TITLE:
Aerosol Time-of-Flight Mass Spectrometer (ATOFMS) data during the ICE-T field Campaign

AUTHOR(S): 
Kimberly Prather
   email: kprather AT ucsd DOT edu
   Phone: (858) 822-5312
Alberto Cazorla
   email: cazorla AT ucsd DOT edu
   Phone: (858) 534-7430
Kaitlyn Suski
   email: ksuski AT ucsd DOT edu
   Phone: (858) 822-5745

Dept. of Chemistry & Biochemistry. 9500 Gilman Drive, M/C 0314. La Jolla, CA 92093-0314
http://atofms.ucsd.edu


1.0 DATA SET OVERVIEW:
Please note this is preliminary data.
This dataset contains temporals of single particle chemistry measured by the Aerosol Time-of-Flight Mass Spectrometer (ATOFMS) during the ICE-T field campaign.
This is preliminary data collected for the period of the Ice in Clouds Experiment - Tropical (ICE-T) project: July 1st to July 31st 2011.
The ATOFMS was onboard the NSF/NCAR C-130, based on Saint Croix (US Virgin Islands) and performed flight with a spatial coverage of:
latitude:  -10.00 to 40.00
longitude: -90.00 to -40.00


2.0 INSTRUMENT DESCRIPTION:
The Aerosol Time-Of-Flight Mass Spectrometer (ATOFMS) detects both positive and negative ions simultaneously generating a spectrum from individual particles, providing an increased understanding of particle chemistry and mixing state (Gard et al., 1997). The aircraft version used during ICE-T, the A-ATOFMS (Pratt et al., 2009) can detect particles in the size range of 0.4 to 2.5 microns. Spectra are grouped into clusters using the ART2-a algorithm (Song et al, 1999) and those cluster are classified manually based on their chemical composition. If needed, the single particle spectra can be inspected for further detail.


3.0 DATA COLLECTION AND PROCESSING:
Data contain aerosol particles chemistry and cloud condensation nuclei/ice nuclei chemistry depending of the sampling inlet. Particles were collected from the Wyoming Inlet when the C130 was outside clouds and from the CVI when when the aicraft was in clouds. A flag for the inlet is not included in this preliminary version of the data.
Temporals are 1 minute resolution, and the records indicate the number of particles of a given type (column name) detected during that minute.


4.0 DATA FORMAT:
Data is available in ASCII files with comma delimited values. All files contain a header. File names are ATOFMS_ICET_RFXX where XX is the research flight: 01 - 13.
Headers contain several fields separated by line including REMARKS where the data columns are described. Then the data record column names, the data record units and the records. Excluding the first fields, the data records starts as follow:

DATE/TIME, SS, SS-Bio, BB, K_ECOC, K_EC, ECOC, EC, NoPos, ECOC_Salt, OC, V
UTC, NUMBER, NUMBER, NUMBER, NUMBER, NUMBER, NUMBER, NUMBER, NUMBER, NUMBER, NUMBER, NUMBER
20110701152500.00,0,0,0,0,0,0,0,1,0,0,0

Time is in the format: YYYYMMDDHHmmss.ss

Note that in this preliminary version, RF01 and RF02 have different columns (i.e. different types) than the rest of RFs (04-13):
RF01 and RF02 columns: DATE/TIME, SS, SS-Bio, BB, K_ECOC, K_EC, ECOC, EC, NoPos, ECOC_Salt, OC, V
RF04 - RF13 columns: DATE/TIME, SS, SS_DUST, K_ECOC, Sulf, ECOC, EC, K_EC, NoPos_Salt, K_Salt, BB, ECOC_Salt, NoPos_Mg, OC, CN, V
(see file headers for a description of the types)


5.0 DATA REMARKS:
This is preliminary data. Please contact any of the authors mentioned above with questions about the data and if you intend to use the data in any form of publication.
RF03 data is missing.


6.0 REFERENCES:
Gard, E., Mayer, J. E., Morrical, B. D., Dienes, T., Fergenson, D. P., Prather, K. A. Anal. Chem. 1997, 69, 4083–4091
Pratt, K.A., Mayer, J.E., Holecek, J.C., Moffet, R.C., Sanchez, R.O., Rebotier, T.P., Furutani, H., Gonin, M., Fuhrer, K., Su, Y., Guazzotti, S., Prather, K. Development and characterization of an aircraft aerosol time-of-flight mass spectrometer, Anal. Chem. 2009, 81, 1792–1800
Song, X. H., Hopke, P. K., Fergenson, D. P., Prather, K. A. Classification of single particles analyzed by ATOFMS using an artificial neural network, ART-2A, Anal. Chem. 1999, 71(4), 860–865