Preprints
https://doi.org/10.5194/essd-2021-194
https://doi.org/10.5194/essd-2021-194

  14 Jun 2021

14 Jun 2021

Review status: this preprint is currently under review for the journal ESSD.

Next generation of Bluelink ocean reanalysis with multiscale data assimilation: BRAN2020

Matthew A. Chamberlain1, Peter R. Oke1, Russell A. S. Fiedler1, Helen M. Beggs2, Gary B. Brassington2, and Prasanth Divakaran2 Matthew A. Chamberlain et al.
  • 1CSIRO Oceans and Atmosphere, Hobart, TAS, Australia
  • 2Bureau of Meteorology, Australia

Abstract. BRAN2020 is an ocean reanalysis that combines ocean observations with an eddy-resolving, near-global ocean general circulation model, to produce four-dimensional estimates of the ocean state. The data assimilation system employed is ensemble optimal interpolation, implemented with a new multiscale approach that constrains the broad-scale ocean properties and the mesoscale circulation in two steps. The reanalysis spans January 1993 to December 2019, and assimilates observations of in situ temperature and salinity, as well as satellite sea-level anomaly and sea surface temperature. Reanalysed fields from BRAN2020 generally show much closer agreement to observations than all previous versions with mis-fits between reanalysed and observed fields reduced by over 30 % for some variables. The BRAN2020 dataset is comprised of daily-averaged fields of temperature, salinity, velocity, mixed-layer depth, and sea-level. Reanalysed fields realistically represent all of the major current systems within 75° S and 75° N, excluding processes relating to sea ice, but including boundary currents, equatorial circulation, Southern Ocean variability, and mesoscale eddies. BRAN2020 is publicly-available at https://doi.org/10.25914/6009627c7af03 (Chamberlain et al., 2021b) and is intended for use by the research community.

Matthew A. Chamberlain et al.

Status: open (until 14 Aug 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2021-194', Anonymous Referee #1, 30 Jun 2021 reply
  • RC2: 'Comment on essd-2021-194', Anonymous Referee #2, 20 Jul 2021 reply

Matthew A. Chamberlain et al.

Data sets

Bluelink Ocean Reanalysis - BRAN2020 Chamberlain, Matthew A. , Oke, Peter R. , Fiedler, Russell https://doi.org/10.25914/6009627c7af03

Matthew A. Chamberlain et al.

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Short summary
BRAN2020 is a dynamical reconstruction of the ocean combining observations with a high-resolution global ocean model. BRAN2020 spans January 1993 to December 2019, assimilating in situ temperature and salinity, as well as satellite-based sea-level and sea surface temperature. A new multiscale approach to data assimilation constrains the broad-scale ocean properties and turbulent mesoscale dynamics in two steps, showing closer agreement to observations than all previous versions.