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Conference Papers Year : 2019

Impacts of Organics-Rich and Porous Interplanetary Dust Particles in the Earth’s Atmosphere

Anny Chantal Levasseur-Regourd
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Alain Hauchecorne
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François Ravetta

Abstract

Advances in i) interpretation of local data on the near-ecliptic zodiacal light polarization [1], dynamical studies of interplanetary dust [2,3], and observations of zodiacal thermal emission [4] have progressively suggested that a significant fraction (possibly about 85% of the total mass influx of near-Earth zodiacal dust) originates from Jupiter-family comets (periods < 20 yrs, low inclinations, direct orbits), such as 67P/Churyumov-Gerasimenko (67P). Meanwhile, the Rosetta rendezvous mission with 67P has allowed us to establish that the dust particles ejected by the nucleus are hierarchical aggregates, with various sizes (mostly in the 10 to 200 mm range) and morphologies (from extremely porous to rather compact), and that they are composed of about as much, in mass, complex refractory organics than minerals [e.g. 5 and references within]. Cometary dust particles, progressively released in the interplanetary dust cloud, spiral towards the Sun under Poynting-Robertson drag. Their flux on Earth is estimated to be about (30± 20) x 106 kg/yr [6,7]. Their not-too-high relative velocity, together with their fluffiness, make it possible for many of them to survive atmospheric entry, cross the mesosphere, and be found in the stratosphere as CP-IDPs or on the Earth's surface as UCAMMS [5,8]. These conclusions will be discussed, in terms of a likely enrichment of the atmosphere in complex organics, as compared to, e.g. volcanic ashes, biomass burning, pollution, rocket exhaust, airplane soot [9], and of its early evolution during a possible LHB epoch. Finally, future studies within the Earth's atmosphere, together with new space missions, such as the Comet Interceptor, will be mentioned in the context of our study.
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insu-02361039 , version 1 (13-11-2019)

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Anny Chantal Levasseur-Regourd, Alain Hauchecorne, Jérémie Lasue, François Ravetta, Jean-Baptiste Renard. Impacts of Organics-Rich and Porous Interplanetary Dust Particles in the Earth’s Atmosphere. AGU Fall Meeting, Dec 2019, San Francisco, United States. pp.abstract #P21F-3433. ⟨insu-02361039⟩
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