Comparative analysis of significant wave height between a new Southern Ocean buoy and satellite altimeter |
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| Authors: | Jianjun Kang Runyu Mao Yiting Chang Hongli Fu |
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| Institution: | 1. National Ocean Technology Center, Tianjin, China;2. National Marine Data and Information Service, Tianjin, China |
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| Abstract: | In-situ observation is restricted by the strong wind and waves in the Southern Ocean.A Westerlies Environmental Monitoring Buoy(WEMB)was firstly deployed in the Southern Ocean during China's 35th Antarctic Expedition,facilitating further understanding of the oceanic environmental characteristics of this region.With the develop-ment of technology and the improvement of data processing methods,the accuracy of satellite altimeter products is constantly improved,thus making it possible to inspect and evaluate the in-situ observation data.Based on the L3 products of multiple satellite altimeters,this paper analyzes and corrects the significant wave height(SWH)data of WEMB by means of data matching,error statistics,and linear least-squares fitting.Through this study,the authors obtained the following results.The effect of gravitational acceleration changes with latitude on SWH accuracy is fairly small.Due to the low response of WEMB to high-frequency waves,there is a systematic devia-tion.A feasible correction method is therefore proposed to improve the SWH accuracy of WEMB.The temporal variation of the corrected SWH is highly consistent with that of the 10 m wind during the observation period,and its average value reaches 3.8 m. |
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| Keywords: | Mooring buoy Southern ocean Satellite altimeter Significant wave height |
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