def __init__(self, **kwargs):
super(ManabeWaterVapor, self).__init__(**kwargs)<EOL>p = self.lev<EOL>Q = p / const.ps<EOL>self.RH_profile = self.relative_humidity * ((Q - <NUM_LIT>) / (<NUM_LIT:1>-<NUM_LIT>))<EOL>
Compute water vapor mixing ratio profile following
        Manabe and Wetherald JAS 1967
        Fixed surface relative humidity and a specified fractional profile.

        relative_humidity is the specified surface RH
        qStrat is the minimum specific humidity, ensuring that there is
        some water vapor in the stratosphere.