Observations of the mesospheric semi-annual oscillation (MSAO) in water vapour by Odin/SMR

Mesospheric water vapour measurements taken by the SMR instrument aboard the Odin satellite between 2002 and 2006 have been analysed with focus on the mesospheric semi-annual circulation in the tropical and subtropical region. This analysis provides the first complete picture of mesospheric SAO in water vapour, covering altitudes above 80 km where previous studies were limited. Our analysis shows a clear semi- annual variation in the water vapour distribution in the entire altitude range between 65 km and 100 km in the equatorial area. Maxima occur near the equinoxes below 75 km and around the solstices above 80 km. The phase reversal occurs in the small layer in-between, consistent with the downward propagation of the mesospheric SAO in the zonal wind in this altitude range. The SAO amplitude exhibits a double peak structure in the equatorial region, with maxima at about 75 km and 81 km. The observed amplitudes show higher values than an earlier analysis based on UARS/HALOE data. The upper peak amplitude remains relatively constant with latitude. The lower peak amplitude decreases towards higher latitudes, but recovers in the Southern Hemisphere subtropics. On the other hand, the annual variation is much more prominent in the Northern Hemisphere subtropics. Furthermore, higher volume mixing ratios during summer and lower values during winter are observed in the Northern Hemisphere subtropics, as compared to the corresponding latitude range in the Southern Hemisphere.

[1]  P Baron,et al.  Simultaneous retrievals of temperature and volume mixing ratio constituents from nonoxygen odin submillimeter radiometer bands. , 2001, Applied optics.

[2]  C. Torrence,et al.  A Practical Guide to Wavelet Analysis. , 1998 .

[3]  Rolando R. Garcia,et al.  Simulation of secular trends in the middle atmosphere, 1950–2003 , 2007 .

[4]  J. Tuovinen,et al.  The Odin satellite - I. Radiometer design and test , 2003 .

[5]  J. Gumbel,et al.  Evidence for interhemispheric stratosphere‐mesosphere coupling derived from noctilucent cloud properties , 2007 .

[6]  C. McLandress.  Seasonal variability of the diurnal tide: Results from the Canadian middle atmosphere general circulation model , 1997 .

[7]  T. Dunkerton.  On the role of the Kelvin wave in the westerly phase of the semiannual zonal wind oscillation , 1979 .

[8]  James M. Russell,et al.  The Halogen Occultation Experiment , 1993 .

[9]  Iwao Hosako,et al.  Pressure broadening coefficients of the water vapor lines at 556.936 and 752.033 GHz , 2008 .

[10]  Peter H. Siegel,et al.  The Earth observing system microwave limb sounder (EOS MLS) on the aura Satellite , 2006, IEEE Transactions on Geoscience and Remote Sensing.

[11]  W. Meyer.  A Diagnostic Numerical Study of the Semiannual Variation of the Zonal Wind in the Tropical Stratosphere and Mesosphere , 1970 .

[12]  T. Dunkerton,et al.  Seasonal Variation of the Semiannual Oscillation , 1988 .

[13]  James M. Russell,et al.  Seasonal Cycles and QBO Variations in Stratospheric CH4 and H2O Observed in UARS HALOE Data , 1998 .

[14]  D. G. Dartt.  Semiannual Variation in Zonal Wind from 20 to 65 Kilometers , 1973 .

[15]  J. Russell,et al.  The semi‐annual oscillation in upper stratospheric and mesospheric water vapour as observed by HALOE , 1998 .

[16]  I. Hirota.  Observational evidence of the semiannual oscillation in the tropical middle atmosphere—A review , 1980 .

[17]  W. Skinner,et al.  Long-term variability in the solar diurnal tide observed by HRDI and simulated by the GSWM , 1995 .

[18]  R. J. Reed,et al.  The Circulation of the Tropical Stratosphere in the Years 1954–1960 , 1962 .

[19]  J. Russell,et al.  Stratospheric and mesospheric temperature variations for the quasi-biennial and semiannual (QBO and SAO) oscillations based on measurements from SABER (TIMED) and MLS (UARS) , 2006 .

[20]  W. V. Snyder,et al.  Validation of the Aura Microwave Limb Sounder middle atmosphere water vapor and nitrous oxide measurements , 2007 .

[21]  R. Garcia,et al.  The Role of Equatorial Waves Forced by Convection in the Tropical Semiannual Oscillation , 1997 .

[22]  R. P. Lowe,et al.  Atmospheric Chemistry Experiment (ACE): Mission overview. , 2005 .

[23]  C. Hines,et al.  The gravity wave Doppler spread theory applied in a numerical spectral model of the middle atmosphere: 2. Equatorial oscillations , 1997 .

[24]  D. Offermann,et al.  Global variability of mesospheric temperature : Mean temperature field , 2004 .

[25]  G. R. Sonnemann,et al.  Global three-dimensional modeling of the water vapor concentration of the mesosphere-mesopause region and implications with respect to the noctilucent cloud region , 2001 .

[26]  D. Murtagh,et al.  Critical parameters for the retrieval of mesospheric water vapour and temperature from Odin/SMR limb measurements at 557 GHz , 2007 .

[27]  Ian Powell,et al.  WINDII, the wind imaging interferometer on the Upper Atmosphere Research Satellite , 1993 .

[28]  R. Wilson,et al.  Climatology of the SKYHI Troposphere–Stratosphere–Mesosphere General Circulation Model , 1995 .

[29]  D. Murtagh,et al.  An overview of the Odin atmospheric mission , 2002 .

[30]  R. Bevilacqua,et al.  The seasonal variation of water vapor and ozone in the upper mesosphere: Implications for vertical transport and ozone photochemistry , 1990 .

[31]  C. Leovy,et al.  Evolution of the Zonal Mean State in the Equatorial Middle Atmosphere during October 1978-May 1979 , 1986 .

[32]  T. Shepherd,et al.  Inter-hemispheric mesospheric coupling in a comprehensive middle atmosphere model , 2009 .

[33]  T. Dunkerton.  Theory of the Mesopause Semiannual Oscillation , 1982 .

[34]  Rolando R. Garcia,et al.  Climatology of the semiannual oscillation of the tropical middle atmosphere , 1997 .

[35]  A. Ebel,et al.  A THREE-DIMENSIONAL DYNAMIC MODEL OF THE MINOR CONSTITUENTS OF THE MESOSPHERE , 1998 .

[36]  K. Hamilton.  Rocketsonde observations of the mesospheric semiannual oscillation at Kwajalein , 1982 .

[37]  Michael Olberg,et al.  The Odin satellite - II. Radiometer data processing and calibration , 2003 .

[38]  Kevin Hamilton,et al.  The quasi‐biennial oscillation , 2001 .

[39]  R. H. Hopkins.  Evidence of Polar-Tropical Coupling in Upper Stratospheric Zonal Wind Anomalies , 1975 .

[40]  G. Groves.  Annual and semi-annual zonal wind components and corresponding temperature and density variations, 60–130 km , 1972 .

[41]  J. Russell,et al.  The Seasonal and Long Term Changes in Mesospheric Water Vapor , 1997 .

[42]  R. Bevilacqua,et al.  Measurements of water vapor in the middle atmosphere and implications for mesospheric transport , 1996 .

[43]  Evon M. O. Abu-Taieh,et al.  Comparative Study , 2020, Definitions.

[44]  J. Lelieveld,et al.  Stratospheric dryness: model simulations and satellite observations , 2007 .

[45]  R. Lindzen,et al.  Atmospheric Tides: Thermal and Gravitational , 1969 .

[46]  J. Holton,et al.  A numerical model of the zonal mean circulation of the middle atmosphere , 1980 .

[47]  Peter F. Bernath,et al.  Atmospheric chemistry experiment (ACE): mission overview , 2004, SPIE Optics + Photonics.

[48]  R. J. Reed.  Zonal wind behavior in the equatorial stratosphere and lower mesosphere , 1966 .

[49]  E. Dupuy,et al.  Global observations of middle atmospheric water vapour by the Odin satellite: An overview. , 2007 .

[50]  P. Mote,et al.  Tropical stratospheric water vapor measured by the microwave limb sounder (MLS) , 1995 .

[51]  P. Bernath,et al.  Validation of water vapour profiles from the Atmospheric Chemistry Experiment (ACE) , 2008 .

[52]  G. Siebes,et al.  The Upper Atmosphere Research Satellite microwave limb sounder instrument , 1993 .

[53]  Clive D Rodgers,et al.  Inverse Methods for Atmospheric Sounding: Theory and Practice , 2000 .

[54]  Charles L. Croskey,et al.  Mesospheric water vapor measurements from Penn State: Monthly mean observations (1984–1987) , 1989 .

[55]  M. Rapp,et al.  High Rossby‐wave activity in austral winter 2002: Modulation of the general circulation of the MLT during the MaCWAVE/MIDAS northern summer program , 2004 .

[56]  P. Bernath,et al.  Retrievals for the atmospheric chemistry experiment Fourier-transform spectrometer. , 2005, Applied optics.

[57]  David Hinkley,et al.  Bootstrap Methods: Another Look at the Jackknife , 2008 .

[58]  David W. Rusch,et al.  Temperature minima in the average thermal structure of the middle mesosphere (70–80 km) from analysis of 40‐ to 92‐km SME global temperature profiles , 1994 .

[59]  W. L. Webb.  Structure of the Stratosphere and Mesosphere , 1966 .

[60]  T. Tsuda,et al.  A comparative study of mesospheric solar tides observed at Adelaide and Kyoto , 1988 .

[61]  E. Becker,et al.  Enhanced gravity-wave activity and interhemispheric coupling during the MaCWAVE/MIDAS northern summer program 2002 , 2006 .

[62]  E. Ray,et al.  An analysis of the structure and forcing of the equatorial semiannual oscillation in zonal wind , 1998 .

[63]  E. Remsberg,et al.  Seasonal and longer-term variations in middle atmosphere temperature from HALOE on UARS , 2002 .

[64]  C. Leovy,et al.  Estimation of the Kelvin Wave Contribution to the Semiannual oscillation. , 1988 .