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Quantifying nitrous oxide emissions in the U.S. Midwest – A top-down study

Eckl, Maximilian and Roiger, Anke and Kostinek, Julian and Fiehn, Alina and Huntrieser, Heidi and Knote, Christoph and Barkley, Zachary R. and Ogle, S. and Baier, Bianca C. and Sweeney, Colm and Davis, Kenneth J. (2020) Quantifying nitrous oxide emissions in the U.S. Midwest – A top-down study. In: Earth and Space Science Open Archive. AGU 2020 Fall Meeting, 01.-17. Dez. 2020, online. doi: 10.1002/essoar.10505820.1.

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Nitrous oxide (N2O), a potent greenhouse gas and ozone depleting substance, plays a crucial role in the atmosphere. Anthropogenic emissions from agriculture contribute to a rising trend in global N2O emissions and atmospheric concentrations. However, due to insufficient direct observations, regional N2O emissions derived in bottom-up and top-down studies are highly uncertain. The U.S. Midwest is one of the most intensive agriculture areas worldwide and hence may contribute significantly to the observed trend. Recent top-down studies suggest that bottom-up estimates underestimate agricultural emissions in that area by up to an order of magnitude. Here we quantify nitrous oxide emissions in the Midwest in October 2017 and June-July 2019 with a top-down approach. Unique continuous aircraft-based measurements of N2O conducted during the ACT-America campaign together with forward WRF-Chem model simulations are used to scale the EDGAR inventory thus quantifying emissions. On average we had to upscale October 2017 and June-July 2019 agricultural EDGAR 4.3.2/5.0 emissions by a factor of 6.3/3.5 and 11.4/9.9, resulting in 0.42 nmol m-2 s-1 and 1.06 nmol m-2 s-1 emissions in the Midwest, respectively. Finally, calculations of direct soil N2O emissions from the DayCent biogeochemical model are compared to our estimates.

Item URL in elib:https://elib.dlr.de/146147/
Document Type:Conference or Workshop Item (Speech)
Title:Quantifying nitrous oxide emissions in the U.S. Midwest – A top-down study
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Eckl, MaximilianDLR, IPAhttps://orcid.org/0000-0001-5876-7392UNSPECIFIED
Fiehn, AlinaDLR, IPAhttps://orcid.org/0000-0003-3376-4405UNSPECIFIED
Huntrieser, HeidiDLR, IPAhttps://orcid.org/0000-0001-8046-1859UNSPECIFIED
Knote, ChristophMIM, Univ. Münchenhttps://orcid.org/0000-0001-9105-9179UNSPECIFIED
Barkley, Zachary R.The Pennsylvania State Universityhttps://orcid.org/0000-0002-1731-4685UNSPECIFIED
Ogle, S.Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO 80523, USAUNSPECIFIEDUNSPECIFIED
Baier, Bianca C.Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USAhttps://orcid.org/0000-0003-0379-9180UNSPECIFIED
Sweeney, ColmNOAA Global Monitoring Laboratory, Boulder, CO, USAUNSPECIFIEDUNSPECIFIED
Davis, Kenneth J.Pennsylvania State Univ., University Park, VA, USAhttps://orcid.org/0000-0002-1992-8381UNSPECIFIED
Date:11 December 2020
Journal or Publication Title:Earth and Space Science Open Archive
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:nitrous oxide, agricultural emissions, airborne measurements, top-down study, greenhouse gas
Event Title:AGU 2020 Fall Meeting
Event Location:online
Event Type:international Conference
Event Dates:01.-17. Dez. 2020
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Air Transportation and Impact
DLR - Research area:Aeronautics
DLR - Program:L AI - Air Transportation and Impact
DLR - Research theme (Project):L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Eckl, Maximilian
Deposited On:25 Nov 2021 08:00
Last Modified:25 Nov 2021 08:00

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