Improved estimates of ammonia emissions from global croplands

Zhan, Xiaoying; Adalibieke, Wulahati; Cui, Xiaoqing; Winiwarter, Wilfried; Reis, Stefan ORCID: https://orcid.org/0000-0003-2428-8320; Zhang, Lin; Bai, Zhaohai; Wang, Qihui; Huang, Weichen; Zhou, Feng. 2021 Improved estimates of ammonia emissions from global croplands. Environmental Science & Technology, 55 (2). 1329-1338. 10.1021/acs.est.0c05149

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Official URL: http://dx.doi.org/10.1021/acs.est.0c05149

Abstract/Summary

Reducing ammonia (NH3) volatilization from croplands while satisfying the food demand is strategically required to mitigate haze pollution. However, the global pattern of NH3 volatilization remains uncertain, primarily because of the episodic nature of NH3 volatilization rates and the high variation of fertilization practices. Here, we improve a global estimate of crop specific NH3 emissions at a high spatial resolution using an updated data-driven model with a survey-based dataset of the fertilization scheme. Our estimate of the globally averaged volatilization rate (12.6% ± 2.1%) is in line with previous data-driven studies (13.7 ± 3.1%) but results in one-quarter lower emissions than process-based models (16.5 ± 3.1%). The associated global emissions are estimated at 14.4 ± 2.3 Tg N, with more than 50% of the total stemming from three stable crops or 12.2% of global harvested areas. Nearly three-quarters of global cropland-NH3 emissions could be reduced by improving fertilization schemes (right rate, right type, and right placement). A small proportion (20%) of global harvested areas, primarily located in China, India, and Pakistan, accounts for 64% of abatement potentials. Our findings provide a critical reference guide for the future abatement strategy design when considering locations and crop types.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1021/acs.est.0c05149
UKCEH and CEH Sections/Science Areas:	Atmospheric Chemistry and Effects (Science Area 2017-)
ISSN:	0013-936X
Additional Keywords:	ammonia emission, croplands, global, abatement
NORA Subject Terms:	Ecology and Environment Atmospheric Sciences
Date made live:	31 Dec 2020 11:31 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/529313

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1021/acs.est.0c05149

UKCEH and CEH Sections/Science Areas:

Atmospheric Chemistry and Effects (Science Area 2017-)

ISSN:

0013-936X

Additional Keywords:

ammonia emission, croplands, global, abatement

NORA Subject Terms:

Ecology and Environment
Atmospheric Sciences