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We calculate the stellar mass-metallicity relation at five epochs ranging toz~2.3. We quantify evolution in the shape of the mass-metallicity relation as afunction of redshift; the mass-metallicity relation flattens at late times.There is an empirical upper limit to the gas-phase oxygen abundance instar-forming galaxies that is independent of redshift. From examination of themass-metallicity relation and its observed scatter we show that the flatteningat late times is a consequence of evolution in the stellar mass where galaxiesenrich to this empirical upper metallicity limit; there is also evolution inthe fraction of galaxies at a fixed stellar mass that enrich to this limit. Thestellar mass where metallicities begin to saturate is ~0.7 dex smaller in thelocal universe than it is at z~0.8.

The Chemical Evolution of Star-Forming Galaxies Over the Last 11 Billion Years