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Reducing carbon emissions not enough, expert warns
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Reducing carbon emissions just not enough, ANU expert warns
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Australia s hidden history of megadroughts captured in ancient tree rings By Ben Deacon © Provided by ABC NEWS South-west Western Australia experienced droughts of more than 30 years in past centuries, a new study shows. (ABC News: Andrew O Connor)
Scientists analysing growth rings of 700-year-old in native cypress trees in Western Australia s Wheatbelt say the region suffered a series of megadroughts lasting up to 30 years in past centuries.
The study has also suggested the region was comparatively blessed with rain during the 20th century.
Climatologist Alison O Donnell said rainfall records since 1900 capture one of the wettest periods in the last 700 years . The worst drought periods that have occurred in this region occurred prior to instrumental records, she said.
Climate change is expanding Antarctica s sea ice, according to a scientific study in the journal Nature Geoscience.
The paradoxical phenomenon is thought to be caused by relatively cold plumes of fresh water derived from melting beneath the Antarctic ice shelves.
This melt water has a relatively low density, so it accumulates in the top layer of the ocean.
The cool surface waters then re-freeze more easily during Autumn and Winter.
This explains the observed peak in sea ice during these seasons, a team from the Royal Netherlands Meteorological Institute (KNMI) in De Bilt says in its
.
Climate scientists have been intrigued by observations that Antarctic sea ice shows a small but statistically significant expansion of about 1.9% per decade since 1985, while sea ice in the Arctic
La Niña drives cooler temperatures, high rainfall during Australian summer
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Australia experienced almost a third more rain than average this summer, driving temperatures down.
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Australia recorded its wettest summer in half a decade and its coolest in nine years as La Niña snapped an eight-year hot streak in 2020-21.
Key points:
Australia s mean summer temperature was 0.06C above average â the coolest in nine years
La Niña drove the cooler, wetter conditions, but experts say its ability to counteract the warming climate is less and less
Globally, 2021 saw the sixth hottest January since records began
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