Table 2 Mean and dispersion of δ18O and δ13C values of surface sea water samples collected from various biogeochemical zones in 2011, 2012 and 2013.
Zones | Year | δ18O ‰ relative to VSMOW | δ13C ‰ relative to VPDB |
|---|---|---|---|
Tropical Indian Ocean (TIO) | 2011 | 0.2 ± 0.16 (n = 35) | NA |
2012 | 0.31 ± 0.34 (n = 8) | 0.78 ± 0.06 (n = 7) | |
2013 | 0.00 ± 0.3 (n = 4) | 0.66 ± 0.14(n = 7) | |
Subtropical zone (STZ) | 2011 | 0.44 ± 0.07 (n = 3) | NA |
2012 | 0.66 (n = 1) | 0.83 ± 0.09(n = 4) | |
2013 | 0.45 ± 0.12 (n = 4) | 0.91 ± 0.28(n = 4) | |
Transition zone (TZ) | 2011 | 0.55 ± 0.10 (n = 4) | NA |
2012 | 0.74 (n = 1) | 1.07 ± 0.13(n = 2) | |
2013 | −0.06 ± 0.81 (n = 3) | 0.81(n = 1) | |
Sub-Antarctic zone (SAFZ) | 2011 | 0.09 ± 0.60 (n = 8) | NA |
2012 | 0.24 ± 0.41 (n = 5) | 1.01 ± 0.16(n = 5) | |
2013 | −0.21 ± 0.27 (n = 4) | 1.54 ± 0.28(n = 4) | |
Polar frontal zone (PFZ) | 2011 | −0.46 ± 0.06 (n = 5) | NA |
2012 | −0.57 ± 0.16 (n = 2) | 1.48 ± 0.12(n = 3) | |
2013 | −0.35 ± 0.19 (n = 4) | 1.53 ± 0.09(n = 4) | |
Antarctic zone (AAZ) | 2011 | −0.58 ± 0.07 (n = 17) | NA |
2012 | −0.89 (n = 1) | 1.4(n = 1) | |
2013 | −0.47 ± 0.18 (n = 12) | 1.28 ± 0.11(n = 5) |
