NOx descent in the Arctic middle atmosphere in early 2009

C. E. Randall; V. L. Harvey; D. E. Siskind; J. France; P. F. Bernath; C. D. Boone; K. A. Walker

doi:10.1029/2009GL039706

NOx descent in the Arctic middle atmosphere in early 2009

C. E. Randall, V. L. Harvey, D. E. Siskind, J. France, P. F. Bernath, C. D. Boone, K. A. Walker

Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

Measurements by the Atmospheric Chemistry Experiment show that the amount of NOx (NO + NO2) produced by energetic particle precipitation (EPP) that descended from the Arctic mesosphere and lower thermosphere into the stratosphere in early 2009 was up to similar to 50 times higher than average in 2005, 2007 and 2008. This is of note because the level of EPP in the preceding months was very low, suggesting that excess production of NOx was not the cause of the enhancements. Rather, the enhancements are attributed to unusually strong descent in the middle atmosphere. This is the third time on record that extraordinary meteorology contributed to descent of excess NOx. The results confirm that EPP impacts on the middle atmosphere can be large even in the absence of exceptional EPP, and highlight the need to continually measure NOx throughout the polar region from the stratosphere to the lower thermosphere. Citation: Randall, C. E., V. L. Harvey, D. E. Siskind, J. France, P. F. Bernath, C. D. Boone, and K. A. Walker (2009), NOx descent in the Arctic middle atmosphere in early 2009, Geophys. Res. Lett., 36, L18811, doi: 10.1029/2009GL039706.

Original language	English
Article number	L18811
Pages (from-to)	1-4
Number of pages	4
Journal	Geophysical Research Letters
Volume	36
Issue number	18
DOIs	https://doi.org/10.1029/2009GL039706
Publication status	Published - 25 Sept 2009

Keywords

ENHANCEMENTS
TEMPERATURE
VORTEX

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http://onlinelibrary.wiley.com/doi/10.1029/2009GL039706/abstract

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title = "NOx descent in the Arctic middle atmosphere in early 2009",

abstract = "Measurements by the Atmospheric Chemistry Experiment show that the amount of NOx (NO + NO2) produced by energetic particle precipitation (EPP) that descended from the Arctic mesosphere and lower thermosphere into the stratosphere in early 2009 was up to similar to 50 times higher than average in 2005, 2007 and 2008. This is of note because the level of EPP in the preceding months was very low, suggesting that excess production of NOx was not the cause of the enhancements. Rather, the enhancements are attributed to unusually strong descent in the middle atmosphere. This is the third time on record that extraordinary meteorology contributed to descent of excess NOx. The results confirm that EPP impacts on the middle atmosphere can be large even in the absence of exceptional EPP, and highlight the need to continually measure NOx throughout the polar region from the stratosphere to the lower thermosphere. Citation: Randall, C. E., V. L. Harvey, D. E. Siskind, J. France, P. F. Bernath, C. D. Boone, and K. A. Walker (2009), NOx descent in the Arctic middle atmosphere in early 2009, Geophys. Res. Lett., 36, L18811, doi: 10.1029/2009GL039706.",

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AU - Randall, C. E.

AU - Harvey, V. L.

AU - Siskind, D. E.

AU - France, J.

AU - Bernath, P. F.

AU - Boone, C. D.

AU - Walker, K. A.

PY - 2009/9/25

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N2 - Measurements by the Atmospheric Chemistry Experiment show that the amount of NOx (NO + NO2) produced by energetic particle precipitation (EPP) that descended from the Arctic mesosphere and lower thermosphere into the stratosphere in early 2009 was up to similar to 50 times higher than average in 2005, 2007 and 2008. This is of note because the level of EPP in the preceding months was very low, suggesting that excess production of NOx was not the cause of the enhancements. Rather, the enhancements are attributed to unusually strong descent in the middle atmosphere. This is the third time on record that extraordinary meteorology contributed to descent of excess NOx. The results confirm that EPP impacts on the middle atmosphere can be large even in the absence of exceptional EPP, and highlight the need to continually measure NOx throughout the polar region from the stratosphere to the lower thermosphere. Citation: Randall, C. E., V. L. Harvey, D. E. Siskind, J. France, P. F. Bernath, C. D. Boone, and K. A. Walker (2009), NOx descent in the Arctic middle atmosphere in early 2009, Geophys. Res. Lett., 36, L18811, doi: 10.1029/2009GL039706.

AB - Measurements by the Atmospheric Chemistry Experiment show that the amount of NOx (NO + NO2) produced by energetic particle precipitation (EPP) that descended from the Arctic mesosphere and lower thermosphere into the stratosphere in early 2009 was up to similar to 50 times higher than average in 2005, 2007 and 2008. This is of note because the level of EPP in the preceding months was very low, suggesting that excess production of NOx was not the cause of the enhancements. Rather, the enhancements are attributed to unusually strong descent in the middle atmosphere. This is the third time on record that extraordinary meteorology contributed to descent of excess NOx. The results confirm that EPP impacts on the middle atmosphere can be large even in the absence of exceptional EPP, and highlight the need to continually measure NOx throughout the polar region from the stratosphere to the lower thermosphere. Citation: Randall, C. E., V. L. Harvey, D. E. Siskind, J. France, P. F. Bernath, C. D. Boone, and K. A. Walker (2009), NOx descent in the Arctic middle atmosphere in early 2009, Geophys. Res. Lett., 36, L18811, doi: 10.1029/2009GL039706.

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NOx descent in the Arctic middle atmosphere in early 2009

Abstract

Keywords

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