The natural oscillations in stratospheric ozone observed by the GROMOS microwave radiometer at the NDACC station Bern
A multilinear parametric regression analysis was performed to assess the seasonal and interannual variations of stratospheric ozone profiles from the GROMOS (GROund-based Millimeter-wave Ozone Spectrometer) microwave radiometer at Bern, Switzerland (46.95° N, 7.44° E; 577 m). GROMOS takes part i...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2016-08-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/16/10455/2016/acp-16-10455-2016.pdf |
| _version_ | 1818669413427052544 |
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| author | L. Moreira K. Hocke F. Navas-Guzmán E. Eckert T. von Clarmann N. Kämpfer |
| author_facet | L. Moreira K. Hocke F. Navas-Guzmán E. Eckert T. von Clarmann N. Kämpfer |
| author_sort | L. Moreira |
| collection | DOAJ |
| description | A multilinear parametric regression analysis was performed to assess the
seasonal and interannual variations of stratospheric ozone profiles from the
GROMOS (GROund-based Millimeter-wave Ozone Spectrometer) microwave radiometer
at Bern, Switzerland (46.95° N, 7.44° E; 577 m). GROMOS
takes part in the Network for the Detection of Atmospheric Composition Change
(NDACC). The study covers the stratosphere from 50 to 0.5 hPa (from 21 to
53 km) and extends over the period from January 1997 to January 2015. The
natural variability was fitted during the regression analysis through the
annual and semi-annual oscillations (AO, SAO), the quasi-biennial oscillation
(QBO), the El Niño–Southern Oscillation (ENSO) and the solar activity
cycle. Seasonal ozone variations mainly appear as an annual cycle in the
middle and upper stratosphere and a semi-annual cycle in the upper
stratosphere. Regarding the interannual variations, they are primarily
present in the lower and middle stratosphere. In the lower and middle
stratosphere, ozone variations are controlled predominantly by transport
processes, due to the long lifetime of ozone, whereas in the upper
stratosphere its lifetime is relatively short and ozone is controlled mainly
by photochemistry. The present study shows agreement in the observed
naturally induced ozone signatures with other studies. Further, we present an
overview of the possible causes of the effects observed in stratospheric
ozone due to natural oscillations at a northern midlatitude station. For
instance regarding the SAO, we find that polar winter stratopause warmings
contribute to the strength of this oscillation since these temperature
enhancements lead to a reduction in upper stratospheric ozone. We have
detected a strong peak amplitude of about 5 % for the solar cycle in lower
stratospheric ozone for our 1.5 cycles of solar activity. Though the 11-year
ozone oscillation above Bern is in phase with the solar cycle, we suppose
that the strong amplitude is partly due to meteorological disturbances and
associated ozone anomalies in the Northern Hemisphere. Further, our
observational study gave the result that ozone above Bern is anti-correlated
with the ENSO phenomenon in the lower stratosphere and correlated in the
middle stratosphere. |
| first_indexed | 2024-12-17T06:51:49Z |
| format | Article |
| id | doaj.art-9f2a19b8ed994409a30852572dcd0574 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-17T06:51:49Z |
| publishDate | 2016-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-9f2a19b8ed994409a30852572dcd05742022-12-21T21:59:34ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242016-08-0116104551046710.5194/acp-16-10455-2016The natural oscillations in stratospheric ozone observed by the GROMOS microwave radiometer at the NDACC station BernL. Moreira0K. Hocke1F. Navas-Guzmán2E. Eckert3T. von Clarmann4N. Kämpfer5Institute of Applied Physics and Oeschger Centre for Climate Change Research, University of Bern, Bern, SwitzerlandInstitute of Applied Physics and Oeschger Centre for Climate Change Research, University of Bern, Bern, SwitzerlandInstitute of Applied Physics and Oeschger Centre for Climate Change Research, University of Bern, Bern, SwitzerlandKarlsruhe Institute of Technology, Institute for Meteorology and Climate Research, Karlsruhe, GermanyKarlsruhe Institute of Technology, Institute for Meteorology and Climate Research, Karlsruhe, GermanyInstitute of Applied Physics and Oeschger Centre for Climate Change Research, University of Bern, Bern, SwitzerlandA multilinear parametric regression analysis was performed to assess the seasonal and interannual variations of stratospheric ozone profiles from the GROMOS (GROund-based Millimeter-wave Ozone Spectrometer) microwave radiometer at Bern, Switzerland (46.95° N, 7.44° E; 577 m). GROMOS takes part in the Network for the Detection of Atmospheric Composition Change (NDACC). The study covers the stratosphere from 50 to 0.5 hPa (from 21 to 53 km) and extends over the period from January 1997 to January 2015. The natural variability was fitted during the regression analysis through the annual and semi-annual oscillations (AO, SAO), the quasi-biennial oscillation (QBO), the El Niño–Southern Oscillation (ENSO) and the solar activity cycle. Seasonal ozone variations mainly appear as an annual cycle in the middle and upper stratosphere and a semi-annual cycle in the upper stratosphere. Regarding the interannual variations, they are primarily present in the lower and middle stratosphere. In the lower and middle stratosphere, ozone variations are controlled predominantly by transport processes, due to the long lifetime of ozone, whereas in the upper stratosphere its lifetime is relatively short and ozone is controlled mainly by photochemistry. The present study shows agreement in the observed naturally induced ozone signatures with other studies. Further, we present an overview of the possible causes of the effects observed in stratospheric ozone due to natural oscillations at a northern midlatitude station. For instance regarding the SAO, we find that polar winter stratopause warmings contribute to the strength of this oscillation since these temperature enhancements lead to a reduction in upper stratospheric ozone. We have detected a strong peak amplitude of about 5 % for the solar cycle in lower stratospheric ozone for our 1.5 cycles of solar activity. Though the 11-year ozone oscillation above Bern is in phase with the solar cycle, we suppose that the strong amplitude is partly due to meteorological disturbances and associated ozone anomalies in the Northern Hemisphere. Further, our observational study gave the result that ozone above Bern is anti-correlated with the ENSO phenomenon in the lower stratosphere and correlated in the middle stratosphere.https://www.atmos-chem-phys.net/16/10455/2016/acp-16-10455-2016.pdf |
| spellingShingle | L. Moreira K. Hocke F. Navas-Guzmán E. Eckert T. von Clarmann N. Kämpfer The natural oscillations in stratospheric ozone observed by the GROMOS microwave radiometer at the NDACC station Bern Atmospheric Chemistry and Physics |
| title | The natural oscillations in stratospheric ozone observed by the GROMOS microwave radiometer at the NDACC station Bern |
| title_full | The natural oscillations in stratospheric ozone observed by the GROMOS microwave radiometer at the NDACC station Bern |
| title_fullStr | The natural oscillations in stratospheric ozone observed by the GROMOS microwave radiometer at the NDACC station Bern |
| title_full_unstemmed | The natural oscillations in stratospheric ozone observed by the GROMOS microwave radiometer at the NDACC station Bern |
| title_short | The natural oscillations in stratospheric ozone observed by the GROMOS microwave radiometer at the NDACC station Bern |
| title_sort | natural oscillations in stratospheric ozone observed by the gromos microwave radiometer at the ndacc station bern |
| url | https://www.atmos-chem-phys.net/16/10455/2016/acp-16-10455-2016.pdf |
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