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We report chemical abundances obtained by SDSS-III/APOGEE for giant stars infive globular clusters located within 2.2 kpc of the Galactic centre. We detectthe presence of multiple stellar populations in four of those clusters (NGC6553, NGC 6528, Terzan 5, and Palomar 6) and find strong evidence for theirpresence in NGC 6522. All clusters present a significant spread in theabundances of N, C, Na, and Al, with the usual correlations andanti-correlations between various abundances seen in other globular clusters.Our results provide important quantitative constraints on theoretical modelsfor self-enrichment of globular clusters, by testing their predictions for thedependence of yields of elements such as Na, N, C, and Al on metallicity. Theyalso confirm that, under the assumption that field N-rich stars originate fromglobular cluster destruction, they can be used as tracers of their parentalsystems in the high- metallicity regime.

APOGEE Chemical Abundances of Globular Cluster Giants in the Inner Galaxy