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Evidence for a 'Medieval Warm Period' in a 1,100 year tree-ring
reconstruction of past austral summer temperatures in New Zealand
Cook, E R | Palmer, J G | D'Arrigo, R
Geophysical Research Letters. Vol. 29, no. 14, pp. 12-1 to 12-4.
15 July 2002
The occurrence of the Medieval Warm Period (MWP) in the Southern
Hemisphere is uncertain because of the paucity of well-dated,
high-resolution paleo-temperature records covering the past 1000
years. We describe a new tree-ring reconstruction of Austral
summer temperatures from the South Island of New Zealand, covering
the past 1100 years. This record is the longest yet produced for
New Zealand and shows clear evidence for persistent above-average
temperatures within the interval commonly assigned to the MWP.
Comparisons with selected temperature proxies from the Northern
and Southern Hemispheres confirm that the MWP was highly variable
in time and space. Regardless, the New Zealand temperature
reconstruction supports the global occurrence of the MWP. (Author)
 Descriptors: PALEOCLIMATOLOGY | SECULAR VARIATIONS | ATMOSPHERIC TEMPERATURE | DATA RECORDING | ATMOSPHERIC HEATING | NEW ZEALAND | SUMMER | GLOBAL
WARMING
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