ASCENT Site: New York City - Queens College
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: 2022-12-01 - 2022-12-31

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: Drew Gentner (drew.gentner@yale.edu)

Site Information
ASCENT Site Code: QueensCollege
ASCENT Site Number: 10
Coordinates: (-73.82153, 40.73614)
Elevation: 25 (m above mean sea level)
Time Zone: America/New_York (UTC -5)

ASCENT Data Processing Version
0.1.25


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))
Calibration status: Last calibration < 365 days    2022-12-23 00:04:41
Classifier Firmware Version: 3.0    2022-12-23 00:04:41
Tube Length (cm): 41.30    2022-12-23 00:04:41
