#HEADER# PROJECT=NEAQS2002 PLATFORM=RONALD_H_BROWN FILE_START_TIME=2002 07 13 20 42 FILE_STOP_TIME=2002 08 07 12 59 DATA_TYPE=TIMESERIES-1D VERSION=1 SUBMIT_DATE=05-JUN-2003 SOURCE=Trish Quinn, Patricia.K.Quinn@noaa.gov #REMARKS# NOAA PMEL Gravimetrically-determined Mass - collected with 2 stage impactors Contact person: Trish Quinn, quinn@pmel.noaa.gov Two-stage multi-jet cascade impactors (Berner et al., 1979) sampling air at 55 +/- 5% RH were used to determine sub- and supermicron aerosol mass concentrations. The RH of the sampled air stream was measured a few inches upstream from the impactor. The 50% aerodynamic cutoff diameters, D50,aero, were 1.1 and 10 um. Submicron refers to particles with Daero < 1.1 um at 55% RH and supermicron refers to particles with 1.1 um < Daero < 10 um at 55% RH. The impaction stage at the inlet of the impactor was coated with silicone grease to prevent the bounce of larger particles onto the downstream stages. Tedlar films were used as the collection substrate in the impaction stage and a Millipore Fluoropore filter (1.0-um pore size) was used for the backup filter. Films were cleaned in an ultrasonic bath in 10% H2O2 for 30 min, rinsed in distilled, deionized water, and dried in an NH3- and SO2-free glove box. Films and filters were weighed at PMEL with a Cahn Model 29 and Mettler UMT2 microbalance, respectively. The balances are housed in a glove box kept at a humidity of 33 +/- 2%. The resulting mass concentrations from the gravimetric analysis include the water mass that is associated with the aerosol at 33% RH. The glove box was continually purged with room air that had passed through a scrubber of activated charcoal, potassium carbonate, and citric acid to remove gas phase organics, acids, and ammonia. Static charging, which can result in balance instabilities, was minimized by coating the walls of the glove box with a static dissipative polymer (Tech Spray, Inc.), placing an anti-static mat on the glove box floor, using anti-static gloves while handling the substrates, and exposing the substrates to a 210Po source to dissipate any charge that had built up on the substrates. Before and after sample collection, substrates were stored double-bagged with the outer bag containing citric acid to prevent absorption of gas phase ammonia. More details of the weighing procedure can be found in Quinn and Coffman [1998]. Concentrations are reported as ug/m3 at STP (25C and 1 atm). Berner et al., Sci. Total Environ., 13, 245 - 261, 1979. Quinn et al., J. Geophys. Res., 105, 6785 - 6805, 2000. #TIME PARAMETERS# year month day hour minute #PARAMETER# Duration minutes * 0 59 -999 628 #PARAMETER# DayOfYear DecimalDay * 1 365.9999 -999 627 #PARAMETER# LAT Deg GPS -90 90 -999 500 #PARAMETER# LONGT Deg GPS -180 360 -999 502 #PARAMETER# subMass ug/m3 2-stage impactor -- gravimetric analysis 0 250 -999 1965 #PARAMETER# supMass ug/m3 2-stage impactor -- gravimetric analysis 0 250 -999 1966 #DATA 2 HEADINGS# Y M D HR Min Dur DayOfYear LAT LONGT subMass supMass Y M D HR Min Min DecimalDay Deg Deg ug/m3 ug/m3 2002 7 13 20 42 1203 195.2807 37.008 -73.93 4.324 15.400 2002 7 15 2 18 432 196.2459 40.19 -73.239 5.929 6.290 2002 7 15 12 48 310 196.6414 40.492 -73.875 19.291 8.051 2002 7 15 19 9 328 196.9119 40.495 -73.876 40.209 14.353 2002 7 16 11 7 305 197.5692 40.211 -73.404 15.493 5.553 2002 7 16 17 59 227 197.8285 40.317 -73.825 9.588 4.889 2002 7 17 0 38 563 198.2225 40.38 -71.842 6.843 4.750 2002 7 17 10 55 306 198.5612 40.423 -69.594 5.764 2.843 2002 7 17 17 5 360 198.8376 41.437 -69.387 7.412 6.770 2002 7 18 0 0 509 199.1768 42.442 -70.874 15.145 7.350 2002 7 18 10 53 192 199.5201 42.332 -70.713 22.584 9.705 2002 7 18 14 47 207 199.6880 42.354 -70.801 34.998 12.342 2002 7 18 18 54 356 199.9109 42.434 -70.822 34.777 8.444 2002 7 19 2 8 432 200.2389 42.359 -70.807 32.424 21.720 2002 7 20 10 7 236 201.5034 42.947 -70.724 12.018 5.279 2002 7 20 14 52 273 201.7147 42.956 -70.716 10.968 3.440 2002 7 21 10 36 341 202.5608 42.935 -70.53 11.853 6.510 2002 7 21 17 18 343 202.8404 42.906 -70.647 16.019 13.608 2002 7 22 1 28 642 203.2845 42.877 -70.661 8.497 10.844 2002 7 22 13 56 538 203.7680 42.822 -70.629 32.197 11.601 2002 7 23 1 50 642 204.2994 42.869 -70.401 24.132 12.977 2002 7 23 13 28 389 204.6965 42.813 -70.717 50.042 11.275 2002 7 24 10 35 876 205.7451 43.791 -69.349 3.642 2.854 2002 7 25 11 33 616 206.6957 42.991 -70.479 7.008 3.536 2002 7 30 0 7 725 211.2569 42.522 -70.681 15.236 3.242 2002 7 30 13 25 168 211.6175 42.25 -70.364 41.425 5.047 2002 7 30 17 22 242 211.8077 42.304 -70.692 15.211 6.011 2002 7 30 22 23 729 212.1861 42.418 -70.664 9.319 3.098 2002 7 31 11 13 314 212.5770 42.506 -70.703 13.931 4.382 2002 7 31 17 49 247 212.8281 42.32 -70.789 19.662 2.873 2002 8 1 11 5 299 213.5661 42.995 -70.655 14.076 5.940 2002 8 1 17 13 265 213.8095 42.983 -70.688 11.444 6.740 2002 8 1 22 56 1186 214.3674 42.84 -70.492 6.625 7.671 2002 8 2 23 17 671 215.2032 42.884 -70.548 7.467 5.023 2002 8 3 11 8 340 215.5820 42.95 -70.719 15.571 5.851 2002 8 3 17 42 424 215.8849 42.947 -70.589 20.318 5.482 2002 8 4 2 16 459 216.2538 42.656 -69.859 25.517 3.987 2002 8 4 11 11 500 216.6403 42.923 -70.676 25.066 7.333 2002 8 4 21 46 758 217.1707 42.844 -70.725 25.129 8.340 2002 8 5 11 10 480 217.6326 42.814 -70.64 47.802 8.375 2002 8 5 20 30 372 217.9835 42.809 -70.663 40.367 7.491 2002 8 7 3 48 505 219.3343 40.048 -69.868 2.460 15.654 2002 8 7 12 59 420 219.6868 39.336 -72.087 2.920 8.188