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<\/p>\nA new analysis of nearly 1,000 ice grain measurements from Saturn\u2019s E ring shows that Enceladus\u2019 salty ocean spray freezes and fragments in a more complex way than planetary scientists previously thought.<\/p>\n
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Type 3 ice particles are a major compositional group within Enceladus\u2019 plume and Saturn\u2019s E ring and are thought to represent frozen micrometer-sized aerosolized droplets of Enceladus\u2019 salty subsurface ocean. Image credit: NASA \/ JPL-Caltech.<\/p>\n
\u201cEnceladus\u2019 global ocean lies under an ice crust and above a rocky core where tidal dissipation is suspected to drive hydrothermal activity,\u201d said Dr. Frank Postberg from Freie Universit\u00e4t Berlin and his colleagues.<\/p>\n
\u201cBy cryovolcanic activity, the moon ejects icy particles into Saturn\u2019s E ring, which therefore is composed of micrometer- and submicrometer-sized icy dust particles that are sourced from Enceladus\u2019 subsurface ocean.\u201d<\/p>\n
\u201cFrom 2004 until 2017, the Cosmic Dust Analyzer (CDA) aboard the NASA\/ESA Cassini-Huygens spacecraft recorded the individual compositions of these ice grains with its impact ionization mass spectrometer.\u201d<\/p>\n
\u201cThe analysis of E ring grains by the CDA provides important insights into the composition of the subsurface ocean, with much better statistics compared to data from the rare and short occasions when Cassini traversed the plume,\u201d they added.<\/p>\n
\u201cPrevious analysis of CDA E ring spectra classified these ice grains into three basic compositional groups: Type 1 ice grains are almost pure water ice grains and show spectral features corresponding to water and sub-parts per million (ppm) amounts of sodium salts; Type 2 ice grains show spectral features corresponding to organics in these grains; and Type 3 ice grains are salt-rich ice grains indicating markedly increased salinity.\u201d<\/p>\n
In the new study, the researchers examined the spectral data collected by the CDA instrument from 961 Type 3 ice grains.<\/p>\n
Rather than finding a uniform salty composition, they identified at least five distinct chemical subtypes, dominated variously by sodium chloride, sodium carbonate\/bicarbonate, sodium phosphate, sodium hydroxide, or potassium salts.<\/p>\n
\u201cEnceladus actually does a lot of the work for us in preparing samples for analysis that usually take a lot of effort in chemical labs on Earth,\u201d Dr. Postberg said.<\/p>\n
\u201cThe oceanic constituents are separated from each other and simultaneously concentrated into individual ice particles.\u201d<\/p>\n
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Saturn\u2019s moon Enceladus with a plume. Image credit: NASA \/ JPL-Caltech \/ SSI \/ Kevin M. Gill.<\/p>\n
To explain this segregation, the scientists froze lab-made droplets of simulated Enceladus ocean water at controlled rates, then mapped the resulting salt distribution.<\/p>\n
They found that slow freezing (below about 20 K per minute) in relatively large droplets \u2014 tens to hundreds of micrometers across \u2014 causes different salts to crystallize separately, much larger than the roughly 1-2 micrometer ice grains actually detected in the plume.<\/p>\n
Thermodynamic modeling of the freezing process supported this pattern, showing that phosphates, carbonates, and chlorides precipitate at markedly different temperatures.<\/p>\n
This means Enceladus\u2019 plume grains likely form through a two-stage process: larger salty droplets first freeze slowly inside icy vents beneath the moon\u2019s surface, segregating their mineral content, and are only later shattered into the smaller, chemically pure fragments observed by Cassini.<\/p>\n
The findings suggest that sampling individual ice grains \u2014 rather than analyzing bulk plume material \u2014 will be essential for future missions seeking to understand the chemistry, and potential habitability, of Enceladus\u2019s hidden ocean.<\/p>\n
\u201cThat is great news in the search for life,\u201d Dr. Postberg said.<\/p>\n
\u201cFuture spacecrafts will have to analyze many individual ice particles in the plume.\u201d<\/p>\n
\u201cBut if they come across one with microbial material in it, they could identify biosignatures in the particle relatively easy with already available technology.\u201d<\/p>\n