North Atlantic Deep Water flows southward below the thermocline of the subtropical gyre. The halocline often coincides with the thermocline, and the combination produces a pronounced pycnocline. The water column is generally well-mixed, with no evidence of a significant halocline or thermocline. The thermocline may be present in shallower coastal waters. The tropical thermocline is typically deeper than the thermocline at higher latitudes. Baroclinic waves also generate significant displacements of the oceanic thermocline, often of tens of meters. Wind shear and thermocline produce such inhomogeneities. Temperatures fall through a thermocline to temperatures between and . During the summer, they are typically found in the colder water below the thermocline. Deep-dwelling coccolithophore species abundance is greatly affected by nutricline and thermocline depths. These changes in surface temperature reflect changes in the depth of the thermocline. Asia blocks heat export and prevents the ventilation of the Indian Ocean thermocline. Between these zones is a band of rapid temperature change called the thermocline. Water temperature is steady at with no thermocline, and is typically very clear. Adult kokanee can be found in open water where the thermocline is around .