Seasonal climate summary for the southern hemisphere (autumn 2018): a weak La Niña fades, the austral autumn remains warmer and drier
This is a summary of the austral autumn 2018 atmospheric circulation patterns and meteorological indices for the southern hemisphere, including an exploration of the season's rainfall and temperature for the Australian region. The weak La Niña event during summer 2017–18 was in retreat as the s...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:4febcca88d8f4885846010170181b089 2023-05-15T14:04:02+02:00 Seasonal climate summary for the southern hemisphere (autumn 2018): a weak La Niña fades, the austral autumn remains warmer and drier Katie Rosemond Bernard Chapman 2020-01-01 https://doaj.org/article/4febcca88d8f4885846010170181b089 en eng CSIRO Publishing 2206-5865 https://doaj.org/article/4febcca88d8f4885846010170181b089 undefined Journal of Southern Hemisphere Earth Systems Science, Vol 70, Iss 1, Pp 328-352 (2020) 2018 Antarctic sea ice autumn climate summary El Niño ENSO geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2020 fttriple 2023-01-22T19:08:29Z This is a summary of the austral autumn 2018 atmospheric circulation patterns and meteorological indices for the southern hemisphere, including an exploration of the season's rainfall and temperature for the Australian region. The weak La Niña event during summer 2017–18 was in retreat as the southern hemisphere welcomed the austral autumn, and before midseason, it had faded. With the El Niño Southern Oscillation and the Indian Ocean Dipole in neutral phases, their influence on the climate was weakened. Warmer than average sea surface temperatures dominated much of the subtropical South Pacific Ocean and provided favourable conditions for the formation of a rare subtropical cyclone over the southeast Pacific Ocean in May. The southern hemisphere sea ice extent was slightly below the autumn seasonal average. The southern hemisphere overall during autumn was drier and warmer than the seasonal average. The season brought warmer than average temperatures and average rains to parts of the continents of Africa and South America. Australia recorded its fourth-warmest autumn, partly due to an intense, extensive and persistent heatwave, which occurred during the midseason. An extraordinary and record-breaking rainfall event occurred over Tasmania's southeast, under the influence of a negative Southern Annular Mode. The mainland's northeastern tropical region was wetter than average as a result of tropical cyclones, which formed during an active monsoon. These areas, however, were in contrast to the rest of the continent, which followed the trend of the previous season and remained drier than average; consequently, rainfall deficiencies emerged across the southern half of Australia, and some areas witnessed an increase in extent and severity of these deficiencies. Article in Journal/Newspaper Antarc* Antarctic Sea ice Unknown Antarctic Austral Indian Pacific |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
2018 Antarctic sea ice autumn climate summary El Niño ENSO geo envir |
spellingShingle |
2018 Antarctic sea ice autumn climate summary El Niño ENSO geo envir Katie Rosemond Bernard Chapman Seasonal climate summary for the southern hemisphere (autumn 2018): a weak La Niña fades, the austral autumn remains warmer and drier |
topic_facet |
2018 Antarctic sea ice autumn climate summary El Niño ENSO geo envir |
description |
This is a summary of the austral autumn 2018 atmospheric circulation patterns and meteorological indices for the southern hemisphere, including an exploration of the season's rainfall and temperature for the Australian region. The weak La Niña event during summer 2017–18 was in retreat as the southern hemisphere welcomed the austral autumn, and before midseason, it had faded. With the El Niño Southern Oscillation and the Indian Ocean Dipole in neutral phases, their influence on the climate was weakened. Warmer than average sea surface temperatures dominated much of the subtropical South Pacific Ocean and provided favourable conditions for the formation of a rare subtropical cyclone over the southeast Pacific Ocean in May. The southern hemisphere sea ice extent was slightly below the autumn seasonal average. The southern hemisphere overall during autumn was drier and warmer than the seasonal average. The season brought warmer than average temperatures and average rains to parts of the continents of Africa and South America. Australia recorded its fourth-warmest autumn, partly due to an intense, extensive and persistent heatwave, which occurred during the midseason. An extraordinary and record-breaking rainfall event occurred over Tasmania's southeast, under the influence of a negative Southern Annular Mode. The mainland's northeastern tropical region was wetter than average as a result of tropical cyclones, which formed during an active monsoon. These areas, however, were in contrast to the rest of the continent, which followed the trend of the previous season and remained drier than average; consequently, rainfall deficiencies emerged across the southern half of Australia, and some areas witnessed an increase in extent and severity of these deficiencies. |
format |
Article in Journal/Newspaper |
author |
Katie Rosemond Bernard Chapman |
author_facet |
Katie Rosemond Bernard Chapman |
author_sort |
Katie Rosemond |
title |
Seasonal climate summary for the southern hemisphere (autumn 2018): a weak La Niña fades, the austral autumn remains warmer and drier |
title_short |
Seasonal climate summary for the southern hemisphere (autumn 2018): a weak La Niña fades, the austral autumn remains warmer and drier |
title_full |
Seasonal climate summary for the southern hemisphere (autumn 2018): a weak La Niña fades, the austral autumn remains warmer and drier |
title_fullStr |
Seasonal climate summary for the southern hemisphere (autumn 2018): a weak La Niña fades, the austral autumn remains warmer and drier |
title_full_unstemmed |
Seasonal climate summary for the southern hemisphere (autumn 2018): a weak La Niña fades, the austral autumn remains warmer and drier |
title_sort |
seasonal climate summary for the southern hemisphere (autumn 2018): a weak la niña fades, the austral autumn remains warmer and drier |
publisher |
CSIRO Publishing |
publishDate |
2020 |
url |
https://doaj.org/article/4febcca88d8f4885846010170181b089 |
geographic |
Antarctic Austral Indian Pacific |
geographic_facet |
Antarctic Austral Indian Pacific |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_source |
Journal of Southern Hemisphere Earth Systems Science, Vol 70, Iss 1, Pp 328-352 (2020) |
op_relation |
2206-5865 https://doaj.org/article/4febcca88d8f4885846010170181b089 |
op_rights |
undefined |
_version_ |
1766274977717288960 |