H2O and HDO

Water is scarcely present today and it is not yet known if Venus was already dry at its formation or evolved slowly to its present state. In order to refine theories and models describing the formation and evolution of Venus and its atmosphere, to characterize the escape of D atoms from the upper atmosphere and to provide a robust explanation to the problem of the origin of water on Venus, high resolution vertically resolved measurements of H2O and HDO and their temporal variations are needed. As illustrated in Figure 1, SOIR is able to measure both isotopologues of water simultaneously during the same occultation.

Vertical distributions of H2O and HDO local density for 8 orbits: 5 consecutive orbits for MTP09 and 3 consecutive orbits for MTP016.

Fig. 1: Vertical distributions of H2O and HDO local density for 8 orbits: 5 consecutive orbits for MTP09 and 3 consecutive orbits for MTP016. (credits : BISA)

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Relevant Publications

A warm layer in Venus’ cryosphere and high-altitude measurements of HF, HCl, H2O and HDO (pdf - 384 KB)
HDO and H2O vertical distributions and isotopic ratio in the Venus mesosphere by SOIR spectrometer on board Venus Express (pdf - 995 KB)
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