The basis of this method lies with looking for items that vary with the seasons in a consistent manner. References Of the four distinct methods for determining the ages of ice cores, the first three are direct experimental tests and the fourth rests on somewhat uncertain theories.Vi legger stor vekt på kvalitet og kontrollerer derfor alle profiler manuelt. Med brukernavnet ditt kan du være helt anonym når du er logget inn på siden vår.
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As the water vapor travels towards the poles it becomes increasingly poorer in H2(18O) since the heavier molecules tend to precipitate out first.
Thus, water evaporating from the ocean it starts off H2(18O) poor.
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The Earth's magnetic field then traps them, with only a slight "leakage" of the isotopes to the lower atmosphere.
The amount of "leakage" depends on the height of the ionosophere, which changes primarily in response to the Solar cycle, with periods of maximum solar activity corresponding to the highest extent of the ionosphere.
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Both 10Be and 36Cl are formed as charged ions in the ionosphere.
For similar reasons the ratio of deuterium to hydrogen acts the same way.