H2SO4 cycle in the Venusian tropical atmosphere as constrained by a microphysical cloud model

T. Imamura, Joji Hashimoto

Research output: Contribution to journalArticle

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Abstract

A one-dimensional microphysical model study revealed that vertical winds govern the H2SO4 cycle in the equatorial cloud system of Venus. In the upper cloud region, photochemical production of H2SO4 vapor leads to the formation of small droplets, which are blown off by the upward/poleward branck of the Hadley circulation. In the middle and lower cloud regions, H2SO4 vapor is supplied from below by dynamical processes and condenses into large droplets, which fall against the upwelling of the Hadley circulation. The local circulation of H2SO4 near the cloud base explains the observed accumulation of H2SO4 vapor beneath the equatorial cloud. It was also revealed that the transient strong vertical winds associated with transient eddies can explain the contradictory results for the particle size distribution observed by entry probes: The adiabatic cooling in an updraft forces H2SO4 vapor to condense onto condensation nuclei, thereby producing a large number of middle-size droplets.

Original languageEnglish
Pages (from-to)249-254
Number of pages6
JournalAdvances in Space Research
Volume29
Issue number2
DOIs
Publication statusPublished - Jan 2002
Externally publishedYes

Fingerprint

atmospheres
cycles
Vapors
atmosphere
vapors
droplet
vertical air currents
condensation nuclei
updraft
Venus (planet)
upwelling water
Venus
particle size distribution
entry
Particle size analysis
condensation
Condensation
eddy
upwelling
probe

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

H2SO4 cycle in the Venusian tropical atmosphere as constrained by a microphysical cloud model. / Imamura, T.; Hashimoto, Joji.

In: Advances in Space Research, Vol. 29, No. 2, 01.2002, p. 249-254.

Research output: Contribution to journalArticle

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