Because salinity (in concert with temperature) affects the density of seawater, it can play a role in its vertical stratification. Essentially, lower salinity water (= lower density) floats on top of higher salinity water (= higher density).
Alternative definition, a choice limited to one of two or more possibilities, as of things, propositions, or courses of action, the selection of which precludes any other possibility: You have the alternative of riding or walking. See more.
Â· just now.  1 Down alternative is a tricky term because it can mean an alternative to down, such as cotton or wool or anything else that isn't down, or it can mean a synthetic alternative to down. 2  Its not real goose feathers, its just very similar. Down is way better btw and sooo warm. I have an alternative and it tends to separate.