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The major disadvantage is that if the predetermined age markers are incorrect than the age assigned to the ice-core will also be incorrect.In this method one compares certain inclusions in a ice-core whose age has been determined with a seperate method to similar inclusions in an ice-core of a still undetermined age. Of the irradiation dependent markers the two most important are 10Be and 36Cl. The major disadvantage of this dating method is that isotopes tend to diffuse as time proceeds.In this method one compares certain inclusions in dated ocean cores with related inclusions found in the ice-core of a still undetermined age. Hyde has posted separately some of the relationships between ocean core data and their astronomical causes.Examples of such inclusions are a decrease (or increase) in temperature over a period of years that can be determined from flora and fauna found in the oceanic core and a decrease (increase) in the 18O enrichment over this same period of years. These are the primary "inclusions" that are compared.It should be noted that the 10Be/9Be ratios for some ice cores have been compared with the known solar cycle and are in excellent agreement with what is known (accurately showing the time of the European Little Ice Age, which corresponded with a remarkably low amount of solar activity).The major disadvantage of this dating method is that these isotopes also tend to diffuse over time.
The major disadvantage of this method is that one must have a previously age-dated ice core to start with.
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.
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. Once such markers of seasonal variations are found, they can be used to find the number of years that the ice-core accumulated over.