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This is exactly what researchers would expect to see if the warm temperatures of that time had fueled sea ice loss, leading to increased Arctic snowfall and a decline in deuterium in lakes, Thomas said.She acknowledged that it’s possible that a drop in summer rainfall accounted for the changes in deuterium, but says a rise in winter snowfall is the more likely explanation, as scientists have found independent evidence that the region was wetter 6,000 to 4,000 years ago.While more research needs to be done to draw conclusions about ancient precipitation patterns across Greenland, the new results are consistent with the hypothesis that global warming could drive increasing Arctic snowfall — a trend that would slow the shrinkage of the Greenland Ice Sheet and, ultimately, affect the pace at which sea levels rise.“As the Arctic gets warmer, there is a vigorous scientific debate about how stable the Greenland Ice Sheet will be. ” said lead researcher Elizabeth Thomas, Ph D, an assistant professor of geology in the University at Buffalo College of Arts and Sciences who completed much of the study as a postdoctoral fellow at the University of Massachusetts Amherst.(This is because summer rain holds more deuterium than winter snowfall.) In contrast, in years when snow is relatively abundant, aquatic plants start producing waxes with less deuterium.This is what Thomas and her colleagues saw when they extracted a long, cylindrical sediment sample from a lake bottom in western Greenland.
You don't have to do all your exercise or other physical activity at once.Some research shows that physical activity such as regular walking — not just formal exercise programs — may help improve mood.Physical activity and exercise are not the same thing, but both are beneficial to your health.The mud contains ancient leaf waxes, with the oldest at the base of the column and the youngest at the top.By dating and analyzing thin slices of the sample, the team determined that aquatic leaf waxes had low levels of deuterium from 6,000 to 4,000 years ago.
Exercise helps prevent and improve a number of health problems, including high blood pressure, diabetes and arthritis.