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Antarctic Temperatures Stable Since 1800

May 29, 2014
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By Paul Homewood

 

Following up yesterday’s news that the Antarctic Peninsula has experienced more dramatic warming in the last 300 yeas, than in recent decades, comes similar news from the central Antarctic.

 

Ice core analysis shows that Antarctic climate runs in 30-50 year cycles, and that it was as warm as now around 1940, and in the 1800’s.

 

 

MULTIPLE CLIMATE SHIFTS IN THE SOUTHERN HEMISPHERE OVER THE PAST THREE CENTURIES BASED ON CENTRAL ANTARCTIC SNOW PITS AND CORE STUDIES

 

A.A. EKAYKIN, A.V. KOZACHEK, V.Ya. LIPENKOV, Yu.A. SHIBAEV

 

  Based on the results of geochemical and glaciological investigations in snow pits and shallow cores, regional stack series of air temperature in central Antarctica (in the southern part of Vostok Subglacial Lake) were obtained, covering the last 350 years. It is shown that this parameter varied quasi-periodically with a wavelength of 30–50 years. The correlation of the newly obtained record with the circulation indices of the Southern Hemisphere (SH) shows that the central Antarctic climate is mainly governed by the type of circulation in the SH: under conditions of zonal circulation, negative anomalies of temperature and precipitation rate are observed, whereas the sign of the anomalies is positive during meridional circulation. In the 1970s the sign of the relationship between many climatic parameters changed, which is likely related to the rearrangement of the climatic system of the SH. The data suggest that during the past 350 years such events have taken place at least five times. The stable water isotope content of the central Antarctic snow is governed by the summer temperature rather than the mean annual temperature, which is interpreted as the influence of ‘postdepositional’ effects

 

 

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http://www.igsoc.org/annals/55/66/a66A189.html

 

 

 

What does stick out is the sharp fall in both annual and summer temperatures between 1940 and 1960, and the subsequent sharp recovery by 1970.

This warming trend is well known, since Antarctic research stations, such as Vostok and Amundsen-Scott, began operating in 1957. As we have no such previous temperature data available, it has naturally been assumed that this warming was part of a long term trend.

This Ekaykin study suggests that the two decades of warming was no more than part of a stable cycle.

One Comment
  1. Keitho permalink
    May 29, 2014 5:16 pm

    Those poor frightened alarmists won’t like this.

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