Sources of δ18O Concentration Variability in Greenland Ice Cores: Temperature, North Atlantic Oscillation and Solar Activity

摘要

This work concerns possible connection between variations of δ18O in Greenland ice, temperature, precipitation amount, NAO indices and relative sunspot numbers. The relationships between 10-year averaged values of this data were derived making use of regression analysis methods. It was discovered that February temperature yields the main contribution in variability of δ18O. The multiple correlation coefficient between weighted night temperature of the most important months and δ18O equals 0.95±0.01. Besides the local source of δ18O changes, defined by the amount of precipitation and temperature, an additional source correlated with the level of solar activity has been revealed. The relative contribution of this source in the δ18O variance is about 0.1. It has been shown that the multiple correlation coefficient between δ18O and NAO indices is equal to 0.85. Therefore the NAO yields more than 2/3 of the variances of climatic change in Greenland. An independent contribution of solar activity in climatic changes is about 1/3.