Numerical study of sea waves created by tropical cyclone Jelawat
- PDF / 685,311 Bytes
- 7 Pages / 595 x 842 pts (A4) Page_size
- 13 Downloads / 235 Views
Numerical study of sea waves created by tropical cyclone Jelawat LI Jie1∗ , QIAN Hongbao2 , LI hai1 , LIU Yu1 , GAO Zhiyi1 1
2
Key Laboratory of Research on Marine Hazards Forecasting, National Marine Environment Forecast Center, State Oceanic Administration, Beijing 100081, China Administrative Center for China’s Agenda 21, Beijing 100038, China
Received 23 January 2011; accepted 14 June 2011 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2011
Abstract A numerical study of sea waves generated by tropical cyclone Jelawat is carried out using the cycle 4 version of the WAM. The model domain currently covers the latitudes 20◦ –45◦ N and longitudes 115◦ –135◦ E, and the model spatial resolution reaches 0.25◦ ×0.25◦ . Comparison of the model results with buoy observations reveals that the model can fairly reproduce the temporal variation of observed waves. Two-dimensional comparison is also made against the satellite altimeter significant wave heights derived from TOPEX/POSEIDON and ERS-2 data, showing high quality of the model performance. Key words: wave model, tropical cyclone Jelawat, simulation, altimeter wave height
oped at the Ocean Modeling Branch (OMB) of the Environmental Modeling Center (EMC) of the National Centers for Environmental Prediction (NCEP), is used to simulate the wind wave during the year 1996 with wind input of NCEP reanalysis data. Analysis of significant wave heights from the WAVEWATCH III and TOPEX/Poseidon altimetry was made by Qi et al. (2003). Wave information is of great important in ship navigation and offshore oil production in the East China sea. So far, some research program that aims to improve the operational numerical wave forecast for the China’s seas have been implementing at the NMEFC. Two important improvements have been made, including the use of the WAM4 and increase of model spatial resolution from 1.0◦ to 0.25◦ . One would expect a better representation of wave prediction. The first result made by Liu et al. (1999) has demonstrated that the increase of model resolution can significantly improve the wave model result. The primary goal of this work is to investigate the ability of WAM4 in reproducing the observed waves in the East China Sea. To address this goal, a numerical study of ocean wind waves created by the tropical cyclone Jelawat is performed using the WAM4. Two kinds of data, buoy and satellite altimeter measure-
1 Introduction The hybrid model, developed by Wen et al. (1989), has been used for providing real-time wave forecast at the National Marine Environment Forecasting Center (NMEFC), the State Oceanic Administration since 1993. The model domain covers 10◦ – 45◦ N and 105◦ –155◦ E, and the grid resolution is 1◦ ×1◦ . The model performance indicates that it can usually be tuned to supply useful results for operational purpose (Yang et al., 1995). Because of the shortcomings of the hybrid model (for instance, the diversion of wind wave and swell; the poor description of sea state under rapid changing wind fields), scientists have put
Data Loading...
