ASCENT Site: Pittsburgh - Lawrenceville
Instrument: TSI Scanning Mobility Particle Sizer (SMPS) Model 3938
Data Level: Level 2. Delivered, validated data in native instrument resolution and standard atmospheric conditions.
Time Period: 2024-05-01 - 2024-05-31

ASCENT Data Policy
The ASCENT (Atmospheric Science and Chemistry mEasurement NeTwork) data are freely
 available to the public and the scientific community. Since these data are the product
 of extensive and continuous effort by the team to maintain ASCENT instrumentation and
 assure collection and processing of high quality data, we expect users of this data to
 ensure that the responsible ASCENT team members receive fair credit for their work, and
 are offered the opportunity to contribute to the data analysis and co-authored manuscripts,
 as appropriate. Note that co-authorship eligibility is not limited to writing sections of
 a paper but rather it encompasses the broader contribution to data collection and analysis.
 Early communication with ASCENT team members and individual site PIs (contact information
 available below) is expected to assure the quality and limitations of the data are accurately
 represented in the planned research.
When using these data in a publication or presentation, the National Science Foundation,
 Mid-scale Research Infrastructure (AGS 2131914), should be acknowledged. We suggest the following
 text be added to the acknowledgement section of publications:
 “The ASCENT data used in this work were supported by US NSF Mid-scale Research
 Infrastructure grant, AGS-2624916”.

Contacts
ASCENT PI: Nga Lee (Sally) Ng (ng@caltech.edu)
Site PI: Albert Presto (apresto@andrew.cmu.edu)

Site Information
ASCENT Site Code: Lawrenceville
ASCENT Site Number: 9
Coordinates: (-79.960757, 40.46542)
Elevation: 256 (m above mean sea level)
Time Zone: America/New_York (UTC -5)

ASCENT Data Processing Version
0.1.26


Data Processing Details
Data are reported without consideration of transmission efficiency (TE) in the sampling inlet. An estimate of TE has been calculated and is available upon request from the site PI.

Field Descriptions
site_number: ASCENT site number
site_code: ASCENT site code
sample_datetime_UTC: Datetime of sample start (UTC)
scan_number: Scan number
test_name: Name assigned to the scan
detector_status: Detector status provided by the instrument. ("Normal Scan" for nominal operation)
classifier_errors: Classifier errors provided by the instrument. ("Normal Scan" for nominal operation)
communication_status: Communication status (0 for nominal operation)
neutralizer_status: Neutralizer status
detector_inlet_flow_L_min: Detector inlet flow rate set point (L/min)
detector_counting_flow_L_min: Detector counting flow rate set point (L/min)
impactor_flow_L_min: Impactor flow rate set point (L/min)
impactor_d50_nm: Diameter at which 50% of particle will be removed by impactor (nm)
sheath_flow_L_min: Set point of the DMA sheath flow rate (L/min)
sheath_temp_degC: Sheath temperature (degrees C)
sheath_pressure_Pa: Sheath flow pressure (kPa)
sheath_relative_humidity_percent: Sheath flow relative humidity (%)
mean_free_path_m: Mean free path (m)
gas_viscosity_Pa-s: Gas viscosity (Pa*s)
low_voltage_V: Low voltage for scan (V)
high_voltage_V: High voltage for scan (V)
lower_size_nm: Lower limit of scan (nm)
upper_size_nm: Upper limit of scan (nm)
wide_range_scan_mode: Status of wide-range scan mode (1 indicates wide-range scan mode)
scan_direction: Scanning direction
hv_polarity: HV polarity
dma_v_ramping_up_s: Time for DMA voltage ramping up (s)
dma_v_ramping_down_s: Time for DMA voltage ramping down (s)
dma_column_transit_time_s: Time for DMA column transit (s)
dma_exit_to_optical_detector_s: Time for DMA exit to optical detector (s)
dma_at_low_voltage_s: Time for DMA at low voltage (s)
dma_at_high_voltage_s: Time for DMA at high voltage (s)
adjustment_s: Time adjustement factor (s)
dilution_factor: Dilution factor
aerosol_density_g_cm3: Assumed aerosol density (g/cm^3)
median_nm: Median number concentration particle size (nm)
mean_nm: Mean number concentration particle size (nm)
geo_mean_nm: Geometric mean number concentration particle size (nm)
mode_nm: Mode of number concentration particle size (nm)
geo_std_dev: Geometric standard deviation of number concentration particle size
total_concentration_1_cm3: Total number concentration of scan at sample conditions defined by temperature and pressure of the sheath flow (#/cm^3)
volume_concentration_um3_cm3: Total volume concentration of scan at sample conditions  defined by temperature and pressure of the sheath flow (μm^3/cm^3)
stp_factor: Multiplication conversion factor to standard temperature (0°C) and pressure (101325 Pa) from temperature and pressure measurements of the sheath flow
number_concentration_stp_1_cm3: Total number concentration of scan at standard conditions (#/cm^3)
volume_concentration_stp_um3_cm3: Total volume concentration of scan at standard conditions (μm^3/cm^3)
concentration_json: Concentration (dN/dlogDp) by size bin midpoint in JSON format at sample conditions (#/cm^3)
raw_concentration_json: Uncorrected concentration (dN/dlogDp) by size bin in JSON format at sample conditions (#/cm^3)
sample_analysis_id: An id that uniquely identifies this measurement in the respective table of the ASCENT database
site_record_id: An id that identifies this measurement in the respective table of the local site database
flag: Data quality flag(s) as defined by EBAS (ebas.nilu.no)
qc_outcome: An overall quality control outcome for this record (1-Good, 2-Not evaluated/Unknown, 3-Questionable, 4-Bad/Invalid, 9-Missing)
comment: Comments that provide more detail about any flags applied to the record

Instrument metadata
(Parameter: value    effective datetime (UTC))
AIM Version: 11.5.0    2023-05-10 11:54:39
Accessory: None    2023-05-10 11:54:39
Accessory S/N: N/A    2023-05-10 11:54:39
Calibration status: Last calibration > 365 days    2023-07-18 14:36:26
Channels/Decade: 128    2023-05-10 11:54:39
Classifier Firmware Version: 3.1    2023-05-10 11:54:39
Classifier HV Power Supply: Negative    2023-05-10 11:54:39
Classifier Model: 3082    2023-05-10 11:54:39
Classifier S/N: 3082002228001    2023-05-10 11:54:39
DMA Model: 3083    2023-05-10 11:54:39
DMA S/N: 30832231006    2023-05-10 11:54:39
Detector Calibration status: Last calibration < 365 days    2023-05-10 11:54:39
Detector Model: None    2024-01-31 15:56:45
Detector S/N: 3789222803    2023-05-10 11:54:39
Diffusion Loss Correction: true    2023-05-10 11:54:39
Dryer: N/A    2023-05-10 11:54:39
Effective Lengths (m) of components of the sampling system:     2023-05-10 11:54:39
Flow Rates (L/min) through the components of the sampling system:     2023-05-10 11:54:39
Flow Splitter: N/A    2023-05-10 11:54:39
Impactor Model: None    2023-05-10 11:54:39
Impactor S/N:     2023-05-10 11:54:39
Model 3789 D50: N/A    2024-01-31 15:56:45
Multiple Charge Correction: true    2023-05-10 11:54:39
Nano Enhancer: None    2023-05-10 11:54:39
Neutralizer Model: 3077    2023-05-10 11:54:39
Neutralizer S/N:     2023-05-10 11:54:39
PM2.5 Cyclone: N/A    2023-05-10 11:54:39
Primary Sampling Tube: N/A    2023-05-10 11:54:39
Reference Gas Pressure (kPa): 101.30    2023-05-10 11:54:39
Reference Gas Temperature (K): 296.15    2023-05-10 11:54:39
Reference Gas Viscosity (Pa*s): 1.832450e-5    2023-05-10 11:54:39
Reference Mean Free Path (m): 6.730000e-8    2023-05-10 11:54:39
Sampling System Particle Loss Correction: Off    2023-05-10 11:54:39
Secondary Sampling Tube: N/A    2023-05-10 11:54:39
Sutherland Constant (K): 110.40    2023-05-10 11:54:39
Tube Diameter (cm): 0.48    2023-05-10 11:54:39
Tube Length (cm): 86.00    2023-05-10 11:54:39
Tube Length (cm): 70.00    2024-05-22 13:45:16
Units: dW/dlogDp    2023-05-10 11:54:39
Weight: Number    2023-05-10 11:54:39
