Investigated
Can models reproduce the cloud’s rapid elongation?
Short answer
Image: neoteo.com
Early mesoscale simulations reproduced the cold, supersaturated source region near Arsia Mons but not the cloud’s long tail. Newer modeling reports that adding homogeneous ice nucleation can reproduce distinctive cloud characteristics and may explain its rapid expansion, though the process was not directly observed and some features remain imperfectly matched.
The views on this question
Two lenses on the same evidence. Source weight and the primary source ratio show what each rests on.
Alternative
Source weight 55%A stricter reading treats the result as partial reproduction rather than a settled solution. The model initially explained the atmospheric trigger but missed the defining elongated tail, and the later success depends on adding an unusual microphysical pathway that is inferred rather than observed. On this view, the model demonstrates plausibility, not yet a uniquely verified account of the cloud’s three-hour expansion.
- The defining challenge is not merely forming a cold pocket near Arsia Mons; it is reproducing the rapidly expanding, more-than-1,000-km tail seen in observations.
- The initial model’s failure to reproduce the tail and cloud microphysics shows that standard orographic-cloud treatment was incomplete.
- Homogeneous nucleation requires extreme supersaturation and is presented as an unexpected or generally unlikely process under ordinary cloud-formation assumptions.
- The newer explanation remains a model-supported inference, with reported mismatches between modeled and observed cloud features.