site               lat        lon         comment                                                    date          sample             CH4       H2        CO      d13C_CH4    
Arnarnasstrytan    65.8792    -18.2217    nd                                                         2013-07-10    A1 A-B gas syr.    1.04      2.49      0.09    -49.75      
Arnarnasstrytan    65.8792    -18.2217    nd                                                         2013-07-10    A1 C-D gas syr.    1.41      5.19      0.05    -51.19      
Arnarnasstrytan    65.8792    -18.2217    nd                                                         2013-07-12    A1 bottle          1.06      2.90      0.11    -8.02       
Arnarnasstrytan    65.8792    -18.2217    nd                                                         2013-07-11    A2 A-B gas syr.    0.91      0.10      0.02    -38.05      
Arnarnasstrytan    65.8792    -18.2217    nd                                                         2013-07-11    A2 C-D gas syr.    1.12      0.33      0.13    -30.72      
Arnarnasstrytan    65.8792    -18.2217    nd                                                         2013-07-12    A2 bottle          nd        0.92      0.06    -53.05      
Big_Strytan        65.8247    -18.0940    nd                                                         2013-07-13    S1 A-B gas syr.    0.46      1.50      0.06    -51.40      
Big_Strytan        65.8247    -18.0940    nd                                                         2013-07-13    S1 C-D gas syr.    nd        0.98      0.10    nd          
Big_Strytan        65.8247    -18.0940    nd                                                         2013-07-13    S2 A-B gas syr.    0.59      0.68      0.12    -13.60      
Big_Strytan        65.8247    -18.0940    nd                                                         2013-07-13    S2 C-D gas syr.    0.55      0.30      0.08    -52.91      
Hrisey             66.0252    -18.4002    nd                                                         2013-07-14    H1 bottle          0.80      0.67      0.11    nd          
SW-lit             nd         nd          CH4 and H2 concentrations from Kelley et al. 1998          nd            nd                 0.0002    0.0004    0.06    nd          
SW-lit             nd         nd          d13C_CH4 for surface seawater from Sasakawa et al. 2008    nd            nd                 nd        nd        nd      -46.5