Enhanced Tropospheric Wave Forcing of Two Anticyclones in the Prephase of the January 2009 Major Stratospheric Sudden Warming Event

Publication type:
Journal article
Metadata:
Autoren
  • Andrea Schneidereit
  • Dieter HW Peters
  • Christian M Grams
  • Julian F Quinting
  • Julia H Keller
  • Gabriel Wolf
  • Franziska Teubler
  • Michael Riemer
  • Olivia Martius
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000404870300002&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.1175/MWR-D-16-0242.1
eISSN
1520-0493
Externe Identifier
  • Clarivate Analytics Document Solution ID: EZ7AA
ISSN
0027-0644
Ausgabe der Veröffentlichung
5
Zeitschrift
MONTHLY WEATHER REVIEW
Paginierung
1797 - 1815
Datum der Veröffentlichung
2017
Status
Published
Titel
Enhanced Tropospheric Wave Forcing of Two Anticyclones in the Prephase of the January 2009 Major Stratospheric Sudden Warming Event
Sub types
  • Article
Ausgabe der Zeitschrift
145

Data source: Web of Science (Lite)

Other metadata sources:
Abstract
<jats:title>Abstract</jats:title> <jats:p>Tropospheric forcing of planetary wavenumber 2 is examined in the prephase of the major stratospheric sudden warming event in January 2009 (MSSW 2009). Because of a huge increase in Eliassen–Palm fluxes induced mainly by wavenumber 2, easterly angular momentum is transported into the Arctic stratosphere, deposited, and then decelerates the polar night jet. In agreement with earlier studies, the results reveal that the strongest eddy heat fluxes, associated with wavenumber 2, occur at 100 hPa during the prephase of MSSW 2009 in ERA-Interim. In addition, moderate conditions of the cold phase of ENSO (La Niña) contribute to the eddy heat flux anomaly. It is shown that enhanced tropospheric wave forcing over Alaska and Scandinavia is caused by tropical processes in two ways. First, in a climatological sense, La Niña contributes to an enhanced anticyclonic flow over both regions. Second, the Madden–Julian oscillation (MJO) has an indirect influence on the Alaskan ridge by enhancing eddy activity over the North Pacific. This is manifested in an increase in cyclone frequency and associated warm conveyor belt outflow, which contribute to the maintenance and amplification of the Alaskan anticyclone. The Scandinavian ridge is maintained by wave trains emanating from the Alaskan ridge propagating eastward, including an enhanced transport of eddy kinetic energy. The MSSW 2009 is an extraordinary case of how a beneficial phasing of La Niña and MJO conditions together with multiscale interactions enhances tropospheric forcing for wavenumber 2–induced zonal mean eddy heat flux in the lower stratosphere.</jats:p>
Autoren
  • Andrea Schneidereit
  • Dieter HW Peters
  • Christian M Grams
  • Julian F Quinting
  • Julia H Keller
  • Gabriel Wolf
  • Franziska Teubler
  • Michael Riemer
  • Olivia Martius
DOI
10.1175/mwr-d-16-0242.1
eISSN
1520-0493
ISSN
0027-0644
Ausgabe der Veröffentlichung
5
Zeitschrift
Monthly Weather Review
Sprache
en
Online publication date
2017
Paginierung
1797 - 1815
Datum der Veröffentlichung
2017
Status
Published
Herausgeber
American Meteorological Society
Herausgeber URL
http://dx.doi.org/10.1175/mwr-d-16-0242.1
Datum der Datenerfassung
2020
Titel
Enhanced Tropospheric Wave Forcing of Two Anticyclones in the Prephase of the January 2009 Major Stratospheric Sudden Warming Event
Ausgabe der Zeitschrift
145

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