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Large-scale climatic influences on precipitation and discharge for a British river basin

Lavers, David; Prudhomme, Christel; Hannah, David M.. 2010 Large-scale climatic influences on precipitation and discharge for a British river basin. Hydrological Processes, 24. 2555-2563. 10.1002/hyp.7668

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Abstract/Summary

This article aims to identify the large-scale climate variables that yield significant statistical relationships with precipitation and discharge for a British river basin (Dyfi). Ranked correlation analysis was performed between gridded ERA-40 atmospheric data and Dyfi precipitation and discharge for individual months. Precipitation and discharge demonstrate significant negative correlation with mean sea level pressure (MSLP). Strongest MSLP correlation areas move from north of Britain in winter to central Britain in summer; this shift is associated with a displacement of geopotential (Z) and zonal wind (U). Movement of significant correlation regions (not captured by the North Atlantic Oscillation Index) highlights the dynamic nature of precipitation and river flow generating weather systems throughout the year. Existence of strong significant correlation shows potential for exploiting large-scale climate variables in forecasting precipitation and river flow in Britain.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1002/hyp.7668
Programmes: CEH Topics & Objectives 2009 onwards > Water > WA Topic 3 - Science for Water Management > WA - 3.1 - Develop next generation methods for river flow frequency estimation and forecasting
CEH Sections: Harding (to 31.07.11)
ISSN: 0885-6087
Additional Keywords: large-scale climate, North Atlantic Oscillation, River Dyfi, discharge, precipitation, Great Britain
NORA Subject Terms: Hydrology
Date made live: 30 Sep 2010 13:52
URI: http://nora.nerc.ac.uk/id/eprint/11238

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