3. Methods
Intermediate and deep water [Cr] and δ53Cr samples
were collected on RV Investigator expeditions IN2018_V02
(Mar-2018) and IN2018_V04 (Sept-Oct 2018), ACE Legs 1 (Dec-2016 to
Jan-2017) and 2 (Jan-2017 to Feb-2017), GEOTRACES section GP13
(Australian leg, May-June 2011), RV Meteor cruise M77/4 (Jan-Feb
2009), Line P cruise 2012-13 (Aug-2012), and RV Discovery cruise
DY110 (Oct-Nov 2019) (Figure 1). Further analyses were performed on
bottom and pore waters (IN2018V_04) and on samples from shipboard
regeneration incubation experiments (IN2018V_02).