Validation Study of FY-3A-TOU Total Ozone Using Ground-based Data
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摘要: 通过地基臭氧总量观测, 对风云三号(FY-3A)气象卫星TOU (2009年7月至2013 年12月)臭氧总量开展检验分析. 结果显示, TOU臭氧总量与地基测值之间的线 性相关系数达到0.95以上, 相对差别(RD)为(-0.16±4.3)%. 赤道地区 RD随地基测值的上升明显,太阳天顶角(SZA)为70° 以上时TOU臭氧总 量明显下降, 75°~85°有-4%~-10% 不等的降幅. 云量变化(0~100%)或云高变化(1~15km)对RD的影 响在±2%以内. RD随着吸收性气溶胶(AI为正值)有-2%~-5%的 变化, 在南半球中纬度地区明显. TOU与地基Dobson, Brewer及SAOZ光谱仪测值 的RD分别为(0.6±0.17)%, (0.05±0.2)%, (0.04±0.01)%. 当地基臭氧总量在200DU以下时, TOU值低于Dobson或SAOZ测值; 而在 430~500DU时, TOU 高于SAOZ 值2%~6%. TOU分别与Dobson, Brewer, SAOZ的RD对SZA (70°以下)、云量变化均不敏感, 但TOU分 别与Brewer, SAOZ的RD在云高5km以上时或随AI的增加均出现一定的趋 势特征.Abstract: Total ozone from July 2009 to December 2013 measured by Total Ozone Unit (TOU) borne on the FY-3A meteorological satellite is validated with the ground-based observations over the global five latitudinal bands, the north pole (north to 63.5°N), middle north of hemisphere (23.5°N~63.5°N), tropic zone (23.5°N~23.5°S), middle of south hemisphere (23.5°S~63.5°S) and South Pole (south to 63.5°S). The results show that the linear correlated coefficient between TOU and the ground-based data is more than 0.95. The globally average TOU Relative Difference (RD) from the ground-based data is (-0.16±4.3)%, with the respective of (0.6±3.8)%, (-0.5±3.9)%, (1.8±3.1)%, (-0.6±3.7)% and (-0.1±3.9)% over the 5 north-southward bands. The sensitivity tests suggest that TOU RD over the tropical zone evidently rises with the growth of the ground-based total ozone. The global TOU ozone RD reduces as the Solar Zenith Angle (SZA) is greater than 70° and the RD may reach from -4% to -10% as SZA from 75° to 85°. The TOU ozone RD is insensitive to the variability of cloud amounts and altitudes: the RD ranges within ±2% as the cloud amount changes from 0 to 100% or the cloud altitude changes from 1 to 15km. The TOU ozone RD is sensitive to the absorptive aerosol characterized by the positive Aerosol Index (AI), and it may decrease from -2% to -5% over the middle of south hemisphere as the AI from 1 to more than 2. The globally respective RD of TOU ozone to Dobson, Brewer and SAOZ observations is (0.6±0.17)%, (0.05±0.2)% and (0.04±0.01)%. TOU RD is generally negative as the Dobson or SAOZ total ozone is lower than 200DU, while it generally 2%~6% as SAOZ total ozone is 430~500DU. The respective RD of TOU to Dobson, Brewer and SAOZ is also insensitive to variations of SZA (less than 70°) or the cloud amounts, however, the RD of TOU respective to Brewer and SAOZ may behavior some small trend with the occurrence of high cloud or positive AI.
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Key words:
- TOU total ozone /
- Ground-observed data /
- Relative Difference (RD) /
- Comparison analysis
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