Compare and Analyze FY-2G Cloud Products to Ground-Based Manual Observed Cloud Amount

LI Ya; GUO Jianxia; CAO Yunchang; ZHOU Can; CHEN Yizhi

doi:10.7522/j.issn.1000-0534.2017.00027

Plateau Meteorology >

2018 , Vol. 37 >Issue 2: 514 - 523

DOI: https://doi.org/10.7522/j.issn.1000-0534.2017.00027

Compare and Analyze FY-2G Cloud Products to Ground-Based Manual Observed Cloud Amount

LI Ya ,
GUO Jianxia ,
CAO Yunchang ,
ZHOU Can ,
CHEN Yizhi

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China Meteorological Administration Meteorological Observation Centre, Beijing 100081, China;Chengdu University of Information Technology, Chengdu 610225, Sichuan, China;Civil Aviation Administration of China, North China Regional Administration, Beijing 100621, China

Received date: 2017-01-04

Online published: 2018-04-28

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Abstract

In order to promote the layout of automated ground-based cloud amount measurements, the cloud fraction (CFR) and the cloud total amounts (CTA) measured by geostationary satellite FY-2G were compared to the manual cloud amount measured at surface stations to analyze the concordance rate and deviation between each other. China was selected as study area and five months (July and October of 2015 and January, April and July of 2016) were selected to represent spring, summer, autumn and winter. There are five times manual cloud amount measurement (8 h, 11 h, 14 h, 17 h, 20 h) per day at 838 stations in China. The satellite data within 5 km radius of these station's points were used to produce point's data corresponding the manual cloud amount observed data, where the inverse distance to power method was used to the CFR data and the regional average method was used to the CTA data. It is considered consistent when the difference of two data is less than 2 tenths of sky cover at the same times. The results showed that the data of the satellite FY-2G cloud products' are usually lower than that of the manual observed at surface and the CTA is more obvious than the CFR. Then four levels of sky covers were divided by the manual cloud amount for further study. The level one is clear sky that cloud amount is less than 1 tenths of sky, the level two is partly cloudy that cloud covers 2~3 tenths of sky, the level three is cloudy that cloud covers 4~7 tenths of sky, and the level four is overcast that cloud amount is more than 8 tenths of sky. The comparison between satellite data and surface observed data was conducted time by time in each level. The results indicated that the performance of CTA and CFR are not good enough in all levels of sky cover and all over the country. In average, CTA is better than CFR in the condition of clear sky and overcast sky, while CFR is better than CTA in clear sky and partly cloudy sky. For the exploration of the performance' spatial distribution, the west and southwest part of China suffer from scarce capacity, especially in Yunnan, Guizhou, Guangxi and Guangdong province. So, we should plan more automated ground-based cloud observation in west and southwest part of China. It is obvious that although the satellite cloud product' could help us know more spatial information of cloud, a certain density of ground-based observation is needed to correct and promote the satellite products for further applications.

Key words： CTA; FY-2G satellite; CFR; ground-based observa; clouds observation l

Cite this article

LI Ya , GUO Jianxia , CAO Yunchang , ZHOU Can , CHEN Yizhi . Compare and Analyze FY-2G Cloud Products to Ground-Based Manual Observed Cloud Amount[J]. Plateau Meteorology, 2018 , 37(2) : 514 -523 . DOI: 10.7522/j.issn.1000-0534.2017.00027

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