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When the meltwater reaches a lake the heaiest sediments (sand and silt) sink to the bottom quickly and eventually formed thick layers of light colored rock.Later in the year, by wintertime, the clay has had enough time to settle to the bottom and it forms a thin layer of dark colored rock.

Large outlet glaciers draining the Greenland Ice Sheet significantly influence overall ice sheet mass balance.

Considerable short term (years to decades) retreat and fluctuations in velocity of Jakobshavn Isbræ, western Greenland, illustrate the complex nature by which large outlet glaciers respond to climate change, making predictions of future ice sheet change challenging.

In a year with a long growing season the tree ring for that year will be thick.

If there wasa very long winter then there will be a thinner tree ring.

RADIOACTIVE ISOTOPES ARE UNSTABLE VERSIONS OF NORMAL ELEMENTS.

BECAUSE THEY ARE UNSTABLE THEY GIVE OFF RADIATION TO TRY TO BECOME NORMAL.

To provide a longer-term view (centuries), we investigate the geological record of Jakobshavn Isbræ change.

We use continuous sediment records from lakes that were influenced by the recent advance of Jakobshavn Isbræ, which took place during the Little Ice Age.

In theory, annual layer-counting can provide a varve chronology with single-year resolution for periods ranging from hundreds to more than ten thousand years into the past.

Varve chronology can provide an opportunity to estimate the true duration of both natural and human-induced events, which is necessary for a basic understanding of historical and archaeological questions.

Comments Varve dating