English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the zaia usage as premium feature

ZAIA

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the access of premium content as premium feature

Premium Content

Zendy Tools

Zendy Open

We extracted a Martian water-ice cloud climatology from OMEGA data covering 7Martian years (MY 26-32). We derived two products, the Reversed Ice Cloud Index(ICIR) and the Percentage of Cloudy Pixels (PCP), indicating the mean cloudthickness and nebulosity over a regular grid (1{\deg} longitude x 1{\deg}latitude x 1{\deg} Ls x 1 h Local Time). The ICIR has been shown to be a proxyof the water-ice column derived from the Mars Climate Database. The PCPconfirms the location of the main cloud structures mapped with the ICIR, andgives a more accurate image of the cloud cover. We observed a denser cloudcoverage over Hellas Planitia, Lunae Planum and over large volcanoes in theaphelion belt. For the first time, thanks to the fact that Mars Express is notin Sun-synchronous orbit, we can explore the cloud diurnal cycle at a givenseason by combining 7 years of observations. However, because of the eccentricorbit, the temporal coverage remains limited. Other limitations of the datasetare its small size, the difficult distinction between ice clouds and frosts,and the impact of surface albedo on data uncertainty. We could neverthelessstudy the diurnal cloud life cycle by averaging the data over larger regions:from specific topographic features (covering a few degrees in longitude andlatitude) up to large climatic bands (all longitudes). We found that in thetropics around northern summer solstice, the diurnal thermal tide modulates theabundance of clouds, which is reduced around noon. At northern midlatitudes,clouds corresponding to the edge of the north polar hood are observed mainly inthe morning and around noon during northern winter (Ls=260-30{\deg}). OverChryse Planitia, low lying morning fogs dissipate earlier and earlier in theafternoon during northern winter. Over Argyre, clouds are present over alldaytime during two periods, around Ls = 30 and 160{\deg}.

Martian cloud climatology and life cycle extracted from Mars Express OMEGA spectral images