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Sawamoto et al. 2005

Sawamoto, T., Nakajima, Y., Kasuya, M., Tsuruta, H. and Yagi, K. (2005). Evaluation of emission factors for indirect N₂O emission due to nitrogen leaching in agro-ecosystems. Geophysical Research Letters 32: doi: 10.1029/2004GL021625. issn: 0094-8276.

We reviewed the available data of NO3- and dissolved N2O concentration in leached water in agro-ecosystems from 11 published papers and four unpublished studies, to reevaluate the IPCC default emission factor (N2O-N/NO3--N) for indirect N2O emission in agro-ecosystems. The emission factor was estimated to be 0.0024, indicating that the IPCC's present emission factor (0.015) and estimate of indirect N2O emission are too high. Using the estimated value of 0.0024 as the emission factor revises the global indirect N2O emission from N leaching and runoff in agro-ecosystems downward from 1.6 to 0.80 Tg N y-1 and the sum of direct and indirect global N2O emission due to agriculture from 6.3 to 5.5 Tg N y-1.

BACKGROUND DATA FILES

	Abstract

Keywords
Biogeosciences, Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912), Biogeosciences, Trace gases, Global Change, Atmosphere (0315, 0325), Hydrology, Groundwater hydrology, Hydrology, Groundwater quality

Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/

Publisher
American Geophysical Union
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