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Tsuyuki, T., 2019: Ensemble Kalman filtering based on potential vorticity for atmospheric multi-scale data assimilation. J. Meteor. Soc. Japan, 97, 1191-1210.
https://doi.org/10.2151/jmsj.2019-067Graphical Abstract

Plain Language Summary: A multi-scale data assimilation method for the ensemble Kalman filter (EnKF) is proposed and its performance is demonstrated using a shallow water model. The method is based on the conservation and invertibility of potential vorticity. It suppresses spurious error correlations between the balanced and unbalanced parts of dynamical state variables and makes it possible to appropriately address the balance issue of covariance localization.

Highlights:

  • The proposed EnKF is superior in the accuracy of the analysis to the conventional EnKF unless the ensemble size is sufficiently large.
  • The adjustment of balanced and unbalanced mass variables is necessary for the proposed EnKF to outperform the conventional EnKF.
  • The computational cost of the proposed EnKF is about 10% more than that of the conventional EnKF.

New Releases and Graphical Abstracts

JMSJ, 2020, Vol. 98, No.2 (April)  EOR NEW

  • Naoe, H., T. Matsumoto, K. Ueno, T. Maki, M. Deushi, and A. Takeuchi, 2020: Bias correction of multi-sensor total column ozone satellite data for 1978-2017. J. Meteor. Soc. Japan, 98, https://doi.org/10.2151/jmsj.2020-019. NEW
  • Tomita, T., and T. Yamaura, 2020: Interannual variability of Baiu frontal activity in May and its connectivity with June. J. Meteor. Soc. Japan, 98, https://doi.org/10.2151/jmsj.2020-018. NEW
  • Aono, K., T. Iwasaki, and T. Sasai, 2020: Wind-evaporation feedback effects in outer regions on tropical cyclone development. J. Meteor. Soc. Japan, 98, https://doi.org/10.2151/jmsj.2020-017. NEW
  • Jayalakshmi, J., B. K. Seela, P.-L. Lin, P.-K. Wang, C.-H. Tseng, K. K. Reddy, H. Hashiguchi, L. Feng, S. K. Das, and C. K. Unnikrishnan, 2020: Raindrop size distribution characteristics of Indian and Pacific Ocean tropical cyclones observed at India and Taiwan sites. J. Meteor. Soc. Japan, 98, https://doi.org/10.2151/jmsj.2020-015. NEW
  • Chen, W., Z. Guan, H. Yang, and Q. Xu, 2020: East Asian-Australian monsoon variations and their impacts on regional climate during boreal summer. J. Meteor. Soc. Japan, 98, https://doi.org/10.2151/jmsj.2020-014.
    Early Online Release> Graphical Abstract NEW

JMSJ, 2020, Vol. 98, No.1 (February)  EOR NEW

JMSJ, 2019, Vol. 97, No.6 (December)New issue