FY-4A卫星在宁夏短时强降水中的适用性研究

doi:10.13866/j.azr.2023.02.01

Abstract

Abstract:

By using FY-4A satellite data and artificial observation data of recent (2018-2020) severe precipitation cases in Ningxia, four different FY-4A satellite product types are examined in terms of their availability. Results show that: (1) The data transmission rate and physical preservation of FY-4A are sufficient to support real-time monitoring and early warning services; (2) The five kinds of products i.e., Cloud Type (CLT), Cloud Phase (CLP), Cloud Top Height (CTH), Quantitative Rainfall-Rate Estimation (QPE), and Tropopause Folding Depth (TFTP_Z_depth), have different performances in the case of severe convective weathers in Ningxia. Among them, CLT and CLP have good availability, making it possible to determine the type of cloud more accurately. However, both CTH and QPE have large errors and tend to be smaller, so they need to be revised in conjunction with other means. The relationship between CTT or TFTP_Z_depth products and recent severe precipitation is obvious. The high value of CTH is conducive to the occurrence of heavy precipitation but is not a necessary condition. Overall, the FY-4A satellite has certain usability and reference in severe convective weather in Ningxia, which can provide better data support for convective weather discrimination and artificial influence on weather operation.

Key words: FY-4A satellite, short-time severe precipitation, applicability analysis, statistical analysis, Ningxia

SHAO Jian,ZHANG Suzhao,CHEN Min,LI Qiang,ZHENG Youjiong,CHENG Yao,MA Ning. Application of FY-4A satellite data in short-time severe precipitation of Ningxia[J].Arid Zone Research, 2023, 40(2): 163-172.

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产品	英文缩写	调取参数及产品	最小分辨率
云相态	CLP	CLP（Cloud Phase，云相态，无单位）	4 km 1 km	① 60 min ② 15 min ③ 不定时
云类型	CLT	CLT（Cloud Type，云类型，无单位）
云顶高度	CTH	CTH（Cloud Top Height，云顶高，km）
降水估计	QPE	Precipitation（Quantitative Rainfall Rate Estimation，定量降水估测，mm）
对流层顶折叠检测	TFP	TFTP_Z_depth（Tropopause folding uppermost height，对流层折叠最深深度，km）

产品定义	取值范围	无云	暖水云或液态（水）	过冷水云或过冷液态	混合云或混合态	冰云或固态（冰）	卷云	多层云	不确定	太空	填充值	无云
云类型CLT	数值	0	2	3	4	5	6	7	9	126	127	0
云类型CLT	占比/%	11.09	24.46	6.96	54.6	0.72	1.11	0.84	0	0	0	11.09
云相态CLP	数值	0	1	2	3	4	-	-	-	126	127	0
云相态CLP	占比/%	7.99	14.11	15.52	60.12	2.21	-	-	-	0	0	7.99

云属	是否可降水	常见云底高度范围/m	云属	是否可降水	常见云底高度范围/m
积云	否	600~2000	高层云	是	2500~4500
积雨云	是	600~2000	高积云	否	2500~4500
层积云	是	600~2500	卷云	否	4500~10000
层云	否	50~800	卷层云	否	4500~8000
雨层云	是	600~2000	卷积云	否	4500~8000

	人工观测云底高度均值	探空估算云高均值	CTH观测值				相对误差				绝对误差
	人工观测云底高度均值	探空估算云高均值	最小值平均	最大值平均	平均值		与低值估算差	与高值估算差	与均值估算差		与低值估算差	与高值估算差	与均值估算差
对比值	1498	9189	2355	8905	6005		-6834	-284	-3183		6894	665	3224

绝对误差统计区间	与低值估算差	与高值估算差	与均值估算差
≤500 m	0.00	53.45	6.90
500~1000 m	17.15	22.41	15.17
1000~2000 m	10.10	24.14	13.74
2000~3000 m	5.17	0.00	22.71
>3000 m	67.58	0.00	41.48

Application of FY-4A satellite data in short-time severe precipitation of Ningxia

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	QPE相对偏差		QPE绝对误差
	15 min	1 h	15 min	1 h
最大值/mm	2.45	9.50	25.27	76.20
最小值/mm	－25.27	－76.20	0.11	0.88
平均值/mm	－4.09	－16.79	4.12	16.88
偏差偏小占比/%	99.28	98.77	-	-
偏差偏小占比/%	0.72	1.23	-	-
绝对误差值与大值比小于10%的占比/%	-	-	7.55	11.32
绝对误差值与大值比小于20%的占比/%	-	-	30.19	30.19
绝对误差值与大值比小于30%的占比/%	-	-	56.60	52.83

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