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Volume 8, Issue 10 (Suppl)
J Earth Sci Clim Change, an open access
ISSN: 2157-7617
Climate Change 2017
October 19-21, 2017
Page 25
Notes:
conference
series
.com
CLIMATE CHANGE
October 19-21, 2017 | Rome, Italy
4
th
World Conference on
Nils-Axel Morner, J Earth Sci Clim Change 2017, 8:10(Suppl)
DOI: 10.4172/2157-7617-C1-035
Climate change: Evidence of holocene high-Amplitude events
I
n geology we have a long-term tradition to base our statements and conclusions on observational facts in nature itself. When
it comes to climate change during the Holocene, we have very fine observational records in Scandinavia giving evidence of
high-amplitude changes and past temperature 2.5 °C warmer than today. Studies of past changes in climate have always been
a natural part geology. Already in 1902, Gunnar Anderson [1] was able to demonstrate that climate in Sweden was 2.4 °C
warmer than today in Mid Holocene time. During this period marsh turtle, water caltrop and Gotland ag were found in lakes
and bogs in southern Sweden. A temperature about 2.5 °C warmer than today was further strengthened by the findings of casts
of grape seeds in pottery from the Vrå Culture (~6000 BP). In the mountains pine logs from about 9000 BP are found 200 m
above the present tree line. With the onset of the Sub-Atlantic period at about 500 BC, climate deteriorated (cooler and wetter).
So-called “recurrence surfaces” in peat bogs provide evidence of dry and warm event of multi-decadal duration (50 years, or
so), recorded at 1050 AD, 500 AD, 550 BC, 1200 BC and 2300 BC [2, 3, 4]. These events were all warmer and dryer than today.
A stable isotope record from lake Tingstäde Träsk on Gotland [5] provided a continual temperature record of the Holocene;
present day temperature was reached 9000 years ago and the Mid Holocene had a temperature 2.5 °C warmer than today. This
is in full agreement with the temperature records from Greenland. These records indicate that the present, post-1980, warming
is by no means unique; neither in amplitude nor in rate of change.Consequently, there is no scientific reason to advocate an
anthropogenic forcing for the present warming.
Biography
Nils-Axel Morner took his Ph.D. in Quaternary Geology at Stockholm University in 1969. Head of the institute of Paleogeophysics & Geodynamics (P&G) at Stockholm
University from 1991 up to his retirement in 2005. He has written many hundreds of research papers and several books. He has presented more than 500 papers at major
international conferences. He has undertaking field studies in 59 different countries. The P&G institute became an international center for global sea level change, paleo-
climate, paleoseismics, neotectonics, paleomagnetism, Earth rotation, planetary-solar-terrestrial interaction, etc. Among his books; Earth Rheology, Isostasy and Eustasy
(Wiley, 1984), Climate Change on a Yearly to Millennial Basis (Reidel, 1984), Paleoseismicity of Sweden: a novel paradigm (P&G-print, 2003), The Greatest Lie Ever Told
(P&G-print, 2007), The Tsunami Threat: Research & Technology (InTech, 2011), Geochronology: Methods and Case Studies (InTech, 2014), Planetary Influence on the
Sun and the Earth, and a Modern Book-Burning (Nova, 2015).
morner@pog.nuNils-Axel Morner
Paleogeophysics & Geodynamics, Sweden