Figure 4: Chromium and macronutrient concentrations and AOU
along intermediate and deep water circulation.
Modification of deep water [Cr] is shown, along with parameters
associated with the regeneration of organic material
([PO4], AOU) and dissolution of plankton
skeletal/frustule phases ([Si(OH)4]). Panels on the
left show AAIW (circles – Southern and Pacific Ocean data, diamonds –
Atlantic Ocean data) while panels on the right show Southern and Pacific
Ocean UCDW, PDW and LCDW, with UCDW and PDW in circles and LCDW in
squares. Open circles denote samples with Antarctic Surface Water or
Winter Water contributions. Colors match sampling locations shown in
Figures 1 and S2, and full data and sources are shown in Tables S8-S10.
Direct comparisons between [Cr] and AOU, PO4 and
Si(OH)4 are shown in Figure 5. Note the different x axis
ranges for left and right panels.