Articles | Volume 20, issue 20
Research article
23 Oct 2020
Research article |  | 23 Oct 2020

Northwestward cropland expansion and growing urea-based fertilizer use enhanced NH3 emission loss in the contiguous United States

Peiyu Cao, Chaoqun Lu, Jien Zhang, and Avani Khadilkar


Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision
AR by Peiyu Cao on behalf of the Authors (10 Aug 2020)  Author's response    Manuscript
ED: Referee Nomination & Report Request started (26 Aug 2020) by Jennifer G. Murphy
RR by Anonymous Referee #1 (10 Sep 2020)
ED: Publish subject to technical corrections (10 Sep 2020) by Jennifer G. Murphy
AR by Peiyu Cao on behalf of the Authors (16 Sep 2020)  Author's response    Manuscript
Short summary
In this study, we estimate monthly ammonia emission from synthetic nitrogen fertilizer use across the contiguous US from 1900 to 2015. The results indicate the important role that cropland expansion and nitrogen fertilizer enrichment played in enhancing NH3 emissions. It shows such long-term human activities have dramatically changed the spatiotemporal and seasonal patterns of NH3 emission, impacting air pollution and public health in the US.
Final-revised paper