Nitrous oxide emissions from a municipal landfill.
The first measurements of nitrous oxide (N20) emissions from a landfill by the eddy covariance method are reported. These measurements were compared to enclosure emission measurements conducted at the same site. The average emissions from the municipal landfill of the Helsinki Metropolitan Area were 2.7 mg N m(-2) h(-1) and 6.0 mg N m(-2) h(-1) measured bythe eddy covariance and the enclosure methods, respectively. The N20 emissions from the landfill are about 1 order of magnitude higher than the highest emissions reported from Northern European agricultural soils, and 2 orders of magnitude higher than the highest emissions reported from boreal forest soils. Due to the small area of landfills as compared to other land-use classes, the total N20 emissions from landfills are estimated to be of minor importance for the total emissions from Finland. Expressed as a greenhouse warming potential (GWP100), the N2O emissions make up about 3% of the total GWP100 emission of the landfill. The emissions measured by the two systems were generally of similar magnitude, with enclosure measurements showing a high small-scale spatial variation.
Rinne
Janne
J
Department of Physical Sciences, P.O.B. 68, FI-00014 University of Helsinki, Finland. janne.rinne@helsinki.fi
Pihlatie
Mari
M
Lohila
Annalea
A
Thum
Tea
T
Aurela
Mika
M
Tuovinen
Juha-Pekka
JP
Laurila
Tuomas
T
Vesala
Timo
T
D000393:Air Pollutants / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods / Q000706:statistics & numerical data*; D005387:Finland; D017752:Greenhouse Effect; D009609:Nitrous Oxide / Q000032:analysis*; D012037:Refuse Disposal; D014919:Wind
D000393:Air Pollutants; D009609:Nitrous Oxide