ASCENT Site: Washington - Cheeka Peak
Instrument: Aerodyne Time-of-Flight Aerosol Chemical Speciation Monitor (TOF-ACSM)
Data Level: Level 2. Delivered, validated data in hourly resolution and standard atmospheric conditions.
Time Period: 2024-08-01 - 2024-08-31

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: Joel Thornton (joelt@uw.edu)

Site Information
ASCENT Site Code: CheekaPeak
ASCENT Site Number: 2
Coordinates: (-124.62491, 48.29786)
Elevation: 466 (m above mean sea level)
Time Zone: America/Los_Angeles (UTC -8)

ASCENT Data Processing Version
0.1.25


Data Processing Details
Data converted to ASCENT STP (0 C and 101325 Pa) assuming hydrostatic pressure (scale height of 7.4 km) and sampling temperature of 25 C.
 STP conversion factor for site =  1.154
Reported precisions for each species are the propagated uncertainties of Poisson's counting statistics of the corresponding open and closed spectra, as described in Ng et al. (AST, 2011) and Ulbrich et al. (ACP, 2009).
One set of IE/RIE values was used in 2023. Average IE/RIE values from 2 calibrations were used in 2024
CDCE output was used for periods suspected of acidic aerosol; for other periods CE=0.5

Field Descriptions
site_number: ASCENT site number
site_code: ASCENT site code
sample_datetime_UTC: Datetime of sample start (UTC)
sample_count: Number of observations in this hourly average
organics_STP_ug_m3: Organic aerosol concentration at STP (ug/m3)
sulfate_STP_ug_m3: Sulfate aerosol concentration at STP (ug/m3)
nitrate_STP_ug_m3: Nitrate aerosol concentration at STP (ug/m3)
ammonium_STP_ug_m3: Ammonium aerosol concentration at STP (ug/m3)
chloride_STP_ug_m3: Chloride aerosol concentration at STP (ug/m3)
organics_precision_STP_ug_m3: Organic aerosol counting precision (ug/m3)
sulfate_precision_STP_ug_m3: Sulfate aerosol counting precision (ug/m3)
nitrate_precision_STP_ug_m3: Nitrate aerosol counting precision (ug/m3)
ammonium_precision_STP_ug_m3: Ammonium aerosol counting precision (ug/m3)
chloride_precision_STP_ug_m3: Chloride aerosol counting precision (ug/m3)
org_mz29_STP_ug_m3: Organic aerosol ion fragment at m/z 29 mass concentration at STP (ug/m3)
org_mz43_STP_ug_m3: Organic aerosol ion fragment at m/z 43 mass concentration at STP (ug/m3)
org_mz44_STP_ug_m3: Organic aerosol ion fragment at m/z 44 mass concentration at STP (ug/m3)
org_mz55_STP_ug_m3: Organic aerosol ion fragment at m/z 55 mass concentration at STP (ug/m3)
org_mz57_STP_ug_m3: Organic aerosol ion fragment at m/z 57 mass concentration at STP (ug/m3)
org_mz60_STP_ug_m3: Organic aerosol ion fragment at m/z 60 mass concentration at STP (ug/m3)
org_mz69_STP_ug_m3: Organic aerosol ion fragment at m/z 69 mass concentration at STP (ug/m3)
org_mz71_STP_ug_m3: Organic aerosol ion fragment at m/z 71 mass concentration at STP (ug/m3)
org_mz73_STP_ug_m3: Organic aerosol ion fragment at m/z 73 mass concentration at STP (ug/m3)
no3_mz30_STP_ug_m3: Nitrate aerosol ion fragment at m/z 30 mass concentration at STP (ug/m3)
no3_mz46_STP_ug_m3: Nitrate aerosol ion fragment at m/z 46 mass concentration at STP (ug/m3)
hoa_STP_ug_m3: Hydrocarbon-like organic aerosol concentration estimated from poor-person's PMF at STP (ug/m3)
ooa_STP_ug_m3: Oxygenated organic aerosol concentration estimated from poor-person's PMF at STP (ug/m3)
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
