northwest Historical temperature reconstructions show hemispheric differences
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australian electronic gold prospecting forum.com  |  Off topic  |  Off topic  |  Climate change  |  Topic: Historical temperature reconstructions show hemispheric differences 0 Members and 1 Guest are viewing this topic. « previous next »
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« on: Monday October 7 2019 10:23:36 AEDT AM »

Historical temperature reconstructions show hemispheric differences
Climate scientists have found that temperature variations in the northern and southern hemispheres over the past 1000 years are not as synchronised as previously thought, with implications for future climate modelling
  
Link-http://www.antarctica.gov.au/magazine/2011-2015/issue-26-june-2014/science/historical-temperature-reconstructions-show-hemispheric-differences
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« Reply #1 on: Friday October 18 2019 09:44:25 AEDT AM »

an extract from this publication

The team compared this to an independent Northern Hemisphere temperature reconstruction. They found that both the northern and southern hemispheres shared an extended cold period between 1571 and 1722 (known as the ‘Little Ice Age’), but there were differences in the existence, timing and phase of warm and cold periods throughout the rest of the millennium.

The most striking difference was the absence in the Southern Hemisphere of the Medieval Warm Period, between 950 and 1250 AD.

‘This means that the Medieval Warm Period, which was previously observed in Northern Hemisphere-centric reconstructions of temperature, is not, as is often suggested, a worldwide phenomenon, ‘ Dr Vance said.

‘In fact, there is no globally synchronised warm phase during the pre-industrial era, between 1000 and 1850.

The key phrase in this publication is this
However, since the 1850s both hemispheres have experienced synchronous warming, with modern warming extremes evident from 1979 in more than 90% of the proxy records used.
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