AWR/CCN/CPC/M1 - Concentration difference

Various tests performed to understand why the CCN counts sometimes exceed those of a 
co-located CPC. Instrument functioning normally, but occasionally sampling cabin air during 
this period or running with internal flow lines opened for flow measurements.

Use data with caution

• Condensation temperature(condensation_temp)
• Flow setpoint(dilution_flow_setpoint)
• Dilution flow valve position(dilution_valve_position)
• OPC laser current(laser_current)
• Liquid fraction available(fraction_full)
• Aerosol concentration averaged over times to match N_CCN(concentration)
• Liquid level(liquid_level)
• Nozzle pressure(nozzle_pressure)
• Optics temperature(optics_temp)
• Saturation temperature(saturation_temp)
• Cabinet temperature(cabinet_temp)
• Orifice pressure(orifice_pressure)
• Ambient pressure(ambient_pressure)
• Flow read(dilution_flow_reading)

• Optics temperature(optics_temp)
• Liquid fraction available(fraction_full)
• Flow read(dilution_flow_reading)
• Cabinet temperature(cabinet_temp)
• Dilution flow valve position(dilution_valve_position)
• Ambient pressure(ambient_pressure)
• Saturation temperature(saturation_temp)
• Aerosol concentration averaged over times to match N_CCN(concentration)
• Nozzle pressure(nozzle_pressure)
• OPC laser current(laser_current)
• Orifice pressure(orifice_pressure)
• Dilution slope(dilution_slope)
• Condensation temperature(condensation_temp)
• Calibrated aerosol flow as supplied by mentor(aerosol_flow_calibrated)
• Dilution correction factor(dilution_correction_factor)
• Liquid level(liquid_level)
• Flow setpoint(dilution_flow_setpoint)
• Dilution intercept(dilution_intercept)

• AOS CCN set temperature for the Nafion humidifier(CCN_T_nafion_set)
• AOS CCN OPC laser current(CCN_laser_current)
• AOS CCN (read) temperature at bottom of column(CCN_T_read_TEC3)
• AOS CCN voltage used by DMT for OPC diagnostic purposes(CCN_baseline_monitor)
• CCN alarm code expressed as a summation of powers of 2. 0 indicates no detected
  problem(CCN_alarm_code)
• AOS CCN temperature of sample air at entrance to instrument(CCN_T_inlet)
• AOS CCN temperature of the optical particle counter(CCN_T_OPC)
• Number of particles that are larger than 10um(CCN_overflow)
• AOS CCN sample saturation setpoint value reported by instrument(CCN_ss_set)
• Cloud condensation nuclei number density(N_CCN)
• Temperature difference between CCN_t_set_TEC3 and CCN_t_set_TEC1(CCN_temperature_gradient)
• AOS CCN sample supersaturation set point value reported by instrument(CCN_supersaturation_set_point)
• AOS CCN volumetric flowrate of sheath air(CCN_Q_sheath)
• AOS CCN observed temperature at middle of column(CCN_T_read_TEC2)
• AOS CCN observed temperature at top of column(CCN_T_read_TEC1)
• AOS CCN super saturation (calculated)(CCN_super_saturation_calculated)
• AOS CCN set point temperature for the inlet manifold(CCN_T_inlet_set)
• AOS CCN (read) temperature at bottom of column(CCN_t_read_TEC3)
• AOS CCN number concentration by bin(N_CCN_dN)
• AOS CCN observed temperature at middle of column(CCN_t_read_TEC2)
• AOS CCN observed temperature at top of column(CCN_t_read_TEC1)
• AOS CCN logical value, indicating whether the instrument has reached thermal
  gradient stabilization and is within 0.4 degrees C of the set point(CCN_temp_unstable_flag)
• First stage monitor voltage(CCN_first_stage_monitor_voltage)
• CCN Proportional valve voltage(CCN_proportional_valve_voltage)
• AOS CCN set point for temperature at bottom of column(CCN_T_set_TEC3)
• AOS CCN temperature of sample air entering the column(CCN_T_sample)
• AOS CCN set point for temperature at top of column(CCN_T_set_TEC1)
• AOS CCN set point for temperature at middle of column(CCN_T_set_TEC2)
• AOS CCN sample pressure(CCN_P_sample)
• AOS CCN volumetric flowrate of sample air(CCN_Q_sample)
• Standard deviation of CCN temperature gradient (CCN_t_read_TEC3 -
  CCN_t_read_TEC1)(CCN_temperature_std)
• Size bins for CCN droplet count(size_bin)
• AOS CCN logical value, indicating whether the instrument has reached thermal
  gradient stabilization and is within 0.4 degrees C of the set point(CCN_temp_unstable)
• AOS CCN temperature of the nafion humidifier(CCN_T_nafion)
• AOS CCN set point temperature for the optical particle counter (OPC)(CCN_OPC_set)
• Bin number of lowest channel of OPC include in summation of N_CCN(N_CCN_bin_number)

• Size bins for CCN droplet count(size_bin)
• T_OPC - T_read_TEC3 temperature difference(dT_OPC)
• AOS CCN number concentration by bin(N_CCN_dN)
• Estimated target thermal gradient under current operating conditions(dT_target_estimated)
• Temperature read at bottom of column(T_read_TEC3)
• Number of particles that are larger than 10um(overflow)
• Temperature read at top of column(T_read_TEC1)
• Temperature read at middle of column(T_read_TEC2)
• Reported temperature difference between T_set_TEC3 and T_set_TEC1(reported_temperature_gradient)
• Temperature difference between T_set_TEC3 and T_set_TEC1(T_set_gradient)
• OPC laser current(laser_current)
• Cloud condensation nuclei number density(N_CCN)
• seconds since last impactor transition(seconds_after_transition)
• CCN Proportional valve voltage(proportional_valve_voltage)
• Logical value, indicating whether the instrument has reached thermal gradient
  stabilization and is within 0.4 degrees C of the set point(temp_unstable)
• Temperature read of sample air at entrance to instrument(T_inlet)
• Temperature set point at bottom of column(T_set_TEC3)
• Bin number of lowest channel of OPC include in summation of N_CCN(N_CCN_bin_number)
• Temperature read of the optical particle counter(T_OPC)
• Sample supersaturation set point value reported by instrument(supersaturation_set_point)
• First stage monitor voltage(first_stage_monitor_voltage)
• Droplet bin bounds(size_bin_bounds)
• Standard deviation of (T_read_TEC3 - T_read_TEC1)(temperature_std)
• Nafion temperature(T_nafion)
• Temperature set point at middle of column(T_set_TEC2)
• Temperature set point at top of column(T_set_TEC1)
• Volumetric flow rate of sheath air(Q_sheath)
• Eta factor used in calculation of supersaturation_calculated(eta)
• Sample pressure(P_sample)
• Temperature read of sample air entering the column(T_sample)
• Temperature difference between T_read_TEC3 and T_read_TEC1(T_read_gradient)
• Sample supersaturation calculated via Lance/Rose method(supersaturation_calculated)
• Target supersaturation calculated via Lance/Rose method, computed from
  eta_target(supersaturation_calculated_target)
• Eta factor used in calculation of
  supersaturation_calculated_estimated_equilibrium_target(eta_target)
• Volumetric flow rate of sample air(Q_sample)
• Lookup table for eta computation(eta_lookup_table)