Inadvertent Localized Intensification of Precipitation by Aircraft

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Sammanfattning

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.

Originalspråkengelska
TidskriftJournal of Geophysical Research : Atmospheres
Volym124
Utgåva4
Sidor (från-till)2094-2104
Antal sidor11
ISSN2169-8996
DOI
StatusPublicerad - 27 feb 2019
MoE-publikationstypA1 Tidskriftsartikel-refererad

Vetenskapsgrenar

  • 1172 Miljövetenskap
  • 114 Fysik
  • 1171 Geovetenskaper

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@article{ea3069bb5d9b4c47baf242e4586d77ba,
title = "Inadvertent Localized Intensification of Precipitation by Aircraft",
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.",
keywords = "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",
author = "Dmitry Moiseev and Susanna Lautaportti and Laura Alku and Ksenia Tabakova and Ewan O'Connor and Matti Leskinen and Markku Kulmala",
year = "2019",
month = "2",
day = "27",
doi = "10.1029/2018JD029449",
language = "English",
volume = "124",
pages = "2094--2104",
journal = "Journal of Geophysical Research : Atmospheres",
issn = "2169-8996",
publisher = "American Geophysical Union",
number = "4",

}

Inadvertent Localized Intensification of Precipitation by Aircraft. / Moiseev, Dmitry; Lautaportti, Susanna; Alku, Laura; Tabakova, Ksenia; O'Connor, Ewan; Leskinen, Matti; Kulmala, Markku.

I: Journal of Geophysical Research : Atmospheres, Vol. 124, Nr. 4, 27.02.2019, s. 2094-2104.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

TY - JOUR

T1 - Inadvertent Localized Intensification of Precipitation by Aircraft

AU - Moiseev, Dmitry

AU - Lautaportti, Susanna

AU - Alku, Laura

AU - Tabakova, Ksenia

AU - O'Connor, Ewan

AU - Leskinen, Matti

AU - Kulmala, Markku

PY - 2019/2/27

Y1 - 2019/2/27

N2 - 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.

AB - 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.

KW - 1172 Environmental sciences

KW - PRECIPITATION

KW - MIXED-PHASE CLOUDS

KW - HOLE PUNCH CLOUDS

KW - SNOWFALL

KW - DUAL-POLARIZATION RADAR

KW - 114 Physical sciences

KW - 1171 Geosciences

KW - precipitation

KW - mixed-phase clouds

KW - hole punch clouds

KW - snowfall

KW - dual-polarization radar

KW - ICE PARTICLES APIPS

KW - SUPERCOOLED CLOUDS

KW - POLARIMETRIC RADAR

KW - HOLE-PUNCH

KW - SNOW

KW - AGGREGATION

KW - DISDROMETER

KW - CRYSTALS

U2 - 10.1029/2018JD029449

DO - 10.1029/2018JD029449

M3 - Article

VL - 124

SP - 2094

EP - 2104

JO - Journal of Geophysical Research : Atmospheres

JF - Journal of Geophysical Research : Atmospheres

SN - 2169-8996

IS - 4

ER -