Analysis of the microphysical structure of heavy fog using a droplet spectrometer: A case study

Niu, Shengjie; Lu, Chen; Liu, Yangang; Zhao, Lilong; Lü, Jingjing; Yang, Jing

doi:10.1007/s00376-010-8192-6

Cited by 57 publications

(43 citation statements)

References 35 publications

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“…Briefly, it indicates that number of fog days has increased from 38 (~250 h) in the beginning of 1980s to about 65 in recent years (~600 h). A similar trend is also seen in easterncentral China and linked to increased urban aerosol loading 27 . The results can be interpreted as an indication of the role of increasing air pollution and humidity 2,3 to increase fog events over this region.…”

Section: Fog Climatology and Trend In Delhisupporting

confidence: 71%

Winter Fog Experiment Over the Indo-Gangetic Plains of India

et al. 2017

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The objectives of the Winter Fog Experiment (WIFEX) over the Indo-Gangetic Plains of India are to develop better now-casting and forecasting of winter fog on various time-and spatial scales. Maximum fog occurrence over northwest India is about 48 days (visibility <1000 m) per year, and it occurs mostly during the December-February time-period. The physical and chemical characteristics of fog, meteorological factors responsible for its genesis, sustenance, intensity and dissipation are poorly understood. Improved understanding on the above aspects is required to develop reliable forecasting models and observational techniques for accurate prediction of the fog events. Extensive sets of comprehensive groundbased instrumentation were deployed at the Indira Gandhi International Airport, New Delhi. Major in situ sensors were deployed to measure surface micrometeorological conditions, radiation balance, turbulence, thermodynamical structure of the surface layer, fog droplet and aerosol microphysics, aerosol optical properties, and aerosol and fog water chemistry to describe the complete environmental conditions under which fog develops. In addition, Weather Forecasting Model coupled with chemistry is planned for fog prediction at a spatial resolution of 2 km. The present study provides an introductory overview of the winter fog field campaign with its unique instrumentation.

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Section: Fog Climatology and Trend In Delhisupporting

confidence: 71%

Winter Fog Experiment Over the Indo-Gangetic Plains of India

et al. 2017

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“…When the LWC was a maximum on 26 February, the average radius was 7.04 μm, but the concentration was only 148 cm 3 . This illustrates that large particles were principal contributors to the LWC [25].…”

Section: Calculation Of Lwc During Ice Accretionmentioning

confidence: 81%

Meteorological conditions of ice accretion based on real-time observation of high voltage transmission line

et al. 2011

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Meteorological conditions during ice accretion on the 500 kV high voltage transmission lines and test cables are presented, together with a calculation of liquid water content (LWC). The data include meteorological observations and real-time ice accretion on the transmission lines of the central China power grid, from 2008 to 2009 in Hubei Province. Also included are observations of ice thickness, microphysics of fog droplets, and other relevant data from a nearby automated weather station at Enshi radar station, from January to March 2009. Results show that temperature at Zhangen tower #307 was correlated with the temperature at Enshi radar station. The temperature on the surface of the high voltage transmission line was 2-4°C higher than ambient air temperature, although the temperatures were positively correlated. Ice formation temperature was about −2°C and ice shedding temperature was about −2 to −1°C on the high voltage transmission line, both of which were lower than the temperature threshold values on the test cable. Ice thickness was significantly affected by temperature variation when the ice was thin. The calculated LWC was correlated with observed LWC, although the calculated value was greater.

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“…Prior research has shown that the attenuation resulting from this phenomenon is of a magnitude around 0.5-1 dB . Figure 12a shows the attenuation caused by atmospheric gases for microwave frequencies up to 40 GHz and Figure 12b the attenuation caused by fog with different liquid water contents, including especially high values above 0.5 gr/m 3 (e.g., David et al, 2013;Gultepe et al, 2009;Niu et al, 2010) for the same range of frequencies.…”

Section: Results Analysismentioning

confidence: 99%

Using Cell‐Phone Tower Signals for Detecting the Precursors of Fog

David

Gao

2018

JGR Atmospheres

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In the last decade, published research has indicated the potential of commercial microwave links that comprise the data transmission infrastructure of cellular communication networks as an environmental monitoring technology. Different weather phenomena cause interference in the wireless communication links that can therefore essentially act as a low‐cost sensor network, already deployed worldwide, for atmospheric monitoring. In this study we focus on the attenuation effect caused in commercial microwave networks due to gradients in the atmospheric refractive index with altitude as a result of the combination of temperature inversions and falls in the atmospheric humidity trapped beneath them. These conditions, when combined with high relative humidity near ground level, are precursors to the creation of fog. The current work utilizes this novel approach to demonstrate the potential for detecting these preconditions of fog, a phenomenon associated with severe visibility limitations that can lead to dangerous accidents, injuries, and loss of lives.

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Analysis of the microphysical structure of heavy fog using a droplet spectrometer: A case study

Cited by 57 publications

References 35 publications

Winter Fog Experiment Over the Indo-Gangetic Plains of India

Winter Fog Experiment Over the Indo-Gangetic Plains of India

Meteorological conditions of ice accretion based on real-time observation of high voltage transmission line

Using Cell‐Phone Tower Signals for Detecting the Precursors of Fog

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