摘要
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%。
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 isotropic 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 significant 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 correlation 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.
出处
《热带海洋学报》
CAS
CSCD
北大核心
2010年第5期17-23,共7页
Journal of Tropical Oceanography
基金
海洋公益性行业科研专项(200705027)
关键词
海浪谱
最优插值
背景误差相关函数
相关距离尺度
ocean wave spectrum
optimal interpolation
background error correlation function
correlation scale length
