NCSU HTDMA Inverted data and Calibration Data Level b1: QC checks are not applied to inverted files Data Format: CSV Description: See "calibration 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: Humidified Tandem Differential Mobility Analyzer; 2 Differential Mobility Analyzers (DMA1 and DMA2). Start Date: 2022-06-01 End Date: 2022-09-26 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) calibration description "The calibration of the Rotronic RH sensor of the humidified tandem differential mobility analyzer (NCSU HTDMA) was almost daily calibrated with diluted ammonium sulfate particles. The calibration times are given below. During calibration, the NCSU HTDMA system was not sampling. Calibration was performed at least 70% RH. Atomized ammonium sulfate particles (1 L min-1) were routed into silica-gel driers in series and then neutralized with an X-ray neutralizer before entering DMA1 (operated as an electrostatic classifier). Monodisperse particles with certain fractions were humidified with a temperature-controlled Nafion membrane immersed in water before entering DMA2 (operated in scanning mobility particle sizer). The calibration took at least 20 minutes. The observed size of the humidified ammonium sulfate particles by DMA2 was used with Extended Aerosol Inorganic Model (E-AIM) (Clegg and Seinfeld, 2006; Wexler and Clegg, 2022; Clegg, 2007) at measured RH to infer the calibrated RH of the instrument (Suda and Petters, 2013). The model retrieves the calculated RH as a function of growth factor (gf) at specific dry diameters of 15, 20, 30, 40, and 50 nm particles. Growth factors were measured by the ratio of the size distributions retrieved from DMA1 and DMA2. Weekly averaged RH based calibrations are given below for each week.The weekly averaged plots are given in calibrations folder. The folder includes weekly plots of the calibrated RH and their summary files; The weekly plots contains the mean RH calibration and their standard deviations; The weekly summary tabulates the weekly plots including the calibration timestamps, diameter in nm, growth factors, RH calibrated values, and RH measured values. The average calibrated RH for the campaign is 68.9±5.1% where 5.1% is the standard deviation. Whole campaign's RH calibration plot is also provided. The calibrated RH values were used to get kappa by the rearrangement of Equation. 11 in Petters and Kreidenweis (2007). aw = RH / 100.0 / exp(2.1 / (Dd * gf)) kappa = (gf^3.0 - 1.0) * ((aw^-1)-1) where aw is the activity of water, Dd is the dry diameter in nm (15, 20, 30, 40 or 50 nm), gf (-) is the growth factor retrieved from inverted HTDMA files, RH is calibrated weekly mean RH retrieved from HTDMA ammonium sulfate calibrations." HTDMA calibration test times in UTC: "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" weekly averaged RH based on calibration: mean±standard deviation in %: "06012022-06072022: 67.1±1.7 06082022-06142022: 65.6±3.5 06152022-06212022: 68.0±3.0 06222022-06282022: 69.4±2.7 06292022-07052022: 67.2±4.0 07062022-07112022: 68.0±2.4 07132022-07192022: 67.1±3.0 07202022-07262022: 67.2±3.5 07272022-08022022: 67.2±3.6 08032022-08092022: 66.2±1.7 08102022-08162022: 65.1±3.7 08172022-08232022: 70.3±0.3 08242022-08302022: 79.5±5.5 08312022-09062022: 77.8±4.2 09072022-09132022: 76.5±1.6 09142022-09202022: 75.2±4.1 09212022-09272022: 76.0±1.6" Data inversion "Data during general instrument maintenance, data outages during storms, and suspected instrument malfunctions are not removed from inverted HTDMA data. Inverted data was generated for each week according to Tikhonov regularization tool (Petters, 2021). L2 regularization was used to invert the humidified mobility distribution to find the growth factor frequency distribution." variables Column 1 ; longname = "The inverted NCSU HTDMA data source file names. Repetitive in every four rows includes the Lower bin bounds, Midpoints, Upper bin bounds and invertTDMA. Lower bin bounds:units = "-"; Lower bin bounds:longname = Lower bin edges of the inverted growth size distribution. Lower bin bounds = "4.9235007060353, 4.84817798627691, 4.77401374273466, 4.70099015577004, 4.62908967981476, 4.55829503915499, 4.48858922378056, 4.41995548529789, 4.35237733290584, 4.28583852943354, 4.22032308743893, 4.15581526536756, 4.09229956377032, 4.02976072157935, 3.96818371244131, 3.90755374110695, 3.8478562398763, 3.78907686509844, 3.73120149372516, 3.67421621991769, 3.61810735170544, 3.56286140769634, 3.50846511383759, 3.4549054002264, 3.40216939796963, 3.35024443609183, 3.29911803849083, 3.24877792094007, 3.19921198813713, 3.15040833079761, 3.10235522279373, 3.05504111833691, 3.0084546492037, 2.96258462200436, 2.9174200154935, 2.87294997792201, 2.82916382442977, 2.78605103447846, 2.74360124932382, 2.7018042695268, 2.66065005250303, 2.62012871010991, 2.58023050627089, 2.54094585463621, 2.50226531627965, 2.46417959743077, 2.42667954724189, 2.38975615558957, 2.35340055090976, 2.31760399806637, 2.28235789625253, 2.24765377692418, 2.21348330176543, 2.17983826068521, 2.14671056984474, 2.11409226971531, 2.08197552316597, 2.05035261358066, 2.01921594300416, 1.98855803031673, 1.95837150943675, 1.92864912755094, 1.89938374337195, 1.87056832542256, 1.84219595034649, 1.81425980124498, 1.78675316603909, 1.75966943585715, 1.73300210344701, 1.70674476161268, 1.68089110167512, 1.65543491195656, 1.63037007628826, 1.60569057254113, 1.58139047117904, 1.55746393383427, 1.533905211905, 1.51070864517426, 1.48786866045022, 1.46537977022729, 1.44323657136793, 1.42143374380462, 1.39996604926192, 1.37882832999809, 1.35801550756609, 1.33752258159367, 1.31734462858223, 1.29747680072407, 1.27791432473797, 1.25865250072256, 1.23968670102744, 1.22101236914153, 1.20262501859868, 1.18452023189998, 1.16669365945276, 1.14914101852581, 1.13185809222076, 1.11484072845925, 1.09808483898567, 1.08158639838527, 1.06534144311738, 1.04934607056346, 1.03359643808989, 1.01808876212505, 1.00281931725073, 0.987784435307449, 0.972980504513568, 0.958403968597935, 0.944051325945918, 0.929919128758539, 0.916003982224581, 0.902302543705417, 0.888811521932405, 0.875527676216615, 0.862447815670735, 0.849568798442959, 0.836887530962649, 0.82440096719763, 0.812106107922909, 0.800000000000655" Midpoints:units = "-"; Midpoints:longname = Midpoints of the inverted growth size distribution. Midpoints: = "4.96160291943808, 4.88569419206924, 4.81095295484269, 4.73736124948336, 4.66490139391884, 4.59355597803088, 4.52330785947226, 4.45414015954796, 4.38603625915967, 4.31897979481278, 4.25295465468463, 4.18794497475335, 4.1239351349862, 4.06090975558654, 3.99885369329849, 3.93775203776847, 3.87759010796273, 3.81835344863987, 3.76002782687771, 3.70259922865358, 3.64605385547712, 3.59037812107496, 3.53555864812633, 3.48158226504895, 3.42843600283428, 3.37610709193142, 3.32458295917911, 3.27385122478468, 3.22389969934964, 3.17471638094095, 3.12628945220734, 3.07860727753998, 3.03165840027684, 2.98543153995003, 2.93991558957545, 2.8950996129842, 2.85097284219497, 2.80752467482685, 2.76474467155198, 2.72262255358729, 2.68114820022493, 2.6403116464006, 2.60010308029928, 2.56051284099785, 2.52153141614392, 2.48314943967031, 2.44535768954483, 2.4081470855545, 2.37150868712398, 2.33543369116746, 2.29991342997366, 2.26493936912331, 2.2305031054387, 2.19659636496469, 2.16321100098093, 2.13033899204443, 2.09797244006247, 2.06610356839494, 2.03472471998605, 2.00382835552462, 1.97340705163277, 1.94345349908245, 1.91396050103934, 1.88492097133384, 1.85632793275861, 1.82817451539232, 1.80045395494912, 1.7731595911536, 1.74628486614065, 1.71982332287998, 1.69376860362488, 1.6681144483848, 1.64285469342145, 1.61798326976802, 1.59349420177124, 1.56938160565572, 1.54563968811054, 1.52226274489746, 1.4992451594806, 1.47658140167718, 1.45426602632901, 1.43229367199442, 1.41065905966032, 1.38935699147406, 1.36838234949478, 1.34773009446404, 1.32739526459524, 1.3073729743818, 1.28765841342356, 1.26824684527131, 1.24913360628905, 1.23031410453378, 1.2117838186525, 1.19353829679622, 1.17557315555061, 1.15788407888318, 1.14046681710659, 1.12331718585798, 1.10643106509391, 1.08980439810086, 1.0734331905209, 1.05731350939238, 1.04144148220532, 1.02581329597144, 1.01042519630841, 0.995273486538203, 0.980354526799408, 0.965664733173074, 0.951200576822108, 0.936958583143872, 0.922935330935833, 0.909127451574052, 0.895531628204326, 0.882144594945767, 0.868963136106644, 0.855984085412305, 0.843204325244974, 0.830620785895251,0.818230444825142, 0.80603032594243, Upper bin bounds:units = "-"; Upper bin bounds:longname = Upper bin edges of the inverted growth size distribution Upper bin bounds = "5, 4.9235007060353, 4.84817798627691, 4.77401374273466, 4.70099015577004, 4.62908967981476, 4.55829503915499, 4.48858922378056, 4.41995548529789, 4.35237733290584, 4.28583852943354, 4.22032308743893, 4.15581526536756, 4.09229956377032, 4.02976072157935, 3.96818371244131, 3.90755374110695, 3.8478562398763, 3.78907686509844, 3.73120149372516, 3.67421621991769, 3.61810735170544, 3.56286140769634, 3.50846511383759, 3.4549054002264, 3.40216939796963, 3.35024443609183, 3.29911803849083, 3.24877792094007, 3.19921198813713, 3.15040833079761, 3.10235522279373, 3.05504111833691, 3.0084546492037, 2.96258462200436, 2.9174200154935, 2.87294997792201, 2.82916382442977, 2.78605103447846, 2.74360124932382, 2.7018042695268, 2.66065005250303, 2.62012871010991, 2.58023050627089, 2.54094585463621, 2.50226531627965, 2.46417959743077, 2.42667954724189, 2.38975615558957, 2.35340055090976, 2.31760399806637, 2.28235789625253, 2.24765377692418, 2.21348330176543, 2.17983826068521, 2.14671056984474, 2.11409226971531, 2.08197552316597, 2.05035261358066, 2.01921594300416, 1.98855803031673, 1.95837150943675, 1.92864912755094, 1.89938374337195, 1.87056832542256, 1.84219595034649, 1.81425980124498, 1.78675316603909, 1.75966943585715, 1.73300210344701, 1.70674476161268, 1.68089110167512, 1.65543491195656, 1.63037007628826, 1.60569057254113, 1.58139047117904, 1.55746393383427, 1.533905211905, 1.51070864517426, 1.48786866045022, 1.46537977022729, 1.44323657136793, 1.42143374380462, 1.39996604926192, 1.37882832999809, 1.35801550756609, 1.33752258159367, 1.31734462858223, 1.29747680072407, 1.27791432473797, 1.25865250072256, 1.23968670102744, 1.22101236914153, 1.20262501859868, 1.18452023189998, 1.16669365945276, 1.14914101852581, 1.13185809222076, 1.11484072845925, 1.09808483898567, 1.08158639838527, 1.06534144311738, 1.04934607056346, 1.03359643808989, 1.01808876212505, 1.00281931725073, 0.987784435307449, 0.972980504513568, 0.958403968597935, 0.944051325945918, 0.929919128758539, 0.916003982224581, 0.902302543705417, 0.888811521932405, 0.875527676216615, 0.862447815670735, 0.849568798442959, 0.836887530962649, 0.82440096719763, 0.812106107922909" invertTDMA:units = "-"; invertTDMA:longname = "Inverted growth factor frequency distributions." Column 2 ; longname = "Inverted NCSU HTDMA 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 Column 3 ; longname = "Dry diameter scans of NCSU HTDMA." unit = "m" comment = nothing Column 4 ; longname = "Methods used to invert the size distributions; LSQ2, L0DxB, LSQ1, LSQ2 " unit = "" comment = nothing Column 5 ; longname = "Methods used to invert the size distributions; LSQ2, L0DxB, LSQ1, LSQ2 " unit = "" comment = nothing Column 6 ; longname = "Parameters of the used methods in column 5 to invert the size distributios; LSQ2, L0DxB, LSQ1, and LSQ2 " unit = "" comment = nothing Column 7 ; longname = "Results of the models used in Column 5;for LSQ2 first number is the fraction reported in the low hygroscopicity mode, second number is the fraction reported in the high hygroscopicity mode, third number is growth factor of the low hygroscopic mode, fourth number is the growth factor of the high hygroscopic mode." unit = "-" comment = "The kappa values are calculated from LSQ2 method, other methods were not used to interpret kappa." Column 8 through Column 127 ; longname = "The first through one hundred and twentieth size channel of the TDMA grid" unit = "-" comment = "" Clegg, S. L. and Seinfeld, J. H. (2006). "Thermodynamic Models of Aqueous Solutions Containing Inorganic Electrolytes and Dicarboxylic Acids at 298.15 K. 1. The Acids as Nondissociating Components, "J. Phys. Chem. A, 110(17): 5692–5717. Clegg, S. L. (2007). “Interactive comment on “Calibration and measurement uncertainties of a continuous-flow cloud condensation nuclei counter (DMT-CCNC): CCN activation of ammonium sulfate and sodium chloride aerosol particles in theory and experiment” by D. Rose et al.,” Atmos. Chem. Phys. Discuss., vol. 7, pp. S4180–S4183. Petters, M. D. and Kreidenweis, S. M. (2007): "A single parameter representation of hygroscopic growth and cloud condensation nucleus activity, Atmos. Chem. Phys., 7, 1961–1971." Petters, M. D. (2021). "Revisiting matrix-based inversion of scanning mobility particle sizer (SMPS) and humidified tandem differential mobility analyzer (HTDMA) data, Atmos. Meas. Tech., 14, 7909–7928. Suda S. R and Petters, M. D. (2013). “Accurate Determination of Aerosol Activity Coefficients at Relative Humidities up to 99% Using the Hygroscopicity Tandem Differential Mobility Analyzer Technique,” Aerosol Science and Technology, vol. 47, no. 9, pp. 991–1000. Wexler, A. S. and Clegg, S. L. (2002). “Atmospheric aerosol models for systems including the ions H+, NH4+, Na+, SO42-, NO3-, Cl-, Br-, and H2O,” Journal of Geophysical Research: Atmospheres, vol. 107, no. D14, pp. ACH 14–1–ACH 14–14.