Answer to Question 1
Tropical lower-latitude surface waters are lower density than high-latitude surface waters. As you go deeper in the water column, density increases, so there is a pycnocline in low-latitude waters, while high-latitude deep water is only marginally denser than the water at surface, so there is no pycnocline.
Answer to Question 2
Density is influenced by temperature and salinity. Temperature has the greatest influence on surface seawater density because variations in surface seawater temperature are greater than salinity variations.
Fast-flowing waters of the Humber River, Newfoundland, are a challenge to Atlantic salmon migrating
Rank-order correlations show that differential consistency remains high from childhood through late ...
The diminishing effects on body weight of a low-calorie diet and a high-calorie diet.
Variations in the Ocean’s Surface Temperature and Salinity with Latitude
What is the volume of 19.6 g of a liquid that has a density of 0.967 g/mL?
Physics - Density and Pressure