Bengtsson L., Kanamitsu M., Kallberg P. and Uppala. S., 1982: FGGE 4-
dimensional data assimilation at ECMWF. Bull. Amer. Meteor. Soc., 63,
29- 43.

Hollingsworth A., Lönnberg P., 1986: The statistical structure of
short- range forecast errors as determined from radiosonde data. Part
I: The wind field.

Hollingsworth A., Shaw D.B., Lönnberg P., Illari L., Arpe K. and
Simmons A.J., 1986: Monitoring of observation and analysis quality by
a data assimilation system. Mon.Wea.Rev., 114, 5, 861-879.

Lönnberg P., Hollingsworth A., 1986: The statistical structure of
short- range forecast errors as determined from radiosonde data. Part
II: The covariance of heights and wind errors, TELLUS 38A, 137-161.

Lorenc A.C., 1981: A global three-dimensional multivariate statistical
interpretation scheme. Mon.Wea.Rev., 109, 701-721.

Shaw D.B., Lönnberg P., Hollingsworth A. and Undén P., 1987:
Data assimilation: The 1984/85 revision of the ECMWF mass and wind
analysis. Q.J.R. Meteorol. Soc., 113, 533-566.

Undén P., 1989: Tropical data assimilation and analysis of
divergence. Mon.Wea.Rev., 117, 2495-2517.

Machenhauer B., 1977: On the dynamics of gravity oscillations in a
shallow water model, with application to normal mode
initialization. Beitr. Phys. Atmos. 50, 259-271.

Temperton C., Williamson D.L., 1981: Normal mode initialisation for a
multivariate grid-point model: Part I linear aspects. Mon.Wea.Rev.,
109, 720;743.

Temperton C., 1988: Implicit normal mode initialization. Mon.Wea.Rev.,
116, 1013-1031.

Wergen W., 1988: The diabatic ECMWF normal mode initialisation
scheme. Beitr. Phys. Atmosph. 61, 274-304.

Williamson D.L., Temperton C., 1981: Normal mode initialisation for a
multivariate grid-point model: Part II nonlinear aspects. Mon.Wea.Rev.,
109, 744-757.

Geleyn J.F., Hollingsworth A., 1979: An economical analytical method
for the computation of the interaction between scattering and line
absorption of radiation. Beitr. Phys. Atmos., 52, 1-16.

Geleyn J.F., Preuss H.J., 1983: A new data set of satellite-derived
surface albedo values for operational use at ECMWF. Arch. Meteor.
Geophys. Bioclim., Ser. A, 32, 353-359.

Geleyn J.F., 1988: Interpolation of wind temperature and humidity
values from model levels to the height of measurements. Tellus, 40A,
347-351.

Hortal M., Simons A., 1991: Use of reduced Gaussian grids in spectral
models. Mon.Wea.Rev., 119, 1057-1074.

Janssen P., Beljaars A., Simmons A., Viterbo P., 1992: On the
determination of the surface stress in an atmospheric
model. Mon.Wea.Rev., in print.

Jarraud M., Simmons A., Kanamitsu M., 1988: Sensitivity of
medium-range weather forecasts to the use of an envelope orography.
Quart. J. Roy. Meteor. Soc., 114, 989-1025.

Louis J.-F., 1979: A parametric model of vertical eddy fluxes in the
atmosphere. Boundary-layer Meteorol., 17, 187-202.

Miller M., Beljaars A., Palmer T., 1992: The sensitivity of the ECMWF
model to the parametrization of evaporation from the tropical
oceans. J. of Climate, 5, 418-434.

Miller M., Palmer T., Swinbank R., 1989: Orographic gravity-wave drag:
its parametrization and influence in general circulation and numerical
weather prediction model. Meteor. Atmos. Phys., 40, 84-109.

Morcrette J.-J., 1991: Radiation and cloud radiative properties in the
European Centre For Medium-Range Weather Forecasts forecasting system.
Journal of Geoph. Res., 96, 9121-9132.

Morcrette J.-J., 1990: Impact of changes to the radiative transfer
parametrization plus cloud optical properties in the ECMWF model.
Mon.Wea.Rev., 118, 847-873.

Simons A.J., Burridge D.M., Jarraud M., Girard C., Wergen W., 1989:
The ECMWF medium-range prediction models. Development of the numerical
formulations and the impact of increased resolution. Meteor.Atmos.Phys.,
40, 28-60.

Simmons A., Dent D., 1989: The ECMWF multi-tasking weather prediction
model. Computer Physics Reports, 11, 165-194.

Slingo J.J., 1987: The development and verification of a cloud
prediction scheme for the ECMWF model. Q.J.R. Meteorol. Soc., 213, 899-927.

Tiedtke M., 1984: The effect of penetrative cumulus convection on the
large scale flow in the general circulation model. Beitr. Phys. Atmos.,
57, 216- 239.

Tiedtke M., 1989: A comprehensive massflux scheme for cumulus
parametrization in large-scale models. Mon.Wea.Rev., 117, 1779-1800.

Weaver et al, 1993: Thermodynamic balance of three-dimensional
stratospheric winds derived from a data assimilation procedure. J.
Atmos. Sci., 50, 2987-2993.