Calibration and verification of sea surface wind speed from satellite altimeters
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摘要:
为了改善不同卫星高度计海面风速数据之间的一致性，以浮标数据为基准，对国内的HY-2A和国外的T/P、GFO、Jason-1、Envisat、Jason-2、CryoSat-2共7颗卫星高度计的海面风速数据进行了分析，给出了各个卫星高度计的海面风速校准公式，并对其校准效果进行了验证。验证结果表明：各个卫星高度计的海面风速在经过校准后，与浮标海面风速差异的均值和均方根都有所降低，其中HY-2A最为显著。经过校准后所有卫星高度计的海面风速与浮标海面风速差异的均值都在±0.2 m/s以内。除了HY-2A、GFO和Jason-1，其余4颗卫星高度计校准后的海面风速与浮标海面风速差异的均方根都在1.6 m/s以下。由此可以得出结论，利用本文的校准公式对各个卫星高度计（特别是HY-2A卫星高度计）的海面风速进行校准，可以有效减少其与浮标海面风速之间的差异。
Abstract:In order to improve the consistency of sea surface wind speed (SSWS) data from different satellite altimeters,the SSWS data from the HY-2A,T/P,GFO,Jason-1,Envisat,Jason-2,and CryoSat-2 satellite altimeter are collected,and compared with NDBC buoy data. Then,the calibration formulas are given,and the calibration results are investigated. The results show that both the mean values (MVs) and root mean squares (RMSs) of the differences between the SSWS data from the satellite altimeters and the buoys decrease after the calibrations,and the case of the HY-2A satellite altimeter is most remarkable. The MVs are within ±0.2 m/s,and the RMSs are below 1.6m/s except the HY-2A,GFO,and Jason-1 satellite altimeters. Therefore,the calibration formulas presented in this paper are useful for reducing the differences between the SSWS data from the satellite altimeters and the buoys (especially for HY-2A satellite altimeter).
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Key words:
- HY-2A /
- satellite altimeter /
- sea surface wind speed /
- data calibration
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