Preprints
https://doi.org/10.5194/wcd-2022-50
https://doi.org/10.5194/wcd-2022-50
 
02 Sep 2022
02 Sep 2022

Anomalous subtropical zonal winds drive decreases in southern Australian frontal rain

Acacia Sarah Pepler and Irina Rudeva Acacia Sarah Pepler and Irina Rudeva
  • Australian Bureau of Meteorology, Melbourne, Australia

Abstract. Cold fronts make a significant contribution to cool season rainfall in the extratropics and subtropics. In many regions of the Southern Hemisphere the amount of frontal rainfall has declined in recent decades, but there has been no change in frontal frequency. We show that for southeast Australia this contradiction cannot be explained by changes in frontal intensity or moisture at the latitudes of interest. Rather, declining frontal rainfall in southeast Australia is associated with weakening of the subtropical westerlies in the mid troposphere, which is part of a hemispheric pattern of wind anomalies that modifies the extratropical zonal wave 3. Fronts that generate rainfall are associated with strong westerlies that penetrate well into the subtropics, and the observed decrease in frontal rainfall in southern Australia can be linked to a decrease in the frequency of fronts with strong westerlies at 25° S.

Journal article(s) based on this preprint

Acacia Sarah Pepler and Irina Rudeva

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wcd-2022-50', Anonymous Referee #1, 29 Sep 2022
    • AC1: 'Comment on wcd-2022-50', Acacia Pepler, 22 Nov 2022
  • RC2: 'Comment on wcd-2022-50', Anonymous Referee #2, 19 Oct 2022
    • AC1: 'Comment on wcd-2022-50', Acacia Pepler, 22 Nov 2022
  • AC1: 'Comment on wcd-2022-50', Acacia Pepler, 22 Nov 2022

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision
AR by Acacia Pepler on behalf of the Authors (19 Dec 2022)  Author's response    Author's tracked changes    Manuscript
ED: Referee Nomination & Report Request started (20 Dec 2022) by Shira Raveh-Rubin
RR by Anonymous Referee #1 (02 Jan 2023)
ED: Publish subject to technical corrections (03 Jan 2023) by Shira Raveh-Rubin

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wcd-2022-50', Anonymous Referee #1, 29 Sep 2022
    • AC1: 'Comment on wcd-2022-50', Acacia Pepler, 22 Nov 2022
  • RC2: 'Comment on wcd-2022-50', Anonymous Referee #2, 19 Oct 2022
    • AC1: 'Comment on wcd-2022-50', Acacia Pepler, 22 Nov 2022
  • AC1: 'Comment on wcd-2022-50', Acacia Pepler, 22 Nov 2022

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision
AR by Acacia Pepler on behalf of the Authors (19 Dec 2022)  Author's response    Author's tracked changes    Manuscript
ED: Referee Nomination & Report Request started (20 Dec 2022) by Shira Raveh-Rubin
RR by Anonymous Referee #1 (02 Jan 2023)
ED: Publish subject to technical corrections (03 Jan 2023) by Shira Raveh-Rubin

Journal article(s) based on this preprint

Acacia Sarah Pepler and Irina Rudeva

Acacia Sarah Pepler and Irina Rudeva

Viewed

Total article views: 299 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
218 71 10 299 0 1
  • HTML: 218
  • PDF: 71
  • XML: 10
  • Total: 299
  • BibTeX: 0
  • EndNote: 1
Views and downloads (calculated since 02 Sep 2022)
Cumulative views and downloads (calculated since 02 Sep 2022)

Viewed (geographical distribution)

Total article views: 308 (including HTML, PDF, and XML) Thereof 308 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 31 Jan 2023
Download

The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
In recent decades, cold fronts have rained less often in southeast Australia, which contributes to decreasing cool season rainfall. The largest changes in front dynamics are found to the north of the area where rain changes. Wet fronts have strong westerly winds that reach much further north than dry fronts do, and these fronts are becoming less common, linked to weakening subtropical winds and changes in the southern hemisphere circulation.