Southern Ocean Carbon Synthesis

Mario Hoppema, Marta Alvarez, Dorothee Bakker, Steven van Heuven, Masao Ishii, Bob Key, Nicolas Metzl, Claire Lo Monaco, Aida Rios, Chris Sabine, Bronte Tilbrook, Anton Velo

Southern Ocean here defined as region south of 30°S

3 sub-regions:

Atlantic : 70°W – 30°E

Indian : 30°E – 120°E

Pacific : 120°E – 70°W

In the Pacific sector strong cooperation with the Pacific Synthesis PICES group.

Partly same members (Chris Sabine, Bronte Tilbrook, Masao Ishii, Bob Key)

Until now:

22 new cruises in the Southern Ocean

About 10 more cruises to follow

Also:

46 cruises from GLODAP as “master cruises”

However, the uncorrected/not adjusted cruise data are used.

Southern Ocean:

Region with least data

Few repeat sections

231 Cross-over points, including those with “GLODAP” cruises(but more in the near future)

Summary of offsets for the SO Atl-SectorSO N-xovers Done mean std

Total Xovers 231salinity 111 57 -0.0003 0.0052tco2 59 55 2.0 8.1alkalinity 42 20 -1.0 8.7pH 3 3nitrate 99 55 1.01 0.03phosphate 76 49 0.99 0.05silicate 101 49 1.01 0.07oxygen 109 58 1.00 0.03cfc12 32 25 0.712 8.732cfc11 37 26 1.790 1.424cfc113 1 1 2.222ccl4 2 2 1.229 0.285

-20

-15

-10

-5

0

5

10

15

20

0 5 10 15 20 25

AT

Diff

(µm

ol/k

gsw

)Original DiffAlkalinity

-20

-15

-10

-5

0

5

10

15

20

0 5 10 15 20 25

AT

Diff

(µm

ol/k

gsw

)

Original DiffDiff(i,j)+O(i)+O(j)

Preliminary adjustments after applying inversion method