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Mid to Late 1700's, Benjamin franklin
He was interested in the Gulf Stream, a fast-moving current of warm surface water that sweeps up from Florida, along the continental slope off the US East Coast, and then bends eastward across the North Atlantic all the way to Europe. -discovering the gulf stream- -
mid to late 1800's, Mathew maury
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Challenger Expedition
It was the first expedition organized specifically to gather data on a wide range of ocean features, including ocean temperatures seawater chemistry, currents, marine life, and the geology of the seafloor -john murray and Charles Wyville Thompson-