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Basic Data Analysis for Time Series with R by DeWayne Derryberry

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20 VOSTOK ICE CORE DATA

20.1 SOURCE OF THE DATA

The Vostok ice core data is stored at the National Oceanic and Atmospheric Administration at these locations:

  • ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/vostok/deutnat.txt
  • ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/vostok/co2nat.txt. ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/vostok/dustnat.txt

The original source (updated 11/2001) for this data is due to Petit et al. (1999).

The first file listed above contains a second column that is the estimated age of the reading and the last (fourth) column that is the temperature as deviations from a baseline level. The units for temperature are Celsius. A header in the original file explains each column in a lot more detail. Some of the first few rows of data in the file are presented in Table 20.1.

TABLE 20.1 Temperature Data (“Vostok temps.txt” in the Vostok Folder)

Depth_corrected Ice_age(GT4) deut deltaTS
  0 0 −438 0.00
  1 17 −438 0.00
  2 35 −438 0.00
10 190 −435.8 0.36
11 211 −443.7 −0.95
12 234 −449.1 −1.84
13 258 −444.6 −1.09
14 281 −442.5 −0.75, etc.

This data is in the Vostok folder from the data disk and is denoted “Vostok temps.txt.” Obviously, the file must be brought into R using read.table() (with header = T), not scan().

The second files from NOAA contains the ice core CO2 measurements in ppmv (parts per million by volume). There are only two columns, the first is the estimated age and the ...

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