|Storm activity shown in 2nd graph from top was much greater and more variable during the Little Ice Age in comparison to the Medieval Warm Period and the 20th century. Top graph shows one of Mann's bogus hockey sticks in red, and another non-hockey-stick reconstruction in grey [Moberg et al 2005]. |
Fig. 8. Multiple proxies of environmental change in Iceland AD 700–2000. (a) Two multi-proxy temperature reconstructions, North Atlantic sea surface temperatures (SST, ) and . (b) Shows GISP2 Na+ deviations from the mean, a proxy for storminess (). Cumulative deviations from the mean show a shift to stormier and windier conditions around AD 1425 (). (c) Changes in total organic carbon at Lake Haukadalsvatn, west Iceland used as a proxy for aeolian erosion (). Bold horizontal bars show means over periods matching key tephra horizons in study (see ). (d) Woodland cover is represented by Betulapollen percentages from a lake core near Lake Mývatn, north Iceland () and charcoal pits present in south Iceland () (e) Mean aggregate SeAR from Skaftártunga for period separated by dated tephra layers, with 1 standard deviation show by grey shading. Mean calculated where n = >10. (f) Mean aggregate SeAR at the scale of the landholding, from two small landholdings (Hrífunes and Flaga, see d). (g) Change in SeAR at the landscape scale, 2 stratigraphic sections which record the onset of increased erosion at AD 1597, but profile 38 shows stability through the entire settlement period prior to AD 1918. (h) Population trends in Iceland. Prior to the first census in AD 1703 estimates are based on medieval populations being similar to or even higher than the population in AD 1703 (90 and 43). Plague reductions of ∼40% in AD 1402–1404 and ∼30% in AD 1496 are shown ().
Tuesday, January 21, 2014
New paper shows global warming decreases storm activity and extreme weather
A paper published today in Quaternary Science Reviews reconstructs storm activity in Iceland over the past 1,200 years and finds storminess and extreme weather variability was far more common during the Little Ice Age in comparison to the Medieval Warm Period and the 20th century. The paper adds to many other peer-reviewed publications finding global warming decreases storm activity, the opposite of claims by climate alarmists.
Posted by MS at 4:06 PM