DELQ: computes air-sea specific humidity difference.
dq=DELQ(Ts,Ta,rh) computes the specific humidity (kg/kg) difference
between the air (as determined by relative humidty rh and air
temperature Ta measurements) and the sea surface (where q is
assumed to be at 98% satuation at the sea surface temperature Ts).
DELQ uses QSAT based on Tetens' formula for saturation vapor
pressure from Buck (1981), J. App. Meteor., 1527-1532. The
dependence of QSAT on pressure is small (<0.5%) and has been
removed using a mean pressure of 1020 mb.
INPUT: Ts - sea surface temperature [C]
Ta - air temperature [C]
rh - relative humidity [%]
OUTPUT: dq - air-sea specific humidity difference [kg/kg]0001 function dq=delq(Ts,Ta,rh) 0002 % DELQ: computes air-sea specific humidity difference. 0003 % dq=DELQ(Ts,Ta,rh) computes the specific humidity (kg/kg) difference 0004 % between the air (as determined by relative humidty rh and air 0005 % temperature Ta measurements) and the sea surface (where q is 0006 % assumed to be at 98% satuation at the sea surface temperature Ts). 0007 % DELQ uses QSAT based on Tetens' formula for saturation vapor 0008 % pressure from Buck (1981), J. App. Meteor., 1527-1532. The 0009 % dependence of QSAT on pressure is small (<0.5%) and has been 0010 % removed using a mean pressure of 1020 mb. 0011 % 0012 % INPUT: Ts - sea surface temperature [C] 0013 % Ta - air temperature [C] 0014 % rh - relative humidity [%] 0015 % 0016 % OUTPUT: dq - air-sea specific humidity difference [kg/kg] 0017 0018 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0019 % 3/8/97: version 1.0 0020 % 4/10/98: version 1.1 0021 % 8/5/99: version 2.0 0022 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0023 0024 dq=0.01.*rh.*qsat(Ta) - 0.98.*qsat(Ts); 0025 0026