;
;jeff snider, univeristy of wyoming, march 2006
;
pro start_satd_isentrope, p_parcel, r_l_isentrope, tk_isentrope, r_v_isentrope
;
common  constants, gascon, rho_h2o, mw_nh42so4, rho_nh42so4, sigma_0,      $
        sigma_t, dsigmadmolality_nh42so4, dsigmadmolality_nacl, mw_h2o,    $
        mw_nacl, rho_nacl, tkmelt, c_nh42so4, a_nh42so4, c_nacl, a_nacl,   $
        cp_air_o, cp_h2o_o, mw_air, gravity, p0, alpha, beta_local,        $
        gascon_h2o, cw_h2o_o, tk_o, lv_o, ew_o, tk_aerosol, salt_type,     $
        epsilon, c_twomey, k_twomey, aerosol_type, right_tail,             $
        gascon_air, tc_base, tk_base, p_base, h_start, hmax,               $
        r0, dt, rmin, rmax, coef, epsilon_aerosol, specific_volume_meas,   $
        nchan, mw_salt, rho_salt, a_salt, c_salt, specific_volume_base,    $
        dsigmadmolality_salt, rho_insoluble, volume_insoluble_to_soluble,  $
        mixrat_tot_1,r_1,geo_sigma_1,mixrat_tot_2,r_2,geo_sigma_2,         $
        tk_start,p_start,sratio_start,mixrat_tot_3,r_3,geo_sigma_3
;
common known_values_satd, rl_a, p_b
;
out = dblarr(12)
in  = dblarr(12)
xguess_local = fltarr(12)
;
rl_a = 0.d
p_b = p_parcel
;
;initial guesses
;
xguess_local(0)  = 1.d-3
xguess_local(1)  = 1000.d
xguess_local(2)  = 1.d-3
xguess_local(3)  = 1000.d
xguess_local(4)  = cp_air_o*alog(tk_base/tk_o)
xguess_local(5)  = p_base
xguess_local(6)  = lv_o
xguess_local(7)  = cp_air_o*alog(tk_base/tk_o)
xguess_local(8)  = tk_base
xguess_local(9)  = 1.d-3
xguess_local(10) = p_base
xguess_local(11) = lv_o
;
out = newton (xguess_local, 'satd_isentrope', /double)
;
r_l_isentrope = out(9)
tk_isentrope  = out(8)
r_v_isentrope = out(2)
;
return
;
end