#PolarIceCap hashtag - Bluesky

@ivojuri.bsky.social

1 year ago

https://www.nature.com/articles/s41467-025-56018-2

Fig. 1 |Activity at the northpolar region. a A north polar scarp region, centered at 83.8°N, 236.2°E, in 3D view with 3× vertical exaggeration. The yellow dashed lines delineate the boundaries of each geological unit. b Multi-temporal HiRISE images show an ice-fragment detaching from the NPLD scarp surface (left) and breaking into a cluster of ice blocks at the foot of the scarp (right). Downhill is towards the bottom. The location is outlined in a. Credit: background HiRISE image in a and b, NASA/JPL/University of Arizona.

Fig. 2 | Currently active NPLD scarps. a Erosion rate of 19 scarps (S1–S19) across the north polar region. Scarps (U1–U4) are observed to be active with ice block falls, but the limited number ofHiRISE images do not allowfor change detection on these scarps. The lengths of the studied scarp sections are limited by the size of available HiRISE images. Dune fields aremapped by pink dots15. The cavi and rupes outcrops are mapped with black and gray patterns, respectively39. For a detailed map of cavi outcrops, rupes outcrops and dune fields, which are located close to S1–S19, please refer to Supplementary Figs. 8–26. The background is a Mars MGS MOLA Global Shaded Relief46 map, in polar stereographic projection. b Retreat rates of the active and moderately active parts of the scarps.

$Fig. 3 | Time series of mass wasting detection on part of the S2, outlined in Fig. 2a. In the first image, the scarp is mapped into the active part (red) and the moderately active part (green) based on the fracturing level. The next five images are density maps of the detached ice-fragments at part of the S2, showing interannual results. Density is calculated as the number of detections in a circle with a radius of 100m. Note that there is no HiRISE data during the summer ofMars Year (MY) 33. Downhill is towards the top. The background image is the red-filter HiRISE image ESP_019047_2640_RED. Credit: background HiRISE image, NASA/JPL/University of Arizona.$

Fig. 3 | Time series of mass wasting detection on part of the S2, outlined in Fig. 2a. In the first image, the scarp is mapped into the active part (red) and the moderately active part (green) based on the fracturing level. The next five images are density maps of the detached ice-fragments at part of the S2, showing interannual results. Density is calculated as the number of detections in a circle with a radius of 100m. Note that there is no HiRISE data during the summer ofMars Year (MY) 33. Downhill is towards the top. The background image is the red-filter HiRISE image ESP_019047_2640_RED. Credit: background HiRISE image, NASA/JPL/University of Arizona.

Uncovering the secrets of Mars’ north polar ice cap 🔴❄️! New research on mass wasting reveals ongoing asymmetric retreat, offering fresh insights into the dynamics of Martian ice and its climate. 🌍🔬

#MarsResearch #PolarIceCap #MassWasting #PlanetaryScience #MarsExploration