Index of /arm-iop-file/2022/hou/tracer-cat-ucdavis/cappa-crdps

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TRACER-CAT-UCDAVIS Aerosol Optical Properties and Sizing - crdps

Overview:

Aerosol size distribution and optical properties collected in La Port TX, during TRACER-CAT-UCDavis, July 2022. Speciated particle composition measurements are reported separately. All sampling was conducted with an identical aerosol inlet as the standard ARM-AOS systems.

The TRacking Aerosol Convection interactions ExpeRiment Carbonaceous Aerosols Thrust by UC Davis (TRACER-CAT-UCDavis, July 2022) was designed to complement the larger ARM TRACER science goals to understand convective cloud lifecycles and aerosol-convection interactions. TRACER-CAT-UCDavis is focused on understanding the relationship between particle composition and light absorption and the influence of water uptake on this relationship.

This aerosol data can be used to understand the relationship between particle composition and light absorption and the influence of water uptake on this relationship.

Instruments include:

UC Davis two-wavelength cavity ringdown-photoacoustic spectrometer (CRD-PAS); Brechtel scanning electrical mobility sizer (SEMS); modified humidified cavity attenuated phase shift spectrometer with single scatter albedo (H-CAPS-SSA)

Metadata Creator:
Name: Chris Cappa
Email: cdcappa@ucdavis.edu Phone: (530) 752-8180
Street: 2001 Ghausi Hall, UC Davis, One Shields Ave. City: Davis
State: CA Postal: 95616
Contact Info:
Name: Chris Cappa
Email: cdcappa@ucdavis.edu Phone: (530) 752-8180
Street: 2001 Ghausi Hall, UC Davis, One Shields Ave. City: Davis
State: CA Postal: 95616
Investigator(s): Rachael DalPorto (rmdalporto@ucdavis.edu)
Zewen Zheng (zewzheng@ucdavis.edu)
Data Citation:https://doi.org/10.5439/1958804
Data Format:txt
File Naming Convention:UCD_InstrumentOrData_datalevel.txt
Abstract:

Aerosol size distribution and optical properties collected in La Port TX, during TRACER-CAT-UCDavis, July 2022. Speciated particle composition measurements are reported separately. All sampling was conducted with an identical aerosol inlet as the standard ARM-AOS systems.

The TRacking Aerosol Convection interactions ExpeRiment Carbonaceous Aerosols Thrust by UC Davis (TRACER-CAT-UCDavis, July 2022) was designed to complement the larger ARM TRACER science goals to understand convective cloud lifecycles and aerosol-convection interactions. TRACER-CAT-UCDavis is focused on understanding the relationship between particle composition and light absorption and the influence of water uptake on this relationship.

This aerosol data can be used to understand the relationship between particle composition and light absorption and the influence of water uptake on this relationship.

Instruments include:

UC Davis two-wavelength cavity ringdown-photoacoustic spectrometer (CRD-PAS); Brechtel scanning electrical mobility sizer (SEMS); modified humidified cavity attenuated phase shift spectrometer with single scatter albedo (H-CAPS-SSA)
Purpose:

The goal was to probe the relationship between particle composition and light absorption and the influence of water uptake on this relationship.
Data Usage:Data are reported as 5 minute averages. It is suggested that the absorption data from the CRD-PAS are averaged to 30 minutes for use. The H-CAPS-SSA data remain preliminary and should not be used; there were major challenges associated with the operation of this instrument in the high-humidity environment of Houston. Times reported are local times for July (central daylight time; UTC - 5h)
Data Credit:Los Alamos National Laboratory
Arm Sites: hou
Content Time Range: Begin: 2022-06-30 End: 2022-08-01
Instrument(s):Cavity Ring Down Extinction Spectrometer
Photoacoustic Soot Spectrometer
Data Type:TRACER-CAT-UCDavis
Scientific Measurements(s):
Measurement nameVariables
Aerosol extinction coefficient, 532 nm, dryBext532nm_Dry
Aerosol extinction coefficient, 532 nm, humidified to ~85% RHBext532nm_Wet
Aerosol extinction coefficient, 405 nm, dryBext405nm
Aerosol absorption coefficient, 532 nm, dryBabs532nm
Aerosol absorption coefficient, 405 nm, dryBabs405nm
Relative humidity of the dry measurementsRH_Dry
Relative humidity of the humidified measurementsRH_Wet
Data Quality:
Attribute Accuracy: Instruments were calibrated in the field, and Allan variance tests on filtered air were performed prior to the campaign to assess the estimated precision. We refer potential users to publications that describe the instruments used here, and to the read me file.
Positional Accuracy: No formal positional accuracy tests were conducted
Consistency and Completeness Report: The data from the H-CAPS-SSA are still undergoing quality control. Preliminary data for this instrument can be requested from the Point of Contact.
Factor Affecting the Research: The high relative humidity caused challenges with the operation of the H-CAPS-SSA instrument
Access Restriction: No access constraints are associated with this data.
Use Restrictions: We ask that any users contact the Point of Contact prior to any publication resulting from the use of this data to ensure its proper use
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
Additional Missing Info: A read me file (ReadMe_TRACER_CAT_UCDavis_v1.pdf) is available with additional information