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Long-term studies of mesosphere and lower-thermosphere summer length definitions based on mean zonal wind features observed for more than one solar cycle at middle and high latitudes in the Northern Hemisphere

Jaen, Juliana and Renkwitz, Toralf and Chau, Jorge L. and He, Maosheng and Hoffmann, Peter and Yamazaki, Yosuke and Jacobi, Christoph and Tsutsumi, Masaki and Matthias, Vivien and Hall, Chris (2022) Long-term studies of mesosphere and lower-thermosphere summer length definitions based on mean zonal wind features observed for more than one solar cycle at middle and high latitudes in the Northern Hemisphere. Annales Geophysicae, 40 (1), pp. 23-35. Copernicus Publications. doi: 10.5194/angeo-40-23-2022. ISSN 0992-7689.

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Official URL: https://angeo.copernicus.org/articles/40/23/2022/

Abstract

Specular meteor radars (SMRs) and partial reflection radars (PRRs) have been observing mesospheric winds for more than a solar cycle over Germany (∼ 54◦ N) and northern Norway (∼ 69◦ N). This work investigates the mesospheric mean zonal wind and the zonal mean geostrophic zonal wind from the Microwave Limb Sounder (MLS) over these two regions between 2004 and 2020. Our study focuses on the summer when strong planetary waves are absent and the stratospheric and tropospheric conditions are relatively stable. We establish two definitions of the summer length according to the zonal wind reversals: (1) the mesosphere and lower-thermosphere summer length (MLTSL) using SMR and PRR winds and (2) the mesosphere summer length (M-SL) using the PRR and MLS. Under both definitions, the summer begins around April and ends around middle September. The largest year-to-year variability is found in the summer beginning in both definitions, particularly at high latitudes, possibly due to the influence of the polar vortex. At high latitudes, the year 2004 has a longer summer length compared to the mean value for MLT-SL as well as 2012 for both definitions. The M-SL exhibits an increasing trend over the years, while MLT-SL does not have a well-defined trend. We explore a possible influence of solar activity as well as large-scale atmospheric influences (e.g., quasi-biennial oscillation (QBO), El Niño–Southern Oscillation (ENSO), major sudden stratospheric warming events). We complement our work with an extended time series of 31 years at middle latitudes using only PRR winds. In this case, the summer length shows a breakpoint, suggesting a non-uniform trend, and periods similar to those known for ENSO and QBO.

Item URL in elib:https://elib.dlr.de/185306/
Document Type:Article
Title:Long-term studies of mesosphere and lower-thermosphere summer length definitions based on mean zonal wind features observed for more than one solar cycle at middle and high latitudes in the Northern Hemisphere
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Jaen, JulianaLeibniz Institute of Atmospheric Physics, Kühlungsborn, GermanyUNSPECIFIEDUNSPECIFIED
Renkwitz, ToralfLeibniz Institute of Atmospheric Physics, Kühlungsborn, GermanyUNSPECIFIEDUNSPECIFIED
Chau, Jorge L.Leibniz Institute of Atmospheric Physics, Kühlungsborn, GermanyUNSPECIFIEDUNSPECIFIED
He, MaoshengLeibniz Institute of Atmospheric Physics, Kühlungsborn, GermanyUNSPECIFIEDUNSPECIFIED
Hoffmann, PeterLeibniz Institute of Atmospheric Physics, Kühlungsborn, GermanyUNSPECIFIEDUNSPECIFIED
Yamazaki, YosukeHelmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany,UNSPECIFIEDUNSPECIFIED
Jacobi, ChristophUniversity of Leipzig, Germanyhttps://orcid.org/0000-0002-7878-0110UNSPECIFIED
Tsutsumi, MasakiNational Institute of Polar Research, Tokyo, JapanUNSPECIFIEDUNSPECIFIED
Matthias, VivienUNSPECIFIEDhttps://orcid.org/0000-0003-1806-4507UNSPECIFIED
Hall, ChrisTromsø Geophysical Observatory, UiT – The Arctic University of Norway, 9037 Tromsø, NorwayUNSPECIFIEDUNSPECIFIED
Date:20 January 2022
Journal or Publication Title:Annales Geophysicae
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:40
DOI:10.5194/angeo-40-23-2022
Page Range:pp. 23-35
Publisher:Copernicus Publications
ISSN:0992-7689
Status:Published
Keywords:mesosphere, summer length, zonal wind
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: Wendt, Dr. Vivien
Deposited On:24 Feb 2022 10:51
Last Modified:24 Feb 2022 10:51

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