Using a photochemical model for the validation of NO<sub>2</sub> satellite measurements at different solar zenith angles

SCIAMACHY (Scanning Imaging Spectrometer for Atmospheric Chartography) aboard the recently launched Environmental Satellite (ENVISAT) of ESA is measuring solar radiance upwelling from the atmosphere and the extraterrestrial irradiance. Appropriate inversion of the ultraviolet and visible radiance me...

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Main Authors: A. Bracher, M. Sinnhuber, A. Rozanov, J. P. Burrows
Format: Article
Language:English
Published: Copernicus Publications 2005-01-01
Series:Atmospheric Chemistry and Physics
Online Access:http://www.atmos-chem-phys.net/5/393/2005/acp-5-393-2005.pdf
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spelling doaj-694be9ca7e13499e890e772deda2e1f92020-11-25T00:16:47ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242005-01-0152393408Using a photochemical model for the validation of NO<sub>2</sub> satellite measurements at different solar zenith anglesA. BracherM. SinnhuberA. RozanovJ. P. BurrowsSCIAMACHY (Scanning Imaging Spectrometer for Atmospheric Chartography) aboard the recently launched Environmental Satellite (ENVISAT) of ESA is measuring solar radiance upwelling from the atmosphere and the extraterrestrial irradiance. Appropriate inversion of the ultraviolet and visible radiance measurements, observed from the atmospheric limb, yields profiles of nitrogen dioxide, NO<sub>2</sub>, in the stratosphere (SCIAMACHY-IUP NO<sub>2</sub> profiles V1). In order to assess their accuracy, the resulting NO<sub>2</sub> profiles have been compared with those retrieved from the space borne occultation instruments Halogen Occultation Experiment (HALOE, data version v19) and Stratospheric Aerosol and Gas Experiment II (SAGE II, data version 6.2). As the HALOE and SAGE II measurements are performed during local sunrise or sunset and because NO<sub>2</sub> has a significant diurnal variability, the NO<sub>2</sub> profiles derived from HALOE and SAGE II have been transformed to those predicted for the solar zenith angles of the SCIAMACHY measurement by using a 1-dimensional photochemical model. The model used to facilitate the comparison of the NO<sub>2</sub> profiles from the different satellite sensors is described and a sensitivity ananlysis provided. Comparisons between NO<sub>2</sub> profiles from SCIAMACHY and those from HALOE NO<sub>2</sub> but transformed to the SCIAMACHY solar zenith angle, for collocations from July to October 2002, show good agreement (within +/-12%) between the altitude range from 22 to 33km. The results from the comparison of all collocated NO<sub>2</sub> profiles from SCIAMACHY and those from SAGE II transformed to the SCIAMACHY solar zenith angle show a systematic negative bias of 10 to 35% between 20km to 38km with a small standard deviation between 5 to 14%. These results agree with those of Newchurch and Ayoub (2004), implying that above 20km NO<sub>2</sub> profiles from SAGE II sunset are probably somewhat high.http://www.atmos-chem-phys.net/5/393/2005/acp-5-393-2005.pdf
collection DOAJ
language English
format Article
sources DOAJ
author A. Bracher
M. Sinnhuber
A. Rozanov
J. P. Burrows
spellingShingle A. Bracher
M. Sinnhuber
A. Rozanov
J. P. Burrows
Using a photochemical model for the validation of NO<sub>2</sub> satellite measurements at different solar zenith angles
Atmospheric Chemistry and Physics
author_facet A. Bracher
M. Sinnhuber
A. Rozanov
J. P. Burrows
author_sort A. Bracher
title Using a photochemical model for the validation of NO<sub>2</sub> satellite measurements at different solar zenith angles
title_short Using a photochemical model for the validation of NO<sub>2</sub> satellite measurements at different solar zenith angles
title_full Using a photochemical model for the validation of NO<sub>2</sub> satellite measurements at different solar zenith angles
title_fullStr Using a photochemical model for the validation of NO<sub>2</sub> satellite measurements at different solar zenith angles
title_full_unstemmed Using a photochemical model for the validation of NO<sub>2</sub> satellite measurements at different solar zenith angles
title_sort using a photochemical model for the validation of no<sub>2</sub> satellite measurements at different solar zenith angles
publisher Copernicus Publications
series Atmospheric Chemistry and Physics
issn 1680-7316
1680-7324
publishDate 2005-01-01
description SCIAMACHY (Scanning Imaging Spectrometer for Atmospheric Chartography) aboard the recently launched Environmental Satellite (ENVISAT) of ESA is measuring solar radiance upwelling from the atmosphere and the extraterrestrial irradiance. Appropriate inversion of the ultraviolet and visible radiance measurements, observed from the atmospheric limb, yields profiles of nitrogen dioxide, NO<sub>2</sub>, in the stratosphere (SCIAMACHY-IUP NO<sub>2</sub> profiles V1). In order to assess their accuracy, the resulting NO<sub>2</sub> profiles have been compared with those retrieved from the space borne occultation instruments Halogen Occultation Experiment (HALOE, data version v19) and Stratospheric Aerosol and Gas Experiment II (SAGE II, data version 6.2). As the HALOE and SAGE II measurements are performed during local sunrise or sunset and because NO<sub>2</sub> has a significant diurnal variability, the NO<sub>2</sub> profiles derived from HALOE and SAGE II have been transformed to those predicted for the solar zenith angles of the SCIAMACHY measurement by using a 1-dimensional photochemical model. The model used to facilitate the comparison of the NO<sub>2</sub> profiles from the different satellite sensors is described and a sensitivity ananlysis provided. Comparisons between NO<sub>2</sub> profiles from SCIAMACHY and those from HALOE NO<sub>2</sub> but transformed to the SCIAMACHY solar zenith angle, for collocations from July to October 2002, show good agreement (within +/-12%) between the altitude range from 22 to 33km. The results from the comparison of all collocated NO<sub>2</sub> profiles from SCIAMACHY and those from SAGE II transformed to the SCIAMACHY solar zenith angle show a systematic negative bias of 10 to 35% between 20km to 38km with a small standard deviation between 5 to 14%. These results agree with those of Newchurch and Ayoub (2004), implying that above 20km NO<sub>2</sub> profiles from SAGE II sunset are probably somewhat high.
url http://www.atmos-chem-phys.net/5/393/2005/acp-5-393-2005.pdf
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