67th DA Seminar (10 June 2020) – Dr Guo-Yuan Lien

On 10 June we held the 67th DA seminar. The speaker was Dr Guo Yuan Lien from Central Weather Bureau in Taiwan.

Dr Lien spoke about the recent work with the operational global numerical weather prediction system used by the CWB including the assimilation of Global Navigation Satellite System radio occultation observations from the COSMIC-2 satellite as well as work with the EFSO on hybrid EnVar DA system.

Dr Lien is a former member of the DA team at RIKEN as it is always great to hear about his research and how his life back in native Taiwan is going. We look forward to hearing again from him in the near future.


69th DA Seminar (11 September 2020) – Prof Shunji Kotsuki and Dr Keiichi Kondo

On September 11 2020 we held the 69th DA seminar online. The seminar was a joint presentation given by Prof. Shunji Kotsuki from Chiba University and Dr. Keiichi Kondo from JMA-MRI.

They spoke about their work using particle filters in use of high dimensional dynamical systems. Kotsuki-san talked about his development of a local particle filter with use with the LETKF data assimilation scheme and implementation of the Gaussian mixture to improve the local particle filter. His results showed that the added implementation of the Gaussian mixture outperforms the standard local particle filter for sparsely observed regions.

We would like to thank both Prof. Kotsuki and Dr Kondo for talking about their recent work and look forward to discussing more with them in future.










Data Assimilation Seminar – Dr Naoto Nakano

We held the 64th Data Assimilation Seminar at RIKEN Center for Computational Science (R-CCS) on 25 October.

The talk was given by Dr Naoto Nakano who is a senior lecturer in the Department of Mathematics at Kyoto University. Today he spoke about his work in data driven modelling based on reservoir dynamics. This included work using the 1963 and 1996 lorenz model to try to better predict the state of variables using pre-exisiting timeseries.

We would like to thank Dr Nakano very much for visiting us again in Kobe and look forward to his next visit!

For more information about this and all our DA seminars at RIKEN R-CCS, please see the DA seminar page:


研究紹介のカテゴリに オープンデータ のページを追加しました.このページではチームが作成したプログラムなどを公開しています.

これまで データ同化を学ぶ“のページで公開していた LETKF や SCALE-LETKF に加え,動的全球植生モデルである SEIB-DVGM に Particle Filter を実装し Leaf Area Index の同化を可能とした SEIB-PF を新たに公開しています.