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Two-dimensional distributions of sulfur compounds in the troposphere: Implications for the atmospheric sulfur budget

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Il Nuovo Cimento C

Summary

We have built a two-dimensional model of the lower atmosphere extending from pole to pole and from the ground to about 20 km. Meridional circulation is obtained from observational data of vertical velocity and is made self-consistent for the meridional velocity through the use of the continuity equation. Eddy processes are parameterized in terms of eddy diffusion coefficients. Results are reported for OCS, CS2, H2S, CH3SCH3, SO2 and compared both with available experimental data and other similar calculations. Our results show a general agreement with both concentrations and fluxes. Production of SO2 takes into account both natural and anthropogenic sources. An interesting result is found for OCS which seems to have a net chemical production in the troposphere. A possible role of OCS as a stratospheric sulphur source should be reconsidered.

Riassunto

Abbiamo costruito un modello bidimensionale della bassa atmosfera con estensione da polo a polo e dal suolo a circa 20 km. La circolazione meridionale è ottenuta da misure sperimentali di velocità verticale ed è resa autoconsistente per la velocità meridionale con l'uso dell'equazione di continuità. Il trasporto dovuto alle turbolenze è parametrizzato in termini di coefficienti di diffusione turbolenta. Sono presentati i risultati per OCS, CS2, H2S, CH3SCH3, SO2 e sono confrontati sia con dati sperimentali disponibili che con altri calcoli simili. I nostri risultati mostrano un accordo generale sia con le concentrazioni che con i flussi. La produzione di SO2 tiene conto sia di sorgenti naturali che antropogeniche. Si è ottenuto un risultato interessante per OCS che sembra avere una produzione chimica netta in troposfera. Un possibile ruolo di OCS come sorgente stratosferica di zolfo dovrebbe essere ripreso in considerazione.

Резюме

Мы предлагаем двумерную модель нижней атмосферы, простирающейся от полюса до полюса и от Земли до высоты 20 км. На основе наблюдаемых данных для вертикальной скорости получается меридиональная циркуляция. Используя уравнение непрерывности, получается самосогласованность для меридиональной скорости. Вихревые процессы параметризуются на основе коэффициентов вихревой диффузии. Приводятся результаты для OCS, CS2, H2S, CH3SCH3, SO2, которые сравниваются с имеюшимися экспериментальными данными и результатами аналогичных вычиислений. Нащи результаты обнаруживают обшее согласие для концентраций и для потоков. Учитываются оба источника образования SO2: естественный и антропогенный. Получен интересный результат для OCS, который указывает на образование химической сети в тропосфере. Заново рассматривается возможная роль OCS, как стратосферного источника серы.

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Authors and Affiliations

  1. Dipatimento di Fisica dell' Università degli Studi, 67100, L'Aquila, Italia

    G. Visconti, G. Pitari & D. Menaguale

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  1. G. Visconti
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  2. G. Pitari
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  3. D. Menaguale
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Visconti, G., Pitari, G. & Menaguale, D. Two-dimensional distributions of sulfur compounds in the troposphere: Implications for the atmospheric sulfur budget. Il Nuovo Cimento C 8, 655–679 (1985). https://doi.org/10.1007/BF02558000

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  • DOI: https://doi.org/10.1007/BF02558000

PACS. 92. 60

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