Articles | Volume 15, issue 22
https://doi.org/10.5194/acp-15-12823-2015
https://doi.org/10.5194/acp-15-12823-2015
Research article
 | 
19 Nov 2015
Research article |  | 19 Nov 2015

Global evaluation of ammonia bidirectional exchange and livestock diurnal variation schemes

L. Zhu, D. Henze, J. Bash, G.-R. Jeong, K. Cady-Pereira, M. Shephard, M. Luo, F. Paulot, and S. Capps

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Cited articles

Angima, S.: Measuring Soil pH, Oregon State University Small Farms Program, 2010.
Bash, J., Walker, J., Katul, G., Jones, M., Nemitz, E., and Robarge, W.: Estimation of in-canopy ammonia sources and sinks in a fertilized Zea Mays field, Environ. Sci. Technol, 44, 1683–1689, 2010.
Bash, J. O., Cooter, E. J., Dennis, R. L., Walker, J. T., and Pleim, J. E.: Evaluation of a regional air-quality model with bidirectional NH3 exchange coupled to an agroecosystem model, Biogeosciences, 10, 1635–1645, https://doi.org/10.5194/bg-10-1635-2013, 2013.
Bey, I., Jacob, D. J., Yantosca, R. M., Logan, J. A., Field, B. D., Fiore, A. M., Li, Q. B., Liu, H. G. Y., Mickley, L. J., and Schultz, M. G.: Global modeling of tropospheric chemistry with assimilated meteorology: Model description and evaluation, J. Geophys. Res.-Atmos., 106, 23073–23095, 2001.
Bouwman, A. F., Lee, D. S., Asman, W. A. H., Dentener, F. J., VanderHoek, K. W., and Olivier, J. G. J.: A global high-resolution emission inventory for ammonia, Global Biogeochem. Cy., 11, 561–587, 1997.
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We implement new diurnal variation scheme for ammonia livestock emissions and bidirectional exchange scheme and its adjoint in the GEOS-Chem global chemical transport model. Updated diurnal variability improves modeled-to-hourly in situ measurements comparison. The ammonium soil pool in the bidirectional exchange model largely extends the ammonia lifetime in the atmosphere. Large model biases remain as livestock emissions are still underestimated.
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