The relationship between wet component of atmospheric refractivity and movement and landfall of tropical cyclone in the Bay of Bengal region

Midya, S. K.; Das, G. K.; Sarkar, A.

doi:10.1007/s00703-013-0266-4

Cited by 2 publications

(2 citation statements)

References 20 publications

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“…The dry term N dry depends only on pressure and temperature while the wet term Nwet varies with time and space and it is the dominant variable parameter because it depends on the presence of water vapour concentration and temperature of the atmosphere. These terms contributed 70% and the variability respectively to the total value of N [14], more so the wet path gives an indication of landfall and cyclone movement when it close to the coast [15]. Because radio signals refract over the whole signal path, hence the variation in any of these meteorological parameters causes significant changes in radio wave propagation [16] and temperature and liquid water content influenced attenuation due to the cloud [17].…”

Section: Radio Refractivity and Refractivity Gradientmentioning

confidence: 99%

Diurnal, Seasonal and Annual Variation of Microwave Radio Refractivity Gradient over Akure, South West Nigeria

Adediji

Dada

Ajewole

2019

PSIJ

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In this study, four years in-situ measurements of atmospheric parameters (pressure, temperature and relative humidity) were carried out. The measurement was by placing an automatic weather station at five different heights: ground surface, 50, 100, 150 and 200 m respectively on a 220 m Nigeria Television Authority TV tower in Akure, South Western Nigeria. The four years Data collected (January 2007 to December 2009 and January to December 2011) were used to compute radio refractivity and its gradient. The local effect of a location/ region cannot but looked into when designing effective radio link, hence the diurnal, seasonal and annual variations of the radio refractivity gradient were studied. Results showed that refractivity gradient steadily increases inthe hour of 8:30 and 9:30 to 18:00 during dry season throughout the years investigated, and decreases two hours in the rainy season than the dry season. The record shows that at 50 m altitude, the maximum and minimum values are 158 N-unit/km around 14:30 and - 286 N-unit/km around 13:30 to 14:00 hrs, LT during the dry and rainy season respectively. Seasonally, refractivity gradient is steeper with greater variability in the dry season months than in the wet season months.

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Section: Radio Refractivity and Refractivity Gradientmentioning

confidence: 99%

Diurnal, Seasonal and Annual Variation of Microwave Radio Refractivity Gradient over Akure, South West Nigeria

Adediji

Dada

Ajewole

2019

PSIJ

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“…Here we present the variation of wet component of atmospheric refractivity index (η w in ppm) during monsoon period over formula for troposphere as used by Midya et al (2013a). Mainly atmospheric pressure, temperature and relative humidity are used to calculate (η w ).…”

Section: Atmospheric Refractivity and Monsoon Over Kolkatamentioning

confidence: 99%

Preliminary results from the total lightning detector-cum-mini weather station installed at the Calcutta University

Midya

Pal

Dutta

et al. 2018

Preprint

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Abstract. We report preliminary results derived from the total lightning detector-cum-mini weather station installed at the Calcutta University during 2016. This detector is a part of Earth Networks Total Lightning Network (ENTLN) operated globally for ground-based monitoring of total lightning activity and forecasting of localized storm alert and severe weather conditions. This set up provides improved measurement of in-cloud (IC) lightning as well as cloud-to-ground (CG) lightning in addition to daily weather data. Severe weather such as thunder squall, Nor'wester, hailstorm, cyclone over the Gangetic West Bengal 5 can be studied in details based on total lightning activity along with other atmospheric and meteorological research using the weather data. Here we present some initial results from the analysis of total lightning measurements during the recent Nor'wester events occurred in and around Kolkata. We also present variation of wet component of atmospheric refractivity index during the monsoon season which can be used to declare the onset and withdrawal time of monsoon over Gangetic West Bengal.

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The relationship between wet component of atmospheric refractivity and movement and landfall of tropical cyclone in the Bay of Bengal region

Cited by 2 publications

References 20 publications

Diurnal, Seasonal and Annual Variation of Microwave Radio Refractivity Gradient over Akure, South West Nigeria

Diurnal, Seasonal and Annual Variation of Microwave Radio Refractivity Gradient over Akure, South West Nigeria

Preliminary results from the total lightning detector-cum-mini weather station installed at the Calcutta University

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