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21 Feb 2005
Status : this preprint was under review for the journal ACP. A revision for further review has not been submitted.
Stratospheric temperatures and tracer transport in a nudged 4-year middle atmosphere GCM simulation
M. K. van Aalst , J. Lelieveld , B. Steil , C. Brühl , P. Jöckel , M. A. Giorgetta , and G.-J. Roelofs
We have performed a 4-year simulation with the Middle Atmosphere General Circulation Model MAECHAM5/MESSy, while slightly nudging the model’s meteorology in the free troposphere (below 113 hPa) towards ECMWF analyses. We show that the nudging 5 technique, which leaves the middle atmosphere almost entirely free, enables comparisons with synoptic observations. The model successfully reproduces many specific features of the interannual variability, including details of the Antarctic vortex structure. In the Arctic, the model captures general features of the interannual variability, but falls short in reproducing the timing of sudden stratospheric warmings. A 10 detailed comparison of the nudged model simulations with ECMWF data shows that the model simulates realistic stratospheric temperature distributions and variabilities, including the temperature minima in the Antarctic vortex. Some small (a few K) model biases were also identified, including a summer cold bias at both poles, and a general cold bias in the lower stratosphere, most pronounced in midlatitudes. A comparison 15 of tracer distributions with HALOE observations shows that the model successfully reproduces specific aspects of the instantaneous circulation. The main tracer transport deficiencies occur in the polar lowermost stratosphere. These are related to the tropopause altitude as well as the tracer advection scheme and model resolution. The additional nudging of equatorial zonal winds, forcing the quasi-biennial oscillation, sig20 nificantly improves stratospheric temperatures and tracer distributions.
Received: 06 Jan 2005 – Discussion started: 21 Feb 2005
M. K. van Aalst , J. Lelieveld , B. Steil , C. Brühl , P. Jöckel , M. A. Giorgetta , and G.-J. Roelofs
Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
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Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
- Printer-friendly version
- Supplement
M. K. van Aalst , J. Lelieveld , B. Steil , C. Brühl , P. Jöckel , M. A. Giorgetta , and G.-J. Roelofs
M. K. van Aalst , J. Lelieveld , B. Steil , C. Brühl , P. Jöckel , M. A. Giorgetta , and G.-J. Roelofs
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