Atmospheric Chemistry and Physics Discussions
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2007
10.5194/acpd-7-11685-2007
http://www.atmos-chem-phys-discuss.net/7/11685/2007/
http://www.atmos-chem-phys-discuss.net/7/11685/2007/acpd-7-11685-2007.html
http://www.atmos-chem-phys-discuss.net/7/11685/2007/acpd-7-11685-2007.pdf
11685
11723
2007-08-08
Equatorial wave analysis from SABER and ECMWF temperatures
M. Ern
m.ern@fz-juelich.de
P. Preusse
M. Krebsbach
M. G. Mlynczak
J. M. Russell III
Institute for Stratospheric Research (ICG-1), Forschungszentrum Juelich, Juelich, Germany
Atmospheric Sciences Division, NASA Langley Research Center, Hampton, VA, USA
Center for Atmospheric Sciences, Hampton University, Hampton, VA, USA
now at: Department of Physics, University of Wuppertal, Wuppertal, Germany
Equatorial planetary scale wave modes such as Kelvin waves or Rossby-gravity
waves are excited by convective processes in the troposphere.
In this paper an analysis for these and other equatorial
wave modes is carried out with special focus on the stratosphere
using temperature data from the SABER instrument as well as ECMWF
temperatures.
Space-time spectra of symmetric and antisymmetric spectral power
are derived to separate the different equatorial wave types and
the contribution of gravity waves is determined
from the spectral background of the space-time spectra.
<br><br>
Both gravity waves and equatorial planetary scale wave modes
are main drivers of the quasi-biennial oscillation (QBO)
in the stratosphere.
Temperature variances attributed to the different wave types
are calculated for the period
from February 2002 until March 2006 and
compared to previous findings.
A comparison between SABER and ECMWF wave analyses shows that
in the lower stratosphere SABER and ECMWF spectra and temperature variances
agree remarkably well
while in the upper stratosphere ECMWF tends to overestimate
Kelvin wave components.
Gravity wave variances are partly reproduced by ECMWF
but have a significant low-bias.
A case study for the time
period of the SCOUT-O3 tropical aircraft measurement campaign in
Darwin/Australia (in November and December 2005)
is performed and
we find that in the lower stratosphere also the longitude-time
distribution of the Kelvin waves is correctly reproduced by ECMWF.
Alexander, M. J., Holton, J. R., and Durran, D. R.: The gravity wave response above deep convection in a squall line simulation, J Atmos Sci., 52, 2212–2226, 1995.
Angell, J. K., Cotton, G. F., and Korshover, J.: A climatological analysis of oscillations of Kelvin wave period at 50 mb, J Atmos Sci., 30, 13–24, 1973.
Baldwin, M. P., Gray, L. J., Dunkerton, T. J., Hamilton, K., Haynes, P. H., Randel, W. J., Holton, J. R., Alexander, M. J., Hirota, I., Horinouchi, T., Jones, D. B. A., Kinnersley, J. S., Marquardt, C., Sato, K., and Takahashi, M.: The quasi-biennial oscillation, Rev. Geophys., 39, 179–229, 2001.
Bergman, J. W. and Salby, M. L.: Equatorial wave activity derived from fluctuations in observed convection, J Atmos Sci., 51, 3791–3806, 1994.
Canziani, P. O., Holton, J. R., Fishbein, E., Froidevaux, L., and Waters, J. W.: Equatorial Kelvin waves: A UARS MLS view, J Atmos Sci., 51, 3053–3076, 1994.
Canziani, P. O.: Slow and ultraslow equatorial Kelvin waves: The UARS CLAES view, Q. J. R. Meteorol. Soc., 125, 657–676, doi:10.1256/smsqj.55413, 1999.
Chang, C.-P.: Vertical structures of tropical waves maintained by internally-induced cumulus heating, J Atmos Sci., 33, 729–739, 1976.
Cho, H.–K., Bowman, K. P., and North, G. R.: Equatorial waves including the Madden–Julian Oscillation in TRMM rainfall and OLR data, J Climate, 17, 4387–4406, 2004
Coy, L. and Swinbank, R.: Characteristics of stratospheric winds and temperatures produced by data assimilation, J Geophys Res., 102, 25 763–25 781, 1997.
de la Torre, A., Schmidt, T., and Wickert, J.: A global analysis of wave potential energy in the lower stratosphere derived from 5 years of GPS radio occultation data with CHAMP, Geophys Res Lett., 33, L24809, doi:10.1029/2006GL027696, 2006.
Dunkerton, T. J.: The role of gravity waves in the quasi-biennial oscillation, J Geophys Res., 102, 26 053–26 076, 1997.
Eckermann, S D., and Preusse, P.: Global measurements of stratospheric mountain waves from space, Science, 286, 1534–1537, 1999.
Ern, M., Preusse, P., Alexander, M J., and Warner, C D.: Absolute values of gravity wave momentum flux derived from satellite data, J Geophys Res., 109, D20103, doi:10.1029/2004JD004752, 2004.
Ern, M., Preusse, P., and Warner, C D.: A comparison between CRISTA satellite data and Warner and McIntyre gravity wave parameterization scheme: Horizontal and vertical wavelength filtering of gravity wave momentum flux, Adv. Space Res., 35, 2017–2023, doi:10.1016/j.asr.2005.04.109, 2005.
Fulton, S. R. and Schubert, W. H.: Vertical normal mode transforms: Theory and application, Mon. Wea. Rev., 113, 647–658, 1985.
Garcia, R. R., Lieberman, R., Russell III, J. M., and Mlynczak, M. G.: Large-scale waves in the mesosphere and lower thermosphere observed by SABER, J. Atmos. Sci., 62, 4384–4399, 2005.
Hayashi, Y.: A method of estimating space-time spectra from polar-orbiting satellite data, J Atmos Sci., 37, 1385–1392, 1980.
Hitchman, M. H. and Leovy, C. B.: Estimation of the Kelvin wave contribution to the semiannual oscillation, J Atmos Sci., 45, 1462–1475, 1988.
Johnson, R. H. and Ciesielski, P. E.: Rainfall and radiative heating rates from TOGA COARE atmospheric budgets, J Atmos Sci., 57, 1497–1514, 2000.
Krebsbach, M. and Preusse, P.: Spectral analysis of gravity wave activity in SABER temperature data, Geophys Res Lett., 34, L03814, doi:10.1029/2006GL028040, 2006.
Lieberman, R. S. and Riggin, D.: High resolution Doppler imager observations of Kelvin waves in the equatorial mesosphere and lower thermosphere, J. Geophys. Res., 102, 26 117–26 130, 1997.
Lindzen, R. S.: The interaction of waves and convection in the tropics, J Atmos Sci., 60, 3009–3020, 2003.
Matsuno, T.: Quasi-geostrophic motions in the equatorial area, J. Meteorol. Soc. Jpn., 44, 25–43, 1966.
Mlynczak, M. G.: Energetics of the mesosphere and lower thermosphere and the SABER instrument, Adv. Space Res., 44, 1177–1183, 1997.
Pires, P., Redelsperger, J.-L., and Lafore, J.-P.: Equatorial atmospheric waves and their association to convection, Mon. Wea. Rev., 125, 1167–1184, 1997.
Preusse, P., Dörnbrack, A., Eckermann, S. D., Riese, M., Schaeler, B., Bacmeister, J. T., Broutman, D., and Grossmann, K. U.: Space based measurements of stratospheric mountain waves by CRISTA, 1. Sensitivity, analysis method and a case study, J. Geophys. Res., 107, 8178, doi:10.1029/2001JD000699, 2002.
Preusse, P., Ern, M., Eckermann, S. D., Warner, C. D., Picard, R. H., Knieling, P., Krebsbach, M., Russell III, J. M., Mlynczak, M. G., Mertens, C. J., and Riese, M.: Tropopause to mesopause gravity waves in August: Measurement and modeling, J Atmos. Sol.–Terr. Phys., 68, 1730–1751.
Randel, W. J., Boville, B. A., and Gille, J. C.: Observations of planetary mixed Rossby-gravity waves in the upper stratosphere, J. Atmos. Sci., 47, 3092–3099, 1990.
Randel, W. J. and Gille, J. C.: Kelvin wave activity in the upper stratosphere observed in SBUV ozone data, J. Atmos. Sci., 48, 2336–2349, 1991.
Randel, W. J. and Wu, F.: Kelvin wave variability near the equatorial tropopause observed in GPS radio occultation measurements, J. Geophys. Res., 110, D03102, doi:10.1029/2004JD005006, 2005.
Ratnam, M. V., Tsuda, T., Kozu, T., and Mori, S.: Long-term behavior of the Kelvin waves revealed by CHAMP/GPS RO measurements and their effects on the tropopause structure, Ann. Geophys., 24, 1355–1366, 2006.
Russell III, J. M., Mlynczak, M. G., Gordley, L. L., Tansock, J., and Esplin, R.: An overview of the SABER experiment and preliminary calibration results, Proceedings of SPIE, 3756, 277–288, 1999.
Salby, M. L.: Sampling theory for asynoptic satellite observations, Part I: Space-time spectra, resolution, and aliasing, J. Atmos. Sci., 39, 2577–2600, 1982.
Salby, M. L.: Sampling theory for asynoptic satellite observations, Part II: Fast Fourier synoptic mapping, J. Atmos. Sci., 39, 2601–2614, 1982.
Salby, M. L., Hartmann, D. L., Bailey, P. L., and Gille, J. C.: Evidence for equatorial Kelvin modes in Nimbus–7 LIMS, J. Atmos. Sci., 41, 220–235, 1984.
Salby, M. L., and Garcia, R. R.: Transient response to localized episodic heating in the tropics, Part I: Excitation and short-time near-field behavior, J. Atmos. Sci., 44, 458–498, 1987.
Salby, M. L., Matrosova, L., and Callaghan, P. F.: Global Kelvin waves in the upper atmosphere excited by tropospheric forcing at midlatitudes, J. Geophys. Res., 112, D06111, doi:10.1029/2006JD007235, 2007.
Sato, K., Hasegawa, F., and Hirota, I.: Short-period disturbances in the equatorial lower stratosphere, J. Meteorol. Soc. Jpn., 72, 859–873, 1994.
Semeniuk, K., and Shepherd, T. G.: Mechanisms for tropical upwelling in the stratosphere, J. Atmos. Sci., 58, 3097–3115, 2001.
Shiotani, M., Gille, J. C., and Roche, A. E.: Kelvin waves in the equatorial lower stratosphere as revealed by cryogenic limb etalon spectrometer temperature data, J. Geophys. Res., 102(D22), 26 131–26 140, 1997.
Shuckburgh, E., Norton, W., Iwi, A., and Haynes, P.: Influence of the quasi-biennial oscillation on isentropic transport and mixing in the tropics and subtropics, J. Geophys. Res., 106(D13), 14 327–14 337, 2001.
Smith, A. K., Preusse, P., and Oberheide, J.: Middle atmosphere Kelvin waves observed in Cryogenic Infrared Spectrometers and Telescopes for the Atmosphere (CRISTA) 1 and 2 temperature and trace species, J. Geophys. Res., 107(D23), 8177, doi:10.1029/2001JD000577, 2002.
Srikanth, R. and Ortland, D. A.: Analysis of Kelvin waves in High-Resolution Doppler Imager and Microwave Limb Sounder stratosphere measurements using a constrained least squares method, J. Geophys. Res., 103(D18), 23 131–23 151, 1998.
Straub, K. H. and Kiladis, G. N.: The observed structure of convectively coupled Kelvin waves: Comparison with simple models of coupled wave instability, J. Atmos. Sci., 60, 1655–1668, 2003.
Takahashi, H., Wrasse, C. M., Fechine, J., Pancheva, D., Abdu, M. A., Batista, I. S., Lima, L. M., Batista, P. P., Clemesha, B. R., Schuch, N. J., Shiokawa, K., Gobbi, D., Mlynczak, M. G., and Russell, J. M.: Signature of ultra fast Kelvin waves in the equatorial middle atmosphere and ionosphere, Geophys. Res. Lett., 34, L11108, doi:10.1029/2007GL029612, 2007.
Tindall, J. C., Thuburn, J., and Highwood, E. J.: Equatorial waves in the lower stratosphere. I: A novel detection method, Q. J. R. Meteorol. Soc., 132, 177–194, doi:10.1256/qj.04.152, 2006.
Tindall, J. C., Thuburn, J., and Highwood, E. J.: Equatorial waves in the lower stratosphere. II: Annual and interannual variability, Q. J. R. Meteorol. Soc., 132, 195–212, doi:10.1256/qj.04.153, 2006.
Tsai, H.-F., Tsuda, T., Hajj, G. A., Wickert, J., and Aoyama, Y.: Equatorial Kelvin waves observed with GPS occultation measurements (CHAMP and SAC-C), J. Meteorol. Soc. Jpn., 82, 397–406, 2004.
Wallace, M. W. and Kousky, V. E.: Observational evidence of Kelvin waves in the tropical stratosphere, J. Atmos. Sci., 25, 900–907, 1968.
Wheeler, M. and Kiladis, G. N.: Convectively coupled equatorial waves: Analysis of clouds and temperature in the wavenumber-frequency domain, J. Atmos. Sci., 56, 374–399, 1999.
Wu, D. L., Hays, P. B., and Skinner, W. R.: A least squares method for spectral analysis of space–time series, J. Atmos. Sci., 52, 3501–3511, 1995.
Wu, D. L., Preusse, P., Eckermann, S. D., Jiang, J. H., Juarez, M. D. L. T., Coy, L., and Wang, D. Y.: Remote sounding of atmospheric gravity waves with satellite limb and nadir techniques, Adv. Space Res., 37, 2269–2277, 2006.
Wu, D. L.: Small-scale fluctuations and scintillations in high-resolution GPS/CHAMP SNR and phase data, J. Atmos. Sol.–Terr. Phys., 68, 999–1017, 2006.
Wu, Z., Sarachik, E. S., and Battisti, D. S.: Vertical structure of convective heating and the three-dimensional structure of the forced circulation on an equatorial beta plane, J. Atmos. Sci., 57, 2169–2187, 2000.
Yanai, M. and Maruyama, T.: Stratospheric wave disturbances propagating over the equatorial Pacific, J. Meteorol. Soc. Jpn., 44, 291–294, 1966.
Yee, J. H., Talaat, E. R., Christensen, A. B., Killeen, T. L., Russell, J. M., and Woods, T. N.: TIMED instruments, Johns Hopkins APL Technical Digest, 24, 156–164, 2003.