Full-Depth Current Prof ling Around the Global OceanThree Decades of High Pressure for Lowered ADCPsBy Peter Spain Ph.D., Teledyne RD InstrumentsINTRODUCTION? ling offspring revealed deep pathways. solved, full-depth current pro? les since Ever since the unexpected motions of Current meters on moorings showed the early 1990s.the ? rst deep-drifting ? oats, oceanog-changes in time. Free-falling probes al- Deep currents store, carry, and redis-raphers have worked to lift the veil on lowed a pro? le view—closely-spaced tribute important properties for life in deep currents. Direct current measure-measurements showing water current and out of the sea. For example, oxy-ments have come in various guises. velocity versus depth. And lowered AD- gen and nutrient levels are vital where Neutrally-buoyant ? oats and their pro-CPs (LADCP) have provided well-re- the deep waters upwell to supply the Fig. 1November/December 201834 MTRMTR #9 (34-49).indd 34 MTR #9 (34-49).indd 34 11/27/2018 2:00:18 PM11/27/2018 2:00:18 PM