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A new classification of the Arctic spring transition in the middle atmosphere

Matthias, Vivien and Stober, G. and Kozlovsky, Alexander and Lester, M. and Belova, Evgenia and Kero, Johan (2021) A new classification of the Arctic spring transition in the middle atmosphere. vEGU 2021, 26.-30.04.2021, virtuell.

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Abstract

In the middle atmosphere, spanning the stratosphere and mesosphere, spring transition is the time period where the zonal circulation reverses from winter westerly to summer easterly which has a strong impact on the vertical wave propagation influencing the tropospheric and ionospheric variability. The spring transition 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. In most studies spring transitions are classified either by their timing of occurrence or by their vertical structure. However, all these studies focus exclusively on the stratosphere and can give only tendencies under which pre-winter conditions an early or late spring transition takes place and how it takes place. Here we classify the spring transitions regarding their vertical-temporal development beginning in January and spanning the whole middle atmosphere in the core region of the polar vortex. This leads to five classes where the timing of the SSW in the preceding winter and a downward propagating Northern Annular Mode (NAM) plays a crucial role. The results show distinctive differences between the five classes in the months before the spring transition especially in the mesosphere allowing a certain prediction for some of the five spring transition classes which would not be possible considering the stratosphere only.

Item URL in elib:https://elib.dlr.de/142282/
Document Type:Conference or Workshop Item (Speech)
Title:A new classification of the Arctic spring transition in the middle atmosphere
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Matthias, VivienVivien.Matthias (at) dlr.deUNSPECIFIED
Stober, G.gunter.stober (at) iap.unibe.chhttps://orcid.org/0000-0002-7909-6345
Kozlovsky, AlexanderSodankylä Geophysical Observatory, Finlandhttps://orcid.org/0000-0003-1468-7600
Lester, M.University 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:27 April 2021
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:spring transition, middle atmosphere
Event Title:vEGU 2021
Event Location:virtuell
Event Type:international Conference
Event Dates:26.-30.04.2021
Organizer:EGU
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:19 May 2021 14:08
Last Modified:19 May 2021 14:08

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