Detection of Bright Band Heights from Vertical Profile of Radar Reflectivity in Akure, South Western Nigeria
Y. B. Lawal *
Department of Physics, University of Africa, Toru-Orua, Bayelsa State, Nigeria.
E. T. Omotoso
Department of Physics, Federal University of Technology, Akure, Ondo State, Nigeria.
*Author to whom correspondence should be addressed.
Abstract
Bright band is an important phenomenon that occurs in radar observations of precipitation. It is a layer of intense reflectivity caused by the melting of the snowflakes in the atmosphere. Accurate detection of bright band and its associated properties are essential for the estimation of precipitation rates and characterization of precipitation types as required in Agriculture, Aviation, Navigation, Telecommunication sectors etc. Bright Band Height (BBH) is a vital parameter in the determination of rain height, rain-induced radio signal attenuation and mitigation techniques. This paper presents an empirical study on the measurement of BBH and Zero Degree Isotherm Height (ZDIH) from Micro Rain Radar (MRR) data obtained in Akure, Nigeria. Vertical profile of radar obtained during stratiform rainy events were examined to detect bright bands and its features. Analysis of the result showed that the ZDIH varies between 4.48 and 4.60 km while the BBH also vary from 4.16 to 4.48 km during intense rainy events in September and October 2010. The derived propagation data would be needed for the optimization and improvement of quality of service (QoS) offered by earth-space links during rainy events in Akure and its environs.
Keywords: Bright band, precipitation rates, rain height, rain-induced attenuation, BBH, ZDIH
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Bhatta NP, Priya MG. Radar and its applications. International Journal of Circuit Theory Applications. 2017;10(3):9.
Fabry F, Zawadzki I. Long-term radar observations of the melting layer of precipitation and their interpretation. Journal of Atmospheric Sciences. 1995: 52(5):838-851.
Bringi VN, Chandrasekar V. Polarimetric doppler weather radar: Principles and applications. Cambridge University Press; 2001.
Battan LJ. Radar observation of the atmosphere. The University of Chicago Press, Chicago. 1973;324.
Houze RA. Stratiform precipitation in regions of convection, A meteorological paradox? American Meteorological Society Journal. 1997;78(10):2179–2196.
Brandes EA, Ikeda K, Zhang G, Ryzhkov AV, Schuur T. The bright band and associated precipitation structure observed in a narrow cold-frontal rainband. Journal of Applied Meteorology. 2002;41(11):1181-1194.
Olurotimi EO, Ojo JS. Rain height dynamics over some coastal cities of South Africa for earth-space links design. Journal of Physics: Conference Series. 2020;1874:012010.
Lawal YB, Falodun SE, Ojo JS. Temporal evolution of atmospheric parameter-profiling on rain height over two geoclimatic regions in Nigeria. Journal of Atmospheric and Solar-Terrestrial Physics. 2020;211:105482.
Lawal YB, Falodun SE, Ojo JS, Olurotimi EO. Geoclimatic characterization and latitudinal dependence of rain heights over Nigeria. Journal of Physics Conference Series, IOP Publishing. 2021;2034.
DOI: 10.1088/1742-6596/2034/1/012010
Adeleke O, Ojo JS, Ajewole MO. Determination of the calibration factor for the rain rate derived from TRMM satellite using MRR data over Akure, Nigeria. International Journal of Emerging Trends in Science and Technology. 2014;1(7): 1151-1165.
ISSN 2348-9480
Ojo JS, Akoma DB, Olurotimi EO. Dynamical evolution of vertical profile of rain structures observed using ground-based radar over a tropical station. Heliyon; 2021. DOI: 10.1016/j.heliyon.2021.e06888
Tomiwa AC, Ajewole MO, Ojo JS. IEEE 2014 XXXIth URSI General Assembly and Scientific Symposium (URSI-GASS) - Beijing, China - Classification of Tropical Convective and Stratiform Rains using a Micro Rain Radar and its Effect on Microwave Radio Signals in Akure. 2014; 1–4. DOI: 10.1109/ursigass.2014.6929268
Hooper JEN, Kippax AA. The bright band- a phenomena associated with radar echoes from falling rain. Quarterly Journal of the Royal Meteorological Society. 1950;76(328):125-132. Available:https://doi.org/10.1002/qj.49707632803
Austin PM, Bemis AC. A quantitative study of the “bright band” in radar precipitation echoes. Journal of Meteorology. 1950;7: 145-151.
Harris GN, Bowman KP, Shin DB. Comparison of freezing-level altitudes from the NCEP reanalysis with TRMM precipitation radar brightband data. Journal of Climate. 2000;13:4137-4148.
Awaka J, Iguchi T, Okamoto T. TRMM PR standard algorithm 2A23 and its performance on bright band detection. Journal of Meteorological Society of Japan. 2009;87(A):31-52.
Olurotimi EO, Sokoya O, Ojo JS, Owolawi PA. Observation of bright-band height data from TRMM-PR for satellite communication in South Africa. Journal of Atmospheric and Solar Terrestrial Physics. 2017;160: 24-33. DOI: 10.1016/j.jastp.2017.05.004