Press Releases

Apr-16

2k Network

Authors:
Fredrik Charpentier Ljungqvist, Paul J. Krusic, Hanna S. Sundqvist, Eduardo Zorita, Gudrun Brattström & David Frank

Paper:
Northern Hemisphere hydroclimate variability over the past twelve centuries

Publication:
Nature Vol. 532, pp. 94–98. Published online 6 April 2016. doi: 10.1038/nature17418; http://www.nature.com/nature/journal/v532/n7597/full/nature17418.html

Link:
http://pastglobalchanges.org/ini/wg/2k-network/nature-2k-apr-2016

Description:
Our article presents the first Northern Hemisphere hydroclimate multi-proxy reconstruction extending more than a millennium back in time. Secondly, our study shows that there have been larger long-term changes in hydroclimate anomalies during earlier centuries of the past twelve than during the 20th century. We also reveal that the natural long-term variability of hydroclimate is larger than often previously assumed. Our most significant result, however, is likely the finding that state-of-the-art climate model simulations tend to overestimate the increase of wet and dry anomalies during the 20th century compared to what we find in the reconstruction.

Feb-16

Euro-Med2k

Authors:
Büntgen U, Myglan VS, Charpentier Ljungqvist F, McCormick M, Di Cosmo N, Sigl M, Jungclaus J, Wagner S, Krusic PJ, Esper J, Kaplan JO, de Vaan MAC, Luterbacher J, Wacker L, Tegel W & Kirdyanov AV

Paper:
Cooling and societal change during the Late Antique Little Ice Age from 536 to around 660 CE

Publication:
Nature Geoscience 9, pp. 231-236. Published online 8 February 2016. Doi: 10.1038/ngeo2652; http://www.nature.com/ngeo/journal/v9/n3/full/ngeo2652.html

Link:
http://pastglobalchanges.org/ini/wg/euro-med2k/nature-geoscience-2016-faqs

Description:
New research suggests links between a century-long deep freeze across Europe and central Asia with famine, large-scale migration, a plague pandemic that ripped through the Eastern Roman Empire, and the expansion of the Arab Empire.

Jan-16

Euro-Med2k

Authors:
Luterbacher J et. Al

Paper:
European summer temperatures since Roman times

Publication:
Environmental Research Letters Vol 11, No.2. Doi: 10.1088/1748-9326/11/1/024001; http://iopscience.iop.org/article/10.1088/1748-9326/11/2/024001

Link:
http://pastglobalchanges.org/ini/wg/euro-med2k/erl-faqs-january-2016

Description:
Recent summer temperatures in Europe are likely the warmest of the last two millennia. Most of Europe has experienced strong summer warming over the course of the past several decades, accompanied by severe heat waves in 2003, 2010 and 2015. New research now puts the current warmth in a 2100-year historical context using tree-ring information and historical documentary evidence to derive a new European summer temperature reconstruction.

Aug-15

Ocean2k

Authors:
McGregor H et al.

Paper:
Robust global ocean cooling trend for the pre-industrial Common Era

Publication:
Nature Geoscience 8, pp. 671-677. Published online 17 August 2015. Doi: 10.1038/NGEO2510; http://www.nature.com/ngeo/journal/v8/n9/full/ngeo2510.html

Link:
http://pastglobalchanges.org/ini/wg/ocean2k/ocean2k-nat-geo

Description:
Frequent volcanic eruptions likely cause of long‐term ocean cooling. Researchers found an 1800 year‐long cooling trend in the surface layer of the Earth’s oceans, and that volcanic eruptions were the likely cause of this cooling from 801 to 1800 AD.

Jul-15

PALSEA2

Authors:
Dutton A, Carlson AE, Long AJ, Milne GA, Clark PU, DeConto R, Horton BP, Rahmstorf S & Raymo ME

Paper:
Sea-level rise due to polar ice-sheet mass loss during past warm periods

Publication:
Science, Vol 349 Issue 6244. Published 10 July 2015. Doi: 10.1126/science.aaa4019; http://science.sciencemag.org/content/349/6244/aaa4019.full

Link:
http://www.pastglobalchanges.org/products/6836-sea-level-rise-polar-ice-sheet

Description:
Present temperature targets may commit Earth to at least 6 metres sea-level rise. Three times in the recent geological past, sea levels were at least 6 metres higher than current levels when global average temperatures were similar to today, according to research in the journal Science . The researchers, part of the international Past Global Changes project, analysed sea levels during several warm periods in Earth’s recent history when global average temperatures were similar to or slightly warmer than today – about 1 °C above pre industrial temperatures.

Jun-13

NICOPP

Authors:
Galbraith ED, Kienast M and NICOPP working group members

Paper:
The acceleration of oceanic denitrification during deglacial warming

Publication:
Nature Geoscience. Published online 2 June 2013. Doi: 10.1038/NGEO1832; http://www.nature.com/ngeo/journal/v6/n7/full/ngeo1832.html

Link:
http://www.pastglobalchanges.org/news/all-news-items/9-latest-news/85-ocean-nitrogen-paper

Description:
Paleo nitrogen-cycle shifts may shed light on current oceanic changes. As Earth started warming after the peak of the last ice age, 18,000 years ago, the ocean's nitrogen cycle began speeding up, eventually stabilizing 10,000 years later at a faster rate, say an international team of forty researchers in the journal Nature Geoscience. The result confirms the ocean is an effective self-regulator with respect to nitrogen, a major nutrient, but reaching equilibrium after a disturbance can take hundreds or thousands of years, a concern given the scale and speed of current anthropogenic change.

Apr-13

2k Network

Authors:
PAGES 2k consortium

Paper:
Continental-scale Temperature Variability During the Past Two Millennia

Publication:
Nature Geoscience 6, 339–346. Published 21 April 2013; Corrected 27 Nov 2015; Doi: 10.1038/NGEO1797; http://www.nature.com/ngeo/journal/v6/n5/full/ngeo1797.html

Link:
http://www.pastglobalchanges.org/products/journal-articles/1131-continental-scale-temperature-variability-during-the-past-two-millennia

Description:
First 2000-year temperature reconstructions for individual continents published. An international team of 78 researchers has published the most comprehensive reconstruction of past temperature changes at the continental scale. The research confirms an overall cooling trend across nearly all continents during the last one to two thousand years. This trend was reversed by distinct warming, beginning in some regions at the end of the 19th century.

Category: Press Releases