Index of /arm-iop-file/2022/hou/tracer-pfm/petters-sp2

Name	Last modified	Size

Parent Directory		-
raw_data/	2024-05-30 14:07	-
bc_size_distributions/	2024-05-30 14:03	-

NCSU Black Carbon (SP2) Data

Overview:

NCSU SP2 Data

In ‘bc_size_distributions’ folder

Data Level b1: QC checks applied to measurements
Data Format: CSV
Description: See "instrument description
Site: Houston, TX; Tracking Aerosol Convection interactions ExpeRiment (HOU)
Location: Houston, TX; AMF1 (main site for TRACER)
Facility Code: M1
Category: Aerosol Properties
Data Type: PI Data
Source Instrument/Data: Single Particle Soot Photometer (SP2)
Start Date: 2022-06-01
End Date: 2022-09-27
Contact PI: Markus Petters (mdpetter@ncsu.edu)
Funding Source: DOE ASR award US Department of Energy, Office of Science, Biological and Environment Research (grant no. DE-SC 0021074)

Instrument description

The SP2 was located in the temperature-controlled trailer adjacent to the NCSU Flux Tower to observe refractory black carbon (rBC) number concentration and mixing states of black carbon. The sample line brought aerosol inside the trailer at 4.5 L min-1, where it was distributed between 3 CPCs (TSI 3776c, Dc ~ 2.5 nm, TSI 3771, Dc ~10nm, and TSI 3772, Dc ~40 nm) with different size cuts, a printed particle optical spectrometer (POPS), and SP2. Please contact mdpetter@ncsu.edu for further information.

Raw Data

In ‘raw_data’ folder

This data is the raw data of the single particle soot photometer deployed during TRACER-PFM. More details about the campaign and instrument setup are provided in Petters et al. (2024, Petters, M. D., Pujiastuti, T., Rasheeda Satheesh, A., Kasparoglu, S., Sutherland, B., and Meskhidze, N.: Wind-driven emissions of coarse-mode particles in an urban environment, Atmos. Chem. Phys., 24, 745–762, https://doi.org/10.5194/acp-24-745-2024, 2024.). Detailed analysis of these SP2 data is presented in Kasparoglu et al. (2024, Evolution of refractory black carbon mixing state in an urban environment, Atmospheric Environment, under review).

Metadata Creator:

Name: Markus D Petters
Email: markus_petters@ncsu.edu	Phone: (919) 515-7144
Street: Campus Box 8208	City: Raleigh
State: NC	Postal: 27695

Contact Info:

Name: Markus D Petters
Email: markus_petters@ncsu.edu	Phone: (919) 515-7144
Street: Campus Box 8208	City: Raleigh
State: NC	Postal: 27695

Investigator(s):

Sabin Kasparoglu (skaspar@ncsu.edu) 0000-0003-1924-0920
Nicholas Meskhidze (nmeskhi@ncsu.edu) 0000-0001-5628-8777
Markus Petters (markus_petters@ncsu.edu) 0000-0002-4082-1693

Related Publications/References:

Petters, M. D., Pujiastuti, T., Rasheeda Satheesh, A., Kasparoglu, S., Sutherland, B., and Meskhidze, N.: Wind-driven emissions of coarse-mode particles in an urban environment, Atmos. Chem. Phys., 24, 745–762, https://doi.org/10.5194/acp-24-745-2024, 2024.

Data Citation:

https://doi.org/10.5439/1974889

Data Format:

bc_size_distributions - csv; raw_data - Manufacturer Binary format

Data Volume:

2TB

File Naming Convention:

bc_size_distribution - ARM: hou1ncsusp2M1.b1

Directory Organization:

bc_size_distributions - single directory daily data files; raw_data - date directorties contain binary .sp2 files, hk directory contains housekeeping data files, and flags.csv contains data quality flags.

Abstract:

NCSU SP2 Data

In ‘bc_size_distributions’ folder

Instrument description

Raw Data

In ‘raw_data’ folder

Purpose:

BC Size Distributions Data

The purpose of the data is to characterize the black carbon size distribution. The data here are in addition to those reported in ARM record 0773, which reports the high time resolution number concentration data along the other aerosol instruments. The dataset here contains 16-bin rBC size distributiution and 16-bin optical size distribution, and reports the fraction of thinly and thickly coated particles. From this the rBC mass concentration and rBC size distribution dynamics can be determined.

Quality assurance and quality control

SP2 merged files were produced from the binary file format which stored single particle information. The data was put at regularly gridded 16-size bin channels. The black carbon concentration data and diagnostic files were generated by the SP2 manufacturer logged time at UTC. Only days without malfunction are reported. Maintenance time was not excluded from merged.csv files, but removed from NCSU tower data (ARM record 0773). An example of a malfunction day is when the sample flow rate was low (<< 0.12 L min-1). Example of suspicious day was when SP2 purely scattering particle concentrations were lower than that of printed optical particle concentrations.

Raw Data

This dataset contains the binary raw data files produced by the single particle soot photometer deployed by team Petters and Meskhidze. Further details about the SP2 instrument and the binary format can be found in Sedlacek, 2017 (Single-Particle Soot Photometer (SP2) Instrument Handbook) DOE/SC-ARM-TR-169 and the manufacturer manual.

Data Usage:

For bc_size_distributions data - Please see the header file for details about each channel, including size calibrations. For raw_data - These data require detailed processing. The PySP2 tool hosted on the DOE-ARM GitHub site is an excellent starting point (https://github.com/ARM-DOE/PySP2). The .sp2 binary files are given for each date in a separate folder. They contain pulse traces for all detectors and each single particle transit event. Housekeeping files, including flow rates and laser power are given in the hk folder. The file "flags.csv" contains flags for all instruments deployed by the team. Flag = 0 means acceptable data. Flag = 1 means questionable data due to instrument maintenance or other issues. Additional screening may be required. While all data are uploaded for complete archiving, data between 7/1/2023 and 7/17/2023, 8/1/2023 and 8/15/2023 and 9/8/2023 and 9/25/2023 are deemed acceptable for scientific use. Additional screening based on sample flow rate and flags is needed. Calibration between scattering pulse height and particle size is given by Ax = [1.827476963340118, 0.18452139218117997] and Dp = exp10(Ax[1] + Ax[2] * log10(ph), where ph is the pulse height of the peak detected by the low gain scattering detector. The calibration is based on mobility-selected ammonium sulfate. Calibration between incandescence pulse height and black carbon core diameter is given by Ax = [0.06223469771390533, 0.00024070120274651756] and rBCDp = Ax[1] + Ax[2] * ph, where ph is the pulse height detected by the high gain broadband incandescence detector. The calibration is based on mobility-selected dried aquadaq.

Data Credit:

DOE Office of Science, Biological and Environment Research, Grant No. DE-SC0021074

Arm Sites:

hou

Content Time Range:

Begin: 2022-06-01 End: 2022-09-27

Instrument(s):

Single Particle Soot Photometer

Data Type:

Particle Flux Measurements during TRACER

Scientific Measurements(s):

Measurement name	Variables
Refractory black carbon size distribution

Stratum Keyword(s):

Atmosphere: Surface

Data Quality:

Attribute Accuracy:	No formal uncertainty assessments were conducted and no estimates of uncertainty are reported.
Positional Accuracy:	No formal positional accuracy tests were conducted
Consistency and Completeness Report:	Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.

Use Restrictions:

No use constraints are associated with this data.

Distribution Info:

Organization Name:	ARM Archive User Services
Email: armarchive[at]ornl.gov	Phone: 1-888-ARM-DATA
Street: Oak Ridge National Laboratory	City: Oak Ridge
State: Tennessee	Postal: 37831-6290