!-------------------COMDECK C_SULCHM-------------------------------- ! Parameters for Sulphur Cycle Chemistry REAL & & EVAPTAU, & ! timescale for dissolved SO4 to evaporate & NUCTAU, & ! timescale for accumulation mode particles ! to nucleate once they enter a cloud. & DIFFUSE_AIT, & ! diffusion coefficient of Aitken particles & K_SO2OH_HI, & ! high pressure reaction rate limit & K_DMS_OH, & ! reaction rate for DMS+OH cc/mcl/s & K4_CH3SO2_O3, & ! Rate coeff for CH3SO2+O3 -> CH3SO3+O2 & K5_CH3SO3_HO2, & ! Rate coeff for CH3SO3+HO2 -> MSA+O2 & RMM_O3, & ! relative molecular mass O3 & BRAT_SO2, & ! branching ratio for SO2 in DMS oxidn & BRAT_MSA, & ! branching ratio for MSA in DMS oxidn & AVOGADRO, & ! no. of molecules in 1 mole & RMM_S, & ! relative molecular mass S kg/mole & RMM_H2O2, & ! relative molecular mass H2O2 kg/mole & RMM_HO2, & ! relative molecular mass HO2 kg/mole & RMM_AIR, & ! relative molecular mass dry air & RMM_W, & ! relative molecular mass water & RELM_S_H2O2, & ! rel atomic mass sulphur/RMM_H2O2 & RELM_S_2N, & ! rel atomic mass Sulphur/2*Nitrogen & PARH, & ! power of temp dependence of K_SO2OH_LO & K1, & ! parameters for calcn of K_SO2OH_LO & T1, & ! & FC, & ! parameters for interpolation between & FAC1, & ! LO and HI reaction rate limits & K2,K3,K4, & ! parameters for calcn of K_HO2_HO2 & T2,T3,T4, & ! & CLOUDTAU, & ! air parcel lifetime in cloud & CHEMTAU, & ! chem lifetime in cloud before oxidn & O3_MIN, & ! min mmr of O3 required for oxidn & THOLD ! threshold for cloud liquid water ! ! PARAMETER ( & & EVAPTAU = 300.0, & ! secs (=5 mins) & NUCTAU = 30.0, & ! secs & DIFFUSE_AIT = 1.7134E-9, & ! sq m/s & K_SO2OH_HI = 2.0E-12, & ! cc/mcl/s from STOCHEM model & K_DMS_OH = 9.1E-12, & ! cc/mcl/s & K4_CH3SO2_O3 = 1.0E-14, & ! cc/mcl/s & K5_CH3SO3_HO2 = 4.0E-11, & & RMM_O3 = 4.8E-2, & ! kg/mole & BRAT_SO2 = 0.9, & & BRAT_MSA = 1.0-BRAT_SO2, & & AVOGADRO = 6.022E23, & ! per mole & RMM_S = 3.20E-2, & ! kg/mole & RMM_H2O2 = 3.40E-2, & ! kg/mole & RMM_HO2 = 3.30E-2, & ! kg/mole & RMM_AIR = 2.896E-2, & ! kg/mole & RMM_W = 1.8E-2, & ! kg/mole & RELM_S_H2O2 = 3.206/3.40, & & RELM_S_2N = 3.206/2.80, & & PARH = 3.3, & & K1 = 4.0E-31, & ! (cc/mcl)2/s from STOCHEM & T1 = 300.0, & ! K & FC = 0.45, & ! from STOCHEM model & FAC1 = 1.1904, & ! 0.75-1.27*LOG10(FC) from STOCHEM & K2 = 2.2E-13, & ! cc/mcl/s & K3 = 1.9E-33, & ! (cc/mcl)2/s & K4 = 1.4E-21, & ! cc/mcl & T2 = 600.0, & ! K & T3 = 890.0, & ! K & T4 = 2200.0, & ! K & CLOUDTAU = 1.08E4, & ! secs (=3 hours) & CHEMTAU = 9.0E2, & ! secs (=15 mins) & O3_MIN = 1.6E-8, & !(kg/kg, equiv. 10ppbv) & THOLD = 1.0E-8 & ! kg/kg & ) ! REAL RAD_AIT, & ! median radius of Aitken mode particles & DIAM_AIT, & ! " diameter " & RAD_ACC, & ! median radius of acccumulation mode & DIAM_ACC, & ! " diameter " & CHI, & ! mole fraction of S in particle & RHO_SO4, & ! density of SO4 particle & SIGMA, & ! standard devn of particle size distn ! for accumulation mode & E_PARM, & ! param relating size distns of Ait & Acc & NUM_STAR ! threshold concn of accu mode particles ! below which PSI=1 ! PARAMETER ( & #if defined(A17_2B) & RAD_AIT = 6.5E-9, & ! m #else & RAD_AIT = 24.0E-9, & ! m #endif & DIAM_AIT = 2.0*RAD_AIT, & & RAD_ACC = 95.0E-9, & ! m & DIAM_ACC = 2.0*RAD_ACC, & & CHI = 32.0/132.0, & & RHO_SO4 = 1769.0, & ! kg/m3 & SIGMA = 1.4, & & E_PARM = 0.9398, & & NUM_STAR = 1.0E6 & ! m-3 & ) ! REAL BOLTZMANN !Boltzmanns constant. REAL MFP_REF !Reference value of mean free path. REAL TREF_MFP !Reference temperature for mean free path. REAL PREF_MFP !Reference pressure for mean free path. REAL SIGMA_AIT !Geometric standard deviation of the Aitken ! mode distribution. ! PARAMETER (BOLTZMANN = 1.3804E-23) ! J K-1 PARAMETER (MFP_REF = 6.6E-8 & ! m & , TREF_MFP = 293.15 & ! K & , PREF_MFP = 1.01325E5) ! Pa #if defined(A17_2B) PARAMETER (SIGMA_AIT = 1.30) #else PARAMETER (SIGMA_AIT = 1.45) #endif ! !*---------------------------------------------------------------------