Extending and understanding the South West Western Australian rainfall record using a snowfall reconstruction from Law Dome, East Antarctica
South West Western Australia (SWWA) has experienced a prolonged reduction in rainfall in recent decades, with associated reductions in regional water supply and residential and agricultural impacts. The cause of the reduction has been widely considered but remains unclear. The relatively short lengt...
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ftunivtasecite:oai:ecite.utas.edu.au:147234 2023-05-15T13:42:40+02:00 Extending and understanding the South West Western Australian rainfall record using a snowfall reconstruction from Law Dome, East Antarctica Zheng, Y Jong, LM Phipps, SJ Roberts, JL Moy, AD Curran, MAJ van Ommen, TD 2021 application/pdf https://doi.org/10.5194/cp-17-1973-2021 http://ecite.utas.edu.au/147234 en eng Copernicus GmbH http://ecite.utas.edu.au/147234/1/147234 - Extending and understanding the South West Western Australian rainfall record.pdf http://dx.doi.org/10.5194/cp-17-1973-2021 Zheng, Y and Jong, LM and Phipps, SJ and Roberts, JL and Moy, AD and Curran, MAJ and van Ommen, TD, Extending and understanding the South West Western Australian rainfall record using a snowfall reconstruction from Law Dome, East Antarctica, Climate of the Past, 17, (5) pp. 1973-1987. ISSN 1814-9324 (2021) [Refereed Article] http://ecite.utas.edu.au/147234 Earth Sciences Climate change science Climate change processes Refereed Article PeerReviewed 2021 ftunivtasecite https://doi.org/10.5194/cp-17-1973-2021 2022-08-29T22:18:32Z South West Western Australia (SWWA) has experienced a prolonged reduction in rainfall in recent decades, with associated reductions in regional water supply and residential and agricultural impacts. The cause of the reduction has been widely considered but remains unclear. The relatively short length of the instrumental record limits long-term investigation. A previous proxy-based study used a statistically negative correlation between SWWA rainfall and snowfall from the Dome Summit South (DSS) ice core drilling site, Law Dome, East Antarctica, and concluded that the anomaly of recent decades is unprecedented over the ∼ 750-year period of the study (12502004 CE). Here, we extend the snow accumulation record to cover the period from 22 BCE to 2015 CE and derive a rainfall reconstruction over this extended period. This extended record confirms that the recent anomaly is unique in the period since 1250 CE and unusual over the full ∼ 2000-year period, with just two other earlier droughts of similar duration and intensity. The reconstruction shows that SWWA rainfall started to decrease around 1971 CE. Ensembles of climate model simulations are used to investigate the potential roles of natural variability and external climate drivers in explaining changes in SWWA rainfall. We find that anthropogenic greenhouse gases are likely to have contributed towards the SWWA rainfall drying trend after 1971 CE. However, natural variability may also have played a role in determining the timing and magnitude of the reduction in rainfall. Article in Journal/Newspaper Antarc* Antarctica East Antarctica ice core eCite UTAS (University of Tasmania) East Antarctica Law Dome ENVELOPE(112.833,112.833,-66.733,-66.733) Climate of the Past 17 5 1973 1987 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Climate change science Climate change processes |
spellingShingle |
Earth Sciences Climate change science Climate change processes Zheng, Y Jong, LM Phipps, SJ Roberts, JL Moy, AD Curran, MAJ van Ommen, TD Extending and understanding the South West Western Australian rainfall record using a snowfall reconstruction from Law Dome, East Antarctica |
topic_facet |
Earth Sciences Climate change science Climate change processes |
description |
South West Western Australia (SWWA) has experienced a prolonged reduction in rainfall in recent decades, with associated reductions in regional water supply and residential and agricultural impacts. The cause of the reduction has been widely considered but remains unclear. The relatively short length of the instrumental record limits long-term investigation. A previous proxy-based study used a statistically negative correlation between SWWA rainfall and snowfall from the Dome Summit South (DSS) ice core drilling site, Law Dome, East Antarctica, and concluded that the anomaly of recent decades is unprecedented over the ∼ 750-year period of the study (12502004 CE). Here, we extend the snow accumulation record to cover the period from 22 BCE to 2015 CE and derive a rainfall reconstruction over this extended period. This extended record confirms that the recent anomaly is unique in the period since 1250 CE and unusual over the full ∼ 2000-year period, with just two other earlier droughts of similar duration and intensity. The reconstruction shows that SWWA rainfall started to decrease around 1971 CE. Ensembles of climate model simulations are used to investigate the potential roles of natural variability and external climate drivers in explaining changes in SWWA rainfall. We find that anthropogenic greenhouse gases are likely to have contributed towards the SWWA rainfall drying trend after 1971 CE. However, natural variability may also have played a role in determining the timing and magnitude of the reduction in rainfall. |
format |
Article in Journal/Newspaper |
author |
Zheng, Y Jong, LM Phipps, SJ Roberts, JL Moy, AD Curran, MAJ van Ommen, TD |
author_facet |
Zheng, Y Jong, LM Phipps, SJ Roberts, JL Moy, AD Curran, MAJ van Ommen, TD |
author_sort |
Zheng, Y |
title |
Extending and understanding the South West Western Australian rainfall record using a snowfall reconstruction from Law Dome, East Antarctica |
title_short |
Extending and understanding the South West Western Australian rainfall record using a snowfall reconstruction from Law Dome, East Antarctica |
title_full |
Extending and understanding the South West Western Australian rainfall record using a snowfall reconstruction from Law Dome, East Antarctica |
title_fullStr |
Extending and understanding the South West Western Australian rainfall record using a snowfall reconstruction from Law Dome, East Antarctica |
title_full_unstemmed |
Extending and understanding the South West Western Australian rainfall record using a snowfall reconstruction from Law Dome, East Antarctica |
title_sort |
extending and understanding the south west western australian rainfall record using a snowfall reconstruction from law dome, east antarctica |
publisher |
Copernicus GmbH |
publishDate |
2021 |
url |
https://doi.org/10.5194/cp-17-1973-2021 http://ecite.utas.edu.au/147234 |
long_lat |
ENVELOPE(112.833,112.833,-66.733,-66.733) |
geographic |
East Antarctica Law Dome |
geographic_facet |
East Antarctica Law Dome |
genre |
Antarc* Antarctica East Antarctica ice core |
genre_facet |
Antarc* Antarctica East Antarctica ice core |
op_relation |
http://ecite.utas.edu.au/147234/1/147234 - Extending and understanding the South West Western Australian rainfall record.pdf http://dx.doi.org/10.5194/cp-17-1973-2021 Zheng, Y and Jong, LM and Phipps, SJ and Roberts, JL and Moy, AD and Curran, MAJ and van Ommen, TD, Extending and understanding the South West Western Australian rainfall record using a snowfall reconstruction from Law Dome, East Antarctica, Climate of the Past, 17, (5) pp. 1973-1987. ISSN 1814-9324 (2021) [Refereed Article] http://ecite.utas.edu.au/147234 |
op_doi |
https://doi.org/10.5194/cp-17-1973-2021 |
container_title |
Climate of the Past |
container_volume |
17 |
container_issue |
5 |
container_start_page |
1973 |
op_container_end_page |
1987 |
_version_ |
1766171257734168576 |