University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Observing System Simulation Experiments of cross-layer Lagrangian data assimilation

Santitissadeekorn, N, Spiller, ET, Jones, C, Rutarindwa, R, Liu, L and Ide, K (2014) Observing System Simulation Experiments of cross-layer Lagrangian data assimilation Dynamics of Atmospheres and Oceans, 66. pp. 77-93.

Full text not available from this repository.

Abstract

We conduct Observing System Simulation Experiments (OSSEs) with Lagrangian data assimilation (LaDA) in two-layer point-vortex systems, where the trajectories of passive tracers (drifters or floats) are observed on one layer that is coupled to another layer with different dynamics. Depending on the initial position of the observed tracers, the model studied here can exhibit nonlinear features that cause the standard Kalman filter and its variants to fail. For this reason, we adopt a Monte Carlo approach known as particle filtering, which takes the nonlinear dynamics into account. The main objective of this paper is to understand the effects of drifter placement and layer coupling on the precision skill of assimilating Lagrangian data into multi-layered models. Therefore, we analyze the quality of the assimilated vortex estimates by assimilating path data from passive tracers launched at different locations, on different layers and in systems with various coupling strengths between layers. We consider two cases: vortices placed on different layers (heton) and on the same layer (non-heton). In both cases we find that launch location, launch layer and coupling strength all play a significant role in assimilation precision skill. However, the specifics of the interplay of these three factors are quite different for the heton case versus the non-heton case. © 2014.

Item Type: Article
Authors :
NameEmailORCID
Santitissadeekorn, Nn.santitissadeekorn@surrey.ac.ukUNSPECIFIED
Spiller, ETUNSPECIFIEDUNSPECIFIED
Jones, CUNSPECIFIEDUNSPECIFIED
Rutarindwa, RUNSPECIFIEDUNSPECIFIED
Liu, LUNSPECIFIEDUNSPECIFIED
Ide, KUNSPECIFIEDUNSPECIFIED
Date : 1 January 2014
Identification Number : https://doi.org/10.1016/j.dynatmoce.2014.02.002
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:20
Last Modified : 17 May 2017 15:10
URI: http://epubs.surrey.ac.uk/id/eprint/838844

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800