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The Open Cluster Chemical Abundances and Mapping (OCCAM) survey aims toconstrain key Galactic dynamical and chemical evolution parameters by theconstruction of a large, comprehensive, uniform, infrared-based spectroscopicdata set of hundreds of open clusters. This fourth contribution from the OCCAMsurvey presents analysis using SDSS/APOGEE DR16 of a sample of 128 openclusters, 71 of which we designate to be "high quality" based on the appearanceof their color-magnitude diagram. We find the APOGEE DR16 derived [Fe/H]abundances to be in good agreement with previous high resolution spectroscopicopen cluster abundance studies. Using the high quality sample, we measureGalactic abundance gradients in 16 elements, and find evolution of some of the[X/Fe] gradients as a function of age. We find an overall Galactic [Fe/H] vsR_GC gradient of $-0.068 \pm 0.001$ dex kpc$^{-1}$ over the range of $6 <$ R_GC$< 13.9$ kpc; however, we note that this result is sensitive to the distancecatalog used, varying as much as 15%. We formally derive the location a breakin the [Fe/H] abundance gradient as a free parameter in the gradient fit forthe first time. We also measure significant Galactic gradients in O, Mg, S, Ca,Mn, Cr, Cu, Na, Al, and K, some of which are measured for the first time. Ourlarge sample allows us to explore four well-populated age bins to explore thetime evolution of gradients for a large number of elements and comment onpossible implications for Galactic chemical evolution and radial migration.

The Open Cluster Chemical Abundances and Mapping Survey: IV. Abundances for 128 Open Clusters using SDSS/APOGEE DR16