TY - JOUR
AU - Cynthia Nevison
AU - Arlyn E Andrews
AU - Kirk Thoning
AU - Edward J Dlugokencky
AU - Colm Sweeney
AU - Scot M Miller
AU - Eri Saikawa
AU - Joshua Benmergui
AU - Marc L Fischer
AU - Marikate Mountain
AU - Thomas Nehrkorn
AB - <p>North American nitrous oxide (N<sub>2</sub>O) emissions of 1.6&nbsp;±&nbsp;0.3&nbsp;Tg&nbsp;N/yr over 2008–2014 are estimated using the CarbonTracker‐Lagrange regional inversion framework. The estimated N<sub>2</sub>O emissions are largely consistent with the EDGAR (Emission Database for Global Atmospheric Research) global inventory and with the results of global atmospheric inversions but offer more spatial and temporal detail over North America. Emissions are strongest from the Midwestern Corn/Soybean Belt, which accounts for nearly one third of the total North American N<sub>2</sub>O source. The emissions are maximum in spring/early summer, consistent with a nitrogen fertilizer‐driven source, and also show a late winter spike suggestive of freeze‐thaw effects. Interannual variability in emissions across the primary months of fertilizer application is positively correlated to mean precipitation. The estimated N<sub>2</sub>O flux from the Midwestern Corn/Soybean Belt and the more northerly United States/Canadian wheat belt corresponds to 4.2–4.6% and 2.2–3.0%, respectively, of total synthetic&nbsp;+&nbsp;organic N fertilizer applied to those regions. Consideration of nonagricultural sources and additional N inputs from soybean N<sub>2</sub> fixation could reduce the N<sub>2</sub>O yield from the Midwestern Corn/Soybean Belt to ~2.2–2.4% of total N inputs.</p>
BT - Global Biogeochemical Cycles
DA - 01/2018
DO - 10.1002/2017GB005759
IS - 3
LA - eng
N2 - <p>North American nitrous oxide (N<sub>2</sub>O) emissions of 1.6&nbsp;±&nbsp;0.3&nbsp;Tg&nbsp;N/yr over 2008–2014 are estimated using the CarbonTracker‐Lagrange regional inversion framework. The estimated N<sub>2</sub>O emissions are largely consistent with the EDGAR (Emission Database for Global Atmospheric Research) global inventory and with the results of global atmospheric inversions but offer more spatial and temporal detail over North America. Emissions are strongest from the Midwestern Corn/Soybean Belt, which accounts for nearly one third of the total North American N<sub>2</sub>O source. The emissions are maximum in spring/early summer, consistent with a nitrogen fertilizer‐driven source, and also show a late winter spike suggestive of freeze‐thaw effects. Interannual variability in emissions across the primary months of fertilizer application is positively correlated to mean precipitation. The estimated N<sub>2</sub>O flux from the Midwestern Corn/Soybean Belt and the more northerly United States/Canadian wheat belt corresponds to 4.2–4.6% and 2.2–3.0%, respectively, of total synthetic&nbsp;+&nbsp;organic N fertilizer applied to those regions. Consideration of nonagricultural sources and additional N inputs from soybean N<sub>2</sub> fixation could reduce the N<sub>2</sub>O yield from the Midwestern Corn/Soybean Belt to ~2.2–2.4% of total N inputs.</p>
PY - 2018
SP - 463 
EP -  485
ST - Global Biogeochem. Cycles
T2 - Global Biogeochemical Cycles
TI - Nitrous Oxide Emissions Estimated With the CarbonTracker-Lagrange North American Regional Inversion Framework
VL - 32
ER -