More than 1,700 scientists have signed a statement to defend global warming research.
The petition has been organised by the Met Office in the wake of the stolen emails row.
The experts became concerned after climate change sceptics seized on material taken from servers at the University of East Anglia's Climatic Research Unit to claim researchers have been manipulating evidence to support a theory of man-made global warming.
The statement signed by the scientists said: "We, members of the UK science community, have the utmost confidence in the observational evidence for global warming and the scientific basis for concluding that it is due primarily to human activities."
The move comes as representatives from 190 countries are gathered in Copenhagen for crucial UN climate change talks.
A Met Office spokesman confirmed a report in The Times that John Hirst, its chief executive, and Julia Slingo, its chief scientist, wrote to 70 colleagues on Sunday asking them to sign "to defend our profession against this unprecedented attack to discredit us and the science of climate change".
They asked them to forward the petition to colleagues to generate support "for a simple statement that we... have the utmost confidence in the science base that underpins the evidence for global warming".
The University of East Anglia has appointed Scottish civil servant and former principal and vice-chancellor of the University of Glasgow, Sir Muir Russell, to head an independent review into the email allegations.
The investigation will look at the leaked email exchanges to see if there is any evidence of manipulation or suppression of data which would call into question the research findings of the centre.
The centre's director, Professor Phil Jones, has said he will stand down from the post while the independent inquiry takes place.
