ASCENT Site: New York City - Queens College
Instrument: Aerodyne Time-of-Flight Aerosol Chemical Speciation Monitor (TOF-ACSM)
Data Level: Level 1b. Preliminary, unvalidated data in native time resolution as acquired in real time with automated quality control checks applied.
Time Period: 2025-05-01 - 2025-05-31

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 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
0.1.23


Field Descriptions
sample_analysis_id: An id that uniquely identifies this measurement in the respective table of the ASCENT database
status: General status flag
sample_datetime_UTC: Datetime of sample start (UTC)
sample_datetime_end_UTC: End time of sample (UTC)
site_record_id: An id that identifies this measurement in the respective table of the local site database
site_number: ASCENT site number
site_code: ASCENT site code
chl_ug_m3: Chloride difference signal (ug/m3)
nh4_ug_m3: Ammonium difference signal (ug/m3)
no3_ug_m3: Nitrate difference signal (ug/m3)
org_ug_m3: Organic difference signal (ug/m3)
so4_ug_m3: Sulfate difference signal (ug/m3)
rie_chl: Relative ionization efficiency for chloride
rie_nh4: Relative ionization efficiency for ammonium
rie_no3: Relative ionization efficiency for nitrate
rie_org: Relative ionization efficiency for organics
rie_so4: Relative ionization efficiency for sulfate
f43: Integrated difference signal at 43 Th as fraction of total organic
f44: Integrated difference signal at 44 Th as fraction of total organic
f57: Integrated difference signal at 57 Th as fraction of total organic
f60: Integrated difference signal at 60 Th as fraction of total organic
hoa_ug_m3: Poor-person's PMF for HOA (ug/m3)
ooa_ug_m3: Poor-person's PMF for OOA (ug/m3)
ce: Collection efficiency value used in calculating loadings
flow_cm3_s: Calibration value (ions/pg)
abref_ions_s: Calibration airbeam reference (ions/s)
ab_total_ions_s: Average airbeam during total measurement (ions/s)
ab_bg_ions_s: Average airbeam during background measurement (ions/s)
ie_ions_pg: Flowrate as calculated from inlet pressure (cm3/s)
flow_p0: Flowrate calibration offset
flow_p1: Flowrate calibration slope
n_total: # MS in total average
n_bkgd: # MS in background average
baseline: DAQ baseline code
threshold: DAQ threshold code
mzcal_p1: Mass calibration p1
mzcal_p2: Mass calibration p0
ratio40div28: Ratio of integrated signal at 40 Th to 28 Th
rbp_V: Reflector backplane voltage (V)
rg_V: Reflector grid voltage (V)
lens_V: Lens voltage (V)
detector_V: Detector voltage (V)
hv_spare_V: Spare HV voltage (V)
pulser_V: Pulser voltage (V)
lens2_V: Lens 2 voltage (V)
defl_V: Deflector voltage (V)
defl_flange_V: Deflector flange voltage (V)
ionex_V: Ion extractor voltage (V)
lens1_V: Lens 1 voltage (V)
hb_V: Heater bias voltage (V)
ionchamber_V: Ion chamber voltage (V)
fore_percent: Filament voltage (V)
filament_emm_A: Filament emission current (A)
filament_i_A: Filament supply current (A)
filament_n: Filament number in use (1 or 2)
interlock: Interlock active
hvp_V: HV positive supply voltage (V)
hvn_V: HV negative supply voltage (V)
turbo_speed_Hz: Turbo rotation frequency (Hz)
turbo_power_W: Turbo power consumption (W)
heater_V: Forepump rotation as percentage of full (percent)
tps_temp_degC: Temperature in TPS (degC)
press_ioniser_Pa: Pressure in ioniser (Pa)
press_inlet_Pa: Pressure in inlet (Pa)
ain_3_V: Analog input channel 3 (V)
ain_4_V: Analog input channel 4 (V)
ain_5_V: Analog input channel 5 (V)
ain_6_V: Analog input channel 6 (V)
heater_pwm: Heater PWM setpoint
heater_i_A: Heater current (A)
filament_V: Heater voltage (V)
heater_t_degC: Heater temperature (degC)
servo2_pwm: Inlet servo position
servo3_pwm: Filter servo position
qc_outcome: A quality control outcome 1-Good, 2-Not evaluated/unknown, 3-Questionable/suspect, 4-Bad/Invalid, 9-Missing
flag: Data quality flag(s) as defined by EBAS (ebas.nilu.no)
comment: Comment describing flagging details
