Air samples collected at Cape Grim, Australia. (41°S, 144°E)


SIL ID #     Identification Number used at the Stable Isotope Lab, 
              University of Washington.
Date         Date that this sample was collected.
CH4-SIL      Methane concentration (ppm) determined manometrically at SIL with 
              precision of ± 2%, see Quay et al. (1).
CH4-CSIRO    Methane concentration (ppm) determined by gas chromatography by CSIRO,
              see Fraser et al. (2).
Del 13C      Measured 13C/12C in per mil (0/00) units, where
              del 13C(0/00) ={[(13C/12C)sample/(13C/12C)standard - 1]*1000}
              and the standard is VPDB, see Quay et al. (1).
              Del 13C (0/00) corrected for standard drift, see Quay et al. (1).



SIL ID #        Date       CH4-SIL CH4-CSIRO Del 13C
TTNM0002        19-APR-88     1.63            -47.35
TTNM0003        13-SEP-88     1.64    1.647   -47.25
TTNM0004        13-SEP-88     1.64    1.647   -47.08
TTNM0006        18-APR-89     1.63    1.624   -47.10
TTNM0005        18-APR-89     1.65    1.624   -47.19
TTNM0007        24-AUG-89     1.64    1.653   -47.08
TTNM0008        24-AUG-89     1.63    1.653   -47.30
TTNM0009        16-OCT-89     1.64    1.652   -47.28
TTNM0014        6-MAR-90      1.65    1.635   -47.10
TTNM0013        6-MAR-90      1.62    1.635   -47.20
TTNM0015        26-JUN-90     1.62    1.647   -47.19
TTNM0016        7-AUG-90      1.63    1.657   -47.24
TTNM0017        3-OCT-90      1.62    1.662   -47.21
TTNM0019        26-FEB-91     1.59    1.633   -47.03
TTNM0021        15-JUL-91     1.64    1.658   -47.25
TTNM0023        10-JUN-92     1.71            -47.02
TTNM0024        10-JUN-92     1.70            -47.42
TTNM0025        23-SEP-92     1.69            -47.09
TTNM0026        23-SEP-92     1.68            -47.10
TTNM0027        25-NOV-92     1.72            -47.27
TTNM0028        25-NOV-92     1.69            -47.28
TTNM0030        23-FEB-93     1.65    1.651   -47.17
TTNM0029        23-FEB-93     1.68    1.651   -47.11
TTNM0033        8-APR-93      1.66    1.656   -47.22
TTNM0032        8-APR-93      1.68    1.656   -47.23
TTNM0032A       3-MAY-93      1.92    1.661   -47.19
TTNM0031        3-MAY-93      1.72    1.661   -47.15
TTNM0034        22-JUN-93     1.69    1.673   -47.26
TTNM0042        3-AUG-94      1.76    1.684   -47.09
TTNM0047        17-FEB-95     1.69            -47.21
TTNM0046        17-FEB-95     1.73            -47.03
TTNM0050        9-MAR-95      1.71            -47.01
TTNM0048        24-APR-95     1.75            -47.06
TTNM0049        24-APR-95     1.69            -46.90
TTNM0045        16-MAY-95     1.74            -47.00
TTNM0052        21-SEP-95     1.73            -47.24
TTNM0054        24-NOV-95     1.70            -46.88
TTNM0056        22-JAN-96     1.68            -47.19
TTNM0057        29-FEB-96     1.68            -47.02
TTNM0058        29-FEB-96     1.68            -47.11


(1) Quay, P.D., J. Stutsman, D. Wilbur, A. Snover, E. Dlugokenky and T. Brown, (submitted),
Isotopic Composition of Atmospheric Methane, Global Biogeochemical Cycles.

(2)Fraser, P. J., Coram, S., and Derek, N. 1987. Atmospheric methane, carbon monoxide and carbon dioxide
by gas chromatography, 1978-1985. In: Baseline (eds. B. W. Forgan and P. J. Fraser).  Canberra,
Department of Science/CSIRO, Australia, 48-50.