[Aqualist] Adelaide seminar on Holocene Northern Hemisphere temperature and precipitation

[John Tibby]

Dear colleagues,

Professor Darrell Kaufman will give a seminar this Thursday (24th Jan) at 2:10 pm in the Braggs seminar room 313, University of Adelaide.

Holocene evolution of the Northern Hemisphere temperature gradient and its relation to mid-latitude net precipitation

Abstract
The latitudinal temperature gradient (LTG) between the equator and the poles influences extratropical hydroclimate. Recent global warming is weakening the Northern Hemisphere surface LTG by preferentially warming the high latitudes, with uncertain implications. Paleoclimate archives spanning the Holocene provide an opportunity to study the relation between the LTG and mid-latitude hydroclimate. The evolution of the LTG and mid-latitude moisture was quantified in both an extensive new compilation of Holocene paleoclimate records spanning from 10°S to 90°N, and in an ensemble of mid-Holocene climate model simulations (PMIP3, 6 ka time slice). The proxy data show that a weaker LTG (warming of the Arctic with respect to the equator) during the early to middle part of Holocene coincided with substantial decreases in mid-latitude (30°-50°N) net precipitation. The observed pattern is consistent with the hypothesis that a weaker LTG led to weaker mid-latitude westerly flow and decreased net terrestrial mid-latitude precipitation. Currently the northern high latitudes are warming at rates nearly double the global average, decreasing the equator-to-pole temperature gradient to values comparable with the early to middle Holocene.



Details about Professor Kaufman:

Darrell Kaufman, Regents' Professor
Webpage: https://www2.nau.edu/~dsk5/

School of Earth Sciences and Environmental Sustainability
Northern Arizona University, Flagstaff, Arizona

PhD, 1991, University of Colorado, Geological Sciences

Lead Author, 2018-2021, Inter-governmental Panel on Climate Change, Assessment Report 6, Working Group 1, Chapter 2 (Changing State of the Climate System)

Member, Executive Committee and Science Steering Committee, 2015-present, Past Global Changes (PAGES), a core global research project of Future Earth.

Leader, 2016-present, Past Global Changes (PAGES) Data Stewardship Integrative Activity

Leader, 2012-2016, Arctic Holocene Transitions.

Co-leader, 2012-2016, PAGES 2k Network

Leader, 2005-2009, 2000 Years of Climate Variability from Arctic Lakes.

Co-editor, PAGES Magazine 26(2), "Building and Harnessing Open Paleodata," http://pastglobalchanges.org/products/pages-magazine/12705

Co-editor, 2018, Climate of the past 2000 years: regional and trans-regional syntheses. Climate of the Past, https://www.clim-past.net/special_issue841.html

Co-editor, 2013, Amino acid geochronology: Recent perspectives. Quaternary Geochronology 16, 198 pp.

Editor, 2012, Holocene paleoenvironmental records from Arctic lake sediment. Journal of Paleolimnology 48-1, 286 pp.

Editor, 2009, Late Holocene climate and environmental change inferred from Arctic lake sediment. Journal of Paleolimnology 9-1, 242 pp.

Co-editor, 2009, Paleoenvironments of Bear Lake, Utah and Idaho, and its catchment.
Geological Society of America Special Paper 450, 351 pp.

Founding co-editor, 2006-2017, Quaternary Geochronology.

For more details about Darrel please see this link:
https://www2.nau.edu/~dsk5/




__________________________________________
Please note I usually don't check emails before 11:00 am

Associate Professor John Tibby

Department of Geography, Environment and Population
School of Social Sciences
Faculty of Arts

and

Director, Sprigg Geobiology Centre

University of Adelaide
Phone: +61 (0)8 8313-5146<tel:%2B61%20%280%298%208313-5146>
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