Lisa Alexander wins Australian Academy of Science award
Submitted by astone on Wed, 01/16/2013 - 11:59
Dr Alexander is internationally recognised for her work on extreme climate events in Australia and around the world.
In particular, she has created high quality, global datasets of rainfall and temperature records, helping many countries to improve the collection of this vital information. She then analyses these records and uses the latest climate models to understand variations in the observations.
Her research shows that the number of heatwaves, such as the one we have just experienced, is likely to increase in Australia and around the world as the globe warms. However she emphasised that it was not possible to link a single event, such as the January heatwave in Australia, to climate change.
“But it is likely a sign of things to come. What we have thought of as normal in the past is going to be different in the future,” Dr Alexander said.
In a recent world-first study, carried out with Dr Markus Donat of UNSW, she found that extremely hot temperatures around the world are 40 per cent more common now than 60 years ago.
“The observations showed a clear warming shift in temperatures and a marked increase in extreme hot weather events,” she said.
Her research shows that while natural climate variations play a significant role in modulating temperature and rainfall extremes, strong evidence exists that increases in warm nights in Australia and globally are related to increases in greenhouse gas emissions.
“In fact we can’t explain the increase in hot nights if we only include the natural variations that we understand in the climate system,” Dr Alexander said.
Dr Alexander is member of the World Meteorological Organisation’s Expert Team on Climate Change Detection and Indices. In this capacity she has assisted scientists in developing countries to collate and analyse their own high quality rainfall and temperature records.
Her work contributed significantly to the conclusions of the Fourth Assessment Report of the Intergovernmental Panel on Climate Change Working Group 1 on the physical basis of climate change, and she is a lead author on the next report, due in September 2013.
Last year she received the Priestley Medal from the Australian Meteorological and Oceanographic Society, which recognises excellence in research by younger scientists.