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Blobrana


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RE: Medieval Warm Period
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So-Called Medieval Warm Period Not So Warm After All

The so-called Medieval Warm Period (MWP), a 400-year span from about 950 to 1220 A.D. when the Vikings colonized Greenland, was relatively balmy by the standards of the past 2,000 years, leading some to argue that the global warming we're now experiencing isn't that big a deal. But a new report in the journal Geology argues that the MWP wasn't all that warm after all - and certainly not as warm as the climate is today.
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Blobrana


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Title: A Note on Solar Cycle Length during the Medieval Climate Anomaly
Authors: J. M. Vaquero, R. M. Trigo

The growing interest in the "Medieval Climate Anomaly" (MCA) and its possible link to anomalous solar activity has prompted new reconstructions of solar activity based on cosmogenic radionuclides. These proxies however do not sufficiently constrain the Total Solar Irradiance (TSI) range, and are often defined at low temporal resolution, inadequate to infer the solar cycle length (SCL). We have reconstructed the SCL (average duration of 10.72 ± 0.20 years) during the MCA using observations of naked-eye sunspot and aurora sightings. Thus, solar activity was most probably not exceptionally intense, supporting the view that internal variability of the coupled ocean-atmosphere system was the main driver of MCA.

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