We were supported in this project by NASA Grants NNG04GK29G, NNX08AD40G, and NNX08AD37G, and would like to express our gratitude to the AIRS Science Team, especially Joel Susskind, Chris Barnet, Mous Chahine, and George Aumann for their guidance and helpful discussions. Chris Barnet generously provided us AIRS temperature and moisture retrievals. Gyorgy Gyarmati patiently helped us in building the observation structure. Comments by the two anonymous reviewers were very helpful in improving the manuscript.
Bishop, C. H., , B. Etherton, , and S. J. Majumdar, 2001: Adaptive sampling with the ensemble transform Kalman filter. Part I: Theoretical aspects. Mon. Wea. Rev., 129 , 420–436.
Evensen, G., 1994: Sequential data assimilation with a nonlinear quasi-geostrophic model using Monte Carlo methods to forecast error statistics. J. Geophys. Res., 99 , (C5). 10143–10162.
Holm, E., , E. Anderson, , A. Beljaars, , P. Lopez, , J-F. Mahfouf, , A. J. Simmons, , and J-N. Thepaut, 2002: Assimilation and modeling of the hydrological cycle: ECMWF’s status and plans. ECMWF Tech. Memo. 383, 55 pp.
Houtekamer, P. L., , and H. L. Mitchell, 2001: A sequential ensemble Kalman filter for atmospheric data assimilation. Mon. Wea. Rev., 129 , 123–137.
Hunt, B. R., , E. J. Kostelich, , and I. Szunyogh, 2007: Efficient data assimilation for spatiotemporal chaos: A local ensemble transform Kalman filter. Physica D, 230 , 112–126.
Liu, J., 2007: Applications of the LETKF to adaptive observations, analysis sensitivity, observation impact and assimilation of moisture. Ph.D. thesis, University of Maryland, College Park, 154 pp.
Miyoshi, T., , and S. Yamane, 2007: Local ensemble transform Kalman filter with an AGCM at a T159/L48 resolution. Mon. Wea. Rev., 135 , 3841–3861.
Parrish, D. F., , and J. C. Derber, 1992: The National Meteorological Center’s spectral statistical-interpolation analysis system. Mon. Wea. Rev., 120 , 1747–1763.
Susskind, J., , C. Barnet, , and J. Blaisdell, 2003: Retrieval of atmospheric and surface parameters from AIRS/AMSU/HSB data in the presence of clouds. IEEE Trans. Geosci. Remote Sens., 41 , 390–409.
Szunyogh, I., , E. J. Kostelich, , G. Gyarmati, , E. Kalnay, , B. R. Hunt, , E. Ott, , E. Satterfield, , and J. A. Yorke, 2008: A local ensemble transform Kalman filter data assimilation for the NCEP global model. Tellus, 60A , 113–130.
Whitaker, J. S., , and T. M. Hamill, 2002: Ensemble data assimilation without perturbed observations. Mon. Wea. Rev., 130 , 1913–1924.
Whitaker, J. S., , T. M. Hamill, , X. Wei, , Y. Song, , and Z. Toth, 2008: Ensemble data assimilation with the NCEP Global Forecast System. Mon. Wea. Rev., 136 , 463–482.