TY - JOUR
T1 - The effect of the novel HO2+NO-HNO3 reaction channel at South Pole, Antarctica
AU - Boxe, C. S.
AU - Hamer, P. D.
AU - Ford, W.
AU - Hoffmann, M.
AU - Shallcross, D. E.
N1 - Funding Information:
Paul Hamer was supported by an appointment to the NASA Postdoctoral Program at the Jet Propulsion Laboratory, administered by Oak Ridge Associated Universities through a contract with the National Aeronautics and Space Administration (NASA). The work described here was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contracts with NASA. The constructive comments of the reviewers are gratefully acknowledged.
Publisher Copyright:
© Antarctic Science Ltd 2012.
PY - 2012/8/1
Y1 - 2012/8/1
N2 - It is well established that the reaction of HO2 with NO plays a central role in atmospheric chemistry, by way of OH/HO2 recycling and reduction of ozone depletion by HOx cycles in the stratosphere and through ozone production in the troposphere. Utilizing a photochemical box model, we investigate the impact of the recently observed HNO3 production channel (HO2+NO→HNO3) on NOx (NO+NO2), HOx (OH1HO2), HNO3, and O3 concentrations in the boundary layer at the South Pole, Antarctica. Our simulations exemplify decreases in peak O3, NO, NO2, and OH and an increase in HNO3. Also, mean OH is in better agreement with observations, while worsening the agreement with O3, HO2, and HNO3 concentrations observed at the South Pole. The reduced concentrations of NOx are consistent with expected decreases in atmospheric NOx lifetime as a result of increased sequestration of NOx into HNO3. Although we show that the inclusion of the novel HNO3 production channel brings better agreement of OH with field measurements, the modelled ozone and HNO3 are worsened, and the changes in NOx lifetime imply that snowpack NOx emissions and snowpack nitrate recycling must be re-evaluated.
AB - It is well established that the reaction of HO2 with NO plays a central role in atmospheric chemistry, by way of OH/HO2 recycling and reduction of ozone depletion by HOx cycles in the stratosphere and through ozone production in the troposphere. Utilizing a photochemical box model, we investigate the impact of the recently observed HNO3 production channel (HO2+NO→HNO3) on NOx (NO+NO2), HOx (OH1HO2), HNO3, and O3 concentrations in the boundary layer at the South Pole, Antarctica. Our simulations exemplify decreases in peak O3, NO, NO2, and OH and an increase in HNO3. Also, mean OH is in better agreement with observations, while worsening the agreement with O3, HO2, and HNO3 concentrations observed at the South Pole. The reduced concentrations of NOx are consistent with expected decreases in atmospheric NOx lifetime as a result of increased sequestration of NOx into HNO3. Although we show that the inclusion of the novel HNO3 production channel brings better agreement of OH with field measurements, the modelled ozone and HNO3 are worsened, and the changes in NOx lifetime imply that snowpack NOx emissions and snowpack nitrate recycling must be re-evaluated.
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U2 - 10.1017/S0954102012000144
DO - 10.1017/S0954102012000144
M3 - Article
AN - SCOPUS:84896751966
VL - 24
SP - 417
EP - 425
JO - Antarctic Science
JF - Antarctic Science
SN - 0954-1020
IS - 4
ER -