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Related Experiment Video

Updated: Jun 30, 2026

Measurement of Aerosols Optical Thickness of the Atmosphere using the GLOBE Handheld Sun Photometer

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Deuterium on Venus: observations from Earth.

C de Bergh¹, B Bézard, T Owen

¹Département de Recherche Spatiale, Observatoire de Paris, Meudon, France.

Science (New York, N.Y.)

|February 1, 1991

Summary

Scientists detected deuterium-to-hydrogen (D/H) in Venus's atmosphere, confirming a 100-fold enrichment compared to Earth. This finding is crucial for understanding Venus's atmospheric evolution.

Keywords:

NASA Discipline Exobiology NASA Discipline Number 52-10 NASA Program Exobiology Non-NASA Center

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Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

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Area of Science:

Planetary Science
Atmospheric Science
Spectroscopy

Background:

The deuterium-to-hydrogen (D/H) ratio in Venus's atmosphere is a key indicator of its atmospheric evolution.
Previous measurements of the D/H ratio on Venus yielded conflicting results.

Purpose of the Study:

To accurately measure the D/H ratio in Venus's atmosphere using high-resolution spectroscopy.
To resolve discrepancies between previous in situ and remote sensing measurements of Venus's D/H ratio.

Main Methods:

Acquired a high-resolution spectrum of Venus's dark side in the 2.34–2.43 micrometer range.
Detected absorption lines of HDO (deuterium-substituted water) and H2O (water).
Sounded the Venusian atmosphere at altitudes between 32 and 42 kilometers.

Main Results:

The D/H ratio in Venus's atmosphere was determined to be 120 ± 40 times the terrestrial ratio.
This result unequivocally confirms in situ measurements from the Pioneer Venus mission.
The findings reconcile apparent conflicts with upper limits derived from International Ultraviolet Explorer spectra.

Conclusions:

The significant enrichment of D/H on Venus provides a fundamental constraint for models of its atmospheric evolution.
The study highlights the importance of high-resolution spectroscopy for atmospheric characterization.
Understanding the D/H ratio is critical for deciphering the history of water on Venus.