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Variability of dissolved CO2 in the Pang and Lambourn Chalk rivers.

Research output: Contribution to journalJournal article

Published

Journal publication date17/01/2007
JournalHydrology and Earth System Sciences and Discussions
Journal number1
Volume11
Number of pages12
Pages328-339
Original languageEnglish

Abstract

This paper presents the results of a two-year field campaign to determine the spatial and temporal variability of groundwater interaction with surface waters in two Cretaceous Chalk catchments (the Pang and Lambourn) in the Upper Thames in Berkshire, UK, based on measurement of dissolved carbon dioxide (CO2). Average stream water concentrations of dissolved CO2 were up to 35 times the concentration at atmospheric equilibrium. Mean groundwater concentrations of 85 and 70 times the atmospheric equilibrium were determined from borehole water sampled in the Pang and Lambourn respectively. Diurnal and seasonal variation of in-stream concentration of dissolved CO2 is not significant enough to mask the signal from groundwater inputs.