Research shows temperature, not snowfall, driving tropical glacier size

Date:

Share post:

Temperature, not snowfall, has been driving the fluctuating size of Peru’s Quelccaya Ice Cap, whose dramatic shrinkage in recent decades has made it a symbol for global climate change, a Dartmouth-led study shows.

Research shows temperature, not snowfall, driving tropical glacier size
A Dartmouth-led team studying Qori Kalis, the largest glacier emerging from Peru’s Quelccaya Ice Cap, found that temperature, not snowfall, has been driving the fluctuating size of Quelccaya, the largest ice mass in the tropics [Credit: Dartmouth College]

The findings support many scientists’ suspicions that tropical glaciers are rapidly shrinking because of a warming climate, and will help scientists to better understand the natural variability of past and modern climate and to refine models that predict tropical glaciers’ response to future climate change.

Dartmouth glacial geomorphologist Meredith Kelly and her lab team used field mapping combined with the beryllium-10 surface exposure dating method and ice cores obtained by Ohio State University paleoclimatologist Lonnie Thompson to examine how the Quelccaya Ice Cap has expanded and retreated over the past millennium. It is the first time that a record of past glacial extents has been compared directly with an annually dated ice core record from the same ice mass.

During the last millennium, a significant cooling event known as the Little Ice Age occurred, but scientists don’t know what caused the cooling or its geographic extent. The Dartmouth-led team determined beryllium-10 ages of moraines – or glacier sediments—that mark the past positions of Qori Kalis, an outlet glacier that has been monitored by Thompson since he first visited Quelccaya in the early 1960s. The Quelccaya Ice Cap, the largest ice mass in the tropics, sits 18,000 feet above sea level in the Peruvian Andes.

The results show that Qori Kalis advanced to its late Holocene maximum position prior to 520 years ago and subsequently retreated with only minor re-advances since that time. The comparison of the moraine record with the ice core record suggests that temperature was the driving force of glacial expansion and retreat, says Justin Stroup, lead author and a PhD candidate in Dartmouth’s Department of Earth Sciences.

“This is an important result since there has been debate about the causes of recent tropical glacial recession – for example, whether it is due to temperature, precipitation, humidity, solar irradiance or other factors,” says Kelly, a co-author of the study. “This result agrees with Professor Thompson’s earlier suggestions that these tropical glaciers are shrinking very rapidly today because of a warming climate.”

Furthermore, the ebbs and flows of other glaciers in tropical South America are similar to the Qori Kalis extents, indicating a regionally consistent pattern of past climate conditions. On a global scale, the results suggest that glaciers were larger than present and depositing moraines in both northern and southern hemispheres at about the same time, indicating that the climate mechanisms which caused the late Holocene cooling likely influenced a globally synchronous pattern of cooling.

The study appears in the journal Geology.

Source: Dartmouth College [February 25, 2014]

ADVERTISEMENT

spot_img

Related articles

Egyptologists differ on Tut tomb ‘hidden chambers’

Egyptian Antiquities Minister Khaled al-Anani said on Sunday new technology is needed to determine whether Tutankhamun's tomb contains...

Pterosaur footprints found near Jaisalmer

A team of foreign and Indian scientists have spotted the footprints of dinosaurs at Thaiat village in Jaisalmer...

First functional fish head joint discovered in deep-sea dragonfishes in museum collections

Scientists with the Smithsonian's National Museum of Natural History and the French Museum national d'Histoire naturelle are the...

Second campaign of excavations completed on Roman wreck carrying tin ingots off the coast of Brittany

"A rare and exceptional site", is how Olivia Hulot, in charge of mission at DRASSM (Department of Underwater...

Japan kills 333 whales in annual Antarctic hunt

A Japanese whaling fleet returned to port Friday after an annual Antarctic hunt that killed more than 300...

15,000 space rocks and counting

The international effort to find, confirm and catalogue the multitude of asteroids that pose a threat to our...

The cyber-centipede: From Linnaeus to big data

Taxonomic descriptions, introduced by Linnaeus in 1735, are designed to allow scientists to tell one species from another....

Cassini sees Titan cooking up smog

A paper published this week using data from NASA's Cassini mission describes in more detail than ever before...