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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 26, issue 5
Ann. Geophys., 26, 1233–1241, 2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: The fourth IAGA-ICMA-CAWSES Workshop "Long-Term Changes and...

Ann. Geophys., 26, 1233–1241, 2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  28 May 2008

28 May 2008

Climatic variability of the mean flow and stationary planetary waves in the NCEP/NCAR reanalysis data

A. Yu. Kanukhina, E. V. Suvorova, L. A. Nechaeva, E. K. Skrygina, and A. I. Pogoreltsev A. Yu. Kanukhina et al.
  • Russian State Hydrometeorological University, Maloohtinsky 98, St. Petersburg, 195196, Russia

Abstract. NCEP/NCAR (National Center for Environmental Prediction – National Center for Atmospheric Research) data have been used to estimate the long-term variability of the mean flow, temperature, and Stationary Planetary Waves (SPW) in the troposphere and lower stratosphere. The results obtained show noticeable climatic variabilities in the intensity and position of the tropospheric jets that are caused by temperature changes in the lower atmosphere. As a result, we can expect that this variability of the mean flow will cause the changes in the SPW propagation conditions. The simulation of the SPW with zonal wave number m=1 (SPW1), performed with a linearized model using the mean flow distributions typical for the 1960s and for the beginning of 21st century, supports this assumption and shows that during the last 40 years the amplitude of the SPW1 in the stratosphere and mesosphere increased substantially. The analysis of the SPW amplitudes extracted from the geopotential height and zonal wind NCEP/NCAR data supports the results of simulation and shows that during the last years there exists an increase in the SPW1 activity in the lower stratosphere. These changes in the amplitudes are accompanied by increased interannual variability of the SPW1, as well. Analysis of the SPW2 activity shows that changes in its amplitude have a different sign in the northern winter hemisphere and at low latitudes in the southern summer hemisphere. The value of the SPW2 variability differs latitudinally and can be explained by nonlinear interference of the primary wave propagation from below and from secondary SPW2.

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