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Evaporation over the British Isles

✍ Scribed by H. L. Penman

Publisher
John Wiley and Sons
Year
1950
Tongue
English
Weight
739 KB
Volume
76
Category
Article
ISSN
0035-9009

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✦ Synopsis

Abstract

Theoretical values of average annual evaporation from the British Isles are calculated from long‐term averages of air temperature, duration of sunshine, vapour pressure and wind speed for about 100 stations. Direct estimates of the same quantity are obtained from long‐term averages of annual rainfall and annual run‐off from about 40 catchment areas. The two kinds of estimate agree and are plotted on a map to show the geographical variation of evaporation. This shows an increase from 14 in. per annum in Scotland to 20 in. along the south coast.

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## Abstract Evaporation measurements made at 16 sites in the British Isles were analysed for evidence of long‐term changes. Half of the series were from sites in Ireland measured with Class A evaporation pans between 1963 and 2005 and half in England and Scotland measured with the British Meteorolo