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Mars climatology from viking 1 after 20 sols
Summary
Viking 1 lander meteorology data reveals consistent daily patterns in Martian temperature, wind, and pressure. A key finding is a continuous decrease in mean pressure, likely due to carbon dioxide deposition.
Area of Science:
- Planetary Science
- Atmospheric Science
- Meteorology
Background:
- The Viking 1 lander collected meteorological data on Mars.
- Understanding Martian atmospheric dynamics is crucial for planetary exploration.
Purpose of the Study:
- To analyze the initial 20 sols of meteorological data from the Viking 1 lander.
- To identify daily patterns and long-term trends in Martian temperature, wind, and pressure.
Main Methods:
- Harmonic analysis of 20-sol composite data for temperature, wind, and pressure.
- Analysis of diurnal and semidiurnal oscillations in atmospheric pressure.
Main Results:
- Consistent daily patterns observed in temperature, wind, and pressure.
- Maximum temperature: 241.8 K, Minimum temperature: 187.2 K.
- Mean diurnal wind speed: 2.4 m/s, prevailing from the south with counterclockwise rotation.
- Observed diurnal and semidiurnal pressure oscillations, with the latter attributed to solar tides.
- A significant secular decrease in diurnal mean pressure was detected.
Conclusions:
- Martian atmospheric patterns show high consistency over the initial 20 sols.
- The semidiurnal pressure oscillation is likely driven by solar tides.
- The observed pressure decrease is hypothesized to result from carbon dioxide deposition at the south polar cap.
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