Odin stratospheric proxy NO<sub>y</sub> measurements and climatology
Five years of OSIRIS (Optical Spectrograph and InfraRed Imager System) NO<sub>2</sub> and SMR (Sub-millimetre and Millimetre Radiometer) HNO<sub>3</sub> observations from the Odin satellite, combined with data from a photochemical box model, have been used to construct a stra...
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doaj-a6356cc98b79498fbd176929e2cd0a162020-11-25T00:09:17ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242008-10-0181957315754Odin stratospheric proxy NO<sub>y</sub> measurements and climatologyD. MurtaghA. I. JonssonC. S. HaleyJ. UrbanC. A. McLindenS. BrohedeFive years of OSIRIS (Optical Spectrograph and InfraRed Imager System) NO<sub>2</sub> and SMR (Sub-millimetre and Millimetre Radiometer) HNO<sub>3</sub> observations from the Odin satellite, combined with data from a photochemical box model, have been used to construct a stratospheric proxy NO<sub>y</sub> data set including the gases: NO, NO<sub>2</sub>, HNO<sub>3</sub>, 2×N<sub>2</sub>O<sub>5</sub> and ClONO<sub>2</sub>. This Odin NO<sub>y</sub> climatology is based on all daytime measurements and contains monthly mean and standard deviation, expressed as mixing ratio or number density, as function of latitude or equivalent latitude (5° bins) on 17 vertical layers (altitude, pressure or potential temperature) between 14 and 46 km. Comparisons with coincident NO<sub>y</sub> profiles from the Atmospheric Chemistry Experiment-Fourier Transform Spectrometer (ACE-FTS) instrument were used to evaluate several methods to combine Odin observations with model data. This comparison indicates that the most appropriate merging technique uses OSIRIS measurements of NO<sub>2</sub>, scaled with model NO/NO<sub>2</sub> ratios, to estimate NO. The sum of 2×N<sub>2</sub>O<sub>5</sub> and ClONO<sub>2</sub> is estimated from uncertainty-based weighted averages of scaled observations of SMR HNO<sub>3</sub> and OSIRIS NO<sub>2</sub>. Comparisons with ACE-FTS suggest the precision (random error) and accuracy (systematic error) of Odin NO<sub>y</sub> profiles are about 15% and 20%, respectively. Further comparisons between Odin and the Canadian Middle Atmosphere Model (CMAM) show agreement to within 20% and 2 ppb throughout most of the stratosphere except in the polar vortices. The combination of good temporal and spatial coverage, a relatively long data record, and good accuracy and precision make this a valuable NO<sub>y</sub> product for various atmospheric studies and model assessments. http://www.atmos-chem-phys.net/8/5731/2008/acp-8-5731-2008.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
D. Murtagh A. I. Jonsson C. S. Haley J. Urban C. A. McLinden S. Brohede |
spellingShingle |
D. Murtagh A. I. Jonsson C. S. Haley J. Urban C. A. McLinden S. Brohede Odin stratospheric proxy NO<sub>y</sub> measurements and climatology Atmospheric Chemistry and Physics |
author_facet |
D. Murtagh A. I. Jonsson C. S. Haley J. Urban C. A. McLinden S. Brohede |
author_sort |
D. Murtagh |
title |
Odin stratospheric proxy NO<sub>y</sub> measurements and climatology |
title_short |
Odin stratospheric proxy NO<sub>y</sub> measurements and climatology |
title_full |
Odin stratospheric proxy NO<sub>y</sub> measurements and climatology |
title_fullStr |
Odin stratospheric proxy NO<sub>y</sub> measurements and climatology |
title_full_unstemmed |
Odin stratospheric proxy NO<sub>y</sub> measurements and climatology |
title_sort |
odin stratospheric proxy no<sub>y</sub> measurements and climatology |
publisher |
Copernicus Publications |
series |
Atmospheric Chemistry and Physics |
issn |
1680-7316 1680-7324 |
publishDate |
2008-10-01 |
description |
Five years of OSIRIS (Optical Spectrograph and InfraRed Imager System) NO<sub>2</sub> and SMR (Sub-millimetre and Millimetre Radiometer) HNO<sub>3</sub> observations from the Odin satellite, combined with data from a photochemical box model, have been used to construct a stratospheric proxy NO<sub>y</sub> data set including the gases: NO, NO<sub>2</sub>, HNO<sub>3</sub>, 2×N<sub>2</sub>O<sub>5</sub> and ClONO<sub>2</sub>. This Odin NO<sub>y</sub> climatology is based on all daytime measurements and contains monthly mean and standard deviation, expressed as mixing ratio or number density, as function of latitude or equivalent latitude (5° bins) on 17 vertical layers (altitude, pressure or potential temperature) between 14 and 46 km. Comparisons with coincident NO<sub>y</sub> profiles from the Atmospheric Chemistry Experiment-Fourier Transform Spectrometer (ACE-FTS) instrument were used to evaluate several methods to combine Odin observations with model data. This comparison indicates that the most appropriate merging technique uses OSIRIS measurements of NO<sub>2</sub>, scaled with model NO/NO<sub>2</sub> ratios, to estimate NO. The sum of 2×N<sub>2</sub>O<sub>5</sub> and ClONO<sub>2</sub> is estimated from uncertainty-based weighted averages of scaled observations of SMR HNO<sub>3</sub> and OSIRIS NO<sub>2</sub>. Comparisons with ACE-FTS suggest the precision (random error) and accuracy (systematic error) of Odin NO<sub>y</sub> profiles are about 15% and 20%, respectively. Further comparisons between Odin and the Canadian Middle Atmosphere Model (CMAM) show agreement to within 20% and 2 ppb throughout most of the stratosphere except in the polar vortices. The combination of good temporal and spatial coverage, a relatively long data record, and good accuracy and precision make this a valuable NO<sub>y</sub> product for various atmospheric studies and model assessments. |
url |
http://www.atmos-chem-phys.net/8/5731/2008/acp-8-5731-2008.pdf |
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