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Vertical structure of the Arctic spring transition in the middle atmosphere

Matthias, Vivien and Stober, Gunter and Kozlovsky, Alexander and Lester, Mark and Belova, Evgenia and Kero, Johan (2020) Vertical structure of the Arctic spring transition in the middle atmosphere. AGU Fall Meeting, 1.-17. Dez 2020, Virtuell / San Francisco, USA.

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Abstract

In the middle atmosphere, spring transition is the time period where the zonal circulation reverses from westerly in winter to easterly in summer which has a strong impact on the vertical wave propagation influencing the variability of the ionosphere. The spring transition itself can be rapid in form of a final sudden stratospheric warming (SSW, mainly dynamically driven) or slow (mainly radiatively driven) but also intermediate stages can occur. Many studies investigate the spring transition by first defining an onset day (e.g., the zonal mean zonal wind reversal at 10hPa and 60°N) and then dividing all available spring transitions into early and late occurring spring transitions. However, all these studies focus exclusively on the stratosphere and give only tendencies under which pre-winter conditions an early or late spring transition takes place and how it takes place (rapid or slow). Here we classify the spring transitions regarding their temporal development beginning in January of the same year and additionally regarding their vertical structure in the stratosphere and mesosphere in the core region of the polar vortex. This leads to five classes where the timing of the SSW as well as a downward propagating Northern Annular Mode (NAM) plays a crucial role. First we use MLS satellite data to describe the five classes for recent single years, and then we use MERRA2 reanalysis data for a composite analysis. The results show distinctive differences between the five classes in the months before the spring transition especially in the mesosphere. This allows a certain prediction at least for some of the five classes of spring transition. Additionally, some of the spring transitions have a very special vertical structure in the mesosphere theoretically filtering out every wave from the lower atmosphere. The impact of these spring transitions on the ionospheric variability is discussed.

Item URL in elib:https://elib.dlr.de/140012/
Document Type:Conference or Workshop Item (Poster)
Title:Vertical structure of the Arctic spring transition in the middle atmosphere
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Matthias, VivienVivien.Matthias (at) dlr.dehttps://orcid.org/0000-0003-1806-4507
Stober, Guntergunter.stober (at) iap.unibe.chhttps://orcid.org/0000-0002-7909-6345
Kozlovsky, AlexanderSodankylä Geophysical Observatory, Finlandhttps://orcid.org/0000-0003-1468-7600
Lester, MarkUniversity Leicester, United Kingdomhttps://orcid.org/0000-0001-7353-5549
Belova, EvgeniaSwedish Institute of Space Physics (IRF), Kiruna, SwedenUNSPECIFIED
Kero, JohanSwedish Institute of Space Physics (IRF), Kiruna, Swedenhttps://orcid.org/0000-0002-2177-6751
Date:8 December 2020
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Spring transition, Classification, middle atmosphere
Event Title:AGU Fall Meeting
Event Location:Virtuell / San Francisco, USA
Event Type:international Conference
Event Dates:1.-17. Dez 2020
Organizer:AGU
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Middle Atmosphere
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics > Solar-Terrestrial Coupling Processes
Deposited By: Matthias, Vivien
Deposited On:20 Jan 2021 14:08
Last Modified:20 Jan 2021 14:08

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