Photochemical, advective and turbulent effects on the meridional distribution of ozone

Gebhart, Reiner

doi:10.1007/bf02248971

Cited by 3 publications

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“…tive importance of [2] and [3] can be determined The first direct attempt at combining photo-froin the time scales associated with each of the chemical processes with atmospheric transport to processes : that is, the exchange time for atmoreproduce the observed ozone distribution was spheric transport and the photochemical remade by Prabhakara (ll), who assumed equili-laxation time T,, I n the troposphere, the photobrium ''pure oxygen" ~h o t o c h e~~s t r~ in a two-chemical relaxation time for ozone is long corndimensional time dependent model with param-pared to the exchange time for atmospheric transeterized mean and eddy motions. Subsequent port; this implies that the ozone distribution is two-dimensional studies by Gebhart ( 12,13) in-primarily controlled by transport processes. I n valved non-equilibriuln "oxygen" alld ''oxygen-the upper stratosphere (above about 35 km) T,, hydrogen" photochemistry.…”

Section: Introductionmentioning

confidence: 99%

The Interaction of Ozone Photochemistry and Dynamics in the Stratosphere. A Three-dimensional Atmospheric Model

London¹,

Park²

1974

Can. J. Chem.

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In the stratosphere the relaxation times for transport and ozone photochemistry in a n oxygen-hydrogen-nitrogen system are approximately comparable. Therefore, realistic models used to calculate ozone variations need to be based on the interaction of t h e photochemistry and dynamics in this region.The model used in the present study is the three-dimensional global circulation model developed at the National Center for Atmospheric Research. The photochemical calculations for ozone are carried out as time dependent in a three-dimensional 0-H-N system.The dynamic model is started from an atmosphere initially at rest and then spun up t o a steady state circulation corresponding to mid-January. An initial observed ozone distribution is added and the model is then run through 30 simulated days. Analysis of t h e time variation of the ozone distribution shows that photochemistry dominates the ozone changes in the sub-solar middle stratosphere, and transport processes redistribute t h e ozone poleward and downward into the troposphere. Although the general pattern of ozone changes seem to be correct, the model produces too much ozone in the Southern hemisphere subtropical stratosphere and transports too much ozone into the Northern subtropical troposphere. The conlputed lower boundary flux of about 5 X 10'' cm-' s-' corresponds quite well to estimates given in the literature.Dans la stratosphtre, les temps de relaxation de transport et la photochimie de l'ozone dans un systkme oxygene-hydrogtne-azote sont approximativement comparables. P a r consequent, des modeles rtalistes utilists pour calculer les variations d e l'ozone se doivent d'Ctre basCs sur I'interaction de 121 photochimie et de la dynamique dans cette rCgion.Le modtle utilist dans 1'Ctude actuelle est le modtle tridimensionnel de circulation globale, dCveloppC au Centre National de Recherches AtmosphCriques. Les calculs photochimiques pour l'ozone sont effectuCs comme dCpendant du temps dans le systkme tri-

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Section: Introductionmentioning

confidence: 99%

The Interaction of Ozone Photochemistry and Dynamics in the Stratosphere. A Three-dimensional Atmospheric Model

London¹,

Park²

1974

Can. J. Chem.

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“…Diese Annahme ist jedoeh physikalisch durchaus vertretbar, denn es ist sinnvoll, die atmosph/irischen Parameter l~ings der Breitenkreise zu mitteln. Das vorliegende theore-tische Modell ist eine Erweiterung und Verbesserung eines Modells, das der Verfasser bereits ausffihrlich an anderer Stelle beschrieben hat [3]. Bei der nachfolgenden Beschreibung des physikalisch-mathematischen Modells braucht deshalb auf einige Dinge nur kurz eingegangen zu werden.…”

Section: Introductionunclassified

Ein theoretisches Modell für den Jahresgang der meridionalen Ozonverteilung in der Stratosphäre

Gebhart

1971

Arch. Met. Geoph. Biokl. A.

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ZusammenfassungEs wird ein zweidimensionales, meridionales Ozon-Modell ffir die Stratosph/ire beschrieben, das den Jahresgang der Konzentrationen zwischen Sfidpol und Nordpol und zwischen 15 km un4 45 km H6he simuliert. In der photochemischen OzonProduktionsgleichung werden die wichfigsten Reaktionen des Wasserstoff-Sauerstoff-Systems nach Chapman-Hampson in Ansatz gebracbt. Ferner werden Transport-und Austauscbvorg/inge beriicksichtigt, wobei neuere Ergebnisse hinsichtlich der Zirkulation und der groBr~iumigen Turbulenz im Modell getestet werden.In den vier Mo4ell-Rechnungen, die in dieser Arbeit pr/isentiert werden, sind verschiedene Kombinationen der ffir den Ozonhaushalt relevanten atmosph~irischen Parameter verwendet worden. Im vierten dieser Experimente ist yon der Vorgabe des jahreszeitlichen Verlaufes der Temperatur, einem wesentlichen Parameter in den Sauerstoff-Reaktionen der Ozon-Photochemie, abgesehen worden. Der Jahresgang derTemperaturen, ebenso wie der der Ozon-Konzentrationen, wird bier vielmehr in einem kombinierten Ozon-Strahlungs-Modell berechnet. Auf die Theorie des kurzwelligen und langwelligen Strahlungsfiberganges in den Banden der Absorber H20, COs und 03 wird eingegangen.Die in den vier Experimenten naeh einer Integrationszeit yon einem Jahr fiir den Monat Mfirz berechneten Ozon-Konzentrationen werden diskutiert un4 gegenfibergesteltt. Sowohl die theoretiseh ermittelten Ozon-Konzentrationen als auch die theoretisch gefundenen und mit ersteren konsistenten meridionalen TemperaturVerteilungen werden mit Mei~ergebnissen verglichen. R. GEBHART Summary A Theoretical Model for the Seasonal Variations of the Meridional Distribution of Stratospheric OzoneA two-dimensional meridional ozone-model is presented that simulates the seasonal variation of the ozone concentrations between 15 km and 45 km altituc~e and frmn pole to pole. The Chapman-Hampson approximation to the "wet" photochemical reactions of the oxygen-hydrogen-system is used in the ozone production equation. Adveetive and turbulent effects are also taken into account. Recent findings on the stratospheric circulation pattern as well as on the large scale eddy diffusion are tested in the model.The results of four mod~el-calculations are described which have been obtained from various combinations of the relevant atmospheric ozone parameters. The seasonal variation of the stratospheric temperature, an essential parameter in the "dry" photochemical reactions, is not taken from observations in one of these experiments; it is, in this case, rather calculated along with the ozone variations in a joint radiation-ozone-photochemistry-modeh The application of the theory of radiative transfer to the evaluation of the shortwave and longwave heating-rates in the bands of H~O, CO2 and 03 is briefly discussed.The time-dependent ozone-model has been integrate~ over a period of one year in all experiments. Results for the month of March are presented and compared with observed ozone and temperature distributions.

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Photochemistry Of Atmospheric Ozone

Dütsch

1971

Advances in Geophysics Volume 15

100

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Photochemical, advective and turbulent effects on the meridional distribution of ozone

Cited by 3 publications

References 30 publications

The Interaction of Ozone Photochemistry and Dynamics in the Stratosphere. A Three-dimensional Atmospheric Model

The Interaction of Ozone Photochemistry and Dynamics in the Stratosphere. A Three-dimensional Atmospheric Model

Ein theoretisches Modell für den Jahresgang der meridionalen Ozonverteilung in der Stratosphäre

Photochemistry Of Atmospheric Ozone

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