NCSU HTDMA data

<strong>NCSU HTDMA data</strong>Data Level b1: QC checks applied to measurements<br>Data Format: CSV<br>Description: See "instrument description<br>Site: Houston, TX; Tracking Aerosol Convection interactions ExpeRiment (HOU)<br>Location: Houston, TX; AMF1 (main site for TRACER)<br>Facility Code: M1<br>Category: Aerosol Properties<br>Data Type: PI Data<br>Source Instrument/Data: Humidified Tandem Differential Mobility Analyzer; 2 Differential Mobility Analyzers (DMA1 and DMA2).<br>Start Date: 2022-06-01<br>End Date: 2022-09-26<br>Contact PI: Markus Petters ([e-mail])<br>Funding Source: DOE ASR award US Department of Energy, Office of Science, Biological and Environment Research (grant no. DE-SC 0021074)<strong>Instrument description</strong>The NCSU HTDMA was operated at a sheath-to-sample flow ratio of 5:1 L min−1. The HTDMA was configured to measure hygroscopic growth factors of dry particles with mobility diameters of D = 15, 20, 30, 40, and 50 nm at RH ~ 70%. A complete cycle for all diameters took ~30 minutes. A sample line 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. The sample line entered DMA1 (operated as an electrostatic classifier). Monodisperse particles with certain fractions were humidified with temperature controlled Nafion membrane immersed in water before entering DMA2 (operated in scanning mobility particle sizer). Please contact [e-mail] for further information.