Eastward‐Propagating Planetary Waves Prior to the January 2009 Sudden Stratospheric Warming

Eastward‐propagating planetary waves (EPWs) were investigated prior to the boreal January 2009 major sudden stratospheric warming (SSW) event simulated by the National Center for Atmospheric Research's Whole Atmosphere Community Climate Model with specified dynamics. About 22 days before SSW onset, a background flow with jet maxima around the upper polar stratosphere and subtropical mesosphere developed due to the net forcing by gravity and planetary waves. The mesospheric wind structure was largely unstable and supported a wave geometry conducive to overreflection. With a zonal phase speed of ∼10 m s−1, EPWs appeared near their turning and critical layers as wavenumber‐2 perturbations in the stratosphere and mesosphere. Accompanied by upward EPW activity from the lower stratosphere, EPW growth exhibited characteristics of wave instability and overreflection.

[1]  P. Espy,et al.  Climatological Westward‐Propagating Semidiurnal Tides and Their Composite Response to Sudden Stratospheric Warmings in SuperDARN and SD‐WACCM‐X , 2021, Journal of Geophysical Research: Atmospheres.

[2]  H. Chun,et al.  Role of Gravity Waves in a Vortex-Split Sudden Stratospheric Warming in January 2009 , 2020, Journal of the Atmospheric Sciences.

[3]  O. Martius,et al.  Rossby Wave Propagation into the Northern Hemisphere Stratosphere: The Role of Zonal Phase Speed , 2018 .

[4]  M. Ern,et al.  On the origin of the mesospheric quasi-stationary planetary waves in the unusual Arctic winter 2015/2016 , 2017 .

[5]  Bin Zhao,et al.  The Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2). , 2017, Journal of climate.

[6]  Rolando R. Garcia,et al.  On the composite response of the MLT to major sudden stratospheric warming events with elevated stratopause , 2016 .

[7]  E. Sutton,et al.  Short‐term nonmigrating tide variability in the mesosphere, thermosphere, and ionosphere , 2016 .

[8]  F. Sassi,et al.  Traveling planetary‐scale waves in the lower thermosphere: Effects on neutral density and composition during solar minimum conditions , 2016 .

[9]  Kaoru Sato,et al.  Gravity Wave–Induced Anomalous Potential Vorticity Gradient Generating Planetary Waves in the Winter Mesosphere , 2015 .

[10]  Amy H. Butler,et al.  Defining Sudden Stratospheric Warmings , 2015 .

[11]  T. Birner,et al.  Vortex Preconditioning due to Planetary and Gravity Waves prior to Sudden Stratospheric Warmings , 2014 .

[12]  D. Kinnison,et al.  Observations of gravity wave forcing of the mesopause region during the January 2013 major Sudden Stratospheric Warming , 2014, 1607.00783.

[13]  T. Hirooka,et al.  Circulation changes in the stratosphere and mesosphere during the stratospheric sudden warming event in January 2009 , 2014 .

[14]  Daniel R. Marsh,et al.  Climate change from 1850 to 2005 simulated in CESM1(WACCM) , 2013 .

[15]  J. Richter,et al.  The roles of planetary and gravity waves during a major stratospheric sudden warming as characterized in WACCM , 2012 .

[16]  K. Hoppel,et al.  Mesospheric Precursors to the Major Stratospheric Sudden Warming of 2009: Validation and Dynamical Attribution Using a Ground‐to‐Edge‐of‐Space Data Assimilation System , 2011 .

[17]  Toshihiko Hirooka,et al.  A Major Stratospheric Sudden Warming Event in January 2009 , 2010 .

[18]  A. Coster,et al.  Unexpected connections between the stratosphere and ionosphere , 2010 .

[19]  R. Garcia,et al.  Toward a Physically Based Gravity Wave Source Parameterization in a General Circulation Model , 2010 .

[20]  James M. Russell,et al.  The evolution of the stratopause during the 2006 major warming: Satellite data and assimilated meteorological analyses , 2008 .

[21]  N. Harnik,et al.  Relating Overreflection and Wave Geometry to the Counterpropagating Rossby Wave Perspective: Toward a Deeper Mechanistic Understanding of Shear Instability , 2007 .

[22]  A. Carswell,et al.  The Gravity Wave Arctic Stratospheric Vortex Interaction. , 2001 .

[23]  Mark P. Baldwin,et al.  Stratospheric Harbingers of Anomalous Weather Regimes , 2001, Science.

[24]  Y. Orsolini,et al.  Idealized Life Cycles of Planetary-Scale Barotropic Waves in the Middle Atmosphere , 1995 .

[25]  Murry L. Salby,et al.  Fundamentals of atmospheric physics , 1995 .

[26]  John C. Gille,et al.  Gravity Wave Variance in LIMS Temperatures. Part I: Variability and Comparison with Background Winds , 1994 .

[27]  G. Brasseur,et al.  The Separated Polar Winter Stratopause: A Gravity Wave Driven Climatological Feature , 1989 .

[28]  G. Manney,et al.  Barotropic stability of realistic stratospheric jets , 1988 .

[29]  R. Lindzen.  Instability of plane parallel shear flow (toward a mechanistic picture of how it works) , 1988 .

[30]  Rolando R. Garcia,et al.  Photochemistry and transport of carbon monoxide in the middle atmosphere , 1985 .

[31]  D. Hartmann.  Barotropic Instability of the Polar Night Jet Stream , 1983 .

[32]  A. O'Neill,et al.  Stratospheric warmings diagnosed using the transformed Eulerian-mean equations and the effect of the mean state on wave propagation , 1982 .

[33]  B. Farrell,et al.  The Concept of Wave Overreflection and Its Application to Baroclinic Instability , 1980 .

[34]  P. Webster,et al.  Stratospheric Long Waves: Comparison of Thermal Structure in the Northern and Southern Hemispheres , 1976 .

[35]  R. Dickinson.  Baroclinic Instability of an Unbounded Zonal Shear Flow in a Compressible Atmosphere , 1973 .

[36]  T. Matsuno,et al.  A Dynamical Model of the Stratospheric Sudden Warming , 1971 .

[37]  C. Leovy.  Simple Models of Thermally Driven Mesopheric Circulation , 1964 .

[38]  Joseph Smagorinsky,et al.  The dynamical influence of large‐scale heat sources and sinks on the quasi‐stationary mean motions of the atmosphere , 1953 .

[39]  J. G. Charney,et al.  A Numerical Method for Predicting the Perturbations of the Middle Latitude Westerlies , 1949 .