Decoding Past Climates through Dripstones

December 16, 2023

They store a wealth of information on past climate which helps us to better understand the environment in which early humans lived”, Jenny Maccali explains. She is a scientist at SapienCE Centre of Excellence, and has has lead the study, now published in Climate of the Past. “All these factors mean that climate in the past could have been different from today and also possibly highly variable”, Jenny Maccali says. Maccali and her team of researchers have focused on the subterranean world of caves, where they explore dripstones, also known as speleothems, to study past climate. “Dripstones forming in caves are excellent archives for climate reconstructions, because their age can be accurately determined and a suite of methods can be used to reconstruct different aspects of past climate”, Maccali says.

“Dripstones, or speleothems, are unique natural archives - like Earth’s USB sticks. They store a wealth of information on past climate which helps us to better understand the environment in which early humans lived”, Jenny Maccali explains. She is a scientist at SapienCE Centre of Excellence, and has has lead the study, now published in Climate of the Past.

New perspective to ancient climate

South Africa has a highly dynamic climate resulting from its position at the convergence of two oceanic basins, the Atlantic Ocean to the west and the Indian Ocean to the east. The region is also located at the boundary of different climate zones (subtropical vs. temperate), and the proximity of the Antarctic ice sheet has a direct impact on its climate by influencing the easterlies and westerlies winds position, and hence rainfall pattern.

“All these factors mean that climate in the past could have been different from today and also possibly highly variable”, Jenny Maccali says.

She says that it is particularly important given that the region hosts key archaeological sites with records of significant cognitive, technological, and social developments and it is important to understand the climatic conditions under which these occurred.

Archives for climate reconstruction

A recent study, Multi-proxy speleothem-based reconstruction of mid-MIS 3 climate in South Africa,  undertaken by a team of scientists from SapienCE, used new techniques to reconstruct past climate and its variability.

Maccali and her team of researchers have focused on the subterranean world of caves, where they explore dripstones, also known as speleothems, to study past climate. The study is based on scientific analyses of speleothems from Bloukrantz Cave.

“Dripstones forming in caves are excellent archives for climate reconstructions, because their age can be accurately determined and a suite of methods can be used to reconstruct different aspects of past climate”, Maccali says.

Insights to early human occupations

One of the dripstones from Bloukrantz cave, located on the southern coast of South Africa, provided the team with new climate data for a time window of 3000 years during the last glacial period – from around 45,000 years ago. They used different methods that confirmed the average air temperature for this period of 18.8 ± 0.5 ◦C, which was slightly warmer compared to the present day, possibly because the sea level was lower, and the site was further away from the coastline than today. In addition, we could show, again based on multiple methods, that rainfall was highly variable with repeated drying events.

“Combining these insights, our study was able to increase confidence in the methods that were being used and further work will likely provide a detailed picture of the climate around the early human occupations during a crucial time period in South Africa”, Maccali says.

The source of this news is from University of Bergen

Popular in Research

1

Feb 12, 2024

DTU Scientist Co-Authors International Paper on COVID-19

2

Feb 19, 2024

Two Simple Words May Help Decide Immigration Case Before the High Court

3

4 days ago

AI agents help explain other AI systems

4

Feb 13, 2024

AI innovation helps create authentic, pitch perfect vocals

5

Feb 10, 2024

Engineers to develop robot maintenance crews in space

Biden defends strikes on Houthis, vows to respond again

19 hours ago

IDF wipes out Hezbollah commander on embattled Lebanon streets in dramatic footage

19 hours ago

Donald Trump advertises on MSNBC in New Hampshire to slow Haley

4 hours from now

Japan's Nikkei crosses 39,000 as robust earnings, investor-friendly measures drive risk-on sentiment

5 days ago

NYU Gallatin Galleries Presents ‘In Loving Memory,’ an exhibition of work by Khidr Joseph Feb. 1—29, 2024

1 day ago

NYU Wagner Labor Initiative Explores Role of State and Local Government in Workers’ Rights

1 day ago