Process Modeling of Global Soil Nitrous Oxide Emissions
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MITJPSPGC_Rpt206.pdf
Description
Main article
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11.49 MB
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Author(s)
Saikawa, E.
Schlosser, C.A.
Prinn, R.G.
Date Issued
September 1, 2011
Publisher
MIT Joint Program on the Science and Policy of Global Change
Citation
Report no. 206
Series/Report no.
Joint Program Report Series;206
Abstract
Nitrous oxide is an important greenhouse gas and is a major ozone-depleting substance. To understand and
quantify soil nitrous oxide emissions, we expanded the Community Land Model with prognostic Carbon
and Nitrogen (CLM-CN) by inserting a module to estimate annually- and seasonally-varying nitrous oxide
emissions between 1978 and 2000. We evaluate our soil N2O emission estimates against existing emissions
inventories, other process-based model estimates, and observations from two forest sites in the Amazon
and one in the United States. The model reproduces soil temperature and soil moisture relatively well,
and it reconfirms the important relationship between N2O emissions and these parameters. The model also
reproduces observations of N2O emissions well in the Amazonian forests but not during the winter in the
USA. Applying this model to estimate the past 23 years of global soil N2O emissions, we find that there
is a significant decrease in soil N2O emissions associated with drought and El Ni˜no years. More study is
necessary to quantify the high-latitude winter activity in the model in order to better understand the impact
of future climate on N2O emissions and vice versa.
Description
http://globalchange.mit.edu/research/publications/2213
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