# Datastream : AOSCCN200

AOS: Dual Column Cloud Condensation Nuclei Counter

**Active Dates**

2012.06.24 - 2013.03.10

**Measurement Categories**

Aerosols, Cloud Properties

**Originating Instrument**

Aerosol Observing System (AOS)

## Measurements

Only measurements considered **scientifically relevant** are shown below *by default*.

Show all measurements

Measurement | Units | Variable |
---|---|---|

AOS CCN set point temperature for the optical particle counter (OPC), first column | degrees C | CCN_OPC_set_1 ( time ) |

AOS CCN set point temperature for the optical partical counter (OPC), second CCN | degrees C | CCN_OPC_set_2 ( time ) |

AOS CCN sample pressure, first column | hPa | CCN_P_sample_1 ( time ) |

AOS CCN sample pressure, second CCN | hPa | CCN_P_sample_2 ( time ) |

AOS CCN volumetric flowrate of sample air, first CCN | cm^3/minute | CCN_Q_sample_1 ( time ) |

AOS CCN volumetric flowrate of sample air, second CCN | cm^3/min | CCN_Q_sample_2 ( time ) |

AOS CCN volumetric flowrate of sheath air, first CCN | cm^3/minute | CCN_Q_sheath_1 ( time ) |

AOS CCN volumetric flow rate of sheath air, second column | cm^3/minute | CCN_Q_sheath_2 ( time ) |

AOS CCN temperature of the optical particle counter, first CCN | degC | CCN_T_OPC_1 ( time ) |

AOS CCN temperature of the optical particle counter, second CCN | degC | CCN_T_OPC_2 ( time ) |

AOS CCN temperature of sample air at entrance to instrument, first CCN | degC | CCN_T_inlet_1 ( time ) |

AOS CCN set point temperature for the inlet manifold, second column | degC | CCN_T_inlet_2 ( time ) |

AOS CCN set point temperature for the inlet manifold, first column | degC | CCN_T_inlet_set_1 ( time ) |

AOS CCN temperature of sample air at entrance to instrument, second column | degC | CCN_T_inlet_set_2 ( time ) |

AOS CCN Nafion temperature, first column | degC | CCN_T_nafion_1 ( time ) |

AOS CCN Nafion temperature, second column | degrees C | CCN_T_nafion_2 ( time ) |

AOS CCN set temperature for the Nafion humidifier, first column | degC | CCN_T_nafion_set_1 ( time ) |

AOS CCN set temperature for the Nafion humidifier, second column | degC | CCN_T_nafion_set_2 ( time ) |

AOS CCN observed temperature at top of column, first CCN | degC | CCN_T_read_TEC1_1 ( time ) |

AOS CCN observed temperature at top of column, second column | degrees C | CCN_T_read_TEC1_2 ( time ) |

AOS CCN observed temperature at middle of column, first CCN | degrees C | CCN_T_read_TEC2_1 ( time ) |

AOS CCN observed temperature at middle of column, second column | degrees C | CCN_T_read_TEC2_2 ( time ) |

AOS CCN (read) temperature at bottom of column, first CCN | degC | CCN_T_read_TEC3_1 ( time ) |

AOS CCN (read) temperature at bottom of column, second column | degC | CCN_T_read_TEC3_2 ( time ) |

AOS CCN temperature of sample air entering the column, first CCN | degrees C | CCN_T_sample_1 ( time ) |

AOS CCN temperature of sample air entering the column, second CCN | degC | CCN_T_sample_2 ( time ) |

AOS CCN set point for temperature at top of column, first CCN | degrees C | CCN_T_set_TEC1_1 ( time ) |

AOS CCN set point for temperature at top of column, second column | degC | CCN_T_set_TEC1_2 ( time ) |

AOS CCN set point for temperature at middle of column, first CCN | degrees C | CCN_T_set_TEC2_1 ( time ) |

AOS CCN set point for temperature at middle of column, second CCN | degC | CCN_T_set_TEC2_2 ( time ) |

AOS CCN set point for temperature at bottom of column, first CCN | degC | CCN_T_set_TEC3_1 ( time ) |

AOS CCN set point for temperature at bottom of column, second column | degC | CCN_T_set_TEC3_2 ( time ) |

CCN alarm code expressed as a summation of powers of 2. 0 indicates no detected problem | unitless | CCN_alarm_code ( time ) |

CCN alarm code expressed as a summation of powers of 2. 0 indicates no detected problem, first column | unitless | CCN_alarm_code_1 ( time ) |

CCN alarm code expressed as a summation of powers of 2. 0 indicates no detected problem, second column | unitless | CCN_alarm_code_2 ( time ) |

AOS CCN voltage used by DMT for OPC diagnostic purposes, first column | volt | CCN_baseline_monitor_1 ( time ) |

AOS CCN voltage used by DMT for OPC diagnostic purposes, second column | volt | CCN_baseline_monitor_2 ( time ) |

First stage monitor voltage, first column | V) | CCN_first_stage_monitor_voltage_1 ( time ) |

First stage monitor voltage, second column | V | CCN_first_stage_monitor_voltage_2 ( time ) |

AOS CCN set point temperature for the inlet manifold, first CCN | degrees C | CCN_inlet_set_1 ( time ) |

AOS CCN set point temperature for the inlet manifold, second CCN | degrees C | CCN_inlet_set_2 ( time ) |

AOS CCN OPC laser current, first column | mA | CCN_laser_current_1 ( time ) |

AOS CCN OPC laser current, second column | mA | CCN_laser_current_2 ( time ) |

AOS CCN set temperature for the Nafion humidifier, first CCN | degC | CCN_nafion_set_1 ( time ) |

AOS CCN set temperature for the Nafion humidifier, second CCN | degC | CCN_nafion_set_2 ( time ) |

Number of particles that are larger than 10um, first column | count | CCN_overflow_1 ( time ) |

Number of particles that are larger than 10um, second column | count | CCN_overflow_2 ( time ) |

CCN Proportional valve voltage, first column | V | CCN_proportional_valve_voltage_1 ( time ) |

CCN Proportional valve voltage, second column | V | CCN_proportional_valve_voltage_2 ( time ) |

AOS CCN sample saturation setpoint value reported by instrument, first CCN | % | CCN_ss_set_1 ( time ) |

AOS CCN sample saturation setpoint value reported by instrument, second CCN | % | CCN_ss_set_2 ( time ) |

AOS CCN sample supersaturation set point value reported by instrument, first column | % | CCN_supersaturation_set_point_1 ( time ) |

AOS CCN sample supersaturation set point value reported by instrument, second column | % | CCN_supersaturation_set_point_2 ( time ) |

AOS CCN logical value, indicating whether the instrument has reached thermal gradient stabilization and is within 0.4 degrees C of the set point, first column | unitless | CCN_temp_unstable_1 ( time ) |

AOS CCN logical value, indicating whether the instrument has reached thermal gradient stabilization and is within 0.4 degrees C of the set point, second column | unitless | CCN_temp_unstable_2 ( time ) |

Hexadecimal flag, non-zero value means instrument is not operating stably, first CCN | unitless | CCN_temp_unstable_flag_1 ( time ) |

Hexadecimal flag, non-zero value means instrument is not operating stably, second CCN | unitless | CCN_temp_unstable_flag_2 ( time ) |

Temperature difference between CCN_T_set_TEC3_1 and CCN_T_set_TEC1_1, first column | degC | CCN_temperature_gradient_1 ( time ) |

CCN temperature gradient, second CCN | degC | CCN_temperature_gradient_2 ( time ) |

Size of upper limit of each CCN bin | um | CCN_upper_size_limit ( num_bins ) |

AOS number concentration of CCN, first column | 1/cm^3 | N_CCN_1 ( time ) |

AOS number concentration of CCN, second column | 1/cm^3 | N_CCN_2 ( time ) |

AOS bin number of lowest channel of OPC include in summation of N_CCN, first CCN | unitless | N_CCN_bin_number_1 ( time ) |

AOS bin number of lowest channel of OPC include in summation of N_CCN, second CCN | unitless | N_CCN_bin_number_2 ( time ) |

AOS CCN droplet count by bin size, first column | count/s | N_CCN_dN_1 ( time, num_bins ) |

AOS CCN droplet count by bin size, second column | count/s | N_CCN_dN_2 ( time, num_bins ) |

Altitude above mean sea level | m | alt |

Base time in Epoch | seconds since 1970-1-1 0:00:00 0:00 | base_time |

North latitude | degree_N | lat |

East longitude | degree_E | lon |

Size bins for CCN droplet count | um | size_bin ( size_bin ) |

Droplet bin bounds | size_bin_bounds ( size_bin, bound ) | |

Time offset from midnight | time ( time ) | |

Time offset from base_time | time_offset ( time ) |

## Locations

ARM Mobile Facility | |||||

PVC | S1 | Browse Data | Browse Plots | Highland Center, Cape Cod MA; MAOS | retired |

retired = Originating instrument has been retired at this location