Runaway Greenhouse Effect - Venus


A runaway greenhouse effect involving carbon dioxide and water vapor may have occurred on Venus. In this scenario, early Venus may have had a global ocean. As the brightness of the early Sun increased, the amount of water vapor in the atmosphere increased, increasing the temperature and consequently increasing the evaporation of the ocean, leading eventually to the situation in which the oceans boiled, and all of the water vapor entered the atmosphere. On Venus today there is little water vapor in the atmosphere. If water vapor did contribute to the warmth of Venus at one time, this water is thought to have escaped to space. Some evidence for this scenario comes from the extremely high Deuterium to Hydrogen ratio in Venus' atmosphere, roughly ~150x that of Earth, since light hydrogen would escape from the atmosphere more readily than its heavier isotope, Deuterium. Venus is sufficiently strongly heated by the Sun that water vapor can rise much higher in the atmosphere and be split into hydrogen and oxygen by ultraviolet light. The hydrogen can then escape from the atmosphere and the oxygen recombines. Carbon dioxide, the dominant greenhouse gas in the current Venusian atmosphere, owes its larger concentration to the weakness of carbon recycling as compared to Earth (which requires liquid water), where the carbon dioxide emitted from volcanoes is efficiently subducted into the Earth by plate tectonics on geologic time scales.

Read more about this topic:  Runaway Greenhouse Effect

Other articles related to "venus":

Knox Martin - Work
... One of his wall paintings in New York City is the twelve-story mural Venus ... Painted in 1970, Venus is located on the south side of Bayview Correctional Facility at 19th Street and the West Side Highway ... "Traditionally the goddess of love and fertility, Venus represents woman, erotic and supple, but it also conveys Knox Martin's love affair with New York ...
Tannhäuser (opera) - Composition History - The Paris Version
... dramatic sense by representing the sensual world of Venus's realm ... Venus, a role that in the Dresden version was considered a soprano, now calls for a mezzo soprano ... Venus' aria "Geliebter, komm!" was transposed down half a step and was completely altered from "...wonnige Glut durchschwelle dein Herz" ...
March 1961 - March 10, 1961 (Friday)
... The first definite proof that a signal could be sent to Venus and returned to Earth, using radar astronomy, was made by the Jet Propulsion Laboratory ... megacycle frequency, traveling 35 million miles to Venus and then back to Earth, in a little more than six minutes ... Signals had been bounced off of Venus before, but never received back clearly enough to be "immediately detectable" ...
Venus, Florida - Geography
... Venus is located at 27°04′01″N 81°21′25″W / 27.0669°N 81.3569°W / 27.0669 -81.3569Coordinates 27°04′01″N 81°21′25″W / 27.0669°N ...
Tannhäuser (opera) - Synopsis - Act 1
... Tannhäuser is held there a willing captive through his love for Venus ... When Venus again tries to charm him, he declares "My salvation rests in Mary, the mother of God." These words break the unholy spell ... Venus and her attendants disappear, and he suddenly finds himself just below the Wartburg ...

Famous quotes containing the word venus:

    Yet have I fierce affections, and think
    What Venus did with Mars.
    William Shakespeare (1564–1616)

    In the drawing room [of the Queen’s palace] hung a Venus and Cupid by Michaelangelo, in which, instead of a bit of drapery, the painter has placed Cupid’s foot between Venus’s thighs. Queen Caroline asked General Guise, an old connoisseur, if it was not a very fine piece? He replied “Madam, the painter was a fool, for he has placed the foot where the hand should be.”
    Horace Walpole (1717–1797)

    For her own person,
    It beggared all description: she did lie
    In her pavilion—cloth of gold, of tissue—
    O’er-picturing that Venus where we see
    The fancy outwork nature.
    William Shakespeare (1564–1616)