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About

Gregory C. Johnson is a leading physical oceanographer whose work has fundamentally reshaped our understanding of the global ocean’s role in the climate system. His research centers on ocean observing systems, climate variability, and the ocean’s heat and freshwater budgets. Johnson is best known for his central role in the Argo program, an international array of nearly 4,000 autonomous profiling floats. His landmark paper, "Argo—Two Decades: Global Oceanography, Revolutionized" (125 citations), documents how this network has transformed oceanography by providing continuous, basin-scale measurements of temperature and salinity. He has also been at the forefront of extending this capability into the deep ocean, as shown in "Observing the full ocean volume using Deep Argo floats" (24 citations), which tracks abyssal warming and freshening originating near Antarctica. More recently, his visionary work "Advancing ocean monitoring...to OneArgo by 2030" (13 citations) outlines the urgent need for an expanded, sustained global array to meet societal challenges. Through these contributions, Johnson has enabled unprecedented insights into how the ocean stores excess heat and moderates climate change, making him a pivotal figure in modern oceanography.