Below the firn is a zone in which seasonal layers alternately have open and closed porosity. Gas ages increase rapidly with depth in these layers.Various gases are fractionated while bubbles are trapped where firn is converted to ice.In many locations in Antarctica the air temperature is always well below the freezing point of water.
These include (proxies for) temperature, ocean volume, precipitation, chemistry and gas composition of the lower atmosphere, volcanic eruptions, solar variability, sea-surface productivity, desert extent and forest fires.
The length of the record depends on the depth of the ice core and varies from a few years up to 800 kyr (800,000 years) for the EPICA core. the shortest time period which can be accurately distinguished) depends on the amount of annual snowfall, and reduces with depth as the ice compacts under the weight of layers accumulating on top of it.
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I love almost everything that belongs to women as the insides(friendliness, honesty..) as the outsides (cosmetics,clothes,footwear ,fetishes plus a lot more. An ice core from the right site can be used to reconstruct an uninterrupted and detailed climate record extending over hundreds of thousands of years, providing information on a wide variety of aspects of climate at each point in time.It is the simultaneity of these properties recorded in the ice that makes ice cores such a powerful tool in paleoclimate research. Because an ice sheet survives summer, the temperature in that location usually does not warm much above freezing.Air gaps remain, and some circulation of air continues.As snow accumulates above, the firn continues to densify, and at some point the pores close off and the air is trapped.Inclusions in the snow of each year remain in the ice, such as wind-blown dust, ash, pollen, bubbles of atmospheric gas and radioactive substances.