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Mesosphere and lower thermosphere zonal wind variations over low latitudes: Relation to local stratospheric zonal winds and global circulation anomalies

Kishore Kumar, G. and Kishore Kumar, K. and Singer, W. and Zülicke, C. and Gurubaran, S. and Baumgarten, Gerd and Ramkumar, G. and Sathishkumar, S. and Rapp, Markus (2014) Mesosphere and lower thermosphere zonal wind variations over low latitudes: Relation to local stratospheric zonal winds and global circulation anomalies. Journal of Geophysical Research: Atmospheres, 119 (10), pp. 5913-5927. Wiley. DOI: 10.1002/2014JD021610 ISSN 0148-0227

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Official URL: http://dx.doi.org/10.1002/2014JD021610

Abstract

Long-term observations from medium-frequency and meteor radars (1993–2012) and rocket soundings (1979–1990 and 2002–2007) are used to study mesosphere and lower thermosphere (MLT) zonal wind variations in relation to the stratospheric winds over northern low latitudes. The combined data set provides a complete height profile of amplitude of semiannual oscillation (SAO) up to 100 km, with an exception around 75–80 km. The SAO signal has maxima around 50 km and 82 km and a minimum around 65 km. The MLT zonal winds show remarkable interannual variability during northern hemispheric spring equinox and much less during fall equinox. Zonal wind mesospheric spring equinox enhancements (MSEE) appear with a periodicity of 2–3 years, suggesting a modulation by the quasi-biennial oscillation, which we identified with the strength of stratospheric westward winds. Out of 20 years of observations, the stratospheric westward winds are strong during 11 years (non-MSEE) and weak during 9 years. Six of these 9 years show large MLT winds (MSEE), and 3 years (1999, 2004, and 2006) show small MLT winds (missing MSEE). These unexpected small winds occur in years with global circulation anomalies associated with strong sudden stratospheric warmings and an early spring transition of zonal winds. With the proposed three MSEE classes, we take into account local and global forcing factors.

Item URL in elib:https://elib.dlr.de/89526/
Document Type:Article
Title:Mesosphere and lower thermosphere zonal wind variations over low latitudes: Relation to local stratospheric zonal winds and global circulation anomalies
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kishore Kumar, G.IAP, KühlungsbornUNSPECIFIED
Kishore Kumar, K.Space Physics Lab., Trivandrum, Kerala, IndiaUNSPECIFIED
Singer, W.IAP, KühlungsbornUNSPECIFIED
Zülicke, C.IAP, KühlungsbornUNSPECIFIED
Gurubaran, S.Indian Institut of Geomagnetism, Navi Mumbai, IndiaUNSPECIFIED
Baumgarten, GerdIAP, KühlungsbornUNSPECIFIED
Ramkumar, G.Space Physics Lab., Trivandrum, Kerala, IndiaUNSPECIFIED
Sathishkumar, S.Indian Institut of Geomagnetism, Tirunelveli, IndiaUNSPECIFIED
Rapp, MarkusDLR, IPAUNSPECIFIED
Date:2014
Journal or Publication Title:Journal of Geophysical Research: Atmospheres
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:119
DOI :10.1002/2014JD021610
Page Range:pp. 5913-5927
Publisher:Wiley
ISSN:0148-0227
Status:Published
Keywords:Mesosphäre, Thermosphäre, niedrige Breiten
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Raumflugbetrieb / Missionstechnologie, R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Deposited By: Volkert, Dr. Hans
Deposited On:10 Jul 2014 08:31
Last Modified:31 Jul 2019 19:46

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