Assessment of atmospheric processes driving ozone variations in the subtropical North Atlantic free troposphere
An analysis of the 22-yr ozone (O3) series (1988-2009) at the subtropical high mountain Izaña∿station (IZO; 2373 m a.s.l.), representative of free troposphere (FT) conditions, is presented. Diurnal and seasonal O3 variations as well as the O3 trend (0.19 ± 0.05 % yr-1 or 0.09 ppbv yr-1), are asse...
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European Geophysical Society
2013
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Online Access: | http://hdl.handle.net/10261/217821 https://doi.org/10.5194/acp-13-1973-2013 |
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ftcsic:oai:digital.csic.es:10261/217821 2024-02-11T10:06:07+01:00 Assessment of atmospheric processes driving ozone variations in the subtropical North Atlantic free troposphere Cuevas, E. González, Y. Rodríguez, S. Guerra, J.C. Gómez-Peláez, A.J. Alonso-Pérez, Silvia Bustos, J. Milford, C. 2013 http://hdl.handle.net/10261/217821 https://doi.org/10.5194/acp-13-1973-2013 unknown European Geophysical Society Publisher's version http://dx.doi.org/10.5194/acp-13-1973-2013 Sí doi:10.5194/acp-13-1973-2013 issn: 1680-7316 Atmospheric Chemistry and Physics 13: 1973- 1998 (2013) http://hdl.handle.net/10261/217821 open artículo http://purl.org/coar/resource_type/c_6501 2013 ftcsic https://doi.org/10.5194/acp-13-1973-2013 2024-01-16T10:56:55Z An analysis of the 22-yr ozone (O3) series (1988-2009) at the subtropical high mountain Izaña∿station (IZO; 2373 m a.s.l.), representative of free troposphere (FT) conditions, is presented. Diurnal and seasonal O3 variations as well as the O3 trend (0.19 ± 0.05 % yr-1 or 0.09 ppbv yr-1), are assessed. A climatology of O 3 transport pathways using backward trajectories shows that higher O3 values are associated with air masses travelling above 4 km altitude from North America and North Atlantic Ocean, while low O3 is transported from the Saharan continental boundary layer (CBL). O3 data have been compared with PM10, 210Pb, 7Be, potential vorticity (PV) and carbon monoxide (CO). A clear negative logarithmic relationship was observed between PM10 and surface O3 for all seasons. A similar relationship was found between O3 and 210Pb. The highest daily O3 values (90th percentile) are observed in spring and in the first half of summer time. A positive correlation between O3 and PV, and between O 3 and 7Be is found throughout the year, indicating that relatively high surface O3 values at IZO originate from the middle and upper troposphere. We find a good correlation between O3 and CO in winter, supporting the hypothesis of long-range transport of photochemically generated O3 from North America. Aged air masses, in combination with sporadic inputs from the upper troposphere, are observed in spring, summer and autumn. In summer time high O3 values seem to be the result of stratosphere-to-troposphere (STT) exchange processes in regions neighbouring the Canary Islands. Since 1995-1996, the North Atlantic Oscillation has changed from a predominantly high positive phase to alternating between negative, neutral or positive phases. This change results in an increased flow of the westerlies in the mid-latitude and subtropical North Atlantic, thus favouring the transport of O3 and its precursors from North America, and a higher frequency of storms over North Atlantic, with a likely higher incidence of STT processes in ... Article in Journal/Newspaper North Atlantic North Atlantic oscillation Digital.CSIC (Spanish National Research Council) Atmospheric Chemistry and Physics 13 4 1973 1998 |
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Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
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unknown |
description |
An analysis of the 22-yr ozone (O3) series (1988-2009) at the subtropical high mountain Izaña∿station (IZO; 2373 m a.s.l.), representative of free troposphere (FT) conditions, is presented. Diurnal and seasonal O3 variations as well as the O3 trend (0.19 ± 0.05 % yr-1 or 0.09 ppbv yr-1), are assessed. A climatology of O 3 transport pathways using backward trajectories shows that higher O3 values are associated with air masses travelling above 4 km altitude from North America and North Atlantic Ocean, while low O3 is transported from the Saharan continental boundary layer (CBL). O3 data have been compared with PM10, 210Pb, 7Be, potential vorticity (PV) and carbon monoxide (CO). A clear negative logarithmic relationship was observed between PM10 and surface O3 for all seasons. A similar relationship was found between O3 and 210Pb. The highest daily O3 values (90th percentile) are observed in spring and in the first half of summer time. A positive correlation between O3 and PV, and between O 3 and 7Be is found throughout the year, indicating that relatively high surface O3 values at IZO originate from the middle and upper troposphere. We find a good correlation between O3 and CO in winter, supporting the hypothesis of long-range transport of photochemically generated O3 from North America. Aged air masses, in combination with sporadic inputs from the upper troposphere, are observed in spring, summer and autumn. In summer time high O3 values seem to be the result of stratosphere-to-troposphere (STT) exchange processes in regions neighbouring the Canary Islands. Since 1995-1996, the North Atlantic Oscillation has changed from a predominantly high positive phase to alternating between negative, neutral or positive phases. This change results in an increased flow of the westerlies in the mid-latitude and subtropical North Atlantic, thus favouring the transport of O3 and its precursors from North America, and a higher frequency of storms over North Atlantic, with a likely higher incidence of STT processes in ... |
format |
Article in Journal/Newspaper |
author |
Cuevas, E. González, Y. Rodríguez, S. Guerra, J.C. Gómez-Peláez, A.J. Alonso-Pérez, Silvia Bustos, J. Milford, C. |
spellingShingle |
Cuevas, E. González, Y. Rodríguez, S. Guerra, J.C. Gómez-Peláez, A.J. Alonso-Pérez, Silvia Bustos, J. Milford, C. Assessment of atmospheric processes driving ozone variations in the subtropical North Atlantic free troposphere |
author_facet |
Cuevas, E. González, Y. Rodríguez, S. Guerra, J.C. Gómez-Peláez, A.J. Alonso-Pérez, Silvia Bustos, J. Milford, C. |
author_sort |
Cuevas, E. |
title |
Assessment of atmospheric processes driving ozone variations in the subtropical North Atlantic free troposphere |
title_short |
Assessment of atmospheric processes driving ozone variations in the subtropical North Atlantic free troposphere |
title_full |
Assessment of atmospheric processes driving ozone variations in the subtropical North Atlantic free troposphere |
title_fullStr |
Assessment of atmospheric processes driving ozone variations in the subtropical North Atlantic free troposphere |
title_full_unstemmed |
Assessment of atmospheric processes driving ozone variations in the subtropical North Atlantic free troposphere |
title_sort |
assessment of atmospheric processes driving ozone variations in the subtropical north atlantic free troposphere |
publisher |
European Geophysical Society |
publishDate |
2013 |
url |
http://hdl.handle.net/10261/217821 https://doi.org/10.5194/acp-13-1973-2013 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
Publisher's version http://dx.doi.org/10.5194/acp-13-1973-2013 Sí doi:10.5194/acp-13-1973-2013 issn: 1680-7316 Atmospheric Chemistry and Physics 13: 1973- 1998 (2013) http://hdl.handle.net/10261/217821 |
op_rights |
open |
op_doi |
https://doi.org/10.5194/acp-13-1973-2013 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
13 |
container_issue |
4 |
container_start_page |
1973 |
op_container_end_page |
1998 |
_version_ |
1790603600686219264 |