福建海雾的CALIOP遥感监测及基于Himawari-8的云下雾光谱特征分析*

doi:10.11978/2022215

Abstract

Abstract:

Sea fog, as a hazard weather, affects maritime transportation and military activities. The coastal area of Fujian province is a national strategic area characterized by frequent sea fog. It is essential to monitor and study the sea fog in this area. cloud-aerosol lidar with orthogonal polarization (CALIOP) can detect the vertical structure characteristics of sea fog due to its vertical penetration through laser. Thus, it is very suitable for sea fog monitoring. In this paper, firstly, remote sensing monitoring of sea fog over the coastal area of Fujian was carried out through CALIOP L1 level 532 nm total attenuated backscattering and vertical feature mask (VFM) data. Based on the physical characteristics of sea fog, the detection range of sea fog was expanded. Secondly, the vertical characteristics of sea fog in this area were analyzed and it was found that subcloud fog occurred frequently. To explore the spectral characteristics of the subcloud fog and develop a high time coverage and large-scale synchronous sea fog monitoring algorithm. Besides, the spectral differences of cloud, pure fog, and subcloud fog were compared based on Himawari-8 data. According to the results, in the daytime, the spectral characteristics of pure fog and subcloud fog were not significantly different in each band, and the reflectance of bands 1~4 was much lower than that of cloud pixels; at night, the brightness temperature of pure fog at 3.9 μm band was generally lower than that of subcloud fog. It is expected to improve the monitoring accuracy of sea fog in Fujian Province by distinguishing cloud, pure fog, and subcloud fog based on the above spectral characteristics.

Key words: sea fog, satellite remote sensing, Fujian

HU Chenyue, QIU Zhongfeng, LIAO Kuo, ZHAO Dongzhi, WU Daomao. CALIOP remote sensing monitoring of the Fujian sea fog and spectral characteristics analysis of subcloud fog based on Himawari-8[J].Journal of Tropical Oceanography, 2023, 42(4): 104-112.

Figures/Tables 13

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References 25

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高度范围/km	网格点序号	水平分辨率/km	532nm垂直分辨率/m	1064nm垂直分辨率/m	高度区域
30.1~40.0	1~33	5	300	N/A	5
20.2~30.1	34~88	53	180	180	4
8.3~20.2	89~288	1	60	60	3
-0.5~8.3	289~578	1/3	30	60	2
-2.0~-0.5	579~583	1/3	300	300	1

高度范围/km		垂向分辨率/m	水平分辨率/m	每5km剖面数/条	剖面格点数/个
底部	顶部	垂向分辨率/m	水平分辨率/m	每5km剖面数/条	剖面格点数/个
-0.5	82	30	333	15	290
82	20.2	60	1000	5	200
20.2	30.1	180	1667	3	55
网格点总数/个		545

CALIOP remote sensing monitoring of the Fujian sea fog and spectral characteristics analysis of subcloud fog based on Himawari-8

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