UKCA & UMUI Tutorial 8

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Adding Wet Deposition

The formulationn used in UKCA is described in Giannakopoulos (1999)[1]. This scheme uses the following formula to calculate the effective Henry's Law coefficient

$H_{eff}=k\left(298\right)\exp \left(-{\frac {\delta H}{R}}\right)$

References

1. Giannakopoulos, C., M. P. Chipperfield, K. S. Law, and J. A. Pyle (1999), Validation and intercomparison of wet and dry deposition schemes using 210Pb in a global three-dimensional off-line chemical transport model, J. Geophys. Res., 104(D19), 23761–23784, doi:10.1029/1999JD900392.

! The following formula is used to calculate the effective Henry's Law coef,
! which takes the affects of dissociation and complex formation on a species'
! solubility (see Giannakopoulos, 1998)
!
!       H(eff) = K(298)exp{[-deltaH/R]x[(1/T)-(1/298)]}
!
! The data in columns 1 and 2 above give the data for this gas-aqueous transfer,
!       Column 1 = K(298) [M/atm]
!       Column 2 = -deltaH/R [K-1]
!
! If the species dissociates in the aqueous phase the above term is multiplied by
! another factor of 1+{K(aq)/[H+]}, where
!       K(aq) = K(298)exp{[-deltaH/R]x[(1/T)-(1/298)]}
! The data in columns 3 and 4 give the data for this aqueous-phase dissociation,
!       Column 3 = K(298) [M]
!       Column 4 = -deltaH/R [K-1]
! The data in columns 5 and 6 give the data for a second dissociation,
! e.g for SO2, HSO3^{-}, and SO3^{2-}
!       Column 5 = K(298) [M]
!       Column 6 = -deltaH/R [K-1]

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Written by Luke Abraham 2013