Editing Internal wave (section)

===Surface slicks===
While internal waves of higher magnitudes will often break after crossing over the shelf break, smaller trains will proceed across the shelf unbroken.<ref name="Winant CD 1980"/><ref>Cairns JL (1968) Thermocline strength fluctuations in coastal waters. Journal of Geophysical Research 73:2591–2595</ref> At low wind speeds these internal waves are evidenced by the formation of wide surface slicks, oriented parallel to the bottom topography, which progress shoreward with the internal waves.<ref name="Ewing G 1950">Ewing G (1950) Slicks, surface films and internal waves. [[Journal of Marine Research]] 9:161–187</ref><ref>LaFond EC (1959) Sea surface features and internal waves in the sea. Indian Journal of Meteorology and Geophysics 10:415–419</ref> Waters above an internal wave converge and sink in its trough and upwell and diverge over its crest.<ref name="Ewing G 1950"/> The convergence zones associated with internal wave troughs often accumulate oils and [[flotsam]] that occasionally progress shoreward with the slicks.<ref>Arthur RS (1954) Oscillations in sea temperature at Scripps and Oceanside piers. Deep-Sea Research 2:129–143</ref><ref name="Shanks AL 1983">Shanks AL (1983) Surface slicks associated with tidally forces internal waves may transport pelagic larvae of benthic invertebrates and fishes shoreward. Marine Ecology Progress Series 13:311–315</ref> These rafts of flotsam can also harbor high concentrations of larvae of [[invertebrates]] and fish an order of magnitude higher than the surrounding waters.<ref name="Shanks AL 1983"/>