Global evaluation of ammonia bidirectional exchange and livestock diurnal variation schemes

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

doi:10.5194/acp-15-12823-2015

Articles | Volume 15, issue 22

https://doi.org/10.5194/acp-15-12823-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/acp-15-12823-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 15, issue 22

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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Aug 2024	32	6	3	41
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Jan 2025	29	13	1	43
Feb 2025	48	17	4	69
Mar 2025	42	22	1	65
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May 2025	42	12	1	55
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Cumulative views and downloads (calculated since 20 Feb 2015)

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Mar 2015	40	26	2	68
Apr 2015	24	18	1	43
May 2015	30	19	4	53
Jun 2015	14	9	5	28
Jul 2015	17	13	1	31
Aug 2015	17	12	3	32
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Oct 2015	14	7	0	21
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Latest update: 18 Nov 2025

Short summary

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.