Australia's science community is mourning the death of distinguished scientist Professor Michael Raupach.
The world-class researcher was appointed director of the ANU Climate Change Institute in early 2014 after a long career at the CSIRO.
He died after a brief illness, aged 64.
Professor Raupach was a CSIRO fellow and lead the organisation's Marine and Atmospheric Research division of the Continental Biogeochemical Cycles Research Team.
He was also a fellow of the Australian Academy of Science, the Australian Academy of Technological Sciences and Engineering, and the American Geophysical Union.
Between 2000 and 2008 Professor Raupach was an inaugural co-chair of the Global Carbon Project, an international project studying the natural and human influences on the global carbon cycle and its impact on climate.
Throughout his career Professor Raupach published more than 150 scientific papers and 50 reports and edited two books.
He was a contributing author of the Intergovernmental Panel on Climate Change Fourth Assessment Report.
ANU Vice-Chancellor Professor Ian Young said Professor Raupach made a tremendous contribution to climate research and the university.
"Mike was a dedicated scientist and wonderful science communicator," he said.
"He will be deeply missed by his many friends and colleagues both at the ANU and throughout Australia's science community."
Former Climate Change Institute director Professor Will Steffen led the tributes to Professor Raupach.
"Mike was an outstanding scientist, always rigorous and insightful," he said.
"He was brilliant at connecting his science with the policy community and with society generally, always with respect, dignity and thoughtfulness. He was a wonderful human being. We are all going to miss him very much."