AS_CONSTS: returns values of many constants used in AIR_SEA TOOLBOX AS_CONSTS: returns values of many constants used in the AIR_SEA TOOLBOX. At end of this file are values of constants from COARE to be used when running the test program t_hfbulktc.m University of Maine Ocean Modelling Group http://rocky.umeoce.maine.edu/hjx/courses/SMS585/my2.5/air_sea/ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 8/19/98: version 1.1 (contributed by RP) 4/7/99: version 1.2 (revised to include COARE test values by AA) 8/5/99: version 2.0 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0001 % AS_CONSTS: returns values of many constants used in AIR_SEA TOOLBOX 0002 % AS_CONSTS: returns values of many constants used in the AIR_SEA 0003 % TOOLBOX. At end of this file are values of constants from COARE 0004 % to be used when running the test program t_hfbulktc.m 0005 %University of Maine Ocean Modelling Group http://rocky.umeoce.maine.edu/hjx/courses/SMS585/my2.5/air_sea/ 0006 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0007 % 8/19/98: version 1.1 (contributed by RP) 0008 % 4/7/99: version 1.2 (revised to include COARE test values by AA) 0009 % 8/5/99: version 2.0 0010 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0011 0012 % ------- physical constants 0013 0014 g = 9.8; % acceleration due to gravity [m/s^2] 0015 sigmaSB = 5.6697e-8; % Stefan-Boltzmann constant [W/m^2/K^4] 0016 eps_air = 0.62197; % molecular weight ratio (water/air) 0017 gas_const_R = 287.04; % gas constant for dry air [J/kg/K] 0018 CtoK = 273.16; % conversion factor for [C] to [K] 0019 0020 0021 % ------- meteorological constants 0022 0023 kappa = 0.4; % von Karman's constant 0024 Charnock_alpha = 0.011; % Charnock constant (for determining roughness length 0025 % at sea given friction velocity), used in Smith 0026 % formulas for drag coefficient and also in Fairall 0027 % and Edson. use alpha=0.011 for open-ocean and 0028 % alpha=0.018 for fetch-limited (coastal) regions. 0029 R_roughness = 0.11; % limiting roughness Reynolds # for aerodynamically 0030 % smooth flow 0031 0032 0033 % ------ defaults suitable for boundary-layer studies 0034 0035 cp = 1004.7; % heat capacity of air [J/kg/K] 0036 rho_air = 1.22; % air density (when required as constant) [kg/m^2] 0037 Ta_default = 10; % default air temperature [C] 0038 P_default = 1020; % default air pressure for Kinneret [mbars] 0039 psych_default = 'screen'; % default psychmometer type (see relhumid.m) 0040 Qsat_coeff = 0.98; % satur. specific humidity coefficient reduced 0041 % by 2% over salt water 0042 0043 0044 % the following are useful in hfbulktc.m 0045 % (and are the default values used in Fairall et al, 1996) 0046 0047 CVB_depth = 600; % depth of convective boundary layer in atmosphere [m] 0048 min_gustiness = 0.5; % min. "gustiness" (i.e., unresolved fluctuations) [m/s] 0049 % should keep this strictly >0, otherwise bad stuff 0050 % might happen (divide by zero errors) 0051 beta_conv = 1.25;% scaling constant for gustiness 0052 0053 0054 % ------ short-wave flux calculations 0055 0056 Solar_const = 1368.0; % the solar constant [W/m^2] represents a 0057 % mean of satellite measurements made over the 0058 % last sunspot cycle (1979-1995) taken from 0059 % Coffey et al (1995), Earth System Monitor, 6, 6-10. 0060 0061 0062 % ------ long-wave flux calculations 0063 0064 emiss_lw = 0.985; % long-wave emissivity of ocean from Dickey et al 0065 % (1994), J. Atmos. Oceanic Tech., 11, 1057-1076. 0066 0067 bulkf_default = 'berliand'; % default bulk formula when downward long-wave 0068 % measurements are not made. 0069 0070 0071 % ------ constants used for COARE; to use simply delete the % 0072 % g = 9.7803; % acceleration due to gravity [m/s^2] 0073 % sigmaSB = 5.67e-8; % Stefan-Boltzmann constant [m^2/K^4] 0074 % gas_const_R = 287.1; % gas constant for dry air [J/kg/K] 0075 % cp = 1004.67; % heat capacity of air [J/kg/K] 0076 % beta_conv = 1.20; % scaling constant for gustiness 0077 % emiss_lw = 0.97; % long-wave emissivity