Downwell

Some of the northward-flowing waters turn eastward and enter the Throughflow sponge above 1300 m (Figure 5b), where they downwell and return to the interior and spread both to the south and the north (Figure 5c).

Source: wiktionary

Ozone in the upper troposphere which downwells to the surface can also result from photochemical production enhanced by high levels of NOx from the natural stratosphere, aircraft emissions of NOx in the upper troposphere [Liu et al., 1980],

Source: wiktionary

This cold water downwells and flows below the saltier but warmer surface water.

Source: wiktionary

This measurement, as Region 4 stated, has been "commonly used to measure marine turbidity; it does not measure downwelling ambient light."

Source: wiktionary