- Andersson, E., Pailleux, J., The´paut, J.-N., Eyre, J., McNally, A., Kelly, G. and Courtier, P. 1994. Use of cloud-cleared radiances in three/four dimensional variational data assimilation. Q. J. R. Meteorol. Soc. 120, 627-653.
- Baker, W., Emmitt, G. D., Robertson, F., Atlas, R., Molinari, J., Bowdle, D., Paegle, J., Hardesty, R., Menzies, R., Krishnamurti, T., Brown, R., Post, M., Anderson, J., Lorenc, A. and McElroy, J. 1995. Lidarmeasured winds from space: a key component for weather and climate prediction. Bull. Am. Meteorol. Soc. 76, 869-888.
- Barwell, B. R. and Bromley, R. A. 1988. The adjustment of numerical weather prediction models to local perturbations. Q. J. R. Meteorol. Soc. 114, 665-689.
- Browning, G. L., Kreiss, H.-O. and Schubert, W. H. 2000. The role of gravity waves in slowly varying in time tropospheric motions near the equator. J. Atmos. Sci. 57, 4008- 4019.
- Bube, K. and Ghil, M. 1981. Assimilation of asynoptic data and initialization problem. In: Dynamic Meteorology: Data assimilation methods (eds. L. Bengtsson, M., Ghil and E., Ka¨lle´n), Springer-Verlag, Berlin, 111- 138.
- Cahn, A. 1945. An investigation of the free oscillations of a simple current system. J. Meteorol. 2, 113-119.
- Clayson, C. A., Strahl, B. and Schrage, J. 2002. 2-3 day convective variability in the tropical estern acific. Mon. Wea. Rev. 130, 529- 548
- Courtier, P., Andersson, E., Heckley, W., Pailleux, J., Vasiljevic´, D., Hamrud, M., Hollingsworth, A., Rabier, F. and Fisher, M. 1998. The ECMWF implementation of three-dimensional variational assimilation (3D-Var). I: Formulation. Q. J. R. Meteorol. Soc. 124, 1783- 1807.
- Daley, R. 1991. Atmospheric data analysis. Cambridge University Press, Cambridge, UK, 460 pp.
- Daley, R. 1993. Atmospheric data analysis on the equatorial beta plane. Atmos.-Ocean 31, 421-450.
- Daley, R. 1996. Generation of global multivariate error covariances by singular-value decomposition of the linear balance equation. Mon. Wea. Rev. 124, 2574-2587.
- Davies, H. C. 1976. A lateral boundary formulation for multilevel prediction models. Q. J. R. Meteorol. Soc. 102, 405-418.
- Ghil, M. 1980. The compatible balancing approach to initialization and four dimensional data assimilation. Tellus 32, 198-206.
- Gilbert, J. C. and Lemare´chal, C. 1989. Some numerical experiments with variable storage quasi-Newton algorithms. Math. Prog. B25, 407-435.
- Gill, A. E. 1982. Atmosphere-ocean dynamics. Academic Press, New York, 662 pp.
- Gordon, C. T., Umscheid, L. and Miyakoda, K. 1972. Simulation experiments for determining wind data requirements in the tropics. J. Atmos. Sci. 29, 1064-1075.
- Gustafsson, N. 1992. Use of a digital filter as weak constraint in variational data assimilation. Proc. ECMWF Workshop on Variational assimilation with special emphasis three-dimensional aspects, Reading, U.K., 9-12 November 1992, 327-338.
- Gustafsson, N. 1998. The numerical scheme and lateral boundary conditions for the spectral Hirlam and its adjoint. Proc. ECMWF Seminar on Recent developments in numerical methods for atmospheric modelling, Reading, UK., 7-11 September 1998, 335-363.
- Gustafsson, N., Berre, L., Ho¨rnquist, S., Huan, X.-Y., Lindskog, M., Navascue´s, B., Mogensen, K. S. and Thorsteinsson, S. 2001. Threedimensional variational data assimilation for a limited area model. Part I: General formulation and the background error constraint. Tellus 53A, 425- 446.
- Haltiner, G. J. and Williams, R. T. 1980. Numerical prediction and dynamic meteorology. John Wiley and Sons, New York, 477 pp.
- Hao, Z. and Ghil, M. 1994. Data assimilation in a simple tropical ocean model with wind stress errors. J. Phys. Ocean. 24, 2111-2128.
- Haugen, J. E. and Machenhauer, B. 1993. A spectral limited-area model formulation with time-dependent lateral boundary conditions applied to the shallow-water equations. Mon. Wea. Rev. 121, 2618- 2630.
- Hendon, H. H. 1986. Streamfunction and velocity potential representation of equatorially trapped waves. J. Atmos. Sci. 43, 3038-3042.
- Holton, J. R. 1992. An introduction to dynamic meteorology, 3rd edn. Academic Press, New York, 511 pp.
- Ingleby, N. B. 2001. The statistical structure of forecast errors and its representation in the Met Office Global 3-D Variational Data Assimilation Scheme. Q. J. R. Meteorol. Soc. 127, 209-231.
- Kistler, R., Kalnay, E., Collins, W., Saha, S., White, G., Woollen, J., Chelliah, M., Ebisuzaki, W., Kanamitsu, M., Kousky, V., van den Dool, H., Jenne, R. and Fiorino, M. 2001. The NCEP-NCAR 50-year reanalysis: monthly means CD-ROM and documentation. Bull. Am. Meteorol. Soc. 82, 247-267.
- Le Dimet, F.-X. and Talagrand, O. 1986. Variational algorithms for analysis and assimilation of meteorological observations: theoretical aspects. Tellus 38A, 97- 110.
- Matsuno, T. 1966. Quasi-geostrophic motions in the equatorial area. J. Meteorol. Soc. Jpn. 44, 25-42.
- Parrish, D. 1988. The introduction of Hough functions into optimum interpolation. Proc. Eighth Conf. on NWP, Am. Meteorol. Soc., Boston, Mass., 191-196.
- Ricciardulli, L. and Garcia, R. R. 2000. The excitation of equatorial waves by deep convection in the NCAR community climate model (CCM3). J. Atmos. Sci. 57, 3461-3487.
- Rossby, C. G. 1937. On the mutual adjustment of pressure and velocity distribution in certain simple current systems. J. Marine Res. 1, 15- 27.
- Rossby, C. G. 1938. On the mutual adjustment of pressure and velocity distribution in certain simple current systems, II. J. Marine Res. 1, 239-263.
- Scaife, A. A., Butchart, N., Warner, C. and Swinbank, R. 2002. Impact of a spectral gravity wave parameterization on the stratosphere in the Met Office Unified Model. J. Atmos. Sci. 59, 1473- 1489.
- Talagrand, O. 1981. A study of the dynamics of four-dimensional data assimilation. Tellus 33, 43-60.
- Talagrand, O. and Courtier, P. 1987. Variational assimilation of meteorological observations with the adjoint vorticity equation. I: Theory. Q. J. R. Meteorol. Soc. 113, 1311-1328.
- Wheeler, M. and Kiladis, G. N. 1999. Convectively coupled equatorial waves: analysis of clouds and temperature in the wavenumberfrequency domain. J. Atmos. Sci. 56, 374-399.
- Wheeler, M., Kiladis, G. N. and Webster, P. J. 2000. Large-scale dynamical fields associated with convectively coupled equatorial waves. J. Atmos. Sci. 57, 613-640.