Methane as a greenhouse gas and food web fuel in some boreal lakes

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Main results and conclusions • Areal CH 4 effluxes from the vegetated littoral zone are larger than from the pelagic area of the boreal lakes - The highest CH 4 effluxes are released from emergent vegetation stands of eutrophied lakes - Pelagic CH 4 effluxes are inversely related to the size of the lake • In the pelagic area 80-90% of the CH 4 loss is due to oxidation in the water column • In small, stratified, boreal lakes (area
Aknowledgements University of Helsinki: Jussi Huotari, Tiina Käki, Anne Ojala, Jessica Linnaluoma, Tiina Tulonen, Elina Peltomaa, Lotta Lehtinen, Lauri Arvola University of Jyväskylä: Roger Jones, Sami Taipale, Hannu Nykänen, Marja Tiirola Finnish Environment Institute: Irina Bergström, Pirkko Kortelainen, Miitta Rantakari
Page 1 and 2: Methane as a greenhouse gas and foo
Page 3 and 4: Littoral CH 4 emissions were studie
Page 5 and 6: …or sampling in a boat
Page 7 and 8: Gas samples were analysed with gas
Page 9 and 10: 1500 1000 1997 1500 1000 1998 1500
Page 11 and 12: CH 4 emissions of vegetated littora
Page 13 and 14: The highest CH 4 concentrations are
Page 15 and 16: CH 4 efflux from the pelagic area o
Page 17 and 18: Mekkojärvi 2005 CH 4 efflux or MOB
Page 19 and 20: Mekkojärvi study in 2005, the diet
Page 21: Two-isotope IsoSource model results

Methane as a greenhouse gas and food web fuel in some boreal lakes

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