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Doctoral thesis
Open access
English

Oxic Methane Production Dynamics in Lakes

Number of pages169
Imprimatur date2022-05-30
Defense date2022-05-20
Abstract

Several studies have shown that different organisms are able to produce methane (CH4) in oxic conditions, however the contribution of oxic methane production (OMP) to CH4 emissions from lakes versus the CH4 produced in anoxic sediment has been hotly debated. This doctoral thesis studied the net production rate (Pnet) over five lakes and in different time scales. Pnet rates were defined as the balance between OMP (adds CH4) and CH4 oxidation (removes CH4) in the lake surface mixed layer. Using modelling approaches, it was shown that OMP could contribute up to 90% percent of the CH4 emissions, but it depends on the lake and time period analyzed. Diurnal cycles of Pnet rates and empirical correlations suggest phytoplankton could play an important role on OMP. The insights of the thesis contributed to predict of CH4 emissions from lakes and it helps to understand the role of lakes on global methane budget.

eng
Keywords
  • Lake
  • Methane
  • Methane emissions
  • Oxic methane production
  • Modelling
  • Methane lake budget
  • Physical limnology
  • Gas transport
  • Mass balance
Research group
Citation (ISO format)
ORDONEZ VALDEBENITO, Cesar Fernando. Oxic Methane Production Dynamics in Lakes. 2022. doi: 10.13097/archive-ouverte/unige:162115
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Creation07/14/2022 10:29:00 AM
First validation07/14/2022 10:29:00 AM
Update time03/14/2024 8:57:14 AM
Status update03/14/2024 8:57:14 AM
Last indexation05/06/2024 11:12:34 AM
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