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Need for Improved Monitoring of Spatial and Temporal Trends of Reduced Nitrogen
Citation:
Puchalski, M., J. Walker, G. Beachley, M. Zondlo, K. Benedict, R. Grant, B. Schichtel, C. Rogers, A. Leytem, J. Rice, K. Morris, J. Schauer, AND R. Wang. Need for Improved Monitoring of Spatial and Temporal Trends of Reduced Nitrogen. ENVIRONMENTAL MANAGEMENT. Springer-Verlag, New York, NY, , 0, (2019).
Impact/Purpose:
Ambient NH4+ has been monitored for more than 30 years by existing networks, but less information exists for gaseous NH3. Over the last decade, ground-based monitoring and remote sensing have shown NH3 to be increasing in some regions of the U.S. yet uncertainties in emission inventories and gaps in monitoring make linking long-term trends in NH3 emissions with ambient NHx difficult. Expanded monitoring of NHx is needed in the U.S. to better characterize these linkages and provide data to evaluate and improve chemical transport models (CTMs) to more accurately predict PM formation, visibility impacts, and ecosystem exposure. Better understanding of spatial variability of NH3 concentrations and bidirectional exchange is also needed to improve the representation of NH3 in measurement model fusion techniques for total deposition.
Description:
This paper reviews the state of monitoring of NHx (NH3 + NH4+) in the U.S. and summarizes several needs and opportunities for expansion of existing networks to better inform trends and patterns of NHx concentrations and deposition.
