Researchers have analyzing ice cores drilled inside the Greenland ice sheet. The researchers have started to calculate the amount of Arctic sea ice there was in the past. The researchers from Denmark, Italy, Spain, and Japan published their results in the journal, Scientific Reports. The Greenland ice sheet records information about Arctic temperatures and climate that dates back to more than 120,000 years ago. Some new research reveals that the ice can tell us what is happening not just in the air and on land but also in the sea. The Arctic sea ice is changing, in the past the Arctic ocean was covered in meters of thick sea ice that is being replaced with thin ice that melts over summer. With the decrease in ice the ecosystems and cultures are being threatened. The researchers from Denmark and Italy have discovered that chemical traces of sea ice can be found far away from the ocean with kilometers of thick Greenland ice sheets. The chemical traces are Bromine which can be found in the ocean and in the sea ice.When new sea ice forms, salty ice pockets get created that have brine which contains bromine.
The researchers can measure the amount of the bromine in the Greenland ice cores. In order for there to be a connection between the the bromine and the and the amount of sea ice coverage in the Arctic, scientist used satellite observations of the sea as measuring sticks, which go back to the 1970's. Records from Icelandic fishing communities that go back more than 1000 years, that show the amount of sea ice.
https://www.sciencedaily.com/releases/2016/09/160928083222.htm
The researchers can measure the amount of the bromine in the Greenland ice cores. In order for there to be a connection between the the bromine and the and the amount of sea ice coverage in the Arctic, scientist used satellite observations of the sea as measuring sticks, which go back to the 1970's. Records from Icelandic fishing communities that go back more than 1000 years, that show the amount of sea ice.
https://www.sciencedaily.com/releases/2016/09/160928083222.htm