Operational implementation of the ATOVS processing procedure in KMA and its validation
Operational implementation of the ATOVS processing procedure in KMA and its validation
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DOI：
10.1007/bf02690798
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发表时间：
2003-05-01
影响因子：
5.8
通讯作者：
Suh, AS
中科院分区：
文献类型：
--
作者：
Ahn, MH;Kim, MJ;Suh, AS
韩国气象厅（KMA）自2001年5月起处理NOAA-16卫星上先进的TOVS（ATOVS）数据。业务生产利用EUMETSAT的AAPP（ATOVS和AVHRR处理包）和威斯康星大学的IAPP（国际ATOVS处理包）。对于初始猜测剖面，使用来自 NOAA/NCEP 全球航空模型的预测场（通常是 6 至 12 小时的预测场）。从 ATOVS 数据中检索到的剖面图平均数量分别约为 1,300 个上午和下午轨道，时间分别为世界标准时间 18 点左右和 06 点左右。检索到的温度和露点温度实时提供给预报员并用于预测模型的初始化。凭借先进的微波传感器（AMSU；先进微波探测单元），ATOVS 产品的精度预计将优于 TOVS 产品，尤其是在阴天条件下。事实上，对东亚地区 2001 年 5 月至 12 月 8 个月期间的同位无线电探空仪数据进行的验证研究的初步结果表明，与 TOVS 相比，ATOVS 产品对于多云天空的准确性有所提高，特别是对于较高海拔地区。在晴朗和多云条件下，ATOVS 产品和无线电探空仪数据之间的 RMS（均方根）差异约为 1.3 C，但靠近地面和较高海拔（约 200 hPa）的情况除外。在所有压力水平下，误差统计数据没有显着的时间变化。在水汽混合比的情况下，在较低海拔处表现出最大的差异，而晴朗天空情况下的精度比多云天空情况下要好得多。低海拔地区的偏差和RMSE约为0.557 g kg(-1)和2.5 g kg(-1)，并且随着海拔的增加而显着降低。
The Korea Meteorological Administration (KMA) has processed the data from the advanced TOVS (ATOVS) onboard NOAA-16 satellite since May 2001. The operational production utilizes the AAPP (ATOVS and AVHRR Processing Package) of EUMETSAT and IAPP (International ATOVS Processing Package) of the University of Wisconsin. For the initial guess profiles, the predicted fields (usually 6 to 12 hour forecasted fields) from the global aviation model of NOAA/NCEP are used. The average number of profiles retrieved from the ATOVS data is about 1,300 for each morning and afternoon orbit at about 18 and 06 UTC, respectively. The retrieved temperature and dew point temperatures are provided to forecasters in real time and used for initialization of prediction models. With the advanced microwave sensor (AMSU; Advanced Microwave Sounding Unit), accuracy of the ATOVS products is expected to be better than that of the TOVS products, especially in cloudy conditions. Indeed, the preliminary results from a validation study with the collocated radiosonde data during a 8-month period, from May to December 2001, for the East Asia region show an improved accuracy of the ATOVS products for cloudy skies versus the TOVS, especially for higher altitudes. The RMS (Root Mean Square) difference between the ATOVS products and radiosonde data is about 1.3 C for both clear and cloudy conditions, except for near the ground and at higher altitudes, at around 200 hPa. There is no significant temporal variation of the error statistics at all pressure levels. In case of the water vapor mixing ratio, the largest difference is shown at lower altitudes, while the accuracy is much better for the clear sky cases than the cloudy sky cases. The bias and RMSE at lower altitudes is about 0.557 g kg(-1) and 2.5 g kg(-1) and decrease significantly with increasing altitude.