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    Long term evolution of the surface refractivity for arctic regions

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    Abd-Alhameed_et_al_Radio_Science.pdf (1.631Mb)
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    Publication date
    2019-07
    Author
    Bettouche, Y.
    Kouki, A.
    Agba, B.
    Obeidat, Huthaifa A.N.
    Alhassan, H.
    Rodriguez, Jonathan
    Abd-Alhameed, Raed A.
    Jones, Steven M.R.
    Keyword
    Surface refractivity
    Water vapour pressure
    Vertical refractivity gradient
    Rights
    ©2019. American Geophysical Union. All Rights Reserved. Reproduced in accordance with the publisher's self-archiving policy.
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    In this paper, local meteorological data for a period of 35 years (from 1979 to 2013) from Kuujuaq station have been used to calculate the surface refractivity, N and to estimate the vertical refractivity gradient, dN1, in the lowest atmospheric layer above the ground. Monthly and yearly variations of the mean of N and dN1 are provided. The values obtained are compared with the corresponding values from the ITU maps. The long-term trend of the surface refractivity is also investigated. The data demonstrate that the indices N and dN1 are subject to an evolution which may have significance in the context of climate change (CC). Monthly means of N show an increasing departure from ITU-R values since 1990. Yearly mean values of the dN1 show a progressive decrease over the period of study. Seasonal means of dN1 show a decrease over time, especially for summer. Such a trend may increase the occurrence of super-refraction. However, currently available ITU-R recommendations for microwave link design assume a stationary climate, so there is a need for a new modelling approach.
    URI
    http://hdl.handle.net/10454/17153
    Version
    Published version
    Citation
    Bettouche Y, Kouki A, Agba B et al (2019) Long term evolution of the surface refractivity for arctic regions. Radio Science. 54(7): 602-611.
    Link to publisher’s version
    https://doi.org/10.1029/2018RS006671
    Type
    Article
    Collections
    Engineering and Informatics Publications

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