Flux measurements of atmospheric ozone over land and water

Aldaz, Luis

doi:10.1029/jc074i028p06943

Cited by 138 publications

(53 citation statements)

References 13 publications

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“…Our finding that O 3 uptake on heated SDCV samples is greater than on unheated samples is consistent with the observation that O 3 is much more efficiently destroyed on dry soil than on moist soil (Aldaz, 1969). The same has been observed for O 3 decomposition on γ -Al 2 O 3 (Hanning-Lee et al, 1996), and on a Pt/γ -Al 2 O 3 catalyst at 50-90% RH (Tsai et al, 1998).…”

Section: The Influence Of Sample Heating On the Uptake Coefficientsupporting

confidence: 80%

Ozone decomposition on Saharan dust: an experimental investigation

2003

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Abstract. The heterogeneous reaction between O 3 and authentic Saharan dust surfaces was investigated in a Knudsen reactor at ≈ 296 K. O 3 was destroyed on the dust surface and O 2 was formed with conversion efficiencies of 1.0 and 1.3 molecules O 2 per O 3 molecule destroyed for unheated and heated samples, respectively. No O 3 desorbed from exposed dust samples, showing that the uptake was irreversible. The uptake coefficients for the irreversible destruction of O 3 on (unheated) Saharan dust surfaces depended on the O 3 concentration and varied between 3.5 × 10 −4 and 5.5 × 10 −6 for the initial uptake coefficient (γ 0 ≈ 3 × 10 −5 at 30 ppbv O 3 STP) and between 4.8 × 10 −5 and 2.2 × 10 −6 for the steady-state uptake coefficient (γ ss ≈ 7 × 10 −6 at 30 ppbv O 3 STP). At very high O 3 concentrations the surface was deactivated, and O 3 uptake ceased after a certain exposure period. Sample re-activation (i.e. de-passivation) was found to occur over periods of hours, after exposure to O 3 had ceased, suggesting that re-activation processes play a role both in the laboratory and in the atmosphere.

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Section: The Influence Of Sample Heating On the Uptake Coefficientsupporting

confidence: 80%

Ozone decomposition on Saharan dust: an experimental investigation

2003

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“…With these estimates of e we can reconsider the estimate of the global ozone sink strength obtained by ALDAZ [1]. Similar to his scheme we divide the earth's surface into latitude belts, but we furthermore estimate the percentage of ice and snow, desert, grassland, and wood within each latitude belt.…”

Section: Estimate Of the Global Ozone Sinkmentioning

confidence: 97%

“…Based on measurements of REGENER and ALDAZ [10], ALDAZ [1,2] calculated the global sink strength of the earth's surface, which he divided into latitudinal belts with constant concentration of tropospheric ozone. According to the distribution of land, sea and ice within every latitude belt he calculated the contribution of these three surface types to the global ozone sink.…”

Section: Introductionmentioning

confidence: 99%

Global rate of ozone destruction at the earth's surface

Fabian

Junge

1970

Arch. Met. Geoph. Biokl. A.

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SummaryModel calculations were performed to estimate the vertical ozone transport in the lower troposphere due to turbulence as a function of horizontal wind velocity and surface roughness. Using measured values of the ozone destruction rates the ozone sink strength for various surface types within different latitude belts were calculated. The global ozone sink is likely to range between 4.0 and 7.1.10 s tons/year, which is in good agreement with previous estimates by different methods. Zusammenfassung Globaler Betrag der Ozonzerst6rung an der Erdoberfl~icheMit Hilfe einer Modellrechnung wird der in der unteren Troposphfire im Mittel fiberwiegende vertikale Ozontransport durch turbulente Diffusion abgesch~itzt. Dieser h/ingt fiir die verschiedenen Oberfl/ichentypen der Erde ab yon der Oberfl/ichenwindgeschwindigkeit, der Oberfl/ichenrauhigkeit sowie der spezifischen Ozonzerst6rungsrate. Durch Aufsummierung der Zerst6rungsraten aller Oberfl/ichentypen der Erde ergibt sich eine globale Ozonsenke zwischen 4,0 und 7,1. l0 s Tonnen Ozon pro Jahr, was sich in l]bereinstimmung mit verschiedenen Absch/itzungen nach anderen Methoden befindet.

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“…Considerable progress has been made in understanding the physics and chemistry of ozone uptake by the ocean since the enclosure experiments of Aldaz (1969) brought it to the attention of the atmospheric chemistry community. Dry deposition to the ocean surface is observed to be much slower than over land surfaces (Galbally and Roy 1980) yet much faster than its meager solubility would imply (Garland et al 1980;Schwartz 1992).…”

Section: Ocean Uptakementioning

confidence: 99%

A complete dynamical ozone budget measured in the tropical marine boundary layer during PASE

et al. 2011

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The Pacific Atmospheric Sulfur Experiment (PASE) was a field mission that took place aboard the NCAR C-130 airborne laboratory over the equatorial Pacific Ocean near Christmas Island (Kirimati, Republic of Kiribati) during August-September, 2007. Eddy covariance measurements of the ozone fluxes at various altitudes above the ocean surface, along with simultaneous mapping of the horizontal gradients provided a unique opportunity to observe all of the dynamical components of the ozone budget in this remote marine environment. The results of six daytime and two sunrise flights indicate that vertical transport into the marine boundary layer from above and horizontal advection by the tradewinds are both important source terms, while photochemical destruction consisting of 82% photolysis (leading to OH production), 11% reaction with HO 2 , and 7% reaction with OH provides the main sink. The overall photochemical lifetime of ozone in the marine boundary layer was found to be 6.5 days. Ocean uptake of ozone was observed to be fairly slow (mean deposition velocity of 0.024±0.014 cm s −1 ) accounting for a diurnally averaged loss rate that was ∼30% as large as the net photochemical destruction. From the measurement of deposition velocity an ozone reactivity of ∼50 s −1 in seawater is inferred. Due to the unprecedented measurement accuracy of the dynamical budget terms, A. Bandy Department of Chemistry, Drexel University, Philadelphia, PA, USA unobserved photochemistry was able to be deduced, leading to the conclusion that 3.9±3.0 ppt (parts per trillion by volume) of NO is present on average in the daytime tropical marine boundary layer, broadly consistent with several previous studies in similar environments. It is estimated, however, that each ppt of BrO hypothetically present would counter each ppt of NO above the requisite 3.9 ppt needed for budget closure. The long-term budget of ozone is further analyzed in the buffer layer, between the boundary layer and free troposphere, and used to derive an entrainment velocity across the trade wind inversion of 0.66 ± 0.38 cm s −1.

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Flux measurements of atmospheric ozone over land and water

Cited by 138 publications

References 13 publications

Ozone decomposition on Saharan dust: an experimental investigation

Ozone decomposition on Saharan dust: an experimental investigation

Global rate of ozone destruction at the earth's surface

A complete dynamical ozone budget measured in the tropical marine boundary layer during PASE

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