Fig. 2
Meridional distributions in the surface mixed layer of a DOC (μmol kg−1), b a254 (m−1), c a325 (m−1), d FDOM-C1 (RU), e FDOM-C2 (RU), f FDOM-C3 (RU), g S275–295 (nm−1), h a254/365, i BIX, and j HIX. All data from the surface mixed layer are shown. Large variations in some variables at individual stations are due to (1) relatively close distance between stations (instances in INDW and APLR) or (2) relatively low vertical sampling resolution (10, 50, 100, 150, 200, and 250 m as well as Chl a maximum depth), resulting in some sampling depths being positioned near the bottom of the surface mixed layer and a Chl a maximum depth potentially being included in the layer. Vertical lines show each boundary between the biogeochemical provinces