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Water Balance of Britain, 50,000 yr B.P. to the Present Day

Published online by Cambridge University Press:  20 January 2017

John G. Lockwood
John G. Lockwood*
Affiliation:
School of Geography, University of Leeds, Leeds LS2 9JT, United Kingdom
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Abstract

Estimates made of lowland precipitation and evaporation in Britain during the last (Devensian) glaciation suggest that during the cold periods of the Devensian precipitation was probably low, between 260 and 370 mm/thermal maximum of the Upton Warren Interstadial lowland precipitation was probably in the range 450 to 650 mm/year. Two summer precipitation regimes are identified during the cold periods, one with high values and the other with low. The high summer precipitation variant leads to moist conditions with July and August precipitation values similar to those at the present day, and global circulation models suggest that the moist regime may have existed at the time of the maximum advance of the ice sheets. On the other hand, the low summer precipitation variant leads to a dry summer with wind action creating aeolian deposits, and this variant probably existed at earlier times in the glacial period. About 6500 yr B.P., in the Atlantic period, forest conditions probably caused increased evaporation which more than compensated for the increased precipitation of the time, causing low runoff conditions. The clearance of British forests by man since 6500 yr B.P. has probably led to an absolute increase in runoff values even though precipitation values have fallen.

Type
Research Article
Information
Quaternary Research , Volume 12 , Issue 3 , November 1979 , pp. 297 - 310
Copyright
University of Washington

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