Climate changing in microwave telecommunication links (sleet)

Almreri, Abdueraouf R. K.

Abstract

Rec. ITU-R P.530-12 provides an internationally recognised prediction model for the fading due to wet snow (sleet) on horizontal, terrestrial microwave links. An important parameter in this model is the altitude difference between the link and the melting layer.  This is the layer near the zero-degree isotherm (ZDI) where falling ice begins to melt into rain. Melting ice particles produce a specific attenuation up to four times that of the associated rain rate. This work will examine NOAA NCEP/NCAR Reanalysis 1 data to identify trends in the ZDI height o. ZDI height is shown to have increased by approximately 10 m per year over the last 30 years in part of Europe as it shows some decrease in other parts of the world approximately 5 m a year. This has led to a slow decrease in the incidence of fading due to wet ice over southern Europe but isolated large increases in regions where the air temperature near the ground was close to zero during winter. The annual distribution of ZDI heights relative to the annual mean are calculated and compared to models in Rec. ITU-R P.530-12 as the theory for attenuation provided and plot of the mean ZDI Height will be compared with Rec. ITU-R 840-4.

Citation

Almreri, A. R. K. (2010). Climate changing in microwave telecommunication links (sleet). (Thesis). University of Hull. Retrieved from https://hull-repository.worktribe.com/output/4209571

• Thesis Type: Thesis
• Deposit Date: Sep 28, 2011
• Publicly Available Date: Feb 22, 2023
• Keywords: Engineering
• Public URL: https://hull-repository.worktribe.com/output/4209571
• Additional Information: Department of Engineering, University of Hull
• Award Date: Sep 1, 2010