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 Iza˜na station (IZO; 2373m 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 ppbvyr−1), are assessed. A...
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European Geosciences Union
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Online Access: | http://hdl.handle.net/10272/7940 https://doi.org/10.5194/acp-13-1973-2013 |
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ftunivhuelva:oai:rabida.uhu.es:10272/7940 2023-05-15T17:27:53+02:00 Assessment of atmospheric processes driving ozone variations in the subtropical North Atlantic free troposphere Cuevas, Emilio González, Y. Rodríguez González, Sergio Guerra, J. C. Gómez Pélaez, A. J. Alonso Pérez, Silvia Bustos, J. Milford, C. 2013 http://hdl.handle.net/10272/7940 https://doi.org/10.5194/acp-13-1973-2013 spa spa European Geosciences Union Cuevas, E., González, Y., Rodríguez González, S., Guerra, J.C., Gómez Pélaez, A.J., Alonso Pérez, S., Bustos, J., Milford, C.: "Assessment of atmospheric processes driving ozone variations in the subtropical North Atlantic free troposphere". Atmospheric Chemistry and Physics. Vol. 13,, p. .1973–1998 (2013). ISSN 1680-7324 1680-7324 http://hdl.handle.net/10272/7940 doi:10.5194/acp-13-1973-2013 Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ info:eu-repo/semantics/openAccess CC-BY-NC-ND info:eu-repo/semantics/article 2013 ftunivhuelva https://doi.org/10.5194/acp-13-1973-2013 2021-08-11T19:41:39Z An analysis of the 22-yr ozone (O3) series (1988– 2009) at the subtropical high mountain Iza˜na station (IZO; 2373m 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 ppbvyr−1), are assessed. A climatology of O3 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 O3 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 mid-latitudes. These processes lead to an increase of tropospheric O3 in the subtropical North Atlantic region after 1996 that has been reflected in surface O3 records at IZO. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Universidad de Huelva: Arias Montano Atmospheric Chemistry and Physics 13 4 1973 1998 |
institution |
Open Polar |
collection |
Universidad de Huelva: Arias Montano |
op_collection_id |
ftunivhuelva |
language |
Spanish |
description |
An analysis of the 22-yr ozone (O3) series (1988– 2009) at the subtropical high mountain Iza˜na station (IZO; 2373m 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 ppbvyr−1), are assessed. A climatology of O3 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 O3 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 mid-latitudes. These processes lead to an increase of tropospheric O3 in the subtropical North Atlantic region after 1996 that has been reflected in surface O3 records at IZO. |
format |
Article in Journal/Newspaper |
author |
Cuevas, Emilio González, Y. Rodríguez González, Sergio Guerra, J. C. Gómez Pélaez, A. J. Alonso Pérez, Silvia Bustos, J. Milford, C. |
spellingShingle |
Cuevas, Emilio González, Y. Rodríguez González, Sergio Guerra, J. C. Gómez Pélaez, 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, Emilio González, Y. Rodríguez González, Sergio Guerra, J. C. Gómez Pélaez, A. J. Alonso Pérez, Silvia Bustos, J. Milford, C. |
author_sort |
Cuevas, Emilio |
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 Geosciences Union |
publishDate |
2013 |
url |
http://hdl.handle.net/10272/7940 https://doi.org/10.5194/acp-13-1973-2013 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
Cuevas, E., González, Y., Rodríguez González, S., Guerra, J.C., Gómez Pélaez, A.J., Alonso Pérez, S., Bustos, J., Milford, C.: "Assessment of atmospheric processes driving ozone variations in the subtropical North Atlantic free troposphere". Atmospheric Chemistry and Physics. Vol. 13,, p. .1973–1998 (2013). ISSN 1680-7324 1680-7324 http://hdl.handle.net/10272/7940 doi:10.5194/acp-13-1973-2013 |
op_rights |
Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY-NC-ND |
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_ |
1766120214555000832 |