of assimilation effects among four experiments with different background error correlation functions are not obvious. The key to assimilation effects lies in the choice of cor-relation scale length. For the auto-regressive background error correlation function, the experiment results indicate that the assimilation effect is best when the correlation scale length is assumed to be from 400 to 500km, and that the root-mean-square error of model SWH data relatively decreases by 26% compared with that without assimilation.
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