Comparison and synergy of stratospheric ozone measurements by satellite limb sounders and the ground-based microwave radiometer SOMORA
Stratospheric O<sub>3</sub> profiles obtained by the satellite limb sounders Aura/MLS, ENVISAT/MIPAS, ENVISAT/GOMOS, SAGE-II, SAGE-III, UARS/HALOE are compared to coincident O<sub>3</sub> profiles of the ground-based microwave radiometer SOMORA...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2007-08-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/7/4117/2007/acp-7-4117-2007.pdf |
| _version_ | 1818663695942680576 |
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| author | K. Hocke N. Kämpfer D. Ruffieux L. Froidevaux A. Parrish I. Boyd T. von Clarmann T. Steck Y. M. Timofeyev A. V. Polyakov E. Kyrölä |
| author_facet | K. Hocke N. Kämpfer D. Ruffieux L. Froidevaux A. Parrish I. Boyd T. von Clarmann T. Steck Y. M. Timofeyev A. V. Polyakov E. Kyrölä |
| author_sort | K. Hocke |
| collection | DOAJ |
| description | Stratospheric O<sub>3</sub> profiles obtained by the satellite limb sounders Aura/MLS, ENVISAT/MIPAS, ENVISAT/GOMOS, SAGE-II, SAGE-III, UARS/HALOE are compared to coincident O<sub>3</sub> profiles of the ground-based microwave radiometer SOMORA in Switzerland. Data from the various measurement techniques are within 10% at altitudes below 45 km. At altitudes 45&ndash;60 km, the relative O<sub>3</sub> differences are within a range of 50%. Larger deviations at upper altitudes are attributed to larger relative measurement errors caused by lower O<sub>3</sub> concentrations. The spatiotemporal characteristics of the O<sub>3</sub> differences (satellite &ndash; ground station) are investigated by analyzing about 2300 coincident profile pairs of Aura/MLS (retrieval version 1.5) and SOMORA. The probability density function of the O<sub>3</sub> differences is represented by a Gaussian normal distribution. The dependence of the O<sub>3</sub> differences on the horizontal distance between the sounding volumes of Aura/MLS and SOMORA is derived. While the mean bias (Aura/MLS &ndash; SOMORA) is constant with increasing horizontal distance (up to 800 km), the standard deviation of the O<sub>3</sub> differences increases from around 8 to 11% in the mid-stratosphere. Geographical maps yield azimuthal dependences and horizontal gradients of the O<sub>3</sub> difference field around the SOMORA ground station. Coherent oscillations of O<sub>3</sub> are present in the time series of Aura/MLS and SOMORA (e.g., due to traveling planetary waves). Ground- and space-based measurements often complement one another. We discuss the double differencing technique which allows both the cross-validation of two satellites by means of a ground station and the cross-validation of distant ground stations by means of one satellite. Temporal atmospheric noise in the geographical ozone map over Payerne is significantly reduced by combination of the data from SOMORA and Aura/MLS. These analyses illustrate the synergy of ground-based and space-based measurements. |
| first_indexed | 2024-12-17T05:20:56Z |
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| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-17T05:20:56Z |
| publishDate | 2007-08-01 |
| publisher | Copernicus Publications |
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| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-b83d91badcd54ee7aee4e1526f9b55aa2022-12-21T22:01:58ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242007-08-0171541174131Comparison and synergy of stratospheric ozone measurements by satellite limb sounders and the ground-based microwave radiometer SOMORAK. HockeN. KämpferD. RuffieuxL. FroidevauxA. ParrishI. BoydT. von ClarmannT. SteckY. M. TimofeyevA. V. PolyakovE. KyröläStratospheric O<sub>3</sub> profiles obtained by the satellite limb sounders Aura/MLS, ENVISAT/MIPAS, ENVISAT/GOMOS, SAGE-II, SAGE-III, UARS/HALOE are compared to coincident O<sub>3</sub> profiles of the ground-based microwave radiometer SOMORA in Switzerland. Data from the various measurement techniques are within 10% at altitudes below 45 km. At altitudes 45&ndash;60 km, the relative O<sub>3</sub> differences are within a range of 50%. Larger deviations at upper altitudes are attributed to larger relative measurement errors caused by lower O<sub>3</sub> concentrations. The spatiotemporal characteristics of the O<sub>3</sub> differences (satellite &ndash; ground station) are investigated by analyzing about 2300 coincident profile pairs of Aura/MLS (retrieval version 1.5) and SOMORA. The probability density function of the O<sub>3</sub> differences is represented by a Gaussian normal distribution. The dependence of the O<sub>3</sub> differences on the horizontal distance between the sounding volumes of Aura/MLS and SOMORA is derived. While the mean bias (Aura/MLS &ndash; SOMORA) is constant with increasing horizontal distance (up to 800 km), the standard deviation of the O<sub>3</sub> differences increases from around 8 to 11% in the mid-stratosphere. Geographical maps yield azimuthal dependences and horizontal gradients of the O<sub>3</sub> difference field around the SOMORA ground station. Coherent oscillations of O<sub>3</sub> are present in the time series of Aura/MLS and SOMORA (e.g., due to traveling planetary waves). Ground- and space-based measurements often complement one another. We discuss the double differencing technique which allows both the cross-validation of two satellites by means of a ground station and the cross-validation of distant ground stations by means of one satellite. Temporal atmospheric noise in the geographical ozone map over Payerne is significantly reduced by combination of the data from SOMORA and Aura/MLS. These analyses illustrate the synergy of ground-based and space-based measurements.http://www.atmos-chem-phys.net/7/4117/2007/acp-7-4117-2007.pdf |
| spellingShingle | K. Hocke N. Kämpfer D. Ruffieux L. Froidevaux A. Parrish I. Boyd T. von Clarmann T. Steck Y. M. Timofeyev A. V. Polyakov E. Kyrölä Comparison and synergy of stratospheric ozone measurements by satellite limb sounders and the ground-based microwave radiometer SOMORA Atmospheric Chemistry and Physics |
| title | Comparison and synergy of stratospheric ozone measurements by satellite limb sounders and the ground-based microwave radiometer SOMORA |
| title_full | Comparison and synergy of stratospheric ozone measurements by satellite limb sounders and the ground-based microwave radiometer SOMORA |
| title_fullStr | Comparison and synergy of stratospheric ozone measurements by satellite limb sounders and the ground-based microwave radiometer SOMORA |
| title_full_unstemmed | Comparison and synergy of stratospheric ozone measurements by satellite limb sounders and the ground-based microwave radiometer SOMORA |
| title_short | Comparison and synergy of stratospheric ozone measurements by satellite limb sounders and the ground-based microwave radiometer SOMORA |
| title_sort | comparison and synergy of stratospheric ozone measurements by satellite limb sounders and the ground based microwave radiometer somora |
| url | http://www.atmos-chem-phys.net/7/4117/2007/acp-7-4117-2007.pdf |
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