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Bias in ammonia emission inventory and implications on emission control of nitrogen oxides over North China Plain
https://orcid.org/0000-0002-5547-0849
https://orcid.org/0000-0003-4658-0760
Abstract This study examined seasonal bias of ammonia (NH3) emission inventory over North China Plain (NCP) using the GEOS-Chem chemical transport model (NH3-standard simulation, SG1), and found that the MIX NH3 inventory overestimates winter NH3 by 31% and underestimates summer NH3 by 50%. NH3 emission from NCP is thus cut by 24% in winter and doubled in summer (NH3-corrected simulation, SG2) to match up with the observations. The corrected NH3 emission changes the surface PM2.5 and nitrate concentrations and is expected to impact the nitrogen oxides (NOx) emission control efficiency (relative changes of PM2.5 and nitrate concentration in response to 1% NOx emission change, βPM and βNO3). We then conducted sensitivity studies (SG3) by reducing 20% (S31) and 40% (S32) NOx emission based on NH3-standard and NH3-corrected simulation, respectively. Through comparing the NOx emission control efficiency under the two NH3 emission conditions (NH3-standard and NH3-corrected), we find that NH3 emission bias under the NH3-standard condition causes ~30% overprediction of winter βPM and ~35% underprediction of summer βPM. In addition, for the NH3-corrected simulation, βPM increases by 43% in winter and 7.7% in summer from S31 to S32. Taken together, these findings highlighted the importance of stringent NOx emission control throughout the year and NH3 emission control in summer as well. Moreover, it is critical to obtain a more accurate seasonal pattern of NH3 emission inventory in assessing emission control efficiency of PM2.5 precursors.
Graphical abstract Display Omitted
Highlights Surface and satellite NH3 observations were used to validate model in North China Plain. Current MIX NH3 inventory has bias of 31% and −50% in winter and summer, respectively. Winter NOx emission control efficiency increases by 43% as cut of NOx doubles. NH3 emission bias leads to βPM bias of +30% in winter and −35% in summer. Refined NH3 emission seasonality and stricter NOX emission control are recommended.
Bias in ammonia emission inventory and implications on emission control of nitrogen oxides over North China Plain
https://orcid.org/0000-0002-5547-0849
https://orcid.org/0000-0003-4658-0760
Abstract This study examined seasonal bias of ammonia (NH3) emission inventory over North China Plain (NCP) using the GEOS-Chem chemical transport model (NH3-standard simulation, SG1), and found that the MIX NH3 inventory overestimates winter NH3 by 31% and underestimates summer NH3 by 50%. NH3 emission from NCP is thus cut by 24% in winter and doubled in summer (NH3-corrected simulation, SG2) to match up with the observations. The corrected NH3 emission changes the surface PM2.5 and nitrate concentrations and is expected to impact the nitrogen oxides (NOx) emission control efficiency (relative changes of PM2.5 and nitrate concentration in response to 1% NOx emission change, βPM and βNO3). We then conducted sensitivity studies (SG3) by reducing 20% (S31) and 40% (S32) NOx emission based on NH3-standard and NH3-corrected simulation, respectively. Through comparing the NOx emission control efficiency under the two NH3 emission conditions (NH3-standard and NH3-corrected), we find that NH3 emission bias under the NH3-standard condition causes ~30% overprediction of winter βPM and ~35% underprediction of summer βPM. In addition, for the NH3-corrected simulation, βPM increases by 43% in winter and 7.7% in summer from S31 to S32. Taken together, these findings highlighted the importance of stringent NOx emission control throughout the year and NH3 emission control in summer as well. Moreover, it is critical to obtain a more accurate seasonal pattern of NH3 emission inventory in assessing emission control efficiency of PM2.5 precursors.
Graphical abstract Display Omitted
Highlights Surface and satellite NH3 observations were used to validate model in North China Plain. Current MIX NH3 inventory has bias of 31% and −50% in winter and summer, respectively. Winter NOx emission control efficiency increases by 43% as cut of NOx doubles. NH3 emission bias leads to βPM bias of +30% in winter and −35% in summer. Refined NH3 emission seasonality and stricter NOX emission control are recommended.
Bias in ammonia emission inventory and implications on emission control of nitrogen oxides over North China Plain
https://orcid.org/0000-0002-5547-0849
https://orcid.org/0000-0003-4658-0760
Abstract This study examined seasonal bias of ammonia (NH3) emission inventory over North China Plain (NCP) using the GEOS-Chem chemical transport model (NH3-standard simulation, SG1), and found that the MIX NH3 inventory overestimates winter NH3 by 31% and underestimates summer NH3 by 50%. NH3 emission from NCP is thus cut by 24% in winter and doubled in summer (NH3-corrected simulation, SG2) to match up with the observations. The corrected NH3 emission changes the surface PM2.5 and nitrate concentrations and is expected to impact the nitrogen oxides (NOx) emission control efficiency (relative changes of PM2.5 and nitrate concentration in response to 1% NOx emission change, βPM and βNO3). We then conducted sensitivity studies (SG3) by reducing 20% (S31) and 40% (S32) NOx emission based on NH3-standard and NH3-corrected simulation, respectively. Through comparing the NOx emission control efficiency under the two NH3 emission conditions (NH3-standard and NH3-corrected), we find that NH3 emission bias under the NH3-standard condition causes ~30% overprediction of winter βPM and ~35% underprediction of summer βPM. In addition, for the NH3-corrected simulation, βPM increases by 43% in winter and 7.7% in summer from S31 to S32. Taken together, these findings highlighted the importance of stringent NOx emission control throughout the year and NH3 emission control in summer as well. Moreover, it is critical to obtain a more accurate seasonal pattern of NH3 emission inventory in assessing emission control efficiency of PM2.5 precursors.
Graphical abstract Display Omitted
Highlights Surface and satellite NH3 observations were used to validate model in North China Plain. Current MIX NH3 inventory has bias of 31% and −50% in winter and summer, respectively. Winter NOx emission control efficiency increases by 43% as cut of NOx doubles. NH3 emission bias leads to βPM bias of +30% in winter and −35% in summer. Refined NH3 emission seasonality and stricter NOX emission control are recommended.
Bias in ammonia emission inventory and implications on emission control of nitrogen oxides over North China Plain
Zhang, Qianqian (author) / Pan, Yuepeng (author) / He, Yuexin (author) / Zhao, Yuanghong (author) / Zhu, Liye (author) / Zhang, Xingying (author) / Xu, Xiaojuan (author) / Ji, Dongsheng (author) / Gao, Jian (author) / Tian, Shili (author)
Atmospheric Environment ; 214
2019-07-28
Article (Journal)
Electronic Resource
English
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