Abstract
Long-term changes in the low-level tropospheric inversion layer are investigated using nearly 30 000 Arctic Ocean temperature profiles for 1950–1990. The profile measurements were made by radiosonde at the former USSR ‘North Pole’ series of drifting ice stations, and by dropsonde from US Air Force ‘Ptarmigan’ weather reconnaissance aircraft. Significant increases in the temperature difference across the inversion layer are found during winter and autumn, indicating a strengthening of the thermal stability of the layer. This strengthening is in agreement with a recent study describing Arctic Ocean temperature trends, but is in contrast to general circulation model predictions of polar amplification of greenhouse-induced warming. The frequency with which inversion layers occur has increased, with inversions tending to be more elevated above the ice surface. Decreases in inversion layer depth reported by other investigations using similar sounding data sets are not confirmed.
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