Journal Publications

1.
Polavarapu, S., T. Shepherd, Y. Rochon and S. Ren, 2005. Some Challenges of Middle Atmosphere Data Assimilation. Q. J. Royal Met. Soc., In Press.

2.
Neef, L., S. Polavarapu and T. Shepherd, 2005. Four-Dimensional data assimilation and balanced dynamics. J. Atmos. Sci., In Press.

3.
Polavarapu, S., M., S. Ren, A. Clayton, Y. Rochon, D. Sankey, 2004. On the relationship between Incremental analysis Updating and Incremental Digital Filtering. Monthly Weather Review, 132:2495-2502.

4.
Polavarapu, S., M., S. Ren, Y. Rochon, D. Sankey, N. Ek, J. Koshyk and D. Tarasick, 2004: Data assimilation with the Canadian Middle Atmosphere Model. Atmosphere-Ocean, 43:77-100.

5.
Polavarapu, S., M., Tanguay and L. Fillion, 2000. Four-Dimensional Variational Data Assimilation with Digital Filter Initialization, Monthly Weather Review, 128:2491-2510.

6.
Tanguay, M. and S. Polavarapu, 1999. The Adjoint of the Semi-Lagrangian Treatment of the Passive Tracer Equation. Monthly Weather Review, 127:551-564.

7.
Polavarapu, S. and M. Tanguay, 1998. Linearizing iterative processes for Four-Dimensional Data Assimilation. Q. J. Roy. Meteorol. Soc., 124:1715-1742.

8.
Makar, P. A. and S. M. Polavarapu, 1997. Analytic Solutions for Gas-Phase Chemical Mechanism Compression. Atmospheric Environment, 31:1025-1039.

9.
Tanguay, M., S. Polavarapu and P. Gauthier, 1997. Temporal Accumulation of First-Order Linearization Error for Semi-Lagrangian Passive Advection. Monthly Weather Review, 125:1296-1311.

10.
Polavarapu, S., M. Tanguay, R. Ménard, A. Staniforth, 1996. The Tangent Linear Model for Semi-Lagrangian Schemes. Tellus, 48A:74-95.

11.
Polavarapu, S. M., 1995. Divergent Wind Analyses in the Oceanic Boundary Layer. Tellus, 47A:221-239.

12.
Polavarapu, S. M. and W. R. Peltier, 1993. The Structure and Nonlinear Evolution of Synoptic Scale Cyclones. Part II: Wave-Mean Flow Interaction. J. Atmos. Sci., 50:3164-3184.

13.
Polavarapu, S. M. and W. R. Peltier, 1993. On the Formation of Secondary Cyclones in Numerical Simulations of Synoptic-Scale Baroclinic Waves: Secondary Instability at the Cusp. J. Atmos. Sci., 50:1047-1057.

14.
Polavarapu, S. M. and W. R. Peltier, 1990. The Structure and Nonlinear Evolution of Synoptic Scale Cyclones: Life Cycle Simulations with a Cloud Scale Model. J. Atmos. Sci., 47:2645-2672.

15.
Peltier W. R., G. W. K. Moore and S. Polavarapu, 1990. Cyclogenesis and Frontogenesis. Tellus, 42A:3-13.

Technical Reports

1.
Zhang, X.-F., S. M. Polavarapu and P. A. Makar, 1999. A Computationally Efficient Extended Kalman Filter for Chemistry-Transport Models, In KNMI (Royal Netherlands Meteorological Institute) Publication series 188, pg. 113-117.
2.
Polavarapu, S. M., 1993. An Analysis of Divergence for Marine Boundary Layer Data using Statistical Interpolation. Research Report No. (MSRB/ARMA) 93-007

Conference Presentations

  1. Polavarapu, S. and M. Tanguay, 2000. On the balance imposed by digital filter constraints in 4DVAR. (Fourth Workshop on Adjoint Applications in Meteorology, June 26-30, 2000, Moliets, France)

  2. Polavarapu, S., M. Tanguay, L. Fillion, 1999. Four-Dimensional Variational Assimilation with Digital Filter Initialization. (3rd WMO Symposium on the Assimilation of Observations in Meteorology and Oceanography, June 16-20, 1999, Quebec city, Quebec)

  3. Tanguay, M., S. Laroche, S. Polavarapu, 1999. Sensitivity Analyses with the Gridpoint GEM model. (3rd WMO Symposium on the Assimilation of Observations in Meteorology and Oceanography, June 16-20, 1999, Quebec city, Quebec)

  4. Zhang, X.-F., S. Polavarapu and P. Makar, 1998. A Computationally Efficient Extended Kalman Filter for Chemistry Modelling. (Air Pollution Modelling and Simulation, Oct. 26-30, 1998, Paris, France)

  5. Zhang, X.-F., S. Polavarapu, P. Makar and R. Menard, 1997. A Computationally Efficient Extended Kalman Filter for Chemistry Modelling. (Global Measurement Systems for Atmospheric Composition, IGAC SPARC GAW, Toronto, Ontario, May 20-22, 1997)

  6. Polavarapu, S., M. Tanguay, L. Fillion and R. Errico, 1997. Gravity wave control in 4DVAR with a strong constraint. (Third Workshop on Adjoint Applications in Meteorology. June 16-20, 1997, Lennoxville, Quebec)

  7. Tanguay, M. and S. Polavarapu, 4DVAR with a three-dimensional global, gridpoint, semi-Lagrangian model, 1997. (Third Workshop on Adjoint Applications in Meteorology. June 16-20, 1997, Lennoxville, Quebec)

  8. Polavarapu, S., M. Tanguay and A. Staniforth, 1996. Linearizing Iterative Processes for 4-d Data Assimilation Schemes. (11th Conference on Numerical Weather Prediction, Aug. 19-23, 1996, Norfolk, Virginia)

  9. Tanguay, M., S. Polavarapu and P. Gauthier, 1996. The Impact of Anisotropic Resolution on Four-Dimensional Variational Assimilation. (11th Conference on Numerical Weather Prediction, Aug. 19-23, 1996, Norfolk, Virginia)

  10. Polavarapu, S. and P. Makar, 1997. Applying Four-Dimensional Data Assimilation Techniques to Chemistry Models (First Symposium on Integrated Observing Systems, Jan. 1997, Long Beach, California)

  11. Polavarapu, S, M. Tanguay, R. Menard, A. Staniforth, 1995. The tangent linear model for semi-Lagrangian schemes. (WMO International Symposium on Assimilation of Observations in Meteorology and Oceanography. March 13-17, 1995, Tokyo, Japan)

  12. Polavarapu, S., 1993. The impact of scatterometer data on mean sea level analyses. (Second ERS-1 Symposium. Oct. 11-14, 1993, Hamburg, Germany)

  13. Polavarapu, S. M. and J. D. Steenbergen, 1991. The Influence of Ekman Balance on the Assimilation of Surface Wind Data. (Ninth Conference on Numerical Weather Prediction. Oct. 14-18, 1991, Denver, USA)

  14. Polavarapu, S. M. and W. R. Peltier, 1991. Nonlinear Synoptic Scale Baroclinic Wave Life Cycles. (First International Winter Storms Symposium. Jan. 15-18, 1991, New Orleans, USA)

  15. Peltier W. R. and S. M. Polavarapu, 1991. The Origins and Nonlinear Evolution of Subsynoptic Scale Cyclones. (First International Winter Storms Symposium. Jan. 15-18, 1991, New Orleans, USA)

  16. Polavarapu, S. M. and W. R. Peltier, 1989. Frontal Baroclinic Wave Life Cycles: The Atmospheric Analogue of Gulf Stream Rings. (Seventh Conference on Atmospheric and Oceanic Waves and Stability. April 10-14, 1989, San Francisco, USA)

  17. Peltier, W. R., G. W. K. Moore and S. Polavarapu, 1988. Cyclogenesis and Frontogenesis, (Palmen Memorial Symposium on Extratropical Cyclones, Aug. 29 - Sept. 2, 1988, Helsinki, Finland)

  18. Ellenton, G., P. K. Misra, B. E. Ley, S. M. Polavarapu, 1982. Monthly Sulphate and Sulphur Dioxide Simulations By A Trajectory Puff Model With Spatially and Temporally Varying Loss Parameters (Third Joint Conference on Air Pollution Meteorology, Texas, USA)