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2019-20 Honours project - An analysis of the likelihood of meteorological conditions suitable for downburst thunderstorms over Tasmania using the BARRA reanalysis

University of Tasmania, Australia
Zha, Dongye ; Corney, Stuart ; Fox-Hughes, Paul ; Earl, Nick ; Love, Peter
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=http://metadata.imas.utas.edu.au/geonetwork/srv/eng/search?uuid=9d953ce9-7b43-40e4-aa9e-8588b5491483&rft.title=2019-20 Honours project - An analysis of the likelihood of meteorological conditions suitable for downburst thunderstorms over Tasmania using the BARRA reanalysis&rft.identifier=http://metadata.imas.utas.edu.au/geonetwork/srv/eng/search?uuid=9d953ce9-7b43-40e4-aa9e-8588b5491483&rft.description=This project will determine the downburst thunderstorms over Tasmania from the Severe Storms Archive, investigate the atmospheric condition during those downburst thunderstorms and determine the probability of meteorological conditions suitable for downburst thunderstorms over Tasmania during 1990-2019. This project will use the recently completed Bureau of Meteorology Atmospheric high-resolution Regional Reanalysis for Australia (BARRA) dataset, which offers more than 100 atmospheric model variables at higher resolution in space and time than existing global reanalyses (Jakob et al. 2017). The hourly temporal resolution, 70 levels vertical resolution and 1.5 km horizontal resolution, which has been developed specifically for Tasmania and other three regions, makes it particularly powerful in comparison to larger scale reanalyses for analysis of short-term phenomena like thunderstorms and their environments in Tasmania.Statement: Crucially, BARRA also provides a lot of information that are not available from observations. This dataset provides output at hourly time steps for a full suite of atmospheric model variables (such as temperature, precipitation, wind speed and direction, humidity, evaporation, soil moisture, information at pressure and model levels, information on solar radiation and cloud cover) at either 1.5km or 12 km horizontal resolution and 70 vertical levels (Bureau of Meteorology, 2019a; Su et al., 2019). In this study, we will analyse the ambient temperature over the air, dew point temperature and wind data to obtain a series of indices. Downdraft Convective available potential energy (DCAPE) is the maximum energy available to a descending air mass and used to access the intensity of downdrafts potential in thunderstorms. WINDEX and GUSTEX can be used to assess the potential for the damaging wind gusts and can test their intensity. So, we can use those indicators to distinguish between damaging downburst days and non-severe days.&rft.creator=Zha, Dongye &rft.creator=Corney, Stuart &rft.creator=Fox-Hughes, Paul &rft.creator=Earl, Nick &rft.creator=Love, Peter &rft.date=2020&rft.type=dataset&rft.language=English Access the data
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Brief description

This project will determine the downburst thunderstorms over Tasmania from the Severe Storms Archive, investigate the atmospheric condition during those downburst thunderstorms and determine the probability of meteorological conditions suitable for downburst thunderstorms over Tasmania during 1990-2019. This project will use the recently completed Bureau of Meteorology Atmospheric high-resolution Regional Reanalysis for Australia (BARRA) dataset, which offers more than 100 atmospheric model variables at higher resolution in space and time than existing global reanalyses (Jakob et al. 2017). The hourly temporal resolution, 70 levels vertical resolution and 1.5 km horizontal resolution, which has been developed specifically for Tasmania and other three regions, makes it particularly powerful in comparison to larger scale reanalyses for analysis of short-term phenomena like thunderstorms and their environments in Tasmania.

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Statement: Crucially, BARRA also provides a lot of information that are not available from observations. This dataset provides output at hourly time steps for a full suite of atmospheric model variables (such as temperature, precipitation, wind speed and direction, humidity, evaporation, soil moisture, information at pressure and model levels, information on solar radiation and cloud cover) at either 1.5km or 12 km horizontal resolution and 70 vertical levels (Bureau of Meteorology, 2019a; Su et al., 2019).

In this study, we will analyse the ambient temperature over the air, dew point temperature and wind data to obtain a series of indices. Downdraft Convective available potential energy (DCAPE) is the maximum energy available to a descending air mass and used to access the intensity of downdrafts potential in thunderstorms. WINDEX and GUSTEX can be used to assess the potential for the damaging wind gusts and can test their intensity. So, we can use those indicators to distinguish between damaging downburst days and non-severe days.

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Credit
IMAS Honours Student Program 2019-2020

Created: 2020-08-31

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Other Information
(DATA ACCESS - all Matlab code [.zip direct download])

uri : https://data.imas.utas.edu.au/attachments/9d953ce9-7b43-40e4-aa9e-8588b5491483/Matlab_code.zip

(DATA ACCESS - Plots & Figures [.zip direct download])

uri : https://data.imas.utas.edu.au/attachments/9d953ce9-7b43-40e4-aa9e-8588b5491483/plots_figures.zip

(THESIS - An analysis of the likelihood of meteorological conditions suitable for downburst thunderstorms over Tasmania using the BARRA reanalysis [PDF direct download])

uri : https://data.imas.utas.edu.au/attachments/9d953ce9-7b43-40e4-aa9e-8588b5491483/Thesis_Dongye.pdf

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  • global : 9d953ce9-7b43-40e4-aa9e-8588b5491483
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