aero_rep_modal_binned_mass.c

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/* Copyright (C) 2021 Barcelona Supercomputing Center and University of
 * Illinois at Urbana-Champaign
 * SPDX-License-Identifier: MIT
 *
 * Modal mass aerosol representation functions
 *
 */
/** \file
 * \brief Modal mass aerosol representation functions
 */
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <camp/aero_phase_solver.h>
#include <camp/aero_reps.h>
#include <camp/camp_solver.h>
 
// TODO Lookup environmental indicies during initialization
#define TEMPERATURE_K_ env_data[0]
#define PRESSURE_PA_ env_data[1]
 
#define UPDATE_GMD 0
#define UPDATE_GSD 1
 
#define BINNED 1
#define MODAL 2
 
#define NUM_SECTION_ (int_data[0])
#define INT_DATA_SIZE_ (int_data[1])
#define FLOAT_DATA_SIZE_ (int_data[2])
#define AERO_REP_ID_ (int_data[3])
#define NUM_INT_PROP_ 4
#define NUM_FLOAT_PROP_ 0
#define NUM_ENV_PARAM_ 0
#define MODE_INT_PROP_LOC_(x) (int_data[NUM_INT_PROP_ + x] - 1)
#define MODE_FLOAT_PROP_LOC_(x) (int_data[NUM_INT_PROP_ + NUM_SECTION_ + x] - 1)
#define SECTION_TYPE_(x) (int_data[MODE_INT_PROP_LOC_(x)])
 
// For modes, NUM_BINS_ = 1
#define NUM_BINS_(x) (int_data[MODE_INT_PROP_LOC_(x) + 1])
 
// Number of aerosol phases in this mode/bin set
#define NUM_PHASE_(x) (int_data[MODE_INT_PROP_LOC_(x) + 2])
 
// Phase state and model data ids
#define PHASE_STATE_ID_(x, y, b) \
  (int_data[MODE_INT_PROP_LOC_(x) + 3 + b * NUM_PHASE_(x) + y] - 1)
#define PHASE_MODEL_DATA_ID_(x, y, b)                                  \
  (int_data[MODE_INT_PROP_LOC_(x) + 3 + NUM_BINS_(x) * NUM_PHASE_(x) + \
            b * NUM_PHASE_(x) + y] -                                   \
   1)
 
// Number of Jacobian elements in a phase
#define PHASE_NUM_JAC_ELEM_(x, y, b)                                      \
  int_data[MODE_INT_PROP_LOC_(x) + 3 + 2 * NUM_BINS_(x) * NUM_PHASE_(x) + \
           b * NUM_PHASE_(x) + y]
 
// Bin diameter (for bins)
#define BIN_DP_(x, b) (float_data[MODE_FLOAT_PROP_LOC_(x) + b * 3])
 
// GMD and GSD - only used for modes
#define GMD_(x) (aero_rep_env_data[x])
#define GSD_(x) (aero_rep_env_data[NUM_SECTION_ + x])
 
// Real-time number concentration - used for modes and bins - for modes, b=0
#define NUMBER_CONC_(x, b) (float_data[MODE_FLOAT_PROP_LOC_(x) + b * 3 + 1])
 
// Real-time effective radius - for modes, b=0
#define EFFECTIVE_RADIUS_(x, b) \
  (float_data[MODE_FLOAT_PROP_LOC_(x) + b * 3 + 2])
 
// Real-time phase mass (kg/m^3) - used for modes and bins - for modes, b=0
#define PHASE_MASS_(x, y, b)                                                   \
  (float_data[MODE_FLOAT_PROP_LOC_(x) + 3 * NUM_BINS_(x) + b * NUM_PHASE_(x) + \
              y])
 
// Real-time phase average MW (kg/mol) - used for modes and bins - for modes,
// b=0
#define PHASE_AVG_MW_(x, y, b)                                               \
  (float_data[MODE_FLOAT_PROP_LOC_(x) + (3 + NUM_PHASE_(x)) * NUM_BINS_(x) + \
              b * NUM_PHASE_(x) + y])
 
/** \brief Flag Jacobian elements used in calcualtions of mass and volume
 *
 * \param model_data Pointer to the model data
 * \param aero_rep_int_data Pointer to the aerosol representation integer data
 * \param aero_rep_float_data Pointer to the aerosol representation
 *                            floating-point data
 * \param aero_phase_idx Index of the aerosol phase to find elements for
 * \param jac_struct 1D array of flags indicating potentially non-zero
 *                   Jacobian elements. (The dependent variable should have
 *                   been chosen by the calling function.)
 * \return Number of Jacobian elements flagged
 */
int aero_rep_modal_binned_mass_get_used_jac_elem(ModelData *model_data,
                                                 int aero_phase_idx,
                                                 int *aero_rep_int_data,
                                                 double *aero_rep_float_data,
                                                 bool *jac_struct) {
  int *int_data = aero_rep_int_data;
  double *float_data = aero_rep_float_data;
 
  int num_flagged_elem = 0;
 
  // Loop through the modes/bins flagging Jacobian elements used by each
  // aerosol phase
  for (int i_section = 0; i_section < NUM_SECTION_ && aero_phase_idx >= 0;
       i_section++) {
    for (int i_bin = 0; i_bin < NUM_BINS_(i_section) && aero_phase_idx >= 0;
         i_bin++) {
      for (int i_phase = 0;
           i_phase < NUM_PHASE_(i_section) && aero_phase_idx >= 0; i_phase++) {
        if (aero_phase_idx == 0) {
          for (int j_phase = 0; j_phase < NUM_PHASE_(i_section); j_phase++) {
            PHASE_NUM_JAC_ELEM_(i_section, j_phase, i_bin) =
                aero_phase_get_used_jac_elem(
                    model_data, PHASE_MODEL_DATA_ID_(i_section, j_phase, i_bin),
                    PHASE_STATE_ID_(i_section, j_phase, i_bin), jac_struct);
            num_flagged_elem += PHASE_NUM_JAC_ELEM_(i_section, j_phase, i_bin);
          }
        }
        aero_phase_idx -= 1;
      }
    }
  }
 
  return num_flagged_elem;
}
 
/** \brief Flag elements on the state array used by this aerosol representation
 *
 * The modal mass aerosol representation functions do not use state array values
 *
 * \param aero_rep_int_data Pointer to the aerosol representation integer data
 * \param aero_rep_float_data Pointer to the aerosol representation
 *                            floating-point data
 * \param state_flags Array of flags indicating state array elements used
 */
void aero_rep_modal_binned_mass_get_dependencies(int *aero_rep_int_data,
                                                 double *aero_rep_float_data,
                                                 bool *state_flags) {
  int *int_data = aero_rep_int_data;
  double *float_data = aero_rep_float_data;
 
  return;
}
 
/** \brief Update aerosol representation data for new environmental conditions
 *
 * The modal mass aerosol representation is not updated for new environmental
 * conditions
 *
 * \param model_data Pointer to the model data
 * \param aero_rep_int_data Pointer to the aerosol representation integer data
 * \param aero_rep_float_data Pointer to the aerosol representation
 *                            floating-point data
 * \param aero_rep_env_data Pointer to the aerosol representation
 *                          environment-dependent parameters
 */
void aero_rep_modal_binned_mass_update_env_state(ModelData *model_data,
                                                 int *aero_rep_int_data,
                                                 double *aero_rep_float_data,
                                                 double *aero_rep_env_data) {
  int *int_data = aero_rep_int_data;
  double *float_data = aero_rep_float_data;
  double *env_data = model_data->grid_cell_env;
 
  return;
}
 
/** \brief Update aerosol representation data for a new state
 *
 * The modal mass aerosol representation recalculates effective radius and
 * number concentration for each new state.
 *
 * \param model_data Pointer to the model data, including the state array
 * \param aero_rep_int_data Pointer to the aerosol representation integer data
 * \param aero_rep_float_data Pointer to the aerosol representation
 *                            floating-point data
 * \param aero_rep_env_data Pointer to the aerosol representation
 *                          environment-dependent parameters
 */
void aero_rep_modal_binned_mass_update_state(ModelData *model_data,
                                             int *aero_rep_int_data,
                                             double *aero_rep_float_data,
                                             double *aero_rep_env_data) {
  int *int_data = aero_rep_int_data;
  double *float_data = aero_rep_float_data;
 
  // Loop through the modes and calculate effective radius and number
  // concentration
  for (int i_section = 0; i_section < NUM_SECTION_; i_section++) {
    double volume, mass;
    switch (SECTION_TYPE_(i_section)) {
      // Mode
      case (MODAL):
 
        // Sum the volumes of each species in the mode [m3 m-3]
        volume = 0.0;
        for (int i_phase = 0; i_phase < NUM_PHASE_(i_section); i_phase++) {
          // Get a pointer to the phase on the state array
          double *state = (double *)(model_data->grid_cell_state);
          state += PHASE_STATE_ID_(i_section, i_phase, 0);
 
          // Set the aerosol-phase mass [kg m-3] and average MW [kg mol-1]
          aero_phase_get_mass__kg_m3(
              model_data, PHASE_MODEL_DATA_ID_(i_section, i_phase, 0), state,
              &(PHASE_MASS_(i_section, i_phase, 0)),
              &(PHASE_AVG_MW_(i_section, i_phase, 0)), NULL, NULL);
 
          // Get the phase volume [m3 m-3]
          double phase_volume = 0.0;
          aero_phase_get_volume__m3_m3(
              model_data, PHASE_MODEL_DATA_ID_(i_section, i_phase, 0), state,
              &phase_volume, NULL);
          volume += phase_volume;
        }
 
        // Calculate the number concentration [# m-3] based on the total mode
        // volume (see aero_rep_modal_binned_mass_get_number_conc for details)
        NUMBER_CONC_(i_section, 0) =
            volume * 6.0 /
            (M_PI * pow(GMD_(i_section), 3) *
             exp(9.0 / 2.0 * pow(log(GSD_(i_section)), 2)));
 
        break;
 
      // Bins
      case (BINNED):
 
        // Loop through the bins
        for (int i_bin = 0; i_bin < NUM_BINS_(i_section); i_bin++) {
          // Sum the volumes of each species in the bin [m3 m-3]
          volume = 0.0;
          for (int i_phase = 0; i_phase < NUM_PHASE_(i_section); i_phase++) {
            // Get a pointer to the phase on the state array
            double *state = (double *)(model_data->grid_cell_state);
            state += PHASE_STATE_ID_(i_section, i_phase, i_bin);
 
            // Set the aerosol-phase mass [kg m-3] and average MW [kg mol-1]
            aero_phase_get_mass__kg_m3(
                model_data, PHASE_MODEL_DATA_ID_(i_section, i_phase, i_bin),
                state, &(PHASE_MASS_(i_section, i_phase, i_bin)),
                &(PHASE_AVG_MW_(i_section, i_phase, i_bin)), NULL, NULL);
 
            // Get the phase volume [m3 m-3]
            double phase_volume = 0.0;
            aero_phase_get_volume__m3_m3(
                model_data, PHASE_MODEL_DATA_ID_(i_section, i_phase, i_bin),
                state, &phase_volume, NULL);
            volume += phase_volume;
          }
 
          // Calculate the number concentration [# m-3] based on the total bin
          // volume (see aero_rep_modal_binned_mass_get_number_conc for details)
          NUMBER_CONC_(i_section, i_bin) =
              volume * 3.0 / (4.0 * M_PI) /
              pow(BIN_DP_(i_section, i_bin) / 2.0, 3);
        }
 
        break;
    }
  }
 
  return;
}
 
/** \brief Get the effective particle radius \f$r_{eff}\f$ (m)
 *
 * The modal mass effective radius is calculated for a log-normal distribution
 * where the geometric mean diameter (\f$\tilde{D}_n\f$) and geometric standard
 * deviation (\f$\sigma_g\f$) are set by the aerosol model prior to
 * solving the chemistry. Thus, all \f$\frac{\partial r_{eff}}{\partial y}\f$
 * are zero. The effective radius is calculated according to the equation given
 * in Table 1 of Zender \cite Zender2002 :
 *
 * \f[
 * \tilde{\sigma_g} \equiv ln( \sigma_g )
 * \f]
 * \f[
 * D_s = D_{eff} = \tilde{D_n} e^{5 \tilde{\sigma}_g^2 / 2}
 * \f]
 * \f[
 * r_{eff} = \frac{D_{eff}}{2}
 * \f]
 *
 * For bins, \f$r_{eff}\f$ is assumed to be the bin radius.
 *
 * \param model_data Pointer to the model data, including the state array
 * \param aero_phase_idx Index of the aerosol phase within the representation
 * \param radius Effective particle radius (m)
 * \param partial_deriv \f$\frac{\partial r_{eff}}{\partial y}\f$ where \f$y\f$
 *                       are species on the state array
 * \param aero_rep_int_data Pointer to the aerosol representation integer data
 * \param aero_rep_float_data Pointer to the aerosol representation
 *                            floating-point data
 * \param aero_rep_env_data Pointer to the aerosol representation
 *                          environment-dependent parameters
 */
void aero_rep_modal_binned_mass_get_effective_radius__m(
    ModelData *model_data, int aero_phase_idx, double *radius,
    double *partial_deriv, int *aero_rep_int_data, double *aero_rep_float_data,
    double *aero_rep_env_data) {
  int *int_data = aero_rep_int_data;
  double *float_data = aero_rep_float_data;
 
  for (int i_section = 0; i_section < NUM_SECTION_; i_section++) {
    for (int i_bin = 0; i_bin < NUM_BINS_(i_section); i_bin++) {
      aero_phase_idx -= NUM_PHASE_(i_section);
      if (aero_phase_idx < 0) {
        *radius = EFFECTIVE_RADIUS_(i_section, i_bin);
        // Effective radii are constant for bins and modes
        if (partial_deriv) {
          for (int i_phase = 0; i_phase < NUM_PHASE_(i_section); ++i_phase) {
            for (int i_elem = 0;
                 i_elem < PHASE_NUM_JAC_ELEM_(i_section, i_phase, i_bin);
                 ++i_elem) {
              *(partial_deriv++) = ZERO;
            }
          }
        }
        i_section = NUM_SECTION_;
        break;
      }
    }
  }
 
  return;
}
 
/** \brief Get the effective particle surface area \f$r_{eff}\f$ (m)
 *
 * The surface area interface that exists between two specified phases within
 * the modal/binned aerosol representation always returns an error, because no
 * specific internal structure is assumed for phases within modes or bins.
 *
 * \param model_data Pointer to the model data, including the state array
 * \param aero_phase_idx_first Index of the first aerosol phase within the representation
 * \param aero_phase_idx_second Index of the second aerosol phase within the representation
 * \param surface_area Effective surface area of interface between phases (m^2)
 * \param partial_deriv \f$\frac{\partial sa_{eff}}{\partial y}\f$ where \f$y\f$
 *                       are species on the state array
 * \param aero_rep_int_data Pointer to the aerosol representation integer data
 * \param aero_rep_float_data Pointer to the aerosol representation
 *                            floating-point data
 * \param aero_rep_env_data Pointer to the aerosol representation
 *                          environment-dependent parameters
 */
void aero_rep_modal_binned_mass_get_interface_surface_area__m2(
    ModelData *model_data, int aero_phase_idx_first, int aero_phase_idx_second,
    double *surface_area, double *partial_deriv, int *aero_rep_int_data, 
    double *aero_rep_float_data, double *aero_rep_env_data) {
  int *int_data = aero_rep_int_data;
  double *float_data = aero_rep_float_data;
 
 
  printf("\n\nERROR There are no adjacent pairs in the modal/binned representation.\n\n");  
  exit(1);
}
 
/** \brief Get the particle number concentration \f$n\f$
 * (\f$\mbox{\si{\#\per\cubic\metre}}\f$)
 *
 * The modal mass number concentration is calculated for a log-normal
 * distribution where the geometric mean diameter (\f$\tilde{D}_n\f$) and
 * geometric standard deviation (\f$\tilde{\sigma}_g\f$) are set by the aerosol
 * model prior to solving the chemistry. The number concentration is
 * calculated according to the equation given in Table 1 of Zender
 * \cite Zender2002 :
 * \f[
 *      n = N_0 = \frac{6V_0}{\pi}\tilde{D}_n^{-3}e^{-9
 * ln(\tilde{\sigma}_g)^2/2} \f] \f[ V_0 = \sum_i{\frac{m_i}{\rho_i}} \f] where
 * \f$\rho_i\f$ and \f$m_i\f$ are the density and total mass of species \f$i\f$
 * in the specified mode.
 *
 * The binned number concentration is calculated according to:
 * \f[
 *     n = V_0 / V_p
 * \f]
 * \f[
 *     V_p = \frac{4}{3}\pi r^{3}
 * \f]
 * where \f$r\f$ is the radius of the size bin and \f$V_0\f$ is defined as
 * above.
 *
 * \param model_data Pointer to the model data, including the state array
 * \param aero_phase_idx Index of the aerosol phase within the representation
 * \param number_conc Particle number concentration, \f$n\f$
 *                    (\f$\mbox{\si{\#\per\cubic\centi\metre}}\f$)
 * \param partial_deriv \f$\frac{\partial n}{\partial y}\f$ where \f$y\f$ are
 *                      the species on the state array
 * \param aero_rep_int_data Pointer to the aerosol representation integer data
 * \param aero_rep_float_data Pointer to the aerosol representation
 *                            floating-point data
 * \param aero_rep_env_data Pointer to the aerosol representation
 *                          environment-dependent parameters
 */
void aero_rep_modal_binned_mass_get_number_conc__n_m3(
    ModelData *model_data, int aero_phase_idx, double *number_conc,
    double *partial_deriv, int *aero_rep_int_data, double *aero_rep_float_data,
    double *aero_rep_env_data) {
  int *int_data = aero_rep_int_data;
  double *float_data = aero_rep_float_data;
 
  for (int i_section = 0; i_section < NUM_SECTION_ && aero_phase_idx >= 0;
       i_section++) {
    for (int i_bin = 0; i_bin < NUM_BINS_(i_section) && aero_phase_idx >= 0;
         i_bin++) {
      aero_phase_idx -= NUM_PHASE_(i_section);
      if (aero_phase_idx < 0) {
        *number_conc = NUMBER_CONC_(i_section, i_bin);
        if (partial_deriv) {
          for (int i_phase = 0; i_phase < NUM_PHASE_(i_section); ++i_phase) {
            // Get a pointer to the phase on the state array
            double *state = (double *)(model_data->grid_cell_state);
            state += PHASE_STATE_ID_(i_section, i_phase, i_bin);
 
            // Get the aerosol phase volume [m3 m-3]
            double phase_volume = 0.0;
            aero_phase_get_volume__m3_m3(
                model_data, PHASE_MODEL_DATA_ID_(i_section, i_phase, i_bin),
                state, &phase_volume, partial_deriv);
 
            // Convert d_vol/d_conc to d_number/d_conc
            for (int i_elem = 0;
                 i_elem < PHASE_NUM_JAC_ELEM_(i_section, i_phase, i_bin);
                 ++i_elem) {
              switch (SECTION_TYPE_(i_section)) {
                case (MODAL):
                  *(partial_deriv++) *=
                      6.0 / (M_PI * pow(GMD_(i_section), 3) *
                             exp(9.0 / 2.0 * pow(log(GSD_(i_section)), 2)));
                  break;
                case (BINNED):
                  *(partial_deriv++) *= 3.0 / (4.0 * M_PI) /
                                        pow(BIN_DP_(i_section, i_bin) / 2.0, 3);
                  break;
              }
            }
          }
        }
        i_section = NUM_SECTION_;
        break;
      }
    }
  }
 
  return;
}
 
/** \brief Get the type of aerosol concentration used.
 *
 * Modal mass concentrations are per-mode or per-bin.
 *
 * \param aero_phase_idx Index of the aerosol phase within the representation
 * \param aero_conc_type Pointer to int that will hold the concentration type
 *                       code
 * \param aero_rep_int_data Pointer to the aerosol representation integer data
 * \param aero_rep_float_data Pointer to the aerosol representation
 *                            floating-point data
 * \param aero_rep_env_data Pointer to the aerosol representation
 *                          environment-dependent parameters
 */
void aero_rep_modal_binned_mass_get_aero_conc_type(int aero_phase_idx,
                                                   int *aero_conc_type,
                                                   int *aero_rep_int_data,
                                                   double *aero_rep_float_data,
                                                   double *aero_rep_env_data) {
  int *int_data = aero_rep_int_data;
  double *float_data = aero_rep_float_data;
 
  *aero_conc_type = 1;
 
  return;
}
 
/** \brief Get the total mass in an aerosol phase \f$m\f$
 * (\f$\mbox{\si{\kilogram\per\cubic\metre}}\f$)
 *
 * \param model_data Pointer to the model data, including the state array
 * \param aero_phase_idx Index of the aerosol phase within the representation
 * \param aero_phase_mass Total mass in the aerosol phase, \f$m\f$
 *                        (\f$\mbox{\si{\kilogram\per\cubic\metre}}\f$)
 * \param partial_deriv \f$\frac{\partial m}{\partial y}\f$ where \f$y\f$ are
 *                      the species on the state array
 * \param aero_rep_int_data Pointer to the aerosol representation integer data
 * \param aero_rep_float_data Pointer to the aerosol representation
 *                            floating-point data
 * \param aero_rep_env_data Pointer to the aerosol representation
 *                          environment-dependent parameters
 */
void aero_rep_modal_binned_mass_get_aero_phase_mass__kg_m3(
    ModelData *model_data, int aero_phase_idx, double *aero_phase_mass,
    double *partial_deriv, int *aero_rep_int_data, double *aero_rep_float_data,
    double *aero_rep_env_data) {
  int *int_data = aero_rep_int_data;
  double *float_data = aero_rep_float_data;
 
  for (int i_section = 0; i_section < NUM_SECTION_ && aero_phase_idx >= 0;
       ++i_section) {
    for (int i_bin = 0; i_bin < NUM_BINS_(i_section) && aero_phase_idx >= 0;
         ++i_bin) {
      if (aero_phase_idx < 0 || aero_phase_idx >= NUM_PHASE_(i_section)) {
        aero_phase_idx -= NUM_PHASE_(i_section);
        continue;
      }
      for (int i_phase = 0; i_phase < NUM_PHASE_(i_section); ++i_phase) {
        if (aero_phase_idx == 0) {
          *aero_phase_mass = PHASE_MASS_(i_section, i_phase, i_bin);
          if (partial_deriv) {
            // Get a pointer to the phase on the state array
            double *state = (double *)(model_data->grid_cell_state);
            state += PHASE_STATE_ID_(i_section, i_phase, i_bin);
 
            // Get d_mass / d_conc
            double mass, mw;
            aero_phase_get_mass__kg_m3(
                model_data, PHASE_MODEL_DATA_ID_(i_section, i_phase, i_bin),
                state, &mass, &mw, partial_deriv, NULL);
            partial_deriv += PHASE_NUM_JAC_ELEM_(i_section, i_phase, i_bin);
          }
 
          // Other phases present in the bin or mode do not contribute to
          // the aerosol phase mass
        } else if (partial_deriv) {
          for (int i_elem = 0;
               i_elem < PHASE_NUM_JAC_ELEM_(i_section, i_phase, i_bin);
               ++i_elem) {
            *(partial_deriv++) = ZERO;
          }
        }
        aero_phase_idx -= 1;
      }
    }
  }
 
  return;
}
 
/** \brief Get the average molecular weight in an aerosol phase
 **        \f$m\f$ (\f$\mbox{\si{\kilogram\per\mole}}\f$)
 *
 * \param model_data Pointer to the model data, including the state array
 * \param aero_phase_idx Index of the aerosol phase within the representation
 * \param aero_phase_avg_MW Average molecular weight in the aerosol phase
 *                          (\f$\mbox{\si{\kilogram\per\mole}}\f$)
 * \param partial_deriv \f$\frac{\partial m}{\partial y}\f$ where \f$y\f$ are
 *                      the species on the state array
 * \param aero_rep_int_data Pointer to the aerosol representation integer data
 * \param aero_rep_float_data Pointer to the aerosol representation
 *                            floating-point data
 * \param aero_rep_env_data Pointer to the aerosol representation
 *                          environment-dependent parameters
 */
void aero_rep_modal_binned_mass_get_aero_phase_avg_MW__kg_mol(
    ModelData *model_data, int aero_phase_idx, double *aero_phase_avg_MW,
    double *partial_deriv, int *aero_rep_int_data, double *aero_rep_float_data,
    double *aero_rep_env_data) {
  int *int_data = aero_rep_int_data;
  double *float_data = aero_rep_float_data;
 
  for (int i_section = 0; i_section < NUM_SECTION_ && aero_phase_idx >= 0;
       ++i_section) {
    for (int i_bin = 0; i_bin < NUM_BINS_(i_section) && aero_phase_idx >= 0;
         ++i_bin) {
      if (aero_phase_idx < 0 || aero_phase_idx >= NUM_PHASE_(i_section)) {
        aero_phase_idx -= NUM_PHASE_(i_section);
        continue;
      }
      for (int i_phase = 0; i_phase < NUM_PHASE_(i_section); ++i_phase) {
        if (aero_phase_idx == 0) {
          *aero_phase_avg_MW = PHASE_AVG_MW_(i_section, i_phase, i_bin);
          if (partial_deriv) {
            // Get a pointer to the phase on the state array
            double *state = (double *)(model_data->grid_cell_state);
            state += PHASE_STATE_ID_(i_section, i_phase, i_bin);
 
            // Get d_MW / d_conc
            double mass, mw;
            aero_phase_get_mass__kg_m3(
                model_data, PHASE_MODEL_DATA_ID_(i_section, i_phase, i_bin),
                state, &mass, &mw, NULL, partial_deriv);
            partial_deriv += PHASE_NUM_JAC_ELEM_(i_section, i_phase, i_bin);
          }
 
          // Other phases present in the bin/mode do not contribute to the
          // average MW of the aerosol phase
        } else if (partial_deriv) {
          for (int i_elem = 0;
               i_elem < PHASE_NUM_JAC_ELEM_(i_section, i_phase, i_bin);
               ++i_elem) {
            *(partial_deriv++) = ZERO;
          }
        }
        aero_phase_idx -= 1;
      }
    }
  }
 
  return;
}
 
/** \brief Update the aerosol representation data
 *
 * The model mass aerosol representation update data is structured as follows:
 *
 *  - \b int aero_rep_id (Id of one or more aerosol representations set by the
 *       host model using the
 *       camp_aero_rep_modal_binned_mass::aero_rep_modal_binned_mass_t::set_id
 *       function prior to initializing the solver.)
 *  - \b int update_type (Type of update to perform. Can be UPDATE_GMD or
 *       UPDATE_GSD.)
 *  - \b int section_id (Index of the mode to update.)
 *  - \b double new_value (Either the new GMD (m) or the new GSD (unitless).)
 *
 * \param update_data Pointer to the updated aerosol representation data
 * \param aero_rep_int_data Pointer to the aerosol representation integer data
 * \param aero_rep_float_data Pointer to the aerosol representation
 *                            floating-point data
 * \param aero_rep_env_data Pointer to the aerosol representation
 *                          environment-dependent parameters
 * \return Flag indicating whether this is the aerosol representation to update
 */
bool aero_rep_modal_binned_mass_update_data(void *update_data,
                                            int *aero_rep_int_data,
                                            double *aero_rep_float_data,
                                            double *aero_rep_env_data) {
  int *int_data = aero_rep_int_data;
  double *float_data = aero_rep_float_data;
 
  int *aero_rep_id = (int *)update_data;
  int *update_type = (int *)&(aero_rep_id[1]);
  int *section_id = (int *)&(update_type[1]);
  double *new_value = (double *)&(section_id[1]);
  bool ret_val = false;
 
  // Set the new GMD or GSD for matching aerosol representations
  if (*aero_rep_id == AERO_REP_ID_ && AERO_REP_ID_ != 0) {
    if (*update_type == UPDATE_GMD) {
      if (SECTION_TYPE_(*section_id) != MODAL) {
        printf(
            "\n\nERROR Trying to set geometric mean diameter for non-modal"
            " aerosol section.");
        exit(1);
      }
      GMD_(*section_id) = (double)*new_value;  // [m]
      ret_val = true;
    } else if (*update_type == UPDATE_GSD) {
      if (SECTION_TYPE_(*section_id) != MODAL) {
        printf(
            "\n\nERROR Trying to set geometric standard deviation for non-modal"
            " aerosol section.");
        exit(1);
      }
      GSD_(*section_id) = (double)*new_value;
      ret_val = true;
    }
  }
 
  if (ret_val == true) {
    /// Recalculate the effective radius [m]
    ///
    /// Equation based on \cite Zender2002
    /// Table 1 effective diameter \f$(D_s, D_{eff}\f$) equations:
    /// \f[
    /// \tilde{\sigma_g} \equiv ln( \sigma_g )
    /// \f]
    /// \f[
    /// D_s = D_{eff} = \tilde{D_n} e^{5 \tilde{\sigma}_g^2 / 2}
    /// \f]
    /// \f[
    /// r_{eff} = \frac{D_{eff}}{2}
    /// \f]
    /// where \f$\tilde{D_n}\f$ is the geometric mean diameter [m],
    /// \f$\sigma_g\f$
    /// is the geometric standard deviation [unitless], and \f$r_{eff}\f$
    /// is the effective radius [m].
    ///
    double ln_gsd = log(GSD_(*section_id));
    EFFECTIVE_RADIUS_(*section_id, 0) =
        GMD_(*section_id) / 2.0 * exp(5.0 * ln_gsd * ln_gsd / 2.0);
  }
 
  return ret_val;
}
 
/** \brief Print the mass-only modal/binned reaction parameters
 *
 * \param aero_rep_int_data Pointer to the aerosol representation integer data
 * \param aero_rep_float_data Pointer to the aerosol representation
 *                            floating-point data
 */
void aero_rep_modal_binned_mass_print(int *aero_rep_int_data,
                                      double *aero_rep_float_data) {
  int *int_data = aero_rep_int_data;
  double *float_data = aero_rep_float_data;
 
  printf("\n\nModal/binned mass-only aerosol representation\n");
 
  return;
}
 
/** \brief Create update data for new GMD
 *
 * \return Pointer to a new GMD update data object
 */
void *aero_rep_modal_binned_mass_create_gmd_update_data() {
  int *update_data = (int *)malloc(3 * sizeof(int) + sizeof(double));
  if (update_data == NULL) {
    printf("\n\nERROR allocating space for GMD update data.\n\n");
    exit(1);
  }
  return (void *)update_data;
}
 
/** \brief Set GMD update data
 *
 * \param update_data Pointer to an allocated GMD update data object
 * \param aero_rep_id Id of the aerosol representation(s) to update
 * \param section_id Id of the mode to update
 * \param gmd New mode GMD (m)
 */
void aero_rep_modal_binned_mass_set_gmd_update_data(void *update_data,
                                                    int aero_rep_id,
                                                    int section_id,
                                                    double gmd) {
  int *new_aero_rep_id = (int *)update_data;
  int *update_type = (int *)&(new_aero_rep_id[1]);
  int *new_section_id = (int *)&(update_type[1]);
  double *new_GMD = (double *)&(new_section_id[1]);
  *new_aero_rep_id = aero_rep_id;
  *update_type = UPDATE_GMD;
  *new_section_id = section_id;
  *new_GMD = gmd;
}
 
/** \brief Create update data for new GSD
 *
 * \return Pointer to a new GSD update data object
 */
void *aero_rep_modal_binned_mass_create_gsd_update_data() {
  int *update_data = (int *)malloc(3 * sizeof(int) + sizeof(double));
  if (update_data == NULL) {
    printf("\n\nERROR allocating space for GSD update data.\n\n");
    exit(1);
  }
  return (void *)update_data;
}
 
/** \brief Set GSD update data
 *
 * \param update_data Pointer to an allocated GSD update data object
 * \param aero_rep_id Id of the aerosol representation(s) to update
 * \param section_id Id of the mode to update
 * \param gsd New mode GSD (unitless)
 */
void aero_rep_modal_binned_mass_set_gsd_update_data(void *update_data,
                                                    int aero_rep_id,
                                                    int section_id,
                                                    double gsd) {
  int *new_aero_rep_id = (int *)update_data;
  int *update_type = (int *)&(new_aero_rep_id[1]);
  int *new_section_id = (int *)&(update_type[1]);
  double *new_GSD = (double *)&(new_section_id[1]);
  *new_aero_rep_id = aero_rep_id;
  *update_type = UPDATE_GSD;
  *new_section_id = section_id;
  *new_GSD = gsd;
}