高度计波高数据同化对印度洋海域海浪模式预报影响研究  

The impact of assimilation of altimeter wave data on wave forecast model in the north Indian Ocean

作　　者：齐鹏[1,2] 范秀梅[1,2] 

机构地区：[1]中国科学院海洋研究所海洋环流与波动重点实验室,山东青岛266071 [2]中国科学院大学,北京100039

出　　处：《海洋预报》2013年第4期70-78,共9页Marine Forecasts

基　　金：海洋公益性行业科研专项经费项目(201005033)和(201105002);国家"863"课题(2012AA091801)

摘　　要：为提高海浪模式预报的精度,改善初始场是途径之一。研制了基于最优插值(OI)方法的海浪数据同化并行程序模块,并将其植入第三代海浪模式WAVEWATCH IIITM,建立了印度洋海域海浪同化预报方法,使用卫星高度计波高数据进行了同化预报试验。OI模块的并行设计使得植入同化模块的海浪模式仍能以并行方式运行。文中5°S以北印度洋海域为目标区域,嵌套在WAVE-WATCH IIITM的全球网格中,使得目标区域开边界条件得到较好解决。同化数据使用Jason-2高度计测量有效波高(SWH)沿轨数据。海浪同化预报模式由大气模式WRF(Weather Research andForecasting)输出的1小时一次的海面10 m风场驱动。将同化的模式结果(SWH)、无同化的模式结果(SWH)分别与高度计沿轨数据(SWH)进行比较,表明同化改善模式预报初始场的效果是明显的。以同化初始场出发进行海浪预报试验,结果表明,高度计波高数据同化在一定程度上可改进海浪短期预报的精度。The parallel program module of assimilation of altimeter wave measurements is developed and im- planted into the full-spectral third-generation wind-wave model WAVEWATCH III. The target computational do- main is in the north of 5°S of the Indian Ocean, nested into the global implementation of the WAVEWATCH III. Considering incoming swell forcing from exterior to the target domain at boundaries, the problem is solved well by nesting. The wave model is forced by hourly surface wind field at 10 m from the atmospheric model of WRF （Weather Research and Forecasting）. In the process of model integration, wave heights measured by Jason-2 al- timeter on Dec. 17 th and 18 th, 2010 are assimilated into the model （After each time of assimilation, the new Sig- nificant Wave Height （SWH） is used to reconstruct the corresponding two-dimensional wave spectnax0. Model results of SWH with and without data assimilation are compared with the measured altimeter wave heights, re- spectively, which indicates that assimilation can be betters for the initial field.

关 键 词：WAVEWATCHIIITM 数据同化 最优插值(OI) 卫星高度计 有效波高(SWH) 

分 类 号：P731.22[天文地球—海洋科学]