Heinrich events

Heinrich events are episodes in Earth's climate history when massive armadas of icebergs broke off from ice sheets and drifted into the North Atlantic, depositing layers of rock debris as they melted.

Named for geologist Hartmut Heinrich, who identified them in seafloor sediments, these events occurred roughly every 7,000–10,000 years during glacial periods and triggered abrupt cooling across the Northern Hemisphere by disrupting ocean circulation patterns.