Effect of the North Atlantic Oscillation on stable isotopes of precipitation in Northern Europe

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  • 北ヨーロッパにおける降水の安定同位体比に与える北大西洋振動の影響

Abstract

<p>From the Global Network of Isotopes in Precipitation (GNIP) dataset, Reykjavik and Espoo in the Northern Europe, where there is a negative and a positive correlation between the North Atlantic Oscillation (NAO) index and stable isotopes in precipitation, respectively, were extracted and revealed the differences in the fluctuation factors between them. The influence of temperature effect on the total variation of δ18O in precipitation was less than 30% in Reykjavik, while it was more than 85% in Espoo. And composite analysis on the distribution of δ18O in precipitation and atmospheric circulation fields were conducted using the long-term data of an isotope-incorporated atmospheric general circulation model. Furthermore, the difference of moisture flux was analyzed separately high NAO years and low NAO years. As a result, the δ18O in precipitation is low (high) due to moisture flux which has higher (lower) stable isotopes from west (south) in high (low) NAO years in Reykjavik. While, the δ18O in precipitation is high (low) due to the strong (weak) westerly wind nearby 50°–60°N, and the moisture flux from the Atlantic Ocean which has higher stable isotopes is a large (small) amount in high (low) NAO years in Espoo.</p>

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