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Assessment of Atmospheric Processes Driving Ozone Variations in the Subtropical North Atlantic Free Troposphere : Volume 12, Issue 10 (30/10/2012)

By Cuevas, E.

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Book Id: WPLBN0003975509
Format Type: PDF Article :
File Size: Pages 66
Reproduction Date: 2015

Title: Assessment of Atmospheric Processes Driving Ozone Variations in the Subtropical North Atlantic Free Troposphere : Volume 12, Issue 10 (30/10/2012)  
Author: Cuevas, E.
Volume: Vol. 12, Issue 10
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Guerra, J. C., Bustos, J., Alonso-Pérez, S., González, Y., Cuevas, E., Rodríguez, S.,...Milford, C. (2012). Assessment of Atmospheric Processes Driving Ozone Variations in the Subtropical North Atlantic Free Troposphere : Volume 12, Issue 10 (30/10/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: Izaña Atmospheric Research Centre (IARC), Agencia Estatal de Meteorología (AEMET), Izaña, Spain. 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), are assessed. A climatology of O3 transport pathways using backward trajectories shows that higher O3 values are associated with air masses traveling 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, but only for the summer-time. 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. At IZO 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.

Summary
Assessment of atmospheric processes driving ozone variations in the subtropical North Atlantic free troposphere

Excerpt
Alonso-Pérez, S., Cuevas, E., Querol, X., Viana, M., and Guerra, J.: Impact of the Saharan dust outbreaks on the ambient levels of total suspended particles (TSP) in the marine boundary layer (MBL) of the Subtropical Eastern North Atlantic Ocean, Atmos. Environ., 41, 9468–9480, 2007.; Alonso-Pérez, S., Cuevas, E., Pérez, C., Querol, X., Baldasano, J., Draxler, R., and de Bustos, J.: Trend changes of African airmass intrusions in the marine boundary layer over the subtropical Eastern North Atlantic region in winter, Tellus B, 63B, 255–265, 2011.; Andrade, C., Trigo, R., Freitas, M., Gallego, M., Borges, P., and Ramos, A.: Comparing historic records of storm frequency and the North Atlantic Oscillation (NAO) chronology for the Azores region, The Holocene, 18, 745–754, 2008.; Appenzeller, C., Davies, H., and Norton, W.: Fragmentation of stratospheric intrusions, J. Geophys. Res., 101, 1435–1456, 1996.; Appenzeller, C., Weiss, A., and Staehelin, J.: North Atlantic oscillation modulates total ozone winter trends, Geophys. Res. Lett., 27, 1131–1134, 2000.; Andrey, J., Gil, M., Alonso-Pérez, S., Parrondo, C., Redondas, A., and Cuevas, E.: Tropospheric ozone under Saharan dust: a statistical study on vertical distribution, in: International Aerosol Conference, number 873, Helsinki (Finland), 29 August–3 September, 2010.; Auvray, M. and Bey, I.: Long-range transport to Europe: seasonal variations and implications for the European ozone budget, Geophys. Res. Lett., 110, D11303, 1–22, doi:10.1029/2004JD005503, 2005.; Balkanski, Y. J., Jacob, D., Gardner, G., Graustein, W., and Turekian, K.: Transport and residence times of tropospheric aerosols inferred from a global three-dimensional simulation of 210Pb, J. Geophys. Res., 98, 20573–20586, 1993.; Beekman, M., Ancellet, G., and Megie, G.: Climatology of tropospheric ozone in southern Europe and its relation to potential vorticity, J. Geophys. Res., 99, 12841–12853, 1994.; Berkowtiz, C., Daum, P., Spicer, C., and Busness, K.: Synoptic patterns associated with the flux of excess ozone to the western North Atlantic, J. Geophys. Res., 101, 28923–28933, 1996.; Bonasoni, P., Cristofanelli, P., Calzolari, F., Bonaf{è}, U., Evangelisti, F., Stohl, A., Zauli Sajani, S., van Dingenen, R., Colombo, T., and Balkanski, Y.: Aerosol-ozone correlations during dust transport episodes, Atmos. Chem. Phys., 4, 1201–1215, doi:10.5194/acp-4-1201-2004, 2004.; Chiapello, I., Moulin, C., and Prospero, J.: Understanding the long-term variability of African dust transport across the Atlantic as recorded in both Barbados surface concentrations and large-scale Total ozone Mapping Spectrometer (TOMS) optical thickness, J. Geophys. Res., 110, D18S10, doi:10.1029/2004JD005132, 2005.; Chin, M., Jacob, D., Munger, J., Parrish, D. D., and Doddridge, B.: Relationship of ozone and carbon monoxide over North America, J. Geophys. Res., 99, 14565–14573, doi:10.1029/2004JD005132, 1994.; Cooper, O. and Parrish, D.: Air Pollution Export from and Emport to North America: Experimental Evidence, The Handbook of Envi

 

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