Himawari-8 satellite detection of morning terrain fog in a subtropical region

IF 4 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Climate Services Pub Date : 2025-02-17 DOI:10.1016/j.cliser.2025.100551

Huiyun Ma , Changjuan Chen , Zhicong Yi , Huihui Feng , Xiaojing Wu

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引用次数: 0

Abstract

This study explores the construction of a subtropical morning terrain fog detection algorithm for Himawari-8 data. Specifically, the clear sky surface suppression index is constructed to preliminarily remove the clear sky surface by combining Farneback optical flow method. The residual clear sky surface is further removed based on time series brightness temperature difference (BTD) between mid-infrared and thermal infrared. After that, the low-cloud elimination indicator is proposed to remove low clouds and mid-high clouds by coupling the brightness temperatures (BTs) at 10.4 μm with 12.3 μm, 13.3 μm and 8.6 μm with 9.6 μm. Finally, the fast-moving low clouds and residual mid-high clouds are removed by using the ratio of adjacent images at the 9.6 μm BT and the BT at 11.2 μm. The algorithm validation results show that the probability of detection, the false alarm rate and the critical success index are 0.801, 0.099 and 0.747, which show the acceptable performance. Meanwhile, the algorithm effectively avoids the influence of solar zenith angle. The research is capable of attaining near-real-time fog detection and offers pivotal technical support across diverse domains, including transportation planning, environmental management, human health, and agricultural production.

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来源期刊

Climate Services Multiple-

CiteScore

5.30

自引率

15.60%

发文量

期刊介绍： The journal Climate Services publishes research with a focus on science-based and user-specific climate information underpinning climate services, ultimately to assist society to adapt to climate change. Climate Services brings science and practice closer together. The journal addresses both researchers in the field of climate service research, and stakeholders and practitioners interested in or already applying climate services. It serves as a means of communication, dialogue and exchange between researchers and stakeholders. Climate services pioneers novel research areas that directly refer to how climate information can be applied in methodologies and tools for adaptation to climate change. It publishes best practice examples, case studies as well as theories, methods and data analysis with a clear connection to climate services. The focus of the published work is often multi-disciplinary, case-specific, tailored to specific sectors and strongly application-oriented. To offer a suitable outlet for such studies, Climate Services journal introduced a new section in the research article type. The research article contains a classical scientific part as well as a section with easily understandable practical implications for policy makers and practitioners. The journal''s focus is on the use and usability of climate information for adaptation purposes underpinning climate services.