Meeting Products
This report resulted from a PAGES co-sponsored workshop held from 21-23 April 1993 in Taipei, Taiwan.
Report from the 1st PAGES workshop on Global Paleoenvironmental Data in Bern, Switzerland in August 1993.
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Abstract
Current understanding of global temperature and sea-level change over the Plio-Pleistocene remains poorly constrained and highly uncertain. We address these issues by reconstructing regional and global temperature evolution using ~120 published SST records that span some to all of the last 4.5 Myr. We use the resulting globally averaged SST difference to derive differences in global mean surface temperature and mean ocean temperature. We subtract reconstructed changes in mean ocean temperature from a global benthic oxygen isotope stack to derive the oxygen isotopic composition of seawater. We then reconstruct global mean sea level from our seawater isotope record by accounting for temperature effects on the isotopic composition of the main global ice sheets. Our reconstructions suggest that global cooling between 4.0-0.8 Ma was accompanied by intensification of Northern Hemisphere glaciation by 2.5 Ma, with subsequent fluctuations of large, LGM-like ice sheets occurring under a range of temperatures and temperature variability. These results present fundamental challenges to our understanding of ice sheet-climate interactions, including controls on ice-sheet inception and growth, and require a reassessment of hypotheses for the middle Pleistocene transition that invoke an increase in ice-sheet volume.
Item Type
Conference (Talk)
Authors
Shakun, J., Clark, P. U., Rosenthal, Y., Köhler, Peter , Schrag, D., Pollard, D., Hostetler, S., Liu, Z., Bartlein, P., Pisias, N. and Mix, H.
Divisions
AWI Organizations > Geosciences > Glaciology
Primary Division
Organizations > AWI Organizations > Geosciences > Glaciology
Programs
Helmholtz Research Programs > CHANGING EARTH (2021-2027) > PT2:Ocean and Cryosphere in Climate > ST2.1: Warming Climates
Primary Topic
Helmholtz Programs > Helmholtz Research Programs > CHANGING EARTH (2021-2027) > PT2:Ocean and Cryosphere in Climate > ST2.1: Warming Climates
Publication Status
Published
Event Details
PALSEA 2022: Paleo sea level and ice sheets for Earth's future, 17 Jul 2022 - 20 Jul 2022, Singapore.
Eprint ID
57154
While the area burnt by wildfires has declined globally over the past decades, fire is now occurring more frequently and severely in ecosystems that have historically rarely experienced fire. This issue brief examines the cause and sustainability implications of global fires and stems from the policy brief from PAGES' Global Paleofire Working Group 2.
The inaugural Our Future on Earth report provides a narrative on the current state of our planet and the future that our global society is building together. It is a global effort, with authors and an editorial board from over 20 countries, targetting decision-makers, media, educators and more, to help shape the narrative and advance global action.
Community engagement highlights from the PEOPLE 3000 workshop held in Vernal, UT, USA, 20-24 May 2019
Members of the PAGES Global Paleofire Working Group 2 (GPWG2), together with another 30 international colleagues, released this Policy Brief discussing how the integration of traditional ecological knowledge and long-term ecology could better support the evidence base for future decisions on fire policy and biodiversity conservation.
This workshop report is a result of the PAGES' Global Paleofire Working Group 2 workshop, titled "Diverse knowledge systems for fire policy and biodiversity conservation" held in Egham, UK, from 4–7 September 2018.
This workshop report is a result of the first PAGES C-SIDE working group workshop, held in Vancouver, Canada, from 24–26 October 2018.