Navigation Links
Ice sheet collapse and sea-level rise at the Boelling warming 14,600 years ago

International scientists have shown that a dramatic sea-level rise occurred at the onset of the first warm period of the last deglaciation, known as the Blling warming, approximately 14,600 years ago. This event, referred to as Melt-Water Pulse 1A (MWP-1A), corresponds to a rapid collapse of massive ice sheets 14,600 years ago and resulted in global sea-level rise of ~14 m. These findings are published in the 29 March 2012 issue of the journal Nature (Volume 483, Issue 7391).

Collaboration between CEREGE (UMR Aix-Marseille Univ. - CNRS - IRD - College de France) and the Universities of Oxford and Tokyo, allowed an international science team to publish on research stemming from the Tahiti Sea-Level Expedition 310 of the Integrated Ocean Drilling Program (IODP). The Tahiti Sea-Level Expedition was carried out in 2005 by the European Consortium for Ocean Research Drilling (ECORD) and the ECORD Science Operator (ESO) on behalf of IODP.

Using U-Th dating of coral samples obtained from cores drilled in the Tahiti coral reefs, the researchers were able to reconstruct sea-level rise over the last deglaciation. Coral is extremely sensitive to sea-level changes and fossilized corals are therefore an excellent indicator for sea-level changes over time.

"Corals are outstanding archives to reconstruct past sea-level changes as they can be dated to within plus or minus 30 years stretching back thousands of years. Moreover, Tahitian reefs are ideally located to reconstruct the deglacial sea-level rise and to constrain short-term events that are thought to have punctuated the period between the Last Glacial Maximum and the present days. Tahiti is located at a sufficiently considerable distance from the major former ice sheets to give us close to the average of sea levels across the globe, as a non-volcanic island it is also subsiding into the ocean at a steady pace that we can easily adjust for." Pierre Deschamps, first author based at CEREGE said.

The Nature article presents the view that most of the melting water that contributed to MWP-1A was sourced from the Antarctic ice sheet, highlighting dynamical behaviour of this ice sheet in the past. The authors note that further research is needed using cored fossilized corals to better understand the sequence of events related to ice sheet collapse during the last deglaciation.

Today, half of world's population, approximately 3.2 billion people, lives within 200 km of coastline, and a tenth of the population lives less than 10 meters above sea level. Tahiti itself is, of course, at risk from modern sea-level rise. The government of Tahiti cooperated on the IODP Expedition 310 by providing the necessary regulatory clearances to drill on the fossilized coral reefs.

Pierre Deschamps says "Insights into past sea-level changes may help to better constrain future changes. Our work sheds light onto an extreme event of rise in global sea levels in which ice-sheet collapse coincided with a rapid warming. Whether the freshwater pulse was a result of an already warming word or helped to warm the climate is currently unclear. However, our finding will help scientists currently modelling future climate change scenarios to factor in the dynamic behaviour of major ice sheets and finally to provide more reliable predictions of ice sheet responses to a warming climate".

Much is yet unknown about the dynamics of sea-level change, in response to massive water discharge. However, IODP Expedition 310 has helped international scientists shed light on one of the most important climate event of the last deglaciation, the MWP-1A event, based on fossil corals obtained from off the coast of Tahiti.


Contact: Miyuki Otomo
Integrated Ocean Drilling Program Management International

Related biology news :

1. Extreme melting on Greenland ice sheet, reports CCNY team
2. NYU Langone Medical Centers tip sheet to the 2011 Alzheimers Association International Conference
3. Tipsheet for the May issue of the American Naturalist
4. Tip sheet: Caltech researchers presenting at AAAS
5. Fabric softener sheets repel gnats
6. Pacific Northwest National Laboratorys 2010 AGU tip sheet
7. ActiveCare, Inc. Announces Capital Raise Commitment and Balance Sheet Restructuring
8. The secret of life may be as simple as what happens between the sheets -- mica sheets
9. Tip sheet for journalists: Equol, soy, menopause and bone health research published in Journal of Nutrition
10. Energy-harvesting rubber sheets could power pacemakers, mobile phones
11. Annals of Internal Medicine tip sheet for Jan. 19, 2010, issue
Post Your Comments:
(Date:10/27/2015)... Munich, Germany , ... (ASGM) automatically maps data from mobile eye tracking videos ... so that they can be quantitatively analyzed with SMI,s ... Germany , October 28-29, 2015. SMI,s Automated Semantic ... eye tracking videos created with SMI,s Eye Tracking ...
(Date:10/26/2015)... and LAS VEGAS , Oct. 26, ... , an innovator in modern authentication and a founding ... the launch of its latest version of the Nok ... organizations to use standards-based authentication that supports existing and ... Authentication Suite is ideal for organizations deploying customer-facing applications ...
(Date:10/23/2015)... California , October 23, 2015 ... (SMI) announce a mobile plug and play integration of ... real-world tasks SensoMotoric Instruments (SMI) present ... wearable solutions for eye tracking and physiological data registration. ... SMI Eye Tracking Glasses 2w and physiological ...
Breaking Biology News(10 mins):
(Date:11/24/2015)... IN (PRWEB) , ... November 24, 2015 , ... The ... newest Special Interest Group (SIG), MultiGP, also known as Multirotor Grand Prix, to represent ... the last few years. Many AMA members have embraced this type of racing and ...
(Date:11/24/2015)... TEL AVIV, Israel , Nov. 24, 2015  Tikcro Technologies Ltd. ... be held on December 29, 2015 at 11:00 a.m. Israel ... & Co., Electra Tower, 98 Yigal Allon Street, 36 th Floor, ... , election of Eric Paneth and Izhak Tamir ... and Rami Skaliter as external directors; , approval of an ...
(Date:11/24/2015)... Urdorf, Switzerland (PRWEB) , ... November 24, 2015 ... ... the plant and the environment are paramount. Insertion points for in-line sensors can ... TOLEDO has developed the InTrac 781/784 series of retractable sensor housings , ...
(Date:11/24/2015)... 24, 2015 /CNW Telbec/ - ProMetic Life Sciences Inc. (TSX: ... Mr. Pierre Laurin , President and Chief Executive Officer ... upcoming Piper Jaffray 27 th Annual Healthcare Conference to ... 1-2, 2015. st , at 8.50am (ET) ... throughout the day. The presentation will be available live via ...
Breaking Biology Technology: