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. Fig, Longitude-time diagrams of (a) surface chlorophyll, (b) zonal wiSnd speed, (c) sea level, 700 (d) barrier layer thickness, and (e) SST averaged in the 2°S-2°N latitudinal band isohaline; the black line is the Southern Oscillation Index (note the reversed scale 702 on the upper axis); the gray area is the region with chlorophyll < 0, the white 701 line is the 34, p.3

. Fig, Left panel: frequency histogram of the zonal surface current (m s -1 ) along the eastern 708 chlorophyll front (hollow bars) and the west chlorophyll transition zone (filled bars) between 709

. Fig, Time-series of the (a) surface chlorophyll averaged in the 140°E-145°E, 2°S-2°N region; 729 (b) zonal surface current averaged in the 150°E-165°E, 2°S-2°N region; (c) longitudes of the west 730 chlorophyll transition zone (WCTZ) Thick horizontal lines indicate periods of time when (a), p.731

. Fig, Time-series of the (a) width of the oligotrophic zone (thick line) and of the SOI (thin line), 735 (b) fraction of pixels with chlorophyll less than 0.07 mg m -3 in the oligotrophic zone (F oligo ), p.736