One Nation Senator corrected by NASA chief

ONE Nation Senator Malcolm Roberts has been personally rebuked by a senior NASA official over claims the space-agency had manipulated data. 

Mr Roberts' claims NASA had removed climate data from the 1940s in order to mask global warming in the Arctic were at the centre of the stoush. 

"You appear to hold a number of misconceptions which I am happy to clarify at this time," NASA official Gavin Schmidt told Senator Roberts in letters and emails obtained by Fairfax Media.

"The claim that GISS has 'removed the 1940s warmth' in the Arctic is not correct."

Dr Schmidt went on to explain why NASA had undertaken a process in which temperature figures were altered. 

"Homogenization of the raw temperature records is a necessary task to ensure that non-climatic influences in the analysis are minimised as much as possible," Dr Scmidt wrote.  

"These adjustments (for station moves, instrumentation changes, urban heat island effects etc.) are estimated via comparisons with neighboring stations and using relevant metadata. If we were not to adjust for these effects, we would be rightly criticized for using uncorrected data."

A spokesman for Senator Roberts said the letter was only received this weekend and would be "reviewed."



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