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Lewis Glacier Ice Core Readme
Note: The file, lewis.dat has been split into three files. They are tab delimited text files to facilitate easier usage. Each one contains the information described in the first 5 columns of Record 1 below. The three new files from the original file are now named, lewisa.txt, lewisb.txt, and lewisc.txt, each with particle sizes corresponding respectively to record 1, record 2, and record 3 below.
Byrd Polar Research Center Ice Core Files: Microparticle Analyses
Documentation transcribed at WDC/NSIDC, November 1990
List of files:
4. LEWIS.DAT - Mt. Kenya: The Lewis Glacier.
Two pits were excavated to 2.6 and 2.3 meters and a SIPRE coring device was used to drill cores in the bottom of each pit. The coring site is on the col between the Lewis and Gregory glaciers at an elevation of 4875 meters. The total number of samples in this file is 176.
Site 1: Core was obtained to a depth of 13.4 meters but during the coring a void 3.5 meters deep was encountered. Total samples for Site 1 is 111.
Site 2: Samples were obtained to a depth of 11.4 meters. No void was encountered. The total samples for Site 2 is 65.
Reference:
Thompson, L.G. (1979) Ice core studies from Mt.Kenya, Africa and their relationship to other tropical ice cores studies. In: Sea Level, Ice and Climatic Change. IAHS Publication no. 131, p. 55- 62.
FILE FORMAT:
Record 1:
Columns Format Description
------- ------ -----------
(01-06) I6 Date of sample analysis
(07-10) I4 Section number
(11-13) I3 Sample number
(14-21) F8.3 Depth at the top of the sample (in meters)
(22-26) F5.2 Size of the sample processed (in cm)
(27-32) I6 Number of particles with diameters between 0.5-0.62 micrometers
(33-38) I6 Number of particles with diameters between 0.63-0.79 micrometers
(39-44) I6 Number of particles with diameters between 0.80-0.99 micrometers
(45-50) I6 Number of particles with diameters between 1.0-1.24 micrometers
(51-56) I6 Number of particles with diameters between 1.25-1.59 micrometers
(57-62) I6 Number of particles with diameters between 1.6-1.99 micrometers
(63-68) I6 Number of particles with diameters between 2.0-2.51 micrometers
Record 2:
Columns Format Description
------- ------ -----------
(01-06) I6 Number of particles with diameters between 2.52-3.16 micrometers
(07-12) I6 Number of particles with diameters between 3.17-3.99 micrometers
(13-18) I6 Number of particles with diameters between 4.0-4.99 micrometers
(19-24) I6 Number of particles with diameters between 5.0-6.34 micrometers
(25-30) I6 Number of particles with diameters between 6.35-7.99 micrometers
(31-36) I6 Number of particles with diameters between 8.0-9.99 micrometers
(37-42) I6 Number of particles with diameters between 10.0- 12.69 micrometers
(43-48) I6 Number of particles with diameters between 12.7-16.0 micrometers
(49-54) I6 Number of particles with diameters 0.5 micrometers or larger
(55-60) I6 Number of particles with diameters 0.63 micrometers or larger
(61-66) I6 Number of particles with diameters 0.80 micrometers or larger
(67-72) I6 Number of particles with diameters 1.0 micrometers or larger
Record 3:
Columns Format Description
------- ------ -----------
(01-06) I6 Number of particles with diameters 1.25 micrometers or larger
(07-12) I6 Number of particles with diameters 1.6 micrometers or larger
(13-18) I6 Number of particles with diameters 2.0 micrometers or larger
(19-24) I6 Number of particles with diameters 2.52 micrometers or larger
(25-30) I6 Number of particles with diameters 3.17 micrometers or larger
(31-36) I6 Number of particles with diameters 4.0 micrometers or larger
(37-42) I6 Number of particles with diameters 5.0 micrometers or larger
(43-48) I6 Number of particles with diameters 6.35 micrometers or larger
(49-54) I6 Number of particles with diameters 8.0 micrometers or larger
(55-60) I6 Number of particles with diameters 10.0 micrometers or larger
(61-66) I6 Number of particles with diameters 12.7 micrometers or larger
(67-71) F5.1 Coarseness factor which equals the number of particles with diameters 1.0 micrometers or larger, divided by the total number with diameters 0.5 micrometers or larger.
(72) I1 This factor has three possible values which indicate the volume of sample analyzed by the Coulter procedure.
(a) if factor = 0 a 500 microliter sample was processed,
(b) if factor = 1 the sample is missing,
(c) if factor = 2 a 50 microliter sample was processed.
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