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A rain height model to predict fading due to wet snow on terrestrial links

Paulson, K.; Al-Mreri, A.


K. Paulson

A. Al-Mreri


Recommendation ITU‐R P.530‐13 provides an internationally recognized prediction model for the fading due to wet snow on low‐elevation, terrestrial microwave links. An important parameter in this model is the altitude difference between the link and the rain height. The top of rain events is usually assumed to be 360 m above the zero‐degreeisotherm (ZDI). Above this height, hydrometeors are ice with low specific attenuation. Below this level, melting ice particles produce a specific attenuation up to 4 times that of the associated rain rate. A previous paper identified increasing ZDI height trends across northern Europe, North America and central Asia with slopes up to 10 m/yr. This paper examines NOAA National Centers for Environmental Prediction-National Center for Atmospheric Research Reanalysis 1 data to identify global distributions of ZDI height around mean levels that increase linearly over time. The average annual distribution of ZDI heights relative to the annual mean are calculated for each NOAA Reanalysis grid square and skew normal distributions are fitted. These are compared to models in Recommendation ITU‐R P.530‐13 and Recommendation ITU‐R 452‐14. The effects of ZDI trends and the calculated skew normal distributions are illustrated using calculated trends in fading due to wet snow for two notional 38 GHz links in Edinburgh. A slow decrease in the incidence of fading due to wet snow is predicted over most of Europe. However, some links could experience increases where warming has increased the wetness of snow.


Paulson, K., & Al-Mreri, A. (2011). A rain height model to predict fading due to wet snow on terrestrial links. Radio science, 46(4), Article RS4010.

Journal Article Type Article
Acceptance Date May 12, 2011
Online Publication Date Aug 27, 2011
Publication Date Sep 7, 2011
Deposit Date Nov 13, 2014
Publicly Available Date Nov 13, 2014
Journal Radio science
Print ISSN 0048-6604
Publisher American Geophysical Union
Peer Reviewed Peer Reviewed
Volume 46
Issue 4
Article Number RS4010
Keywords Climate change; Fading; Rain height; Sleet; Wet snow; Zero degree isotherm
Public URL
Publisher URL
Additional Information Copy of article first published in Radio science, 2011, v.46, issue 4


Article.pdf (852 Kb)

Copyright Statement
Copyright 2011 by the American Geophysical Union

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