, Volume 49, Issue 1, pp 1–19 | Cite as

Fluxes of methane and carbon dioxide from a small productive lake to the atmosphere

  • Peter Casper
  • Stephen C. Maberly
  • Grahame H. Hall
  • Bland J. Finlay


The fluxes of CH4 and CO2 to the atmosphere, and the relative contributions of ebullition and molecular diffusion, were determined for a small hypertrophic freshwater lake (Priest Pot, UK) over the period May to October 1997. The average total flux of CH4 and CO2 (estimated from 7 sites on the lake) was approximately 52 mmol m−2 d−1 and was apportioned 12 and 40 mmol m−2 d−1 toCH4 and CO2 respectively. Diffusion across the air-water interface accounted for the loss of 0.4and 40 mmol m−2 d−1 of CH4 and CO2 respectively whilst the corresponding figures for ebullition losses were 12.0 (CH4) and 0.23 (CO2) mmol m−2 d−1. Most CH4 (96%) was lost by ebullition, and most CO2 (99%) by diffusive processes. The ebullition of gas, measured at weekly intervals along a transect of the lake, showed high spatial and temporal variation. The CH4 content of the trapped gas varied between 44 and 88% (by volume) and was highest at the deepest points. Pulses of gas ebullition were detected during periods of rapidly falling barometric pressure. Therelevance of the measurements to global estimates ofcarbon emission from freshwaters are discussed.

carbon dioxide diffusion ebullition emission freshwater hypertrophic lakes methane 


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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Peter Casper
    • 1
  • Stephen C. Maberly
    • 2
  • Grahame H. Hall
    • 2
  • Bland J. Finlay
    • 2
  1. 1.Department of Limnology of Stratified LakesInstitute of Freshwater Ecology and Inland FisheriesNeuglobsowGermany
  2. 2.Windermere LaboratoryInstitute of Freshwater EcologyFar Sawrey, CumbriaU.K.

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