Inadvertent Localized Intensification of Precipitation by Aircraft

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Moiseev , D , Lautaportti , S , Alku , L , Tabakova , K , O'Connor , E , Leskinen , M & Kulmala , M 2019 , ' Inadvertent Localized Intensification of Precipitation by Aircraft ' , Journal of Geophysical Research : Atmospheres , vol. 124 , no. 4 , pp. 2094-2104 . https://doi.org/10.1029/2018JD029449

Title: Inadvertent Localized Intensification of Precipitation by Aircraft
Author: Moiseev, Dmitry; Lautaportti, Susanna; Alku, Laura; Tabakova, Ksenia; O'Connor, Ewan; Leskinen, Matti; Kulmala, Markku
Other contributor: University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Radar Meteorology group
University of Helsinki, INAR Physics
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)



Date: 2019-02-27
Language: eng
Number of pages: 11
Belongs to series: Journal of Geophysical Research : Atmospheres
ISSN: 2169-8996
DOI: https://doi.org/10.1029/2018JD029449
URI: http://hdl.handle.net/10138/304952
Abstract: Abstract: Eleven years of dual-polarization weather radar data, complemented by satellite and lidar observations, were used to investigate the origin of areas of localized intensification of precipitation spotted in the vicinity of Helsinki-Vantaa airport. It was observed that existing precipitation is enhanced locally on spatial scales from a few kilometers to several tens of kilometers. The precipitation intensity in these localized areas was 6-14 times higher than the background large-scale precipitation rate. Surface observations and dual-polarization radar data indicate that snowflakes within the ice portion of the falling precipitation in the intensification regions are larger and more isotropic than in the surrounding precipitation. There appears to be an increase in the ice particle number concentration within the intensification region. The observed events were linked to arriving or departing air traffic. We advocate that the mechanism responsible for intensification is aircraft-produced ice particles boosting the aggregation growth of snowflakes. Plain Language Summary: By analyzing 11 years of dual-polarization weather radar observations in the Helsinki region, we have discovered that airplanes landing in or departing from the Helsinki-Vantaa airport could locally increase precipitation rate by as much as 14 times. The observed phenomenon is related to the hole-punch clouds, which are also forming with the help of airplanes. The reported observations allow us to have a better understanding of precipitation formation processes that take place in ice and mixed phase clouds. They show that falling ice crystals from upper clouds could seed lower clouds and therefore increase rain or snowfall intensity through the process called snowflake aggregation. During snowflake aggregation bigger faster falling particles are formed by ice particles colliding and sticking together.
Subject: 1172 Environmental sciences
PRECIPITATION
MIXED-PHASE CLOUDS
HOLE PUNCH CLOUDS
SNOWFALL
DUAL-POLARIZATION RADAR
114 Physical sciences
1171 Geosciences
precipitation
mixed-phase clouds
hole punch clouds
snowfall
dual-polarization radar
ICE PARTICLES APIPS
SUPERCOOLED CLOUDS
POLARIMETRIC RADAR
HOLE-PUNCH
SNOW
AGGREGATION
DISDROMETER
CRYSTALS
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