ASCENT Site: Alaska - Delta Junction
Instrument: Magee Aethalometer Model AE33
Data Level: Level 1b. Preliminary, unvalidated data in native time resolution as acquired in real time with automated quality control checks applied.
Time Period: 2023-11-01 - 2023-11-30

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
0.1.19

Channel #, Measurement wavelength (nm), Mass absorption cross-section (m2/g):
1, 370, 18.47
2, 470, 14.54
3, 520, 13.14
4, 590, 11.58
5, 660, 10.35
6, 880, 7.77
7, 950, 7.19
Data Processing Details
Data are obtained with C = 1.39, Zeta = 0.01, corresponding to tape model 8060.

Field Descriptions
site_number: ASCENT site number
site_code: ASCENT site code
sample_datetime_UTC: Datetime of sample end (UTC)
status: Overall instrument status code (sum of all decimal values of the status flags)
cont_status: Controller status (0 – ready for operation; 100 – reset detected, not ready for operation; 255 – busy)
detect_status: Detector status
led_status: LED status (0 – Led driver initialization ERROR; 10 – Led driver OK)
valve_status: (0 - measurement; 10 - flowmeter calibration; 1100 - warm-up/clean air; 1011 - bypass)
cont_temp_degC: Control temperature (degrees C)
supply_temp_degC: Power supply board temperature (degrees C)
pressure_Pa: Reference pressure used to convert to volumetric flow (Pa)
temperature_degC: Reference temperature used to convert to volumetric flow (degrees C)
flow1_L_min: Measured flow through spot 1 (L/min)
flow2_L_min: Measured flow through spot 2 (L/min)
flowc_L_min: Common (total) flow through the optical chamber (L/min)
tape_adv_count: Number of tape advances since start
ref_[n]: Raw signal reference for channel [n]
sens1_[n]: Raw signal at sensing spot 1 for channel [n]
sens2_[n]: Raw signal at sensing spot 2 for channel [n]
bc_[n]_STP_ng_m3: Calculated BC from measurements for channel [n] at standard temperature (0 C) and pressure (101325 Pa) (ng/m3)
bc1_[n]_STP_ng_m3: Uncompensated BC calculated from spot 1 for channel [n] at standard temperature and pressure (ng/m3)
bc2_[n]_STP_ng_m3: Uncompensated BC calculated from spot 2 for channel [n] at standard temperature and pressure (ng/m3)
k_[n]: Compensation parameter for channel [n]
bb_percent: Percentage of BC created by biomass burning, determined by Sandradewi model (ES&T, 2008)
att1_[n]: Attenuation at sensing spot 1 for channel [n]
att2_[n]: Attenuation at sensing spot 2 for channel [n]
sample_analysis_id: An id that uniquely identifies this measurement in the respective table of the ASCENT database. Currently empty for AE33 data.
site_record_id: An id that identifies this measurement in the respective table of the local site database. Currently empty for AE33 data.
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
