def sensibleBulk(Tw,Ta,S,rhoa=1.2,Ch=1.5e-3,cpa=1004.67):
    """
    Sensible heat flux from water using the bulk exchange formulation
    
    Inputs:
        Tw - Water temp [C]
        Ta - Air temp [C]
        S - Wind speed magnitude [m s^-1]
        rhoa - air density [kg m^-3]
        Ch - Stanton number
        cpa - Specific heat of air [J kg-1 K-1]
    """    
    return -rhoa*cpa*Ch*S*(Tw-Ta)