alexa The spatial extent of 20th-century warmth in the context of the past 1200 years.
Environmental Sciences

Environmental Sciences

Journal of Climatology & Weather Forecasting

Author(s): Osborn TJ, Briffa KR

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Abstract Periods of widespread warmth or cold are identified by positive or negative deviations that are synchronous across a number of temperature-sensitive proxy records drawn from the Northern Hemisphere. The most significant and longest duration feature during the last 1200 years is the geographical extent of warmth in the middle to late 20th century. Positive anomalies during 890 to 1170 and negative anomalies during 1580 to 1850 are consistent with the concepts of a Medieval Warm Period and a Little Ice Age, but comparison with instrumental temperatures shows the spatial extent of recent warmth to be of greater significance than that during the medieval period. This article was published in Science and referenced in Journal of Climatology & Weather Forecasting

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