Accuracy Validation of FY-4A Temperature Profile Based on Microwave Radiometer and Radiosonde

Wang Hong; Zhou Houfu; Wang Chen; Xia Yinan

doi:10.11898/1001-7313.20230304

Vol.34, NO.3, 2023

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Article Navigation > Journal of Applied Meteorological Science > 2023 > 34(3): 295-308

Wang Hong, Zhou Houfu, Wang Chen, et al. Accuracy validation of FY-4A temperature profile based on microwave radiometer and radiosonde. J Appl Meteor Sci, 2023, 34(3): 295-308. DOI: 10.11898/1001-7313.20230304.

Citation:

Wang Hong, Zhou Houfu, Wang Chen, et al. Accuracy validation of FY-4A temperature profile based on microwave radiometer and radiosonde. J Appl Meteor Sci, 2023, 34(3): 295-308. DOI: 10.11898/1001-7313.20230304.

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Accuracy Validation of FY-4A Temperature Profile Based on Microwave Radiometer and Radiosonde

DOI: 10.11898/1001-7313.20230304

Wang Hong^{1, 2},
Zhou Houfu^{3, 4
,
,},
Wang Chen³,
Xia Yinan⁵

1.
Key Laboratory for Meteorological Disaster Prevention and Mitigation of Shandong, Jinan 250031
2.
Shandong Weather Modification Office, Jinan 250031
3.
Anhui Institute of Meteorological Sciences, Hefei 230031
4.
Anhui Key Laboratory of Atmospheric Science and Satellite Remote Sensing, Hefei 230031
5.
Zhangqiu Meteorological Bureau of Shandong Province, Jinan 250200

Received Date: 2023-01-14
Rev Recd Date: 2023-02-28
Publish Date: 2023-05-31

Abstract

Abstract

To take full advantage of FY-4A temperature profile data to understand the evolutions of weather processes and nowcasting, based on the atmospheric temperature profile of radiosonde, microwave radiometer and FY-4A satellite from 1 January 2021 to 31 March 2022, 897 samples are matched and their deviation characteristics are evaluated. The results show that the correlation coefficient between FY-4A satellite temperature and that of microwave radiometer is 0.9891, and the correlation coefficient between FY-4A satellite temperature and that of radiosonde is 0.9820. The mean temperature of FY-4A satellite is 0.51℃ smaller than that of the radiosonde below 10 km height, and the standard deviation is 0.50℃. The mean temperature of FY-4A satellite is 0.53℃ larger than that of the microwave radiometer below 10 km, and the standard deviation is 0.75℃. FY-4A temperature is consistent with the mean deviation trend of the radiosonde at 0000 UTC and 1200 UTC. Compared with 0000 UTC, the deviation sample of FY-4A at 1200 UTC is less discrete. When there is precipitation, the temperature deviation of microwave radiometer and FY-4A gradually increases above 600 m height, and the deviation reaches the maximum (about 9.35℃) near 1500 m height. In the range of 3000-8500 m height, the deviation ranges from 1.35℃ to 5.10℃, and the standard deviation ranges from 1.41℃ to 4.99℃. In the case of precipitation, the deviation values and standard deviations of FY-4A temperature and radiosonde are small. Although the deviation values and standard deviations of FY-4A temperature and radiosonde are different at different heights in the whole layer, the deviation is between -0.31 and 3.60℃. When there are clouds, the mean deviation between FY-4A temperature and that of microwave radiometer is -0.40℃, and the mean standard deviation is 3.79℃. The overall mean deviation between FY-4A temperature and radiosonde is 0.31℃, and the mean standard deviation is 2.66℃. Both the deviation and standard deviation between FY-4A temperature and that of microwave radiometer are larger than those between FY-4A and radiosonde when there are clouds. The deviation and standard deviation of microwave radiometer temperature and that of radiosonde with FY-4A are small in clear sky. The above conclusions can provide reference for the further use of FY-4A satellite data, as well as for the quality control of FY-4A satellite data and its application in weather analysis and forecast.
- FY-4A;
- microwave radiometer;
- radiosonde;
- temperature profile;
- deviation characteristics

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References(45)

Figures and Tables

Fig. 1 Temperature deviation NCFADs at different heights from 1 Jan 2021 to 31 Mar 2022

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Fig. 2 Temperature deviation frequency distribution of microwave radiometer and radiosonde from FY-4A from 1 Jan 2021 to 31 Mar 2022

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Fig. 3 Temperature deviation frequency distribution of microwave radiometer and radiosonde from FY-4A at different heights from 1 Jan 2021 to 31 Mar 2022

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Fig. 4 Temperature deviation NCFADs of microwave radiometer and radiosonde from FY-4A at different times from 1 Jan 2021 to 31 Mar 2022

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Fig. 5 Temperature deviation NCFADs of microwave radiometer and radiosonde from FY-4A under different precipitation backgrounds from 1 Jan 2021 to 31 Mar 2022

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Fig. 6 Temperature deviation NCFADs of microwave radiometer and radiosonde from FY-4A under different cloud backgrounds from 1 Jan 2021 to 31 Mar 2022

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Table 1 Temperature profile information of microwave radiometer, radiosonde and FY-4A satellite

参数	微波辐射计	探空	FY-4A/GIIRS
最大探测高度	10 km	25 km	大气层顶
垂直层数	93	约90	101
垂直分辨率	20~400 m	6~700 m	200~1000 m
时间分辨率	2~3 s	12 h	2 h

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Table 2 Deviation statistics of microwave radiometer and radiosonde relative to FY-4A at different levels(unit:℃)

高度	探空与FY-4A的温度偏差		微波辐射计与FY-4A的温度偏差
高度	平均值	标准差	平均值	标准差
0~220 m	-0.04	0.72	-1.61	0.59
250~1000 m	0.16	0.71	-0.43	0.92
1040~3000 m	0.69	0.21	0.06	0.53
3100~8700 m	0.74	0.12	-0.73	0.10
9000~10000 m	0.48	0.15	0.75	0.10

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