What would be the result in the ocean life if there were a sudden change in thermocline and thermohaline circulation?

If there is a sudden change in the thermocline and thermohaline circulations in the ocean waters, the organisms that live in the ocean waters would suffer badly, and there's a even a high chance of a mass extinction occurring. The reason for such a devastating effect will be that the water temperature will change, the salinity levels will change, and the amount of nutrients and at which depth they will be will change. Since every living organism is adapted to be able to survive in a particular environment, sudden changes in it will put the organisms in a situation where they are not suited to survive in such conditions, so t=they will most probably die out.

a maximum–minimum thermometer. the scales are fahrenheit on the inside of the u and celsius on the outside. the current temperature is 23 degrees celsius, the maximum recorded is 25, and the minimum is 15, both read from the base of the small markers in each arm of the u tube. the bulbs are hidden by a plastic housing.

six's thermometer is a registering thermometer which can record the maximum and minimum temperatures reached over a period of time, for example 24 hours. it is used to record the extremes of temperature at a location, for instance in meteorology and horticulture. it was invented by a british scientist james six, born in canterbury, in 1780; [1] the same basic design remains in use.

it is also commonly known as a maximum–minimum, minimum–maximum, maxima–minima or minima–maxima thermometer, of which it is the earliest practical design.

the thermometer indicates the current temperature, and the highest and lowest temperatures since last reset.