Publication Abstracts

Perlwitz and Graf 2001

Perlwitz, J., and H.-F. Graf, 2001: The variability of the horizontal circulation in the troposphere and stratosphere - A comparison. Theor. Appl. Climatol., 69, 149-161, doi:10.1007/s007040170021.

The variability of the horizontal circulation in the stratosphere and troposphere of the Northern Hemisphere (NH) is compared by using various approaches. Spatial degrees of freedom (dof) on different time scales were derived. Modes of variability were computed in geopotential height fields at the tropospheric and stratospheric pressure levels by applying multivariate statistical approaches. Features of the spatial and temporal variability of the winterly zonal wind were studied with the help of recurrence and persistence analyses. The geopotential height and zonally-averaged zonal wind at the 50-, 500- and 1000-hPa level are used to investigate the behavior of the horizontal circulation in the lower stratosphere, mid-troposphere and at the near surface level, respectively. It is illustrated that the features of the variability of the horizontal circulation are very similar in the mid-troposphere and at the near surface level. Due to the filtering of tropospheric disturbances by the stratospheric and upper tropospheric zonal mean flow, the variability of the stratospheric circulation exhibits less spatial complexity than the circulation at tropospheric pressure levels. There exist enormous differences in the number of degrees of freedom (or free variability modes) between both atmospheric layers. Results of the analyses clearly show that the concept of a zonally symmetric AO with a simple structure in the troposphere similar to the one in the stratosphere is not valid. It is concluded that the spatially filtered climate change signal can be detected earlier in the stratosphere than in the mid-troposphere or at the near surface level.

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BibTeX Citation

@article{pe09000a,
  author={Perlwitz, J. and Graf, H.-F.},
  title={The variability of the horizontal circulation in the troposphere and stratosphere - A comparison},
  year={2001},
  journal={Theor. Appl. Climatol.},
  volume={69},
  pages={149--161},
  doi={10.1007/s007040170021},
}

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RIS Citation

TY  - JOUR
ID  - pe09000a
AU  - Perlwitz, J.
AU  - Graf, H.-F.
PY  - 2001
TI  - The variability of the horizontal circulation in the troposphere and stratosphere - A comparison
JA  - Theor. Appl. Climatol.
VL  - 69
SP  - 149
EP  - 161
DO  - 10.1007/s007040170021
ER  -

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