Science, Space and Technology News 2024
Venus’ atmosphere shows surprising water isotopologue levels, indicating it might once have been as watery as Earth. Enhanced deuterium due to solar exposure suggests extensive historical water loss, reshaping our understanding of its climatic evolution. Credit: SciTechDaily.com
Express mission reveal unexpected water molecule concentrations in Venus’ atmosphere, suggesting it once harbored Earth-like water volumes.Thanks to observations by the Solar Occultation in the Infrared instrument on the Venus Express space probe of theO in Venus’ mesosphere. This phenomenon challenges our understanding of Venus’ water history and the potential that it was once habitable in the past.Currently, Venus is a dry, hostile planet.
“Venus is often called Earth’s twin due to its similar size,” remarks Hiroki Karyu, a researcher at Tohoku University, “Despite the similarities between the two planets, it has evolved differently. Unlike Earth, Venus has extreme surface conditions.”O and its deuterated counterpart HDO reveals insights into Venus’ water history. It is generally accepted that Venus and Earth initially had a similar HDO/HO ratio.
This enrichment is primarily due to solar radiation breaking down water isotopologues in the upper atmosphere, producing hydrogen and deuterium atoms. Since H atoms escape into space more readily due to their lower mass, the HDO/HMechanisms of Water Variation in Venus’ Atmosphere To figure out how much H and D are escaping into space, it is crucial to measure the water isotopologue amounts at heights where sunlight can break them down, which occurs above the clouds at altitudes larger than ~70 km. The study found two surprising results: the concentrations of HO ratio rises significantly by an order of magnitude over this range, reaching levels over 1500 times higher than in Earth’s oceans.) aerosols.
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