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.