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delq

PURPOSE ^

DELQ: computes air-sea specific humidity difference.

SYNOPSIS ^

function dq=delq(Ts,Ta,rh)

DESCRIPTION ^

 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]

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

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

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