Figure 1 : Amount of dissolved oxygen and changes per decade since 1960.

From: Decline in global oceanic oxygen content during the past five decades

Figure 1

a, Global oxygen inventory (dissolved oxygen, colour coded). Lines indicate boundaries of oxygen-minimum zones (OMZs): dashed-dotted, regions with less than 80 μmol kg−1 oxygen anywhere within the water column; dashed lines and solid lines similarly represent regions with less than 40 μmol kg−1 oxygen and 20 μmol kg−1 oxygen, respectively. b, Change in dissolved oxygen per decade (colour coded). Lines show OMZs as in a.