ASCENT Site: Alaska - Delta Junction
Instrument: TSI Scanning Mobility Particle Sizer (SMPS) Model 3938
Data Level: Level 2. Delivered, validated data in hourly resolution and standard atmospheric conditions.
Time Period: 2024-10-01 - 2024-10-31

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 2131914”.

Contacts
ASCENT PI: Nga Lee (Sally) Ng (ng@caltech.edu)
Site PI: Jingqiu Mao (jmao2@alaska.edu)

Site Information
ASCENT Site Code: DeltaJunction
ASCENT Site Number: 1
Coordinates: (-145.75136, 63.88112)
Elevation: 529 (m above mean sea level)
Time Zone: America/Anchorage (UTC -9)

ASCENT Data Processing Version
0.1.23


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)
stp_factor: Multiplication conversion factor to standard temperature (0°C) and pressure (101325 Pa) from temperature and pressure measurements of the sheath flow
qc_outcome: An overall quality control outcome for this record (1-Good, 2-Not evaluated/Unknown, 3-Questionable, 4-Bad/Invalid, 9-Missing)
flag: Data quality flag(s) as defined by EBAS (ebas.nilu.no)
comment: Comments that provide more detail about any flags applied to the record
sample_count: Number of scans in this hourly average
total_concentration_1_cm3: Total mean hourly number concentration at sample conditions (#/cm^3)
volume_concentration_um3_cm3: Total mean hourly volume concentration at sample conditions (μm^3/cm^3)
mean_nm: Mean number concentration particle size (nm)
geo_mean_nm: Geometric mean number concentration particle size (nm)
median_nm: Median 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
number_concentration_stp_1_cm3: Total hourly mean number concentration at standard conditions (#/cm^3)
volume_concentration_stp_um3_cm3: Total hourly mean volume concentration at standard conditions (μm^3/cm^3)
concentration_json: Mean hourly concentration (dN/dlogDp) by size bin midpoint in JSON format at sample conditions (#/cm^3)

Instrument metadata
(Parameter: value    effective datetime (UTC))
AIM Version: 11.5.0    2024-10-10 00:00:07
Accessory: None    2024-10-10 00:00:07
Accessory S/N: N/A    2024-10-10 00:00:07
Calibration status: Last calibration > 365 days    2024-10-10 00:00:07
Channels/Decade: 64    2023-07-11 00:03:45
Classifier Firmware Version: 3.1    2024-10-10 00:00:07
Classifier HV Power Supply: Negative    2024-10-10 00:00:07
Classifier Model: 3082    2024-10-10 00:00:07
Classifier S/N: 3082002227008    2024-10-10 00:00:07
DMA Model: 3083    2024-10-10 00:00:07
DMA S/N: 30832231001    2024-10-10 00:00:07
Detector Calibration status: Last calibration < 365 days    2024-10-10 00:00:07
Detector Model: 3789    2024-10-10 00:00:07
Detector S/N: 3789222703    2024-10-10 00:00:07
Diffusion Loss Correction: true    2023-07-11 16:19:13
Dryer: N/A    2024-10-10 00:00:07
Effective Lengths (m) of components of the sampling system:     2024-10-10 00:00:07
Flow Rates (L/min) through the components of the sampling system:     2024-10-10 00:00:07
Flow Splitter: N/A    2024-10-10 00:00:07
Impactor Model: None    2024-10-10 00:00:07
Impactor S/N:     2024-10-10 00:00:07
Model 3789 D50: undefined    2024-10-09 15:09:47
Model 3789 D50: 2nm    2024-10-10 00:00:07
Multiple Charge Correction: true    2023-07-11 16:19:13
Nano Enhancer: None    2024-10-10 00:00:07
Neutralizer Model: 3077    2024-10-10 00:00:07
Neutralizer S/N:     2024-10-10 00:00:07
PM2.5 Cyclone: N/A    2024-10-10 00:00:07
Primary Sampling Tube: N/A    2024-10-10 00:00:07
Reference Gas Pressure (kPa): 101.30    2024-10-10 00:00:07
Reference Gas Temperature (K): 296.15    2024-10-10 00:00:07
Reference Gas Viscosity (Pa*s): 1.832450e-5    2024-10-10 00:00:07
Reference Mean Free Path (m): 6.730000e-8    2024-10-10 00:00:07
Sampling System Particle Loss Correction: Off    2024-10-10 00:00:07
Secondary Sampling Tube: N/A    2024-10-10 00:00:07
Sutherland Constant (K): 110.40    2024-10-10 00:00:07
Tube Diameter (cm): 0.48    2024-10-10 00:00:07
Tube Length (cm): 38.10    2023-07-11 16:19:13
Tube Length (cm): 39.50    2024-10-10 00:00:07
Units: dW/dlogDp    2024-10-10 00:00:07
Weight: Number    2024-10-10 00:00:07
