Effects of Precipitation on Ocean Mixed-Layer Temperature and Salinity as Simulated in a 2-D Coupled Ocean-Cloud Resolving Atmosphere Model

摘要: A two-dimensional coupled ocean-cloud resolving atmosphere model is used to investigate possible roles of convective scale ocean disturbances induced by atmospheric precipitation on mixed-layer heat and salt budgets. The couples a cloud with an embedded mixed layer-ocean circulation model. Five experiment are performed under imposed large-scale forcing in terms vertical velocity derived from the TOGA COARE observations during selected seven-day period. dominant variability temperature salinity simulated forcing. temperatures experiments 1-D 2-D models show similar variations when effects not included. When included, however, differences domain-mean between could be as large 0.3 PSU 0.4 C respectively. Without fresh water effects, nocturnal loss over surface causes deep layers weak cooling rates so that tend horizontally-uniform. flux, shallow areas while layer convection-free have horizontal fluctuations. Furthermore, flux exhibits larger spatial fluctuations than because heavy rainfall occurs broad non-convective or clear areas, whereas diurnal signals whole yield high correlation flux. As result, salinities contribute more density do temperatures.