Department of Geography, Environment and Geomatics

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Presentation transcript:

Department of Geography, Environment and Geomatics Holocene Climates K Gajewski Department of Geography, Environment and Geomatics University of Ottawa August 2016

Classical division of Holocene Climates in Europe

BP 2000 4000 6000 8000 10000 12000 14000 16000 From Hulme & Barrow. 1997. Climates of the British Isles. Routledge.

Global Temperature Curve This is the Holocene equivalent of the global temperature curve and the “Hockey Stick”

Average Global Temperatures for last 2ka (left) and 10ka (right) Estimated using different methods (top & bottom) Marcotte et al. 2013. Science

Average Global Temperatures Zonal means Marcotte et al. 2013. Science

Marcotte et al. 2013. Science

North American Mean temperature curve Milankovitch scale variability Millennial-scale regimes Comparison to European curve

Holocene Viau et al. 2006. J Geophysical Research 111, D09102,

Gajewski. 2008 Prog Phys Geogr 32:

Holocene climate sequence compared to full glacial

Millennial-scale climate variability: Europe Ruddiman book

Millennial-scale climate variability: off California Ruddiman book

Holocene Climates: Milankovitch scale

From Ruddiman text

Holocene Climates: Millennial scale

Glaciers

6k hydroclimate

6k compared to today Wanner et al. 2008. Quat Sci Rev 27:1791

Model output compared to Data

COHMAP. 1988. Science

COHMAP. 1988. Science

COHMAP. 1988. Science

Holocene regional time series

H. Wanner et al. / Quaternary Science Reviews 27 (2008) 1791–1828.

6 major cold periods in Holocene H. Wanner et al. / Quaternary Science Reviews 30 (2011) 3109-3123

6 major cold periods in Holocene Blue: cold Red: warm Grey: average Green: wet Brown: dry H. Wanner et al. / Quaternary Science Reviews 30 (2011) 3109-3123

Holocene climates causes

H. Wanner et al. / Quaternary Science Reviews 30 (2011) 3109-3123

Solar Activity, last 6000 years Wanner et al 2008

Solar Activity, last 3ka (upper); last 9ka (lower) Vieira et al. 2011. Astronomy & Astrophysics A6