Alduchov, O. A. and Eskridge, R.E., 1996: Improved Magnus form approximation of saturation vapor pressure. J. Appl. Met., 35, 601-609.

Andersson, E., Pailleux, J., Thépaut, J.-N., Eyre, J. R., McNally, A. P., Kelly, G. A. and Courtier, P., 1994: Use of cloud-cleared radiances in three/four-dimensional variational data assimilation. Q. J. R. Meteorol. Soc., 120, 627-653

Andersson, E., Haseler, J., Undén, P., Courtier, P., Kelly, G., Vasiljevic, D., Brankovic, C., Cardinali, C., Gaffard, C., Hollingsworth, A., Jakob, C., Janssen, P., Klinker, E., Lanzinger, A., Miller, M., Rabier, F., Simmons, A., Strauss, B., Thépaut, J.-N. and Viterbo, P., 1998: The ECMWF implementation of three dimensional variational assimilation (3D-Var). Part III: Experimental results. To appear in Q. J. R. Meteorol. Soc.

Andersson, E., 1997: Implementation of variational quality control. Proc. ECMWF workshop on "Non-linear aspects of data assimilation", Reading, 9-11 September 1996.

Andersson, E. and Järvinen, H., 1999: Variational quality control. Q. J. R. Meteorol. Soc., 125, 697-722

Bartello, P. and Mitchell, H. L., 1992: A continuous three-dimensional model of short-range forecast error covariance. Tellus, 44A, 217-235.

Blondin, C., 1991: `Parametrization of land surface processes in numerical weather prediction'. Pp. 31-54 in Land surface evaporation: measurement and parametrization, T. J. Schmugge and J.-C. André, Eds., Springer-Verlag

Bouttier, F., Derber, J. and Fisher, M., 1997: The 1997 revision of the Jb term in 3D/4D-Var. ECMWF Tech. Memo. 238.

Buck, A.L., 1981: New equations for computing vapor pressure and enhancement factor. J. Appl. Met., 20, 1527-1532.

Buizza, R., 1994: Sensitivity of optimal unstable structures. Q. J. R. Meteorol. Soc., 120, 429-451

Cardinali, C., Andersson, E., Viterbo, P., Thépaut, J.-N. and Vasiljevic, D., 1994: Use of conventional surface observations in three-dimensional variational data assimilation. ECMWF Tech. Memo. 205.

Courtier, P., Thépaut, J.-N. and Hollingsworth, A., 1994: A strategy for operational implementation of 4D-Var, using an incremental approach. Q. J. R. Meteorol. Soc., 120, 1367-1388

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.

Douville, H., Viterbo, P., Mahfouf, J.-F. and Beljaars, A. C. M. (2001): "Evaluation of the optimum interpolation and nudging techniques for soil moisture analysis using FIFE data" Mon. Wea. Rev., 128, 1733-1756

Eyre, J. R., 1989: Inversion of cloudy satellite sounding radiances by nonlinear optimal estimation. Q. J. R. Meteorol. Soc., 115, 1001-1037.

Eyre, J. R., 1991: A fast radiative transfer model for satellite sounding systems. ECMWF Tech. Memo. 176.

Eyre, J.R. 1992: A bias correction scheme for simulated TOVS brightness temperatures. ECMWF Research Dept. Tech. Memo. 186.

Eyre, J. R., Kelly, G. A., McNally, A. P., Andersson, E. and Persson, A.,1993: Assimilation of TOVS radiance information through one-dimensional variational analysis. Q. J. R. Meteorol. Soc., 119, 1427-1463.

Fisher, M. and Courtier, P., 1995: Estimating the covariance matrices of analysis and forecast error in variational data assimilation, ECMWF Tech. Memo. 220.

Freilich, M. S. and Anderson, D., 1997: Ambiguity removal and assimilation of scatterometer data. Q. J. R. Meteorol. Soc., 123, 491-518

Foster , D.J. and R.D. Davy, 1988 : Global snow depth climatology. U.S. Air Force Environmental Tech. Applications Center/TN-88/006, 48 pp. [Available from National Climate Data Center, 151 Patton Avenue, Asheville, NC 28801]

Gaffard, C., Roquet, H., Hansen, B., Andersson, E. and Anderson, D., 1997: Impact of the ERS-1 scatterometer wind data on the ECMWF 3D-Var assimilation system. To appear in Q. J. R. Meteorol. Soc.

Gauthier, P. and Thepaut, J.-N., 2000: Impact of the digital filter as a weak constraint in the pre-operational 4D-Var assimilation system of Meteo-France. Submitted to Mon. Weather Rev.

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

Gerard, E, and R. Saunders, 1999: 4D-Var assimilation of SSM/I total column water vapour in the ECMWF model. ECMWF RD Tech Memo no.270.

Gilbert, J. C. and Lemaréchal, C., 1989: Some numerical experiments with variable storage quasi-Newton algorithms. Math. Prog., B25, 407-435

Harris, B. 1997: A revised bias correction scheme for TOVS radiances. ECMWF Technical Memorandum No. ?.

Hollingsworth, A. and Lönnberg, P., 1986: The statistical structure of short-range forecast errors as determined from radiosonde data. Part I: The wind field. Tellus, 38A, 111-136

Ingleby, N. B. and Lorenc, A. C., 1993: Bayesian quality control using multivariate normal distributions. Q. J. R. Meteorol. Soc.,119, 1195-1225.

Järvinen, H. and Undén, P., 1997: Observation screening and first guess quality control in the ECMWF 3D-Var data assimilation system. ECMWF Tech. Memo. 236.

Järvinen, H, S Saarinen and P Undén, 1996: User's guide for blacklisting. 51pp. Available on request from ECMWF, Shinfield Park, RG2 9AX, Reading, Berkshire, England.

Järvinen, H., E. Andersson and F. Bouttier, 1999: Variational assimilation of time sequences of surface observations with serially correlated errors. submitted to Tellus, 28pp. also, RD Tech Memo no.266.

Kelly, G. and Pailleux, J., 1988: Use of satellite vertical sounder data in the ECMWF analysis system. ECMWF Tech. Memo. 143.

Kelly, G., Andersson, E., Hollingsworth, A., Lönnberg, P., Pailleux, J. and Zhang, Z., 1991: Quality control of operational physical retrievals of satellite sounding data. Mon. Weather Rev., 119, 1866-1880.

Leidner, S. M., Hofman, R. N. and Augenbaum, J., 1999: SeaWinds Satterometer Real-Time BUFR Geophysical Data Product User's Guide Version 1.0, available from ECMWF and AER

Lönnberg, P, 1989: Developments in the ECMWF analysis system. ECMWF Seminar on Data assimilation and the use of satellite data. 5-9 September 1988, 75-119.

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

Lönnberg, P and D Shaw, 1985: Data selection and quality control in the ECMWF analysis system. ECMWF Workshop on The Use And Quality Control of Meteorological Observations, 6-9 November 1984, 225-254.

Lönnberg, P and D Shaw (Eds.), 1987: ECMWF Data Assimilation Scientific Documentation. Research Manual 1.

Lorenc, A. C., 1986: Analysis methods for numerical weather prediction. Q. J. R. Meteorol. Soc., 112, 1177-1194.

Lorenc, A. C., 1988: Optimal nonlinear objective analysis. Q. J. R. Meteorol. Soc., 114, 205-240.

Lott ,F. and Miller M.J., 1997 : A new subgrid-scale orographic drag parametrization : its formulation and testing. Q.J.R. Meteorol. Soc., 123, 101-127.

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

Louis, J.-F., Tiedtke, M. and Geleyn, J.-F., 1982: `A short history of the PBL parametrization at ECMWF'. Pp. 59-80 in Proc. ECMWF Workshop on Planetary boundary layer parameterization, Reading, 25-27 November, 1981

Lynch, P., 1993: Digital Filters for Numerical Weather Prediction. HIRLAM Technical Report No 10.

Lynch, P., 1996: The Dolph-Chebyshev Window: A Simple Optimal Filter. Mon. Weather Rev., 125, 655-660

Machenhauer, B., 1977: On the dynamics of gravity oscillations in a shallow water model, with application to normal mode initialization. Contrib. Atmos. Phys., 50, 253-271.

McNally, A. P. and Vesperini, M., 1996: Variational analysis of humidity information from TOVS radiances. Q. J. R. Meteorol. Soc., 122, 1521-1544.

Mahfouf, J.-F., Buizza, R., and Errico, R. M., 1997: Strategy for including physical processes in the ECMWF data assimilation system. In Proceedings of the ECMWF Workshop on non-linear aspects of data assimilation, Shinfield Park, Reading, RG2 9AX, 9-11 September 1996

Mahfouf, J.-F., 1998: Influence of physical processes on the tangent-linear approximation

Mahfouf, J.-F. (1991): "Analysis of soil moisture from near surface parameters : a feasibility study", J. Appl. Meteor., 30, 1534-1547

Pailleux, J.,1990: `A global variational assimilation scheme and its application for using TOVS radiances'. Pp. 325-328 in Proc. WMO International Symposium on Assimilation of observations in meteorology and oceanography", Clermont-Ferrand, France

Parrish, D. F. and Derber, J. C., 1992: The National Meteorological Center's spectral statistical interpolation analysis system. Mon. Weather Rev., 120, 1747-1763.

Phalippou, L., 1996: Variational retrieval of humidity profile, wind speed and cloud liquid-water path with the SSM/I: Potential for numerical weather prediction. Q. J. R. Meteorol. Soc., 122, 327-355.

Phalippou, L. and Gérard, É., 1996: `Use of precise microwave imagery in numerical weather forecasting'. Study report to the European Space Agency. Available from ECMWF.

Rabier, F. and McNally, A., 1993: Evaluation of forecast error covariance matrix. ECMWF Tech. Memo. 195.

Rabier, F., McNally, A., Andersson, E., Courtier, P., Undén, P., Eyre, J., Hollingsworth, A. and Bouttier, F., 1998: The ECMWF implementation of three dimensional variational assimilation (3D-Var). II: Structure funtions. To appear in Q. J. R. Meteorol. Soc.

Rabier, F., Mahfouf, J.-F., Fisher, M., Järvinen, H. , Simmons. A., Andersson, E., Bouttier, F., Courtier, P., Hamrud, M., Haseler, J., Hollingsworth, A., Isaksen, L., Klinker, E., Saarinen, S., Temperton, C., Thépaut, J.-N. , Undén, P., and Vasiljevic, D., 1997a: Recent experimentation on 4D-Var and first results from a simplified Kalman filter. ECMWF Tech. Memo. 240.

Rabier, F., Thépaut, J.-N. and Courtier, P., 1997b: Four-dimensional variational assimilation at ECMWF. In Proceedings of the ECMWF Seminar on data assimilation, Shinfield Park, Reading, RG2 9AX, September 1996.

Saunders, R. W. and Matricardi, M., 1998: `A fast forward model for ATOVS (RTATOV)'. Tech. Proc. 9th International TOVS Study Conf., Igls, Austria, 20-26 February, 1997. 11 pp.

Savijärvi, H., 1995: Error growth in a large numerical forecast system. Mon. Wea. Rev., 123, 212-221.

Simmons, A. J. and Burridge, D., 1981: An energy and angular momentum conserving vertical finite difference scheme and hybrid coordinate. Mon. Weather Rev., 109, 758-766.

Simmons, A. J. and Chen, J., 1991: The calculation of geopotential and the pressure gradient in the ECMWF atmospheric model: Influence on the simulation of the polar atmosphere and on temperature analyses. Q. J. R. Meteorol. Soc., 117, 29-58.

Stoffelen, A. 1999: Scatterometry. PhD Thesis, available from KNMI

Stoffelen, A. and Anderson, D., 1997: Ambiguity removal and assimilation of scatterometer data. Q. J. R. Meteorol. Soc., 123, 491-518.

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

Temperton, C., 1989: Implicit normal mode initialization for spectral models. Mon. Weather Rev., 117, 436-451.

Thépaut, J.-N., Courtier, P., Belaud, G., and Lemaitre, G., 1996: Dynamical structure functions in a four-dimensional variational assimilation: a case study. Q. J. R. Meteorol. Soc., 122, 535-561.

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

Tomassini, M., LeMeur, D. and Saunders, R., 1997: Satellite wind observations of hurricanes and their impact on NWP model analyses and forecasts. To appear in Mon. Weather Rev.

Vasiljevic, D., Cardinali, C. and Undén, P., 1992: `ECMWF 3D-Variational assimilation of conventional observations'. In Proc. ECMWF workshop on Variational assimilation with emphasis on three-dimensional aspects. Reading, 9-12 November 1992.

Wergen, W., 1987: Diabatic nonlinear normal mode initialisation for a spectral model with a hybrid vertical coordinate. ECMWF Tech. Report 59.

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