Something wrong with the ice cores?

The question arises after studying this site – CO2 has only risen by
5.2% in the last 200 years.:-

http://www.biokurs.de/treibhaus/180C...bayreuth1e.htm

Ice core samples show a nice steady line like they have been smoothed.
Here is a paper dealing with the subject:-

http://cdiac.ornl.gov/trends/co2/lawdome.html

The problem I have with this, is that Antarctica is a desert. It has
an average annual precipitation (snowfall is recalculated at its
“water equivalent”) is only about 2 inches per year. Snow gets blown
around in high winds giving the impression of snow fall. Cold air
cannot hold much water. If you wanted a device to rid the ice of CO2
Antarctica could be a good place to start a study.

Nelson