AMSSD (Aerosol Mass Spectrometer Size Distribution) Data https://data.eol.ucar.edu/dataset/618.015 Summary AMSSD (Aerosol Mass Spectrometer Size Distribution) Data, chemically speciated size-resolved submicron (PM1.5 vacuum aerodynamic) non-refractory particulate mass data collected on board the NSF/NCAR GV HIAPER during the TI3GER (Technological Innovation Into Iodine and GV Environmental Research) field project conducted on the NCAR G-V from 2 through 28 April 2022. This data set is in ICARTT format. Please see the header portion of the data files for details on instruments, parameters, quality assurance, quality control, contact information, and data set comments. Identifiers * Local archive identifier: 618.015 Versions 0.1 1.0 Citation Example citation following ESIP guidelines (http://bit.ly/data_citation): Kim, D, Guo, H, Campuzano-Jost, P and Jimenez, JL. 2022. AMSSD (Aerosol Mass Spectrometer Size Distribution) Data. Version 1.0. UCAR/NCAR - Earth Observing Laboratory. https://data.eol.ucar.edu/dataset/618.015 Accessed 22 Nov 2022. If you plan to cite this dataset in a publication, please email us at: datahelp@eol.ucar.edu We may be able to provide an updated citation that includes a DOI. Acknowledgement In addition to the citation reference and any other acknowledgements, please acknowledge NCAR/EOL in your publications with text such as: Data provided by NCAR/EOL under the sponsorship of the National Science Foundation. https://data.eol.ucar.edu/ Related projects * TI3GER: Technological Innovation Into Iodine and GV Environmental Research https://data.eol.ucar.edu/project/TI3GER Additional information * Spatial Type: point * Frequency: continuous * Language: English Categories * Aircraft * Chemistry Platforms * Aircraft, NSF/NCAR GV HIAPER Instruments * AMS - Aerosol Mass Spectrometer INSTRUMENT_INFO: AMS_PToF_Mode=ePToF; AMS_PToF_SlitWidth=0.78%; AMS_Type=V; Ionization_type=EI; AMS_SamplingTime: 3-5 s for AMSSD; Fast Mode, 6 s closed and 46 s open (reported under a different DataID), 1 min synchronization clock, SD data suppressed during flux legs in order to obtain continuous MS-mode (total PM1.5 concentration) data coverage; AMS_LensType=PM2.5; AMS_LensPressure=3.81 Torr (actively controlled); AMS_FlowRate=Flowrate_AMSSD; AMS_PrsTempFlowCal: 273K, 1 atm; AMS_STPConversionFactor=StdtoVol_AMSSD; AMS_Calibrations: AN single particle IE calibration (ET, 500 nm particles) including ammonium RIE after every flight; sulfate RIE, as well as AN and sulfate size calibrations (75-900 nm) at regular intervals; AMS_FilEmmCurr =1.6 mA (actively controlled); AMS _DAQType = ADQ_1600; AMS_CE: Calculated using the algorithm from Middlebrook et al 2012, AS&T 46, 258–271 [https://doi.org/10.1080/02786826.2011.620041] using 1 min data; AMS_PMCut(D50)= ~1.5 um vacuum aerodynamic, based on in-field and laboratory calibrations; AMS_InletRH=not actively controlled, reported as InletRH_AMSSD based on data from the VCSEL instrument; AMS_PToF_Vgas=750 m/s, AMS_PToF_Vlens=8.65 m/s, AMS_PToF_Dd=9.06 nm, AMS_PToF_b=0.42871; AMS_SquirrelVersion=1.66G; AMS_IEOverAB=7E-13; AMS_RIENH4=3.75; AMS_RIESO4=1.44; AMS_RIEChl=1.73; AMS_RIEClO4=0.52; (based on in-field calibrations), AMS_RIEBr=0.85, AMSRIEI=0.67, AMS_CFMSA=0.148, AMS_CFSeasalt=1/110, AMS_PieberCorr=1.22% (as discussed in Pieber et al 2016, ES&T 50 (19), 10494–10503 [https://doi.org/10.1021/acs.est.6b01035]; AMS_HuCorr=-0.02% (as discussed in Hu et al 2017, AS&T 51 [https://doi.org/DOI:10.1080/02786826.2017.1296104]) DATA_INFO: Only brief explanations are provided here. Please refer to http://tinyurl.com/FAQ-AMS-Data for additional topics and more detailed explanations, and contact the PIs if in doubt. Both that web page and this header are updated regularly in response to questions from data users and/or new information about the instrument and data interpretation. All concentration data are reported under STP (273 K & 1013 mb); use the provided conversion factor to calculate under ambient temperature and pressure. Note that several other definitions of standard conditions are in use by others in the community, and some groups and models report under ambient and not standard conditions-check carefully before comparing!! Data was taken on a 1 min clock, with ~4 s of size segregated measurements preceded by 52 s of total mass measurements (6 s background and 46 s ambient measurements, reported under a different DataId). Time base is corrected for inlet lag (about 0.2 s in the BL, 0.5 s in the stratosphere). Latitude, Longitude and GPS Altitude are provided (inlet lag adjusted) from the instruments' own GPS datafeed. Size segregated data (PToF in AMS parlance) is taken by recording the fraction of mass evaporating quickly (<0.5 ms at 600 C) in the AMS as a function of size. A variable fraction of the aerosol mass is not captured in this way, and is corrected by normalizing the size distribution to the total mass. Total mass is derived by reanalyzing this data in bulk as a regular AMS difference measurement, and hence intensive properties can be derived for the bulk of PM1.5 taken in SD mode in this way. Those data are reported now under the standard AMS ID, while here we only include the bulk PM1 and OA density, which can be used to convert this data to volume for comparison to particle sizers. All diameters are given as vacuum aerodynamic diameter Dva (deCarlo et al 2004, AS&T 38, 1185-1205 [https://doi.org/10.1080/027868290903907]) and calibrated in the field with ammonium nitrate and PSL particles of known diameter. For spherical particles, Dva=Density*Dgeo (geometric diameter). The inlet transmission of the CU AMS is characterized routinely in the field and available upon request, and should always be taken into account when performing comparisons with other aerosol sensors (see Guo et al, 2021, AMT 14,3631–3655 [https://doi.org/10.5194/amt-14-3631-2021]). Note that the AMS inlet transmission is less than 1 below ~70 and above ~1000 nm Dva, and that these data are NOT transmission corrected. Also note that slower evaporation of a fraction of the particles often contributes to a tail in the size distribution nominally above PM1.5 (Cross et al 2009, ACP 9, 7769-7793 [https://doi.org/10.5194/acp-9-7769-2009]). Hence any mass reported here above ~2000 nm is actually from slow evaporating particles of smaller sizes. Size segregated data are currently analyzed at unit mass resolution, which is noisier and more uncertain than HR data (Pika in AMS parlance), which is used to derive the total signal. Size bin MidPoints in nm are reported as a special comment (Line 240) UNCERTAINTY: Accuracy estimate (2 sdev) for the total mass measurement: Inorganics +/-34%, Organics +/-38%, dominated by uncertainty in particle collection efficiency due to particle bounce, and absolute and relative ionization efficiency, as estimated in Bahreini et al. 2009, JGR 114, D00F16 (Supp. Info.)[https://doi.org/10.1029/2008JD011493]. Nominal size resolution per calibrations is about 7.5 (Dva/FWHM) at 300 nm. GCMD Science Keywords * EARTH SCIENCE > ATMOSPHERE > AEROSOLS > ORGANIC PARTICLES * EARTH SCIENCE > ATMOSPHERE > AEROSOLS > NITRATE PARTICLES * EARTH SCIENCE > ATMOSPHERE > AEROSOLS > SULFATE PARTICLES * EARTH SCIENCE > ATMOSPHERE > AEROSOLS > PARTICULATE MATTER * EARTH SCIENCE> ATMOSPHERE > AEROSOLS> CHEMICAL COMPOSITION> NON-REFRACTORY AEROSOL ORGANIC MASS * EARTH SCIENCE> ATMOSPHERE > AIR QUALITY> PARTICULATES Temporal coverage * Begin datetime: 2022-04-02 00:00:00 * End datetime: 2022-04-28 23:59:59 Spatial coverage * Maximum (North) Latitude: 61.00 * Minimum (South) Latitude: 3.00 * Minimum (West) Longitude: -160.00 * Maximum (East) Longitude: -101.00 Primary contact information * pointOfContact: EOL Data Support https://data.eol.ucar.edu/contact/show/1 Additional contact information * author: Jose Luis Jimenez https://data.eol.ucar.edu/contact/show/1364 Alternate metadata formats * DataCite: https://data.eol.ucar.edu/dataset/618.015?format=datacite * ISO/TC 211: https://data.eol.ucar.edu/dataset/618.015?format=isotc211