Oceanographic measurements in Icy Bay, Alaska, reveal that warm ocean water can control rates of iceberg calving at Yahtse Glacier.  We find that water >10 degrees C can reach within 1.5 km of the glacier terminus, essentially unaltered from that found in the open Gulf of Alaska.  In the late summer and fall, when vigorous subglacial discharge flows into warm ocean water, submarine melting can undercut the glacier terminus at more than half the rate at which ice flows into the terminus.  Thus, submarine melt can control iceberg calving, without regard to the internal stress field within the glacier terminus.

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