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TZID:Europe/Berlin
TZUNTIL:20100328T010000Z
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TZNAME:CET
DTSTART:20071028T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RDATE:20081026T030000
RDATE:20091025T030000
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BEGIN:VEVENT
UID:www.bayceer.uni-bayreuth.de-bayceer-t60377id
DTSTAMP:20260910T185153Z
DESCRIPTION:Since the 19th century\, use of chemical methods has provided r
 eliable atmospheric CO2 gas analyses results that have been obtained predo
 minantly from the northern hemisphere. These direct chemical analyses resu
 lts provide information on past atmospheric CO2 concentrations in addition
  to the modern direct atmospheric CO2 measurements since 1958 and the indi
 rect reconstructions of past atmospheric CO2 from ice cores. Comprehensive
  literature indicates that the chemical methods have provided a systematic
  accuracy within ± 3 Vol% since 1857. Optimization through the 20th centur
 y resulted in numerous sampling round the world on land and sea resulting 
 in systematic sampling and analysis of more than 90\,000 CO2 values near g
 round\, sea surface and up to the stratosphere when around 1960 the modern
  NDIR spectroscopic method was introduced. Comparison of measurements usin
 g old wet chemical and new physical methods in 1958 and 1967 on sea and la
 nd reveal a systematic analysis difference of about 10 ppm - new procedure
 s compared to the old. Wet chemical analyses indicate that during the past
  2 centuries there were three atmospheric CO2 maxima in the northern hemis
 phere. These maxima were as high as about 400 ppm in average over land and
  sea. The chemical analysis results indicate that atmospheric CO2 concentr
 ation – including its peak around 1942 – has about 80% correlation with th
 e arctic sea surface temperature (SST) during the 20th century. Detailed a
 nalysis of CO2\, weather and oceanographic data during the arctic warming 
 since 1918 to 1939 indicate a strong warming of the Northern Arctic Ocean 
 with a subsequent decrease of CO2 absorption in distinct absorption hotspo
 ts (e.g. near Spitsbergen) as a cause of the increased decadal atmospheric
  CO2 levels that is not seen in the ice core records.
DTSTART;TZID=Europe/Berlin:20080717T161500
DTEND;TZID=Europe/Berlin:20080717T235959
LOCATION:H 6
SUMMARY:Ernst-Georg Beck\, Gymnasium Merian-Schule in Freising: Evidence of
  variability of atmospheric CO2 concentration during the 20th century
TRANSP:TRANSPARENT
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