FY-3C微波成像仪海上大气可降水产品质量检验

Validation of FY-3C MWRI Total Precipitable Water Products

中国自主研制的第二代极轨气象卫星的首颗业务星风云三号C星(FY-3C)于2013年9月23日发射升空。微波成像仪(MWRI)作为FY-3C上携带的重要微波载荷之一,能够实现对大气、海洋和陆地的全天时监测。其中,MWRI海上大气可降水量(TPW)产品在数值预报模式以及气候变化研究中具有很重要的应用价值,但是应用效果的好坏往往受产品精度的制约。使用长达4年的卫星观测资料,通过MWRI TPW业务产品和无线电探空及专用传感器微波成像仪(SSMIS)TPW业务产品的比较,对MWRI TPW产品(包括轨道产品、日产品和月产品)的质量进行检验。结果表明,轨道产品和地面实际观测的探空数据的平均相对误差在7%左右,均方根误差为2.6 mm;日产品和SSMIS日产品的均方根误差约为3 mm,和探空日产品的均方根误差小于2.1 mm;月产品和SSMIS月产品的均方根误差小于1.3mm。表明FY-3C MWRI TPW业务产品长期以来一直稳定运行且精度较高,具备实际应用潜力。

FY-3C is the second generation polar meteorological satellite which was developed by China independently and launched in 2013.MWRI(microwave radiance imager)is an important microwave load which can monitor air,ocean and land.As a product of MWRI,TPW(total precipitable water)can be used in numerical weather prediction and climate research.But,the effect of the application relies on the accuracy of TPW.Based on the 4-year satellite observation data,the quality of TPW products is validated by comparing the TPW products with the radiosonde TPW or SSMIS TPW products.As a result,the RMSE(root mean square error)of orbit product is 2.6 mm and the average relative error is 7%.What’s more,the RMSE of day product is 3 mm and 2.1 mm when separately compared with SSMIS and radiosonde.The accuracy of month product is stable and the RMSE is less than 1.3 mm.Above findings show that FY-3C MWRI TPW products have a high precision and good stability,and have the application ability in weather and climate field.