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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2018-277
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2018-277
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model experiment description paper 06 Dec 2018

Model experiment description paper | 06 Dec 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

BARRA v1.0: The Bureau of Meteorology Atmospheric high-resolution Regional Reanalysis for Australia

Chun-Hsu Su1, Nathan Eizenberg1, Peter Steinle1, Dörte Jakob1, Paul Fox-Hughes2, Christopher J. White3,4, Susan Rennie1, Charmaine Franklin1, Imtiaz Dharssi1, and Hongyan Zhu1 Chun-Hsu Su et al.
  • 1Bureau of Meteorology, Docklands, Victoria 3008, Australia
  • 2Bureau of Meteorology, Hobart, Tasmania 7000, Australia
  • 3Department of Civil and Environmental Engineering, University of Strathclyde, Glasgow, Scotland, UK
  • 4Antarctic Climate and Ecosystems Cooperative Research Centre, Hobart, Australia

Abstract. The Bureau of Meteorology Atmospheric high-resolution Regional Reanalysis for Australia (BARRA) is the first atmospheric regional reanalysis over a large region covering Australia, New Zealand and southeast Asia. The production of the reanalysis with approximately 12km lateral resolution – BARRA-R – is well underway with completion expected in 2019. This paper describes the numerical weather forecast model, the data assimilation methods, and the forcing and observational data used to produce BARRA-R, and analyses results from the 2007–2016 reanalysis. BARRA-R provides a realistic depiction of the meteorology at and near the surface over land as diagnosed by temperature, wind speed and precipitation. It shows closer agreement with point-scale observations and gridded analysis of observations, than leading global reanalyses. In particular, BARRA-R improves upon ERA-Interim global reanalysis in several areas at point-scale to 25km resolution. BARRA-R shows reduced negative biases in (point-scale) 10m wind speed during strong wind periods, reduced biases in (5km gridded) daily temperature maximum and minimum, and higher frequency of very heavy precipitation days at 5km and 25km resolution. Few issues with BARRA-R are also identified; some of which are common in reanalyses, such as biases in 10m wind, and others that are more specific to BARRA such as grid point storms. Some of these issues could be improved through dynamical downscaling of BARRA-R fields using convective-scale (<2km) models.

Chun-Hsu Su et al.
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The Bureau of Meteorology Atmospheric high-resolution Regional Reanalysis for Australia (BARRA) is the first regional reanalysis for Australia, New Zealand and SE Asia. BARRA offers superior depictions of near surface meteorology at finer spatial scales when compared against a coarse-scale global reanalysis. It uses a consistent method of analysing the atmosphere with a higher resolution model over 1990 to 2017, and can provide greater understanding of past weather including extreme events.
The Bureau of Meteorology Atmospheric high-resolution Regional Reanalysis for Australia (BARRA)...
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