Plateau Meteorology

Plateau Meteorology >

2018 , Vol. 37 >Issue 6: 1749 - 1764

DOI: https://doi.org/10.7522/j.issn.1000-0534.2018.00037

Detection of Fog at Night by Using the New Geostationary Satellite Himawari-8

  • WANG Hongbin ,
  • ZHANG Zhiwei ,
  • LIU Duanyang ,
  • YUAN Chengsong ,
  • ZHOU Linyi ,
  • QIAN Wei
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  • Key Laboratory of Transportation Meteorology of China Meteorological Administration, Jiangsu Institute of Meteorological Sciences, Nanjing 210009, Jiangsu, China;Jiangsu Meteorological Service Center, Nanjing 210008, Jiangsu, China;Jiangsu Meteorological Observatory, Nanjing 210008, Jiangsu, China

Received date: 2017-12-26

  Online published: 2018-12-28

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Abstract

Himawari-8 is the new geostationary satellite of the Japan Meteorological Agency (JMA) and carries the Advanced Himawari Imager (AHI), which is greatly improved over past imagers in terms of its number of bands and its temporal/spatial resolution. In this work, two different methods for the detection of the different levels of fog at night by using the Himawari-8 were developed in China. The two different methods are the method of the difference between the 11.2 μm and 3.9 μm brightness temperatures (BTD3.9~11.2) and the method of 3.9 μm Pseudo-Emissivity (ems3.9). The 3.9 μm Pseudo-Emissivity is the ratio of the observed 3.9 μm radiance and the 3.9 μm blackbody radiance calculated using the 11.2 μm brightness temperature. We identified the parameters optimal threshold at the 2 400 stations and the grid points using the BTD3.9~11.2 and ems3.9 for different levels of fog. Results on land and sea from the two methods were compared with surface observations from 2 400 weather stations in China and CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation) VFM (Vertical Feature Mask) products. The results showed that both the method of BTD3.9~11.2 and the method of ems3.9 can accurately identify the different levels of fog and the accuracy of ems3.9 method is slightly better than the BTD3.9~11.2. The accuracy of two methods has increased significantly and the false alarm rate has significantly decreased with the decrease of the visibility. When the visibility was less than 50 m, the HR, FAR and KSS of the BTD3.9~11.2 method (the ems3.9 method) were 0.89 (0.90), 0.15 (0.15) and 0.74 (0.75), respectively. When mid-or high-level clouds were removed using surface temperature of the ground observations, the HR and KSS of two methods for the different levels of fog has increased significantly, and the FAR has significantly decreased. When the visibility was less than 1 000 m, the HR of the BTD3.9~11.2 method (the ems3.9 method) was increased to 0.81(0.85) from 0.71 (0.74), the FAR was decreased to 0.12 (0.13) from 0.27 (0.28), and the KSS was increased to 0.69 (0.72) from 0.44 (0.46). The KSS of two method increased by 0.23 and 0.26, respectively. Three cases analysis showed that the fog area can be clearly identified by using the BTD3.9~11.2, ems3.9 and RGB composite image. The results of the detection of sea fog by using Himawari-8 data and using CALIPSO VFM products have consistency.

Key words： Remote sensing; Himawari-8; fog; brightness temperatu; 3.9 μm pseudo-emiss

Cite this article

WANG Hongbin , ZHANG Zhiwei , LIU Duanyang , YUAN Chengsong , ZHOU Linyi , QIAN Wei . Detection of Fog at Night by Using the New Geostationary Satellite Himawari-8[J]. Plateau Meteorology, 2018 , 37(6) : 1749 -1764 . DOI: 10.7522/j.issn.1000-0534.2018.00037

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