New Patterns in Mars’s Clouds Revealed by Volunteers

The paper shows several cloud maps, illustrating times and regions where many clouds were identified. The maps reveal several key cloud populations identified in data from the volunteers. The cloud populations include high-altitude CO2-ice clouds, clouds that form near the poles, and dusty-season water-ice clouds. The structure of the clouds follows the pattern of “thermal tides” in the atmosphere, which are global-scale oscillations in temperature. Where temperatures are lower than average, clouds are more common.