Articles | Volume 15, issue 5
https://doi.org/10.5194/gmd-15-2293-2022
https://doi.org/10.5194/gmd-15-2293-2022
Development and technical paper
 | 
17 Mar 2022
Development and technical paper |  | 17 Mar 2022

An update on the 4D-LETKF data assimilation system for the whole neutral atmosphere

Dai Koshin, Kaoru Sato, Masashi Kohma, and Shingo Watanabe

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Cited articles

Abe, S., Umemura, N., Koyama, Y., Tanaka, Y., Yagi, M., Yatagai, A., Shinbori, A., Ueno, S., Sato, Y., and Kaneda, N.: Progress of the IUGONET system – metadata database for upper atmosphere ground-based observation data, Earth Planets Space, 66, 133, https://doi.org/10.1186/1880-5981-66-133, 2014. 
Anderson, J. L.: An Ensemble Adjustment Kalman Filter for Data Assimilation, Mon. Weather Rev., 129, 2884–2903, https://doi.org/10.1175/1520-0493(2001)129<2884:AEAKFF>2.0.CO;2, 2001. 
Anderson, J. L., Hoar, T., Raeder, K., Liu, H., Collins, N., Torn, R., and Avellano, A.: The Data Assimilation Research Testbed: A Community Facility, B. Am. Meteorol. Soc., 90, 1283–1296, https://doi.org/10.1175/2009BAMS2618.1, 2009. 
Batubara, M., Suryana, R., Manik, T., and Sitompul, P.: Kototabang – West Sumatera meteor radar: System design and initial results of a large scale meteor echo, TSSA, 17–21, https://doi.org/10.1109/TSSA.2011.6095399, 2011. 
Becker, E.: Dynamical Control of the Middle Atmosphere, Space Sci. Rev., 168, 283–314, https://doi.org/10.1007/s11214-011-9841-5, 2012. 
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Short summary
The 4D ensemble Kalman filter data assimilation system for the whole neutral atmosphere has been updated. The update includes the introduction of a filter to reduce the generation of spurious waves, change in the order of horizontal diffusion of the forecast model to reproduce more realistic tidal amplitudes, and use of additional satellite observations. As a result, the analysis performance has been greatly improved, even for disturbances with periods of less than 1 d.
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