The effect of marine ice-nucleating particles on mixed-phase clouds

Show simple item record Raatikainen, Tomi Prank, Marje Ahola, Jaakko Kokkola, Harri Tonttila, Juha Romakkaniemi, Sami 2022-05-09T08:08:04Z 2022-05-09T08:08:04Z 2022
dc.description.abstract Shallow marine mixed-phase clouds are important for the Earth’s radiative balance, but modelling their formation and dynamics is challenging. These clouds depend on boundary layer turbulence and cloud top radiative cooling, which is related to the cloud phase. The fraction of frozen droplets depends on the availability of suitable ice-nucleating particles (INPs), which initiate droplet freezing. While mineral dust is the dominating INP type in most regions, high-latitude boundary layer clouds can be dependent on local marine INP emissions, which are often related to biogenic sources including phytoplankton. Here we use high resolution large eddy simulations to examine the potential effects of marine emissions on boundary layer INP concentrations and their effects on clouds. Surface emissions have a direct effect on INP concentration in a typical well-mixed boundary layer whereas a steep inversion can block the import of background INPs from the free troposphere. The importance of the marine source depends on the background INP concentration, so that marine INP emissions become more important with lower background INP concentrations. For the INP budget it is also important to account for INP recycling. Finally, with the high-resolution model we show how ice nucleation hotspots and high INP concentrations are focused on updraught regions. Our results show that marine INP emissions contribute directly to the boundary layer INP budget and therefore have an influence on mixed-phase clouds.
dc.language.iso en
dc.publisher Copernicus Publ.
dc.relation.ispartofseries Atmospheric chemistry and physics
dc.rights CC BY 4.0
dc.subject ice-nucleating particles (INPs)
dc.subject marine mixed-phase clouds
dc.subject radiative balance
dc.subject modelling
dc.title The effect of marine ice-nucleating particles on mixed-phase clouds
dc.format.volume 22
dc.format.issue 6
dc.identifier.urn URN:NBN:fi-fe2022050332140
dc.contributor.organization Ilmatieteen laitos fi
dc.contributor.organization Finnish Meteorological Institute en
dc.format.pagerange 3763-3778
dc.relation.doi 10.5194/acp-22-3763-2022
dc.relation.issn 1680-7316
dc.relation.issn 1680-7324
dc.type.okm A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.type.okm A1 Journal article (refereed), original research en

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