Tropical lakes often have two or more thermoclines, a daily thermocline and a
seasonal thermocline, as described by Lewis (1973; 1983; 1984;) in Lake Lanao and
Valencia. Formation of multiple thermoclines occurs when a relatively cool epilimnion
experiences surface warming coincident with low wind stress, causing a second
thermocline to develop above the first. This combination of transient and persistent
thermoclines is seen in varying degrees in many tropical lakes (Baxter et al. 1965; Kling 1988; Melack 1978). It has been suggested that changes in mixing depth in the tropics are largely dependent on passing weather events rather than predictable seasonal changes as is the case for temperate lakes, which explains their unpredictable nature (Lewis 1973;Talling and Lemoalle 1998).