NCSU RDMA 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: Nano-Scanning Mobility Particle (SMPS); A Radial Differential Mobility Analyzer (RDMA) coupled with 1 Condensation Particle Counter Start Date: 2022-06-01 End Date: 2022-9-26 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 NCSU RDMA was operated at a sheath-to-sample flow ratio of 5:1.5 L min−1. The RDMA was configured to scan from 5 to 55 nm. It was located into the temperature-controlled trailer adjacent to the NCSU Flux Tower to observe size distributions of the aerosols. A sample line (¼” conductive tubing) slightly top of the tower, brought aerosol inside the trailer at 2.5 L min-1, where it was distributed between NCSU RDMA (1.5 L min-1) and NCSU HTDMA (1 L min-1) lines. The sample line was dried with three silica-gel driers in series, and then neutralized with X-ray neutralizer. Please contact mdpetter@ncsu.edu for further information." quality assurance and quality control "The raw data from the NCSU RDMA were acquired using a custom data acquisition system that logged time at UTC. Data during general instrument maintenance, data outages during storms, and suspected instrument malfunction, and during HTDMA calibrations are removed. Examples of general instrument maintenance are renewing silica gels in the dryers and HTDMA calibration. A dilute ammonium sulfate particles were used to calibrate the HTDMA, and during the calibration tests, RDMA pulled directly from the trailer/outside without being dried and being neutralized. Example of instrument malfunction is water build up in the RDMA external pump that needs to be replaced. HTDMA calibration test times: "06012022: 21:38-22:37 06022022: 14:08-16:51 06032022: 14:57-15:30 06062022: 13:10-13:30 06072022: 13:11-13:33 06082022: 13:24-13:46 06092022: 13:46-14:09 06102022: 14:32-14:52 06132022: 13:24-13:44 06142022: 13:10-13:30 06152022: 13:02-13:25 06162022: 13:18-13:43 06172022: 14:18-14:38 06202022: 13:19-13:45 06212022: 13:52-14:15 06222022: 13:10-13:33 08232022: 14:19-14:40 06242022: 14:49-15:10 06272022: 13:33-13:54 06282022: 13:12-13:44 06292022: 13:03-13:23 06302022: 13:54-14:15 07012022: 14:36-14:56 07042022: 13:36-14:00 07052022: 13:19-13:42 07062022: 12:16-12:40 07072022: 14:11-14:33 07082022: 14:36-15:06 07112022: 13:21-13:36 07122022: 14:01-14:29 07132022: 13:53-14:27 07152022: 15:15-15:39 07162022: 14:49-15:12 07182022: 13:03-13:23 07192022: 13:18-13:40 07202022: 13:24-13:47 07212022: 13:10-13:30 07222022: 14:40-15:06 07252022: 13:10-13:32 07262022: 13:34-13:56 07292022: 14:47-15:10 07312022: 13:58-14:18 08012022: 14:08-14:22 08022022: 13:13-13:37 08032022: 13:40-14:01 08052022: 14:17-14:37 08082022: 13:59-14:21 08092022: 13:36-14:01 08102022: 13:11-13:39 08112022: 13:34-13:55 08122022: 14:47-15:35 08142022: 21:15-21:41 08152022: 14:48-15:18 08162022: 13:42-14:02 08172022: 13:30-13:51 08182022: 13:28-13:50 08242022: 14:12-14:32 08262022: 15:51-16:19 08292022: 14:30-14:50 08302022: 14:10-14:30 09012022: 13:50-14:11 09032022: 14:34-14:54 09052022: 14:33-14:50 09062022: 14:16-15:01 09072022: 13:59-14:20 09082022: 13:21-13:51 09102022: 13:03-13:32 09132022: 13:43-14:03 09142022: 14:12-14:32 09152022: 13:19-13:39 09182022: 14:12-14:32 09212022: 14:28-15:03 09222022: 14:03-14:27 09262022: 14:41-15:05 Data reduction procedures for RDMA are based on DMA theory; the inversion procedures were applied to the raw data according to Petters 2018*. *Petters, Markus. D. (2018). “A language to simplify computation of differential mobility analyzer response functions,” Aerosol Science and Technology, vol. 52, pp. 1437–1451. variables File ; longname = "The NCSU RDMA data source file names. First three rows of this column includes the Lower bin bounds, Midpoints, Upper bin bounds. They refer to the sizing of the RDMA grid in units of (nm). The fourth block identifies the source file from which the scans were extracted named as YYYMMdd_HHMM.csv." Lower bin bounds:units = "nm" ; Lower bin bounds:longname = Lower bin edges of 23 channels of the RDMA. Lower bin bounds = "3.6132735512445, 4.10391053876533, 4.66158254176918, 5.29556987171024, 6.01647362175653, 6.83641442190474, 7.76926434819303, 8.83091848727732, 10.0396142150367, 11.4163082569194, 12.9851242107737, 14.77388663972, 16.8147623741165, 19.1450357038443, 21.8080522653067, 24.8543774378811, 28.3432301084624, 32.3442733793928, 36.9398725396468, 42.2279707881842, 48.3257897003851, 55.3746413529893, 63.546252561743" Midpoints:units = "nm" ; Midpoints:longname = "Bin midpoints of 23 channels of the RDMA." Midpoints = "3.39051168902003, 3.85074593751452, 4.37381597250915, 4.96840735969328, 5.64443781037753, 6.41324140629907, 7.28778320209085, 8.28291006129358, 9.41564495718427, 10.7055337367591, 12.1750556350689 13.8501118163936, 15.7606101552855, 17.9411696976991, 20.431975241068, 23.2798219198283, 26.5394025401898, 30.2749080448298, 34.5620358684106, 39.4905348956403, 45.1674633376395, 51.7214030003998 59.3079686392672" Upper bin bounds:units = "nm" ; Upper bin bounds:longname = Upper bin edges of 23 channels of the RDMA. Upper bin bounds = "3.18154116428233, 3.6132735512445, 4.10391053876533, 4.66158254176918, 5.29556987171024, 6.01647362175653, 6.83641442190474, 7.76926434819303, 8.83091848727732, 10.0396142150367, 11.4163082569194, 12.9851242107737, 14.77388663972. 16.8147623741165, 19.1450357038443, 21.8080522653067, 24.8543774378811, 28.3432301084624, 32.3442733793928, 36.9398725396468, 42.2279707881842, 48.3257897003851, 55.3746413529893" comment = "Upper bin bounds and Lower bin bounds rows are reversed." timeISO8601 ; longname = "NCSU RDMA time stamp, date time in ISO 8601 standard form, UTC Timestamp since 2022-06-0100:00:00.0" unit = "YYYY-MM-ddHH:MM:SS.s" comment = nothing timeInt64 ; longname = "NCSU RDMA time stamp in milliseconds since epoch as Integer, UTC Timestamp since 2022-06-0100:00:00.0" unit = "milliseconds" comment = nothing RHsh1 ; longname = "Relative humidity of RH sensor of aerosol sample line arrived at RDMA inlet." unit = "%" missing value = "" comment = nothing Tsh1 ; longname = "Temperature of RH sensor of aerosol sample line arrived at RDMA inlet." unit = "degrees Celsius" missing value = "" comment = nothing DMA1 ; longname = "First size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA2 ; longname = "Second size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA3 ; longname = "Third size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA4 ; longname = "Fourth size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA5 ; longname = "Fifth size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA6 ; longname = "Sixth size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA7 ; longname = "Seventh size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA8 ; longname = "Eighth size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA9 ; longname = "Ninth size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA10 ; longname = "Tenth size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA11 ; longname = "Eleventh size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA12 ; longname = "Twelfth size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA13 ; longname = "Thirteenth size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA14 ; longname = "Fourteenth size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA15 ; longname = "Fifteenth channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA16 ; longname = "Sixteenth size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA17 ; longname = "Seventeenth size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA18 ; longname = "Eighteenth size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA19 ; longname = "Nineteenth size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA20 ; longname = "Twentieth size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA21 ; longname = "Twenty-first size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA22 ; longname = "Twenty-second size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD." DMA23 ; longname = "Twenty-third size channel of the RDMA grid" unit = "cm-3" missing value = "" comment = "The concentration is dN/dlnD."