3 A Longstanding Controversy All GCMs current & past (realistic historical forcings): –Lower atmosphere (troposphere) warms more than surface –Maximum warming upper troposphere (tropics) Some observed datasets (satellite & radiosonde) –More warming at the surface than aloft (opposite of GCMs) Cause of the discrepancy (largely) –Unresolved errors in observed data This talk –Problems with radiosonde data
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