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Estimating 1 min rain rate distributions from numerical weather prediction
Author(s) -
Paulson Kevin S.
Publication year - 2017
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1002/2016rs006111
Subject(s) - numerical weather prediction , meteorology , rain rate , environmental science , distribution (mathematics) , scale (ratio) , mathematics , geography , precipitation , mathematical analysis , cartography
Internationally recognized prognostic models of rain fade on terrestrial and Earth‐space EHF links rely fundamentally on distributions of 1 min rain rates. Currently, in Rec. ITU‐R P.837‐6, these distributions are generated using the Salonen‐Poiares Baptista method where 1 min rain rate distributions are estimated from long‐term average annual accumulations provided by numerical weather prediction (NWP). This paper investigates an alternative to this method based on the distribution of 6 h accumulations available from the same NWPs. Rain rate fields covering the UK, produced by the Nimrod network of radars, are integrated to estimate the accumulations provided by NWP, and these are linked to distributions of fine‐scale rain rates. The proposed method makes better use of the available data. It is verified on 15 NWP regions spanning the UK, and the extension to other regions is discussed.