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Analysis of the Causes of a low Cloud and low visibility Weather at Cangyuan Washan Airport

Advances in Aerospace Science and Technology 2023年第2期8卷 11-20页

作者： Yahan Zhong Wancheng Zhang Juzhang Ren Man Wang Yun Tao Yunnan Institute of Meteorological Sciences Kunming China Research Center for Disastrous Weather in Hengduan Mountain and low-Latitude Plateau CMA Kunming China

At 11:00 am on August 5, 2017, Cangyuan Washan Airport experienced low cloud and low visibility weather, accompanied by aircraft turbulence, which affected the normal operation of flights, which was closely related to the meteorological conditions at that time. Using the hourly reanalysis data of the European Centre for Medium-range Weather Forecast (ECMWF) Reanalysis 5 (ERA5), including Geopotential height, temperature, precipitation, wind field, specific humidity, vorticity and other elements, with a spatial resolution of 0.25° × 0.25°, this paper focuses on the horizontal distribution and vertical configuration of various physical quantities before and after the occurrence of low cloud and low visibility weather at the airport. The results indicate that the main influencing system of this low cloud and low visibility weather is the westward tropical depression. Before the occurrence of low cloud and low visibility weather, low-level water vapor converges and is accompanied by precipitation. The temperature decreases with precipitation, the near-surface wind direction changes, and the wind speed decreases.

关键词： low Clouds low visibility Vertical Velocity

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Research on the classification for road traffic visibility based on the characteristics of driving behaviour–a driving simulator experiment

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Journal of Intelligent and Connected Vehicles 2020年第1期3卷 30-36页

作者： Kun Wang Weihua Zhang Zhongxiang Feng Cheng Wang College of Civil Engineering Hefei University of TechnologyHefeiChina School of Automobile and Traffic Engineering Hefei University of TechnologyHefeiChina

Purpose–The purpose of this paper is to performﬁne classiﬁcation of road trafﬁc visibility based on the characteristics of driving behavior under different visibility ***/methodology/approach–A driving simulator experiment was conducted to collect data of speed and lane *** was used to explore the difference in driving behavior under different visibility ***–The results show that only average speed is signiﬁcantly different under different visibility *** the visibility reducing,the average vehicle speed *** road visibility conditions in a straight segment can be divided intoﬁve levels:less than 20,20-30,35-60,60-140 and more than 140 *** road visibility conditions in a curve segment can be also divided into four levels:less than 20,20-30,35-60 and more than 60 ***/value–Aﬁne classiﬁcation of road trafﬁc visibility has been performed,and these classiﬁcations help to establish more accurate control measures to ensure road trafﬁc safety under low-visibility conditions.

关键词： Speed Driving simulator experiment Lane position low visibility Trafﬁc safety

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Analysis of the Microphysical Structure of Heavy Fog Using a Droplet Spectrometer:A Case Study

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Advances in Atmospheric Sciences 2010年第6期27卷 1259-1275页

作者：牛生杰陆春松刘延刚赵丽娟吕晶晶杨军 Key Laboratory of Meteorological Disaster of Ministry of Education School of Atmospheric PhysicsNanjing University of Information Science & Technology Brookhaven National Laboratory Atmospheric Sciences Division

The microphysical properties of a long-lasting heavy fog event are examined based on the results from a comprehensive field campaign conducted during the winter of 2006 at Pancheng （32.2°N, 118.7°E）, Jiangsu Province, China. It is demonstrated that the key microphysical properties （liquid water content, fog droplet concentration, mean radius and standard deviation） exhibited positive correlations with one another in general, and that the 5-min-average maximum value of fog liquid water content was sometimes greater than 0.5 g m-3. Further analysis shows that the unique combination of positive correlations likely arose from the simultaneous supply of moist air and fog condensation nuclei associated with the advection of warm air, which further led to high liquid water content. High values of liquid water content and droplet concentration conspired to cause low visibility （〈50 m） for a prolonged period of about 40 h. Examination of the microphysical relationships conditioned by the corresponding autoconversion threshold functions shows that the collision-coalescence process was sometimes likely to occur, weakening the positive correlations induced by droplet activation and condensational growth. Statistical analysis shows that the observed droplet size distribution can be described well by the Gamma distribution.

关键词： fog microphysics positive correlation high liquid water content low visibility warm and moistair

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