A Hybrid Particle–Ensemble Kalman Filter for Lagrangian Data Assimilation Journal Article uri icon

Overview

abstract

  • Abstract; Lagrangian measurements from passive ocean instruments provide a useful source of data for estimating and forecasting the ocean’s state (velocity field, salinity field, etc.). However, trajectories from these instruments are often highly nonlinear, leading to difficulties with widely used data assimilation algorithms such as the ensemble Kalman filter (EnKF). Additionally, the velocity field is often modeled as a high-dimensional variable, which precludes the use of more accurate methods such as the particle filter (PF). Here, a hybrid particle–ensemble Kalman filter is developed that applies the EnKF update to the potentially high-dimensional velocity variables, and the PF update to the relatively low-dimensional, highly nonlinear drifter position variable. This algorithm is tested with twin experiments on the linear shallow water equations. In experiments with infrequent observations, the hybrid filter consistently outperformed the EnKF, both by better capturing the Bayesian posterior and by better tracking the truth.

publication date

  • January 1, 2015

Date in CU Experts

  • June 15, 2021 7:23 AM

Full Author List

  • Slivinski L; Spiller E; Apte A; Sandstede B

author count

  • 4

Other Profiles

International Standard Serial Number (ISSN)

  • 0027-0644

Electronic International Standard Serial Number (EISSN)

  • 1520-0493

Additional Document Info

start page

  • 195

end page

  • 211

volume

  • 143

issue

  • 1