Scientists calculate Earth’s Ice Age temperature by studying glacial cooling: Research

Scientists, in a recent study, ‘revisited’ climate sensitivity and glacial cooling to calculate how cold it got on Earth during depths of last Ice , when ice sheets covered large parts of rth America, South America, Europe and Asia. research published in journal Nature ted that aver global temperature during period kwn as Last Glacial Maximum (LGM) from roughly 23,000 to 19,000 years ago was about 7.8 degrees Celsius, some 7 Celsius colder than 2019. 

Jessica Tierney, who is University of Arizona paleoclimatologist and le author of research, said, “Past climates are only information we have about what really happens when Earth cools or warms to a large degree. So by studying m, we can better constrain what to expect in future”. 

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As per study, researchers ted that certain region was much cooler than global aver. y found that polar regions cooled far more than tropics, with Arctic region 14-degree celsius colder than global aver.

researchers me calculations with help of chemical measurements on tiny fossils of zooplankton. y even used preserved structures of fats from or s of plankton that change in response to water temperature, what scientists called a ‘temperature proxy’, to come to  conclusion. 

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Human hunting contributed to extinction 

As per study, research team used information, along with climate change model simulations, to calculate aver global temperatures. y ted that during Ice , which lasted from about 115,000 to 11,000 years ago, large mammals well apted to a cold climate such as mammoths, mastodons, woolly rhis and sabre-tood cats rammed landscape. 

y furr said that humans entered rth America for first time during Ice , crossing land bridge that once connected Siberia to Alaska with sea levels much lower than y are today. Moreover, y ded that human hunting is believed to have contributed to mass extinctions globally of many species at end of Ice . 

Tierney said, “What is interesting is that Alaska was t entirely covered with ice. re was an ice-free corridor that allowed humans to travel across Bering Strait, into Alaska. Central Alaska was actually t that much colder than today, so for Ice humans it might have been a relatively nice place to settle”. 

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