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inputFile_randomized.py
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inputFile_randomized.py
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import time
import numpy as np
from functions import chemistry as cm
class inputs:
def __init__(self,name):
self.name = name
def shuffle(self, seed=None):
if seed:
np.random.seed(seed) # Allow for seed setting for reproducability
#Modern ocean parameters
self.modern_Ts = 285 # [K] pre-industrial modern value
self.modern_pCO2 = 0.000280 # [bar] pre-industrial modern value
self.modern_pH = 8.2 # [unitless] pre-industrial modern value for surface ocean
self.modern_ocean_mass = 1.35e21 # [kg] ocean mass
self.modern_s = 1.8e20/self.modern_ocean_mass # mass balance for ocean and atmosphere
self.modern_pore_mass = 1.35e19 # [kg] mass of pore space water
self.modern_Ca_ocean = 0.01027 # [mol kg-1] modern Ca molality in ocean
# Modern mixing
self.modern_J = np.random.uniform(5.4e15,2.0e16) # [kg yr-1] mixing flux of ocean and pore [70-250 kyr mixing time from Coogan and Gillis 2018]
# Modern C and A fluxes
self.modern_V = np.random.uniform(6.5e12,10.5e12) # [mol C yr-1] total volcanism rate (varies in range 6-10e12)
self.modern_W_carb = np.random.uniform(7e12,14e12) # [mol C yr-1] continental carbonate weathering rate (varies in range 7-14 e12)
self.modern_P_pore = 0.45e12 # [mol C yr-1] pore space carbonate deposition rate (used to calculate seafloor weathering)
self.modern_pvw_x = np.random.uniform(0.5,1.5) # [unitless] relationship between modern pore space precipitation and seafloor weathering (varies in range 0.5-1.5)
#Modern Parameters
self.a_grad = np.random.uniform(0.8,1.4) # [unitless] determines relationship between deep and surface temp (varies in range 0.8-1.4)
self.carb_n = np.random.uniform(1.0,2.5) # [unitless] omega dependency exponent for shelf and pore carbonate deposition (varies in range 1-2.5)
self.carb_xi = np.random.uniform(0.1, 0.5) # [unitless] carbonate weathering dependence exponent on pCO2 (varies in range 0.1-0.5)
self.sil_alpha = np.random.uniform(0.1, 0.5) # [unitless] silicate weathering dependence exponent on pCO2 (varies in range 0.1-0.5)
self.cont_Te = np.random.uniform(10.0,40.0) # [K] e-folding temperature for continental weathering rates (varies in range 10-40)
self.E_bas = np.random.uniform(60.0,100.0) # [kJ mol-1] activation energy for basalt dissolution during seafloor weathering (varies in range 60-100)
self.sea_gamma = np.random.uniform(0.0,0.5) # [unitless] ph dependence exponent for seafloor weathering (varies in range 0-0.5)
self.modern_frac_pel = np.random.uniform(0.4,0.6) # [unitless] fraction of ocean carbonates that are pelagic instead of shelf (0 = all shelf, 1 = all pelagic)
#Neoproterozoic Parameters
self.neoproterozoic_luminosity = np.random.uniform(0.93,0.94) # [unitless] solar luminosity relative to modern
self.shelf_area = 1 # [unitless] area of continental shelves relative to modern
self.f_w = np.random.uniform(0.5,1.5) # [unitless] biological weathering factor (varies in range 0.1-1)
#Snowball Parameters
self.snowball_ocean_temp = 269.5 # [K] fixed snowball ocean temperature
self.snowball_ice_volume = np.random.uniform(0.1,0.3) # [unitless] fraction of ocean that is frozen in the ice sheet
self.snowball_ocean_mass = self.modern_ocean_mass*(1-self.snowball_ice_volume) # [kg] ocean mass under the ice sheet
self.snowball_s = 1.8e20/self.snowball_ocean_mass # mass balance for ocean and atmosphere
self.snowball_shelf_area = np.random.uniform(0.3,0.5) # [unitless] snowball continental shelf area relative to modern
self.snowball_W_carb = np.random.uniform(8e8,18e8) # [mol C yr-1] continental carbonate weathering rate (varies in range 8-18 e8)
self.snowball_W_sil = np.random.uniform(3.3e8,22e8) # [mol eq yr-1] continental silicate weathering rate (varies in range 3.3-22 e8)
self.hyalo = 1 # [unitless] multiplier on the seafloor weathering rate to simulate hyaloclastite
#Post-glacial Parameters
self.meltwater_alk = np.random.uniform(700e-6,1000e-6) # [mol eq kg-1] alkalinity of modern glacial meltwater
self.meltwater_Ca = np.random.uniform(211e-6, 307e-6) # [mol kg-1] calcium molality of modern glacial meltwater
self.meltwater_mass = self.modern_ocean_mass*self.snowball_ice_volume # [kg] mass of the glacial meltwater
self.meltwater_s = 1.8e20/self.meltwater_mass # mass balance for ocean and atmosphere
self.V_frac_modern = 0.75 # [unitless] (subaerial volcanism)/(total volcanism) on modern earth
self.post_shelf_area = np.random.uniform(1,2) # [unitless] post-glacial continental shelf area relative to modern
self.O_sink = np.random.uniform(50e12,200e12) # [mol yr-1] global rate of organic carbon export in post-glacial ocean
self.modern_K = 9.6e17 # [kg yr-1] modern mixing flux between surface and deep ocean
self.t_strat = np.random.uniform(1e3,1e5) # [yr] duration of the stratified post-glacial ocean phase
#Values that need calibration to the modern day
self.modern_W_sea = -1
self.modern_W_sil = -1
self.modern_other_salt = -1
self.modern_Ca_pore = -1
self.modern_Hp = -1
self.k_shelf = -1
self.k_pel = -1
self.k_pore = -1
self.k_Wsea = -1
def redo_calculations(self):
self.modern_s = 1.8e20/self.modern_ocean_mass # mass balance for ocean and atmosphere
self.snowball_ocean_mass = self.modern_ocean_mass*(1-self.snowball_ice_volume)
self.snowball_s = 1.8e20/self.snowball_ocean_mass
self.meltwater_mass = self.modern_ocean_mass*self.snowball_ice_volume
def calibrate_to_modern(self):
# Calculate initial climate and ocean chemistry
Ts = cm.climate_model_JKT(self.modern_pCO2, 0.9906) # set luminosity to recreate modern temp (effictively changing albed within error)
#Ts = self.modern_Ts
Td = cm.deepOceanTemp(Ts, self.a_grad)
Tp = cm.poreSpaceTemp(Td)
[K1o, K2o, H_CO2] = cm.equilibriumRateConstants(Ts)
# Use steady state assumption, modern outgassing rate, modern pore space carbonate precipitation rate, and modern ratio
# of seafloor weathering to pore space precipitation to calculate seafloor and continental weathering rates
self.modern_W_sea = self.modern_pvw_x*self.modern_P_pore
self.modern_W_sil = self.modern_V - self.modern_W_sea
# Get initial chemical conditions for modern surface reservoir
CO2aq_o = H_CO2 * self.modern_pCO2 # dissolved CO2 in ocean
HCO3_o = K1o * CO2aq_o / (10.0 ** -self.modern_pH) # dissolved bicarbonate
CO3_o = K2o * HCO3_o / (10.0 ** -self.modern_pH) # dissolved carbonate
DIC_o = CO3_o + HCO3_o + CO2aq_o # total dissolved inorganic carbon
ALK_o = (2*CO3_o) + HCO3_o
self.modern_other_salt = ALK_o - (2.0*self.modern_Ca_ocean) # other salt in the ocean besides calcium, consistent with modern alk and Ca
# Modern Co and Ao values from ocean chemistry and rates
self.modern_Co = DIC_o + (self.modern_s*self.modern_pCO2)
self.modern_Ao = ALK_o
# Solve the rest of the equations with steady state assumption to get pore space chemistry and carbonate precipitation
DIC_p = DIC_o - (self.modern_P_pore/self.modern_J)
ALK_p = ALK_o - ((2.0/self.modern_J)*(self.modern_P_pore-self.modern_W_sea))
self.modern_P_ocean = -(self.modern_J*(DIC_o-DIC_p)) + self.modern_V + self.modern_W_carb
# Modern Cp and Ap values from ocean chemistry and rates
self.modern_Cp = DIC_p
self.modern_Ap = ALK_p
# Calculate chemistry in pore space
[K1p, K2p, H_CO2p] = cm.equilibriumRateConstants(Tp)
roots_pore = np.roots([self.modern_Ap / (K1p * K2p),
(self.modern_Ap - self.modern_Cp) / K2p,
self.modern_Ap - (2.0 * self.modern_Cp)])
self.modern_Hp = np.max(roots_pore) # H ions in pore space
pH_p = -np.log10(self.modern_Hp) # pH in the pore space
CO2aq_p = DIC_p/(1 + (K1p/self.modern_Hp) + (K1p*K2p/(self.modern_Hp**2))) # dissolved CO2 in pore space
HCO3_p = K1p * CO2aq_p / (10.0 ** -pH_p) # dissolved bicarbonate in pore space
CO3_p = K2p * HCO3_p / (10.0 ** -pH_p) # dissolved carbonate in pore space
self.modern_Ca_pore = 0.5 * (self.modern_Ap - self.modern_other_salt) # calcium in pore space
# Saturation states
omega_o = self.modern_Ca_ocean * CO3_o / cm.carbonateSolubility(Ts)
omega_p = self.modern_Ca_pore * CO3_p / cm.carbonateSolubility(Tp)
# Get proportionality constants for carbonate precipitation
self.k_shelf = (1-self.modern_frac_pel)*self.modern_P_ocean/ (omega_o - 1)**self.carb_n
self.k_pel = (self.modern_frac_pel)*self.modern_P_ocean / omega_o**2.84 # pelagic deposition is 0 during the neoproterozoic, so this value is not used
self.k_pore = self.modern_P_pore / (omega_p - 1) ** self.carb_n
# Get proportionality constants
R = 8.314
self.k_Wsea = self.modern_W_sea / np.exp(-self.E_bas / (R * Tp))
#Recalculate downstream values just in case a parameter was changed (this is not calibration to modern)
self.modern_s = 1.8e20/self.modern_ocean_mass # mass balance for ocean and atmosphere
self.snowball_ocean_mass = self.modern_ocean_mass*(1-self.snowball_ice_volume)
self.snowball_s = 1.8e20/self.snowball_ocean_mass
return