On-line measurements of ozone surface fluxes: Part II. Surface-level ozone fluxes onto the Sahara desert

Güsten, H.; Heinrich, G.; Mönnich, Erbo; Sprung, Detlev; Weppner, J.; Ramadan, A.; El-Din, Mohammed R.M. Ezz; Ahmed, Darwish M.; Hassan, G. K. Y.

doi:10.1016/1352-2310(95)00270-7

Cited by 44 publications

(26 citation statements)

References 32 publications

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“…GuK sten et al (1996b) found a daily pattern in the ozone R values over sandy soil in the Libyan desert, with values ranging from +800 s m\ during day to +4000 s m\ at night. The authors attributed this daily variation to changes in the humidity of sand particles.…”

Section: Resultsmentioning

confidence: 99%

“…In short, analog signals from eddy measurements were detrended with a 200 s high-pass digital recursive "lter. Instrument delay time was determined by rerunning the software and calculating ozone #uxes for several lag times relative to wind measurements (GuK sten et al, 1996b). Errors associated with the inappropriate orientation of the wind sensor and the presence of non-horizontal mean wind streamlines, were minimised by means of 3D co-ordinate rotation performed at the end of each measurement cycle period (Wesely, 1970).…”

Section: Methodsmentioning

confidence: 99%

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Seasonal variability of ozone dry deposition under southern European climate conditions, in Portugal

Pio

Feliciano

Vermeulen

et al. 2000

Atmospheric Environment

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Ozone dry deposition measurements were carried out during approximately one year over a #at grass "eld in Portugal. The results show prominent diurnal and seasonal patterns in deposition #ux, dry deposition velocity and surface resistance, especially for the daytime period. Dry deposition velocities vary diurnally from a minimum of 0.1 cm s\ , during the night to a maximum of 0.2}0.5 cm s\ during the day. The observed canopy resistance (R ) varies from values higher than 500 s m\ , at night, to a minimum of 200 s m\ , around noon. Seasonal variation is characterised by daytime R values much larger in summer than in winter and spring, while nighttime values do not show any evident seasonal pattern. This behaviour can be ascribed to the stomatal intake, which represents the most important controlling factor on ozone dry deposition. The Wesely parameterisation scheme of surface resistance predicts R diurnal cycles reasonably well. However, the observed canopy resistance seasonal cycle is completely di!erent from Wesely predictions, since season parameters in Wesely's parameterisation were de"ned for a vegetation growing cycle di!erent from that prevailing in our conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Seasonal variability of ozone dry deposition under southern European climate conditions, in Portugal

Pio

Feliciano

Vermeulen

et al. 2000

Atmospheric Environment

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“…The measurement principle is based on the chemiluminescence reaction of O 3 with an ozone-sensitive dye layer on an aluminum plate placed in the cell. Although its response time can reach 0.1 sec, the sensitivity is affected by the consumption of dye and environmental conditions, particularly the air humidity (Güsten et al, 1996;Muller et al, 2010). More information about the analyzer can be found in Zahn et al (2012).…”

Section: Data Collectionmentioning

confidence: 99%

“…Generally, abiotic surfaces with very little organic matter (e.g., desert or snow) have a deposition velocity on the order of 0.1 cm/sec or less (Güsten et al, 1996;Wesely and Hicks, 2000). The relatively large daytime V d (~0.4 cm/sec) in March (V d 3) might be driven by the chemical reaction of O 3 with NO and other gases emitted from soil as well as stomata uptake of O 3 (Zona et al, 2014).…”

Section: Mean Diurnal Variations Of Deposition Velocitymentioning

confidence: 99%

Ozone concentrations, flux and potential effect on yield during wheat growth in the Northwest-Shandong Plain of China

Zhu

Sun

Zhao

et al. 2015

Journal of Environmental Sciences

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“…There are indications that ozone mixing ratios are low in the North African desert. Deep in the Egyptian desert, the surface ozone mixing ratios change drastically from mean values of 50 ppbv with northerly winds to values of around 30 ppbv when the wind originates from the Libyan desert (Güsten et al 1996).…”

Section: Simultaneous Surface Co and So 2 Measurements On Gozomentioning

confidence: 99%

A 10-year study of background surface ozone concentrations on the island of Gozo in the Central Mediterranean

et al. 2008

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A 10-year study of surface ozone mixing ratios in the Central Mediterranean was conducted based on continuous ozone measurements from 1997 to 2006 by a background regional Global Atmospheric Watch (GAW) station on the island of Gozo. The mean annual maximum mixing ratio is of the order of 66 ppbv in April-May with a broad secondary maximum of 64 ppbv in July-September. No long-term increase or decrease in the background level of surface ozone could be observed over the last 10 years. This is contrary to observations made in the Eastern Mediterranean, where a slow decrease in the background ozone mixing ratio was observed over the past 7 years. Despite the very high average annual ozone mixing ratio exceeding 50 ppbv-in fact, the highest average background ozone mixing ratio ever measured in Europe-, the diurnal O 3 max /O 3 min index of <1.40 indicates that the island of Gozo is a good site for measuring background surface ozone. However, frequent photosmog events from June to September during the past 10 years with ozone mixing ratios exceeding 90 ppbv indicate that the Central Mediterranean is prone to long-range transport of air pollutants from Europe by northerly winds. This was particularly evident during the so-called "August heatwave" of the year 2003 when the overall ozone mixing ratio was 4.6 ppbv higher than the average of all other 9 months of August since 1997. Air mass back-trajectory analysis of the August 2003 photosmog episodes on Gozo confirmed that ozone pollution originated from the European continent. Regression analysis was used to analyse the 10-year data set in order to model the behaviour of the ozone mixing ratio in terms of the meteorological parameters of wind speed, relative humidity, global radiation, temperature, month of year, wind sector,

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On-line measurements of ozone surface fluxes: Part II. Surface-level ozone fluxes onto the Sahara desert

Cited by 44 publications

References 32 publications

Seasonal variability of ozone dry deposition under southern European climate conditions, in Portugal

Seasonal variability of ozone dry deposition under southern European climate conditions, in Portugal

Ozone concentrations, flux and potential effect on yield during wheat growth in the Northwest-Shandong Plain of China

A 10-year study of background surface ozone concentrations on the island of Gozo in the Central Mediterranean

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